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class="ng nh fj ni bh nj"><div class="mx my mz"><picture><source srcSet="https://miro.medium.com/v2/resize:fit:640/format:webp/1*hVKWuT24riZnx4VzDpQVJQ.png 640w, https://miro.medium.com/v2/resize:fit:720/format:webp/1*hVKWuT24riZnx4VzDpQVJQ.png 720w, https://miro.medium.com/v2/resize:fit:750/format:webp/1*hVKWuT24riZnx4VzDpQVJQ.png 750w, https://miro.medium.com/v2/resize:fit:786/format:webp/1*hVKWuT24riZnx4VzDpQVJQ.png 786w, https://miro.medium.com/v2/resize:fit:828/format:webp/1*hVKWuT24riZnx4VzDpQVJQ.png 828w, https://miro.medium.com/v2/resize:fit:1100/format:webp/1*hVKWuT24riZnx4VzDpQVJQ.png 1100w, https://miro.medium.com/v2/resize:fit:1400/format:webp/1*hVKWuT24riZnx4VzDpQVJQ.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px" type="image/webp"/><source data-testid="og" srcSet="https://miro.medium.com/v2/resize:fit:640/1*hVKWuT24riZnx4VzDpQVJQ.png 640w, https://miro.medium.com/v2/resize:fit:720/1*hVKWuT24riZnx4VzDpQVJQ.png 720w, https://miro.medium.com/v2/resize:fit:750/1*hVKWuT24riZnx4VzDpQVJQ.png 750w, https://miro.medium.com/v2/resize:fit:786/1*hVKWuT24riZnx4VzDpQVJQ.png 786w, https://miro.medium.com/v2/resize:fit:828/1*hVKWuT24riZnx4VzDpQVJQ.png 828w, https://miro.medium.com/v2/resize:fit:1100/1*hVKWuT24riZnx4VzDpQVJQ.png 1100w, https://miro.medium.com/v2/resize:fit:1400/1*hVKWuT24riZnx4VzDpQVJQ.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px"/><img alt="" class="bh me nk c" width="700" height="341" loading="eager" role="presentation"/></picture></div></div><figcaption class="nl ff nm mx my nn no bf b bg z du">Koined from original banner — <a class="af np" href="https://github.com/android/nowinandroid" rel="noopener ugc nofollow" target="_blank">https://github.com/android/nowinandroid</a></figcaption></figure><p id="7a78" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk"><a class="af np" href="https://github.com/android/nowinandroid" rel="noopener ugc nofollow" target="_blank">Now In Android</a> is an open-source Android application that covers Modern Android Development best practices. The project is maintained by the Google Android team.</p><p id="03be" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">I propose to continue our tour with the <strong class="ns gv">version</strong> <strong class="ns gv">built with the Koin dependency injection framework</strong>. This is a good time to refresh practices, from standard components structure to more advanced cases.</p><p id="cbb5" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">For this article, <strong class="ns gv">I propose now to use Koin Annotations instead of Koin DSL to configure all the app’s components injection. </strong>This is interesting to see how much it can improve the experience in terms of writing.</p><p id="0c3d" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">Prepare yourself, we have many things to see together 👍 🚀</p><blockquote class="oo op oq"><p id="8973" class="nq nr or ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">This version uses Koin Annotations 1.2</p></blockquote></div></div></div><div class="ab cb os ot ou ov" role="separator"><span class="ow by bm ox oy oz"></span><span class="ow by bm ox oy oz"></span><span class="ow by bm ox oy"></span></div><div class="gn go gp gq gr"><div class="ab cb"><div class="ci bh fz ga gb gc"><p id="46e2" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">This article series covers several parts:</p><p id="940d" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk"><a class="af np" rel="noopener ugc nofollow" target="_blank" href="/now-in-android-with-koin-part-1-2b871d8549f1">Part 1 — Koin setup, application verification, and a first module tour</a></p><p id="2a90" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk"><a class="af np" rel="noopener ugc nofollow" target="_blank" href="/now-in-android-with-koin-part-2-49158741cb92#1936-6cf6d648e2ac-reply">Part 2 — Common Modules components and feature modules</a></p><p id="bb38" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk"><a class="af np" rel="noopener ugc nofollow" target="_blank" href="/now-in-android-with-koin-part-3-2801ffeed4d6">Part 3 — Get started with Koin Annotations</a></p><p id="0f58" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk"><a class="af np" rel="noopener ugc nofollow" target="_blank" href="/now-in-android-with-koin-part-4-fbdc855824ad"><strong class="ns gv">Part 4 — Core & Features Components with Koin Annotations</strong></a></p><p id="eea4" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">… more to come :)</p><figure class="pb pc pd pe pf nf mx my paragraph-image"><div class="mx my pa"><picture><source srcSet="https://miro.medium.com/v2/resize:fit:640/format:webp/0*SgUInfHiU6tfX3-c.png 640w, https://miro.medium.com/v2/resize:fit:720/format:webp/0*SgUInfHiU6tfX3-c.png 720w, https://miro.medium.com/v2/resize:fit:750/format:webp/0*SgUInfHiU6tfX3-c.png 750w, https://miro.medium.com/v2/resize:fit:786/format:webp/0*SgUInfHiU6tfX3-c.png 786w, https://miro.medium.com/v2/resize:fit:828/format:webp/0*SgUInfHiU6tfX3-c.png 828w, https://miro.medium.com/v2/resize:fit:1100/format:webp/0*SgUInfHiU6tfX3-c.png 1100w, https://miro.medium.com/v2/resize:fit:1400/format:webp/0*SgUInfHiU6tfX3-c.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px" type="image/webp"/><source data-testid="og" srcSet="https://miro.medium.com/v2/resize:fit:640/0*SgUInfHiU6tfX3-c.png 640w, https://miro.medium.com/v2/resize:fit:720/0*SgUInfHiU6tfX3-c.png 720w, https://miro.medium.com/v2/resize:fit:750/0*SgUInfHiU6tfX3-c.png 750w, https://miro.medium.com/v2/resize:fit:786/0*SgUInfHiU6tfX3-c.png 786w, https://miro.medium.com/v2/resize:fit:828/0*SgUInfHiU6tfX3-c.png 828w, https://miro.medium.com/v2/resize:fit:1100/0*SgUInfHiU6tfX3-c.png 1100w, https://miro.medium.com/v2/resize:fit:1400/0*SgUInfHiU6tfX3-c.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px"/><img alt="" class="bh me nk c" width="700" height="393" loading="eager" role="presentation"/></picture></div></figure><p id="5aa3" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">Features picture from <a class="af np" href="https://github.com/android/nowinandroid" rel="noopener ugc nofollow" target="_blank">https://github.com/android/nowinandroid</a></p></div></div></div><div class="ab cb os ot ou ov" role="separator"><span class="ow by bm ox oy oz"></span><span class="ow by bm ox oy oz"></span><span class="ow by bm ox oy"></span></div><div class="gn go gp gq gr"><div class="ab cb"><div class="ci bh fz ga gb gc"><p id="766e" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">Previously in part 3, we saw how to setup and use Koin annotations with Koin dependency injection framework. It’s really easy as the Koin annotation processor can detect many cases, and generate your dependency injection configuration really quickly. It’s now time to dive into more components of the NowInAndroid project.</p><p id="019b" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">You will have the reference for all the content to browse the code. Also, everything is available online on the Github repo: <a class="af np" href="https://github.com/InsertKoinIO/nowinandroid/tree/refacto_koin/annotations" rel="noopener ugc nofollow" target="_blank">https://github.com/InsertKoinIO/nowinandroid/</a></p><h1 id="1b53" class="pg ph gu bf pi pj pk pl pm pn po pp pq pr ps pt pu pv pw px py pz qa qb qc qd bk">Common Data Layers</h1><p id="7fed" class="pw-post-body-paragraph nq nr gu ns b nt qe nv nw nx qf nz oa ob qg od oe of qh oh oi oj qi ol om on gn bk">Following the <a class="af np" rel="noopener ugc nofollow" target="_blank" href="/now-in-android-with-koin-part-2-49158741cb92#1936-6cf6d648e2ac-reply">part 2 article</a>, we will now go through the common core components that will be used by the features later. But this time, the configuration will be done with annotations.</p><p id="c7a5" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">As a reminder, the Nia app is developed using Jetpack Compose and uses repository & use-case components:</p><ul class=""><li id="1ace" class="nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on qj qk ql bk">Repository to access data (network, database …)</li><li id="55d5" class="nq nr gu ns b nt qm nv nw nx qn nz oa ob qo od oe of qp oh oi oj qq ol om on qj qk ql bk">Usecase to handle business logic</li></ul><p id="9c6e" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">The module that is gathering all those common components is the<code class="cx qr qs qt qu b"><a class="af np" href="https://github.com/InsertKoinIO/nowinandroid/blob/refacto_koin/annotations/core/data/src/main/java/com/google/samples/apps/nowinandroid/core/data/di/DataKoinModule.kt#L48" rel="noopener ugc nofollow" target="_blank">DataKoinModule.kt</a></code> module:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="155b" class="qy ph gu qu b bg qz ra l rb rc">@Module(includes = [DaosKoinModule::class, DataStoreKoinModule::class, NetworkKoinModule::class, DispatchersKoinModule::class, DataUtilModule::class])<br/>@ComponentScan("com.google.samples.apps.nowinandroid.core.data.repository")<br/>class DataKoinModule</span></pre><p id="d29d" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">This module is making several things:</p><ul class=""><li id="2810" class="nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on qj qk ql bk">scans all repository classes defined in <code class="cx qr qs qt qu b">@ComponentScan</code></li><li id="90f6" class="nq nr gu ns b nt qm nv nw nx qn nz oa ob qo od oe of qp oh oi oj qq ol om on qj qk ql bk">includes modules that are declaring sub-data layers components</li></ul><p id="5c9d" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">Each repository class is simply tagged with <code class="cx qr qs qt qu b">@Single</code> annotation like this:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="219a" class="qy ph gu qu b bg qz ra l rb rc">@Single<br/>class OfflineFirstAuthorsRepository(<br/> private val authorDao: AuthorDao,<br/> private val network: NiaNetworkDataSource,<br/>)</span></pre><p id="45d5" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">You can find all the repository classes in <a class="af np" href="https://github.com/InsertKoinIO/nowinandroid/tree/refacto_koin/annotations/core/data/src/main/java/com/google/samples/apps/nowinandroid/core/data/repository" rel="noopener ugc nofollow" target="_blank">the source code data package</a>.</p><h1 id="b470" class="pg ph gu bf pi pj pk pl pm pn po pp pq pr ps pt pu pv pw px py pz qa qb qc qd bk">Database Storage</h1><p id="e15b" class="pw-post-body-paragraph nq nr gu ns b nt qe nv nw nx qf nz oa ob qg od oe of qh oh oi oj qi ol om on gn bk">For the database storage layer, we need to declare our Room database instance via a function using the Room API builder like this:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="8846" class="qy ph gu qu b bg qz ra l rb rc">@Module<br/>class DatabaseKoinModule {<br/><br/> @Single<br/> fun database(context: Context) =<br/> Room.databaseBuilder(context, NiaDatabase::class.java, "nia-database")<br/> .build()<br/>}</span></pre><p id="28db" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">The <code class="cx qr qs qt qu b">context</code> parameter here is the Android Context instance from Koin.</p><p id="a368" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">In a second module, we can reuse our <code class="cx qr qs qt qu b">NiaDatabase</code> instance below in DAOs:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="7424" class="qy ph gu qu b bg qz ra l rb rc">@Module(includes = [DatabaseKoinModule::class])<br/>class DaosKoinModule {<br/><br/> @Single<br/> fun authorDao(niaDatabase: NiaDatabase) = niaDatabase.authorDao()<br/><br/> @Single<br/> fun topicDao(niaDatabase: NiaDatabase) = niaDatabase.topicDao()<br/><br/> @Single<br/> fun newsResourcesDao(niaDatabase: NiaDatabase) = niaDatabase.newsResourceDao()<br/>}</span></pre><p id="ba81" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">That’s it! Our Database Layer is ready to be injected.</p><h1 id="616d" class="pg ph gu bf pi pj pk pl pm pn po pp pq pr ps pt pu pv pw px py pz qa qb qc qd bk">Datasource Components — Datastore & Networking</h1><p id="b769" class="pw-post-body-paragraph nq nr gu ns b nt qe nv nw nx qf nz oa ob qg od oe of qh oh oi oj qi ol om on gn bk">This layer defines Datasources which are components that abstract the calls to different sources of data. E.g: remote web service, local data storage, and so on. Therefore, the UI doesn’t need to know where the data comes from. It just calls the interface defined here.</p><p id="158d" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">We are defining severasl kind of usages with <code class="cx qr qs qt qu b">NiaNetworkDatasource</code>:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="5d0c" class="qy ph gu qu b bg qz ra l rb rc">interface NiaNetworkDataSource {<br/> suspend fun getTopics(ids: List<String>? = null): List<NetworkTopic><br/><br/> suspend fun getAuthors(ids: List<String>? = null): List<NetworkAuthor><br/><br/> suspend fun getNewsResources(ids: List<String>? = null): List<NetworkNewsResource><br/><br/> suspend fun getTopicChangeList(after: Int? = null): List<NetworkChangeList><br/><br/> suspend fun getAuthorChangeList(after: Int? = null): List<NetworkChangeList><br/><br/> suspend fun getNewsResourceChangeList(after: Int? = null): List<NetworkChangeList><br/>}</span></pre><p id="085b" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">First, we need to declare a default Coroutine dispatcher directly in a module:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="23d3" class="qy ph gu qu b bg qz ra l rb rc">@Module<br/>class DispatchersKoinModule{<br/> <br/> @Single<br/> fun dispatcher() = Dispatchers.IO<br/>}</span></pre><blockquote class="oo op oq"><p id="7c43" class="nq nr or ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">In<!-- --> a test environment, you simply have to redefine a <code class="cx qr qs qt qu b">CoroutineDispatcher</code> type to specify your needed one. Just add the new definition and it will override the existing one.</p></blockquote><p id="71a4" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">The <a class="af np" href="https://github.com/InsertKoinIO/nowinandroid/tree/refacto_koin/annotations/core/network/src" rel="noopener ugc nofollow" target="_blank">network module</a> is declaring <code class="cx qr qs qt qu b">NiaNetworkDatasource</code>, and is organized into 2 flavors:</p><ul class=""><li id="a6b8" class="nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on qj qk ql bk">demo — with local data</li><li id="9b7f" class="nq nr gu ns b nt qm nv nw nx qn nz oa ob qo od oe of qp oh oi oj qq ol om on qj qk ql bk">prod — for online data</li></ul><p id="03b4" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">The <code class="cx qr qs qt qu b">NetworkKoinModule</code> includes the right flavour implementation:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="28d4" class="qy ph gu qu b bg qz ra l rb rc">@Module(includes = [FlavoredNetworkKoinModule::class])<br/>class NetworkKoinModule {<br/><br/> @Single<br/> fun json() = Json { ignoreUnknownKeys = true }<br/>}</span></pre><figure class="pb pc pd pe pf nf mx my paragraph-image"><div role="button" tabindex="0" class="ng nh fj ni bh nj"><div class="mx my rd"><picture><source srcSet="https://miro.medium.com/v2/resize:fit:640/format:webp/1*ZV6ZXgkeUT3JSQqFfOYLxw.png 640w, https://miro.medium.com/v2/resize:fit:720/format:webp/1*ZV6ZXgkeUT3JSQqFfOYLxw.png 720w, https://miro.medium.com/v2/resize:fit:750/format:webp/1*ZV6ZXgkeUT3JSQqFfOYLxw.png 750w, https://miro.medium.com/v2/resize:fit:786/format:webp/1*ZV6ZXgkeUT3JSQqFfOYLxw.png 786w, https://miro.medium.com/v2/resize:fit:828/format:webp/1*ZV6ZXgkeUT3JSQqFfOYLxw.png 828w, https://miro.medium.com/v2/resize:fit:1100/format:webp/1*ZV6ZXgkeUT3JSQqFfOYLxw.png 1100w, https://miro.medium.com/v2/resize:fit:1400/format:webp/1*ZV6ZXgkeUT3JSQqFfOYLxw.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px" type="image/webp"/><source data-testid="og" srcSet="https://miro.medium.com/v2/resize:fit:640/1*ZV6ZXgkeUT3JSQqFfOYLxw.png 640w, https://miro.medium.com/v2/resize:fit:720/1*ZV6ZXgkeUT3JSQqFfOYLxw.png 720w, https://miro.medium.com/v2/resize:fit:750/1*ZV6ZXgkeUT3JSQqFfOYLxw.png 750w, https://miro.medium.com/v2/resize:fit:786/1*ZV6ZXgkeUT3JSQqFfOYLxw.png 786w, https://miro.medium.com/v2/resize:fit:828/1*ZV6ZXgkeUT3JSQqFfOYLxw.png 828w, https://miro.medium.com/v2/resize:fit:1100/1*ZV6ZXgkeUT3JSQqFfOYLxw.png 1100w, https://miro.medium.com/v2/resize:fit:1400/1*ZV6ZXgkeUT3JSQqFfOYLxw.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px"/><img alt="" class="bh me nk c" width="700" height="412" loading="lazy" role="presentation"/></picture></div></div><figcaption class="nl ff nm mx my nn no bf b bg z du">Demo flavor in Network module</figcaption></figure><p id="5b74" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">The demo flavour uses Datastore API and Protobuff API is used to store local data to display as an offline-first architecture.</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="99da" class="qy ph gu qu b bg qz ra l rb rc">@Module(includes = [DispatchersKoinModule::class])<br/>@ComponentScan("com.google.samples.apps.nowinandroid.core.network.fake")<br/>class FlavoredNetworkKoinModule{<br/><br/> @Single<br/> fun assetManager(context: Context) = FakeAssetManager(context.assets::open)<br/>}</span></pre><p id="2771" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">Below is the demo datasource implementation declared as a singleton:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="2466" class="qy ph gu qu b bg qz ra l rb rc">@Single<br/>class FakeNiaNetworkDataSource(<br/> private val ioDispatcher: CoroutineDispatcher,<br/> private val networkJson: Json,<br/> private val assets: FakeAssetManager = JvmUnitTestFakeAssetManager,<br/>) : NiaNetworkDataSource</span></pre><p id="10bf" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">The online version is declared with the following module:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="5e8d" class="qy ph gu qu b bg qz ra l rb rc">@Module(includes = [DispatchersKoinModule::class])<br/>@ComponentScan("com.google.samples.apps.nowinandroid.core.network.retrofit")<br/>class FlavoredNetworkKoinModule</span></pre><p id="1f33" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">This module will scan the Retrofit implementation:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="bea2" class="qy ph gu qu b bg qz ra l rb rc">@Single<br/>class RetrofitNiaNetwork(<br/> networkJson: Json<br/>) : NiaNetworkDataSource</span></pre><p id="e54d" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">One last part is about Datastore persistence API, used to declare local data storage. Check the <a class="af np" href="https://github.com/InsertKoinIO/nowinandroid/blob/refacto_koin/annotations/core/data/src/main/java/com/google/samples/apps/nowinandroid/core/data/di/DataStoreKoinModule.kt" rel="noopener ugc nofollow" target="_blank">Datastore Persistence Module</a> that is declaring the required components for <code class="cx qr qs qt qu b">NiaPreferencesDatasource</code>.</p><h1 id="d3b3" class="pg ph gu bf pi pj pk pl pm pn po pp pq pr ps pt pu pv pw px py pz qa qb qc qd bk">Domain & Features Modules</h1><p id="a286" class="pw-post-body-paragraph nq nr gu ns b nt qe nv nw nx qf nz oa ob qg od oe of qh oh oi oj qi ol om on gn bk">Before running our features, we have some use-case components using the DataKoinModule. Those use-cases components are reusable business logic components. They are defined from the <code class="cx qr qs qt qu b">DomainKoinModule</code>:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="df3f" class="qy ph gu qu b bg qz ra l rb rc">@Module(includes = [DataKoinModule::class])<br/>@ComponentScan<br/>class DomainKoinModule</span></pre><p id="99e5" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">You can note that we don’t specify what package to scan. This means that the module will scan in the current package and sub-packages for annotated components:</p><figure class="pb pc pd pe pf nf mx my paragraph-image"><div class="mx my re"><picture><source srcSet="https://miro.medium.com/v2/resize:fit:640/format:webp/1*HQzVRHo6PAOtCLNZcEGKuQ.png 640w, https://miro.medium.com/v2/resize:fit:720/format:webp/1*HQzVRHo6PAOtCLNZcEGKuQ.png 720w, https://miro.medium.com/v2/resize:fit:750/format:webp/1*HQzVRHo6PAOtCLNZcEGKuQ.png 750w, https://miro.medium.com/v2/resize:fit:786/format:webp/1*HQzVRHo6PAOtCLNZcEGKuQ.png 786w, https://miro.medium.com/v2/resize:fit:828/format:webp/1*HQzVRHo6PAOtCLNZcEGKuQ.png 828w, https://miro.medium.com/v2/resize:fit:1100/format:webp/1*HQzVRHo6PAOtCLNZcEGKuQ.png 1100w, https://miro.medium.com/v2/resize:fit:866/format:webp/1*HQzVRHo6PAOtCLNZcEGKuQ.png 866w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 433px" type="image/webp"/><source data-testid="og" srcSet="https://miro.medium.com/v2/resize:fit:640/1*HQzVRHo6PAOtCLNZcEGKuQ.png 640w, https://miro.medium.com/v2/resize:fit:720/1*HQzVRHo6PAOtCLNZcEGKuQ.png 720w, https://miro.medium.com/v2/resize:fit:750/1*HQzVRHo6PAOtCLNZcEGKuQ.png 750w, https://miro.medium.com/v2/resize:fit:786/1*HQzVRHo6PAOtCLNZcEGKuQ.png 786w, https://miro.medium.com/v2/resize:fit:828/1*HQzVRHo6PAOtCLNZcEGKuQ.png 828w, https://miro.medium.com/v2/resize:fit:1100/1*HQzVRHo6PAOtCLNZcEGKuQ.png 1100w, https://miro.medium.com/v2/resize:fit:866/1*HQzVRHo6PAOtCLNZcEGKuQ.png 866w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 433px"/><img alt="" class="bh me nk c" width="433" height="169" loading="lazy" role="presentation"/></picture></div></figure><p id="e374" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">Each usecase component is declared with <code class="cx qr qs qt qu b">@Factory</code> annotation. This asks Koin to create a new instance each time we need it.</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="8f1c" class="qy ph gu qu b bg qz ra l rb rc">@Factory<br/>class GetFollowableTopicsStreamUseCase(<br/> private val topicsRepository: TopicsRepository,<br/> private val userDataRepository: UserDataRepository<br/>)</span></pre><blockquote class="oo op oq"><p id="0da7" class="nq nr or ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">Why not a singleton instance? Because those usecase components will be used with a <code class="cx qr qs qt qu b">ViewModel</code>, following the Android lifecycle. Making them as a singleton, we would take a risk to have references to a <code class="cx qr qs qt qu b">ViewModel</code> that are destroyed by the application.</p></blockquote><p id="f4ca" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">Finally, we are ready to use all of this in our Feature module. Each will then include <code class="cx qr qs qt qu b">DomainKoinModule</code> or <code class="cx qr qs qt qu b">DataKoinModule</code> to benefit from the common components:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="d552" class="qy ph gu qu b bg qz ra l rb rc">@Module(includes = [DomainKoinModule::class,StringDecoderKoinModule::class])<br/>@ComponentScan("com.google.samples.apps.nowinandroid.feature.author")<br/>class AuthorKoinModule</span></pre><p id="6ba3" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">By scanning the right package in our module, we will be able to declare our ViewModel instances like this:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="2a13" class="qy ph gu qu b bg qz ra l rb rc">@KoinViewModel<br/>class AuthorViewModel(<br/> savedStateHandle: SavedStateHandle,<br/> stringDecoder: StringDecoder,<br/> private val userDataRepository: UserDataRepository,<br/> authorsRepository: AuthorsRepository,<br/> getSaveableNewsResourcesStream: GetSaveableNewsResourcesStreamUseCase<br/>) : ViewModel()</span></pre><h1 id="846c" class="pg ph gu bf pi pj pk pl pm pn po pp pq pr ps pt pu pv pw px py pz qa qb qc qd bk">Sync Worker — Offline data sync with WorkManager</h1><p id="5217" class="pw-post-body-paragraph nq nr gu ns b nt qe nv nw nx qf nz oa ob qg od oe of qh oh oi oj qi ol om on gn bk">Finally, we need to declare our SyncWorker components, to asynchronously prepare offline content. This consists of a module:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="58fc" class="qy ph gu qu b bg qz ra l rb rc">@Module<br/>@ComponentScan<br/>class SyncWorkerKoinModule</span></pre><p id="aa04" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">The following definitions will be scanned by the module.</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="e140" class="qy ph gu qu b bg qz ra l rb rc">@Single<br/>class WorkManagerSyncStatusMonitor(<br/> context: Context<br/>) : SyncStatusMonitor</span></pre><p id="dafd" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk">And the <code class="cx qr qs qt qu b">SyncWorker</code> component declared with <code class="cx qr qs qt qu b">@KoinWorker</code> annotation. This will generate the equivalent of <code class="cx qr qs qt qu b">worker { }</code> DSL:</p><pre class="pb pc pd pe pf qv qu qw bp qx bb bk"><span id="695a" class="qy ph gu qu b bg qz ra l rb rc">@KoinWorker<br/>class SyncWorker (<br/> private val appContext: Context,<br/> workerParams: WorkerParameters,<br/> private val niaPreferences: NiaPreferencesDataSource,<br/> private val topicRepository: TopicsRepository,<br/> private val newsRepository: NewsRepository,<br/> private val authorsRepository: AuthorsRepository,<br/> private val ioDispatcher: CoroutineDispatcher,<br/>) : CoroutineWorker(appContext, workerParams), Synchronizer</span></pre><p id="13be" class="pw-post-body-paragraph nq nr gu ns b nt nu nv nw nx ny nz oa ob oc od oe of og oh oi oj ok ol om on gn bk"><code class="cx qr qs qt qu b">SyncWorker</code> will be declared with Workmanager Koin factory. This one has to be activated at the start like this:</p><figure class="pb pc pd pe pf nf mx my paragraph-image"><div role="button" tabindex="0" class="ng nh fj ni bh nj"><div class="mx my rf"><picture><source srcSet="https://miro.medium.com/v2/resize:fit:640/format:webp/1*7TDkzXW4mtotwat50QSQ8A.png 640w, https://miro.medium.com/v2/resize:fit:720/format:webp/1*7TDkzXW4mtotwat50QSQ8A.png 720w, https://miro.medium.com/v2/resize:fit:750/format:webp/1*7TDkzXW4mtotwat50QSQ8A.png 750w, https://miro.medium.com/v2/resize:fit:786/format:webp/1*7TDkzXW4mtotwat50QSQ8A.png 786w, https://miro.medium.com/v2/resize:fit:828/format:webp/1*7TDkzXW4mtotwat50QSQ8A.png 828w, https://miro.medium.com/v2/resize:fit:1100/format:webp/1*7TDkzXW4mtotwat50QSQ8A.png 1100w, https://miro.medium.com/v2/resize:fit:1400/format:webp/1*7TDkzXW4mtotwat50QSQ8A.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px" type="image/webp"/><source data-testid="og" srcSet="https://miro.medium.com/v2/resize:fit:640/1*7TDkzXW4mtotwat50QSQ8A.png 640w, https://miro.medium.com/v2/resize:fit:720/1*7TDkzXW4mtotwat50QSQ8A.png 720w, https://miro.medium.com/v2/resize:fit:750/1*7TDkzXW4mtotwat50QSQ8A.png 750w, https://miro.medium.com/v2/resize:fit:786/1*7TDkzXW4mtotwat50QSQ8A.png 786w, https://miro.medium.com/v2/resize:fit:828/1*7TDkzXW4mtotwat50QSQ8A.png 828w, https://miro.medium.com/v2/resize:fit:1100/1*7TDkzXW4mtotwat50QSQ8A.png 1100w, https://miro.medium.com/v2/resize:fit:1400/1*7TDkzXW4mtotwat50QSQ8A.png 1400w" sizes="(min-resolution: 4dppx) and (max-width: 700px) 50vw, (-webkit-min-device-pixel-ratio: 4) and (max-width: 700px) 50vw, (min-resolution: 3dppx) and (max-width: 700px) 67vw, (-webkit-min-device-pixel-ratio: 3) and (max-width: 700px) 65vw, (min-resolution: 2.5dppx) and (max-width: 700px) 80vw, (-webkit-min-device-pixel-ratio: 2.5) and (max-width: 700px) 80vw, (min-resolution: 2dppx) and (max-width: 700px) 100vw, (-webkit-min-device-pixel-ratio: 2) and (max-width: 700px) 100vw, 700px"/><img alt="" class="bh me nk c" width="700" height="190" loading="lazy" role="presentation"/></picture></div></div><figcaption class="nl ff nm mx my nn no bf b bg z du">Koin start in NiaApplication class</figcaption></figure></div></div></div><div class="ab cb os ot ou ov" role="separator"><span class="ow by bm ox oy oz"></span><span class="ow by bm ox oy oz"></span><span class="ow by bm ox oy"></span></div><div class="gn go gp gq gr"><div class="ab cb"><div class="ci bh fz ga gb gc"><h1 id="415f" class="pg ph gu bf pi pj rg pl pm pn rh pp pq pr ri pt pu pv rj px py pz rk qb qc qd bk">Koin Annotations — Cheat Sheet</h1><p id="bf1a" class="pw-post-body-paragraph nq nr gu ns b nt qe nv nw nx qf nz oa ob qg od oe of qh oh oi oj qi ol om on gn bk">Hope you enjoyed the walkthrough NowInAndroid application with Koin dependency injection and annotations. You will find below the last cheat sheet we’ve made.</p><div class="rl rm rn ro rp rq"><a href="https://blog.kotzilla.io/koin-3-2-annotations-cheat-sheets/?source=post_page-----fbdc855824ad--------------------------------" rel="noopener ugc nofollow" target="_blank"><div class="rr ab ix"><div class="rs ab co cb rt ru"><h2 class="bf gv io z jf rv jh ji rw jk jm gt bk">Koin 3.2 & Koin Annotations 1.0 — Cheat Sheets</h2><div class="rx l"><h3 class="bf b io z jf rv jh ji rw jk jm du">Hello Folks 👋 While we are at several conferences to show Architecture Design with Koin, Kotzilla is also offering…</h3></div><div class="ry l"><p class="bf b dv z jf rv jh ji rw jk jm du">blog.kotzilla.io</p></div></div><div class="rz l"><div class="sa l sb sc sd rz se me rq"></div></div></div></a></div></div></div></div></div></section></div></div></article></div><div class="ab cb"><div class="ci bh fz ga gb gc"><div class="sf sg ab ja"><div class="rx ab"><a class="sh ay am ao" href="https://medium.com/tag/android?source=post_page-----fbdc855824ad--------------------------------" rel="noopener follow"><div class="si fj cx sj ge sk sl bf b bg z bk sm">Android</div></a></div><div class="rx ab"><a class="sh ay am ao" href="https://medium.com/tag/kotlin?source=post_page-----fbdc855824ad--------------------------------" rel="noopener follow"><div class="si fj cx sj ge sk sl bf b bg z bk sm">Kotlin</div></a></div><div class="rx ab"><a class="sh ay am ao" href="https://medium.com/tag/dependency-injection?source=post_page-----fbdc855824ad--------------------------------" rel="noopener follow"><div class="si fj cx sj ge sk sl bf b bg z bk sm">Dependency Injection</div></a></div><div class="rx ab"><a class="sh ay am ao" href="https://medium.com/tag/koin?source=post_page-----fbdc855824ad--------------------------------" rel="noopener follow"><div class="si fj cx sj ge sk sl bf b bg z bk sm">Koin</div></a></div><div class="rx ab"><a class="sh ay am ao" 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:)","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"ImageMetadata:0*SgUInfHiU6tfX3-c.png":{"__typename":"ImageMetadata","id":"0*SgUInfHiU6tfX3-c.png","originalHeight":393,"originalWidth":700,"focusPercentX":null,"focusPercentY":null,"alt":null},"Paragraph:5a101a705abe_13":{"__typename":"Paragraph","id":"5a101a705abe_13","name":"c09a","type":"IMG","href":null,"layout":"INSET_CENTER","metadata":{"__ref":"ImageMetadata:0*SgUInfHiU6tfX3-c.png"},"text":"","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_14":{"__typename":"Paragraph","id":"5a101a705abe_14","name":"5aa3","type":"P","href":null,"layout":null,"metadata":null,"text":"Features picture from https:\u002F\u002Fgithub.com\u002Fandroid\u002Fnowinandroid","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"A","start":22,"end":61,"href":"https:\u002F\u002Fgithub.com\u002Fandroid\u002Fnowinandroid","anchorType":"LINK","userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_15":{"__typename":"Paragraph","id":"5a101a705abe_15","name":"766e","type":"P","href":null,"layout":null,"metadata":null,"text":"Previously in part 3, we saw how to setup and use Koin annotations with Koin dependency injection framework. It’s really easy as the Koin annotation processor can detect many cases, and generate your dependency injection configuration really quickly. It’s now time to dive into more components of the NowInAndroid project.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_16":{"__typename":"Paragraph","id":"5a101a705abe_16","name":"019b","type":"P","href":null,"layout":null,"metadata":null,"text":"You will have the reference for all the content to browse the code. Also, everything is available online on the Github repo: https:\u002F\u002Fgithub.com\u002FInsertKoinIO\u002Fnowinandroid\u002F","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"A","start":125,"end":170,"href":"https:\u002F\u002Fgithub.com\u002FInsertKoinIO\u002Fnowinandroid\u002Ftree\u002Frefacto_koin\u002Fannotations","anchorType":"LINK","userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_17":{"__typename":"Paragraph","id":"5a101a705abe_17","name":"1b53","type":"H3","href":null,"layout":null,"metadata":null,"text":"Common Data Layers","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_18":{"__typename":"Paragraph","id":"5a101a705abe_18","name":"7fed","type":"P","href":null,"layout":null,"metadata":null,"text":"Following the part 2 article, we will now go through the common core components that will be used by the features later. But this time, the configuration will be done with annotations.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"A","start":14,"end":28,"href":"https:\u002F\u002Fproandroiddev.com\u002Fnow-in-android-with-koin-part-2-49158741cb92#1936-6cf6d648e2ac-reply","anchorType":"LINK","userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_19":{"__typename":"Paragraph","id":"5a101a705abe_19","name":"c7a5","type":"P","href":null,"layout":null,"metadata":null,"text":"As a reminder, the Nia app is developed using Jetpack Compose and uses repository & use-case components:","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_20":{"__typename":"Paragraph","id":"5a101a705abe_20","name":"1ace","type":"ULI","href":null,"layout":null,"metadata":null,"text":"Repository to access data (network, database …)","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_21":{"__typename":"Paragraph","id":"5a101a705abe_21","name":"55d5","type":"ULI","href":null,"layout":null,"metadata":null,"text":"Usecase to handle business logic","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_22":{"__typename":"Paragraph","id":"5a101a705abe_22","name":"9c6e","type":"P","href":null,"layout":null,"metadata":null,"text":"The module that is gathering all those common components is theDataKoinModule.kt module:","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":63,"end":80,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"A","start":63,"end":80,"href":"https:\u002F\u002Fgithub.com\u002FInsertKoinIO\u002Fnowinandroid\u002Fblob\u002Frefacto_koin\u002Fannotations\u002Fcore\u002Fdata\u002Fsrc\u002Fmain\u002Fjava\u002Fcom\u002Fgoogle\u002Fsamples\u002Fapps\u002Fnowinandroid\u002Fcore\u002Fdata\u002Fdi\u002FDataKoinModule.kt#L48","anchorType":"LINK","userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_23":{"__typename":"Paragraph","id":"5a101a705abe_23","name":"155b","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@Module(includes = [DaosKoinModule::class, DataStoreKoinModule::class, NetworkKoinModule::class, DispatchersKoinModule::class, DataUtilModule::class])\n@ComponentScan(\"com.google.samples.apps.nowinandroid.core.data.repository\")\nclass DataKoinModule","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"EXPLICIT","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_24":{"__typename":"Paragraph","id":"5a101a705abe_24","name":"d29d","type":"P","href":null,"layout":null,"metadata":null,"text":"This module is making several things:","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_25":{"__typename":"Paragraph","id":"5a101a705abe_25","name":"2810","type":"ULI","href":null,"layout":null,"metadata":null,"text":"scans all repository classes defined in @ComponentScan","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":40,"end":54,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_26":{"__typename":"Paragraph","id":"5a101a705abe_26","name":"90f6","type":"ULI","href":null,"layout":null,"metadata":null,"text":"includes modules that are declaring sub-data layers components","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_27":{"__typename":"Paragraph","id":"5a101a705abe_27","name":"5c9d","type":"P","href":null,"layout":null,"metadata":null,"text":"Each repository class is simply tagged with @Single annotation like this:","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":44,"end":51,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_28":{"__typename":"Paragraph","id":"5a101a705abe_28","name":"219a","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@Single\nclass OfflineFirstAuthorsRepository(\n private val authorDao: AuthorDao,\n private val network: NiaNetworkDataSource,\n)","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_29":{"__typename":"Paragraph","id":"5a101a705abe_29","name":"45d5","type":"P","href":null,"layout":null,"metadata":null,"text":"You can find all the repository classes in the source code data package.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"A","start":43,"end":71,"href":"https:\u002F\u002Fgithub.com\u002FInsertKoinIO\u002Fnowinandroid\u002Ftree\u002Frefacto_koin\u002Fannotations\u002Fcore\u002Fdata\u002Fsrc\u002Fmain\u002Fjava\u002Fcom\u002Fgoogle\u002Fsamples\u002Fapps\u002Fnowinandroid\u002Fcore\u002Fdata\u002Frepository","anchorType":"LINK","userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_30":{"__typename":"Paragraph","id":"5a101a705abe_30","name":"b470","type":"H3","href":null,"layout":null,"metadata":null,"text":"Database Storage","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_31":{"__typename":"Paragraph","id":"5a101a705abe_31","name":"e15b","type":"P","href":null,"layout":null,"metadata":null,"text":"For the database storage layer, we need to declare our Room database instance via a function using the Room API builder like this:","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_32":{"__typename":"Paragraph","id":"5a101a705abe_32","name":"8846","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@Module\nclass DatabaseKoinModule {\n\n @Single\n fun database(context: Context) =\n Room.databaseBuilder(context, NiaDatabase::class.java, \"nia-database\")\n .build()\n}","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_33":{"__typename":"Paragraph","id":"5a101a705abe_33","name":"28db","type":"P","href":null,"layout":null,"metadata":null,"text":"The context parameter here is the Android Context instance from Koin.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":4,"end":11,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_34":{"__typename":"Paragraph","id":"5a101a705abe_34","name":"a368","type":"P","href":null,"layout":null,"metadata":null,"text":"In a second module, we can reuse our NiaDatabase instance below in DAOs:","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":37,"end":48,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_35":{"__typename":"Paragraph","id":"5a101a705abe_35","name":"7424","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@Module(includes = [DatabaseKoinModule::class])\nclass DaosKoinModule {\n\n @Single\n fun authorDao(niaDatabase: NiaDatabase) = niaDatabase.authorDao()\n\n @Single\n fun topicDao(niaDatabase: NiaDatabase) = niaDatabase.topicDao()\n\n @Single\n fun newsResourcesDao(niaDatabase: NiaDatabase) = niaDatabase.newsResourceDao()\n}","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"EXPLICIT","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_36":{"__typename":"Paragraph","id":"5a101a705abe_36","name":"ba81","type":"P","href":null,"layout":null,"metadata":null,"text":"That’s it! Our Database Layer is ready to be injected.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_37":{"__typename":"Paragraph","id":"5a101a705abe_37","name":"616d","type":"H3","href":null,"layout":null,"metadata":null,"text":"Datasource Components — Datastore & Networking","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_38":{"__typename":"Paragraph","id":"5a101a705abe_38","name":"b769","type":"P","href":null,"layout":null,"metadata":null,"text":"This layer defines Datasources which are components that abstract the calls to different sources of data. E.g: remote web service, local data storage, and so on. Therefore, the UI doesn’t need to know where the data comes from. It just calls the interface defined here.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_39":{"__typename":"Paragraph","id":"5a101a705abe_39","name":"158d","type":"P","href":null,"layout":null,"metadata":null,"text":"We are defining severasl kind of usages with NiaNetworkDatasource:","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":45,"end":65,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_40":{"__typename":"Paragraph","id":"5a101a705abe_40","name":"5d0c","type":"PRE","href":null,"layout":null,"metadata":null,"text":"interface NiaNetworkDataSource {\n suspend fun getTopics(ids: List\u003CString\u003E? = null): List\u003CNetworkTopic\u003E\n\n suspend fun getAuthors(ids: List\u003CString\u003E? = null): List\u003CNetworkAuthor\u003E\n\n suspend fun getNewsResources(ids: List\u003CString\u003E? = null): List\u003CNetworkNewsResource\u003E\n\n suspend fun getTopicChangeList(after: Int? = null): List\u003CNetworkChangeList\u003E\n\n suspend fun getAuthorChangeList(after: Int? = null): List\u003CNetworkChangeList\u003E\n\n suspend fun getNewsResourceChangeList(after: Int? = null): List\u003CNetworkChangeList\u003E\n}","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_41":{"__typename":"Paragraph","id":"5a101a705abe_41","name":"085b","type":"P","href":null,"layout":null,"metadata":null,"text":"First, we need to declare a default Coroutine dispatcher directly in a module:","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_42":{"__typename":"Paragraph","id":"5a101a705abe_42","name":"23d3","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@Module\nclass DispatchersKoinModule{\n \n @Single\n fun dispatcher() = Dispatchers.IO\n}","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_43":{"__typename":"Paragraph","id":"5a101a705abe_43","name":"7c43","type":"BQ","href":null,"layout":null,"metadata":null,"text":"In a test environment, you simply have to redefine a CoroutineDispatcher type to specify your needed one. Just add the new definition and it will override the existing one.","hasDropCap":true,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":53,"end":72,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_44":{"__typename":"Paragraph","id":"5a101a705abe_44","name":"71a4","type":"P","href":null,"layout":null,"metadata":null,"text":"The network module is declaring NiaNetworkDatasource, and is organized into 2 flavors:","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":32,"end":52,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"A","start":4,"end":18,"href":"https:\u002F\u002Fgithub.com\u002FInsertKoinIO\u002Fnowinandroid\u002Ftree\u002Frefacto_koin\u002Fannotations\u002Fcore\u002Fnetwork\u002Fsrc","anchorType":"LINK","userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_45":{"__typename":"Paragraph","id":"5a101a705abe_45","name":"a6b8","type":"ULI","href":null,"layout":null,"metadata":null,"text":"demo — with local data","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_46":{"__typename":"Paragraph","id":"5a101a705abe_46","name":"9b7f","type":"ULI","href":null,"layout":null,"metadata":null,"text":"prod — for online data","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_47":{"__typename":"Paragraph","id":"5a101a705abe_47","name":"03b4","type":"P","href":null,"layout":null,"metadata":null,"text":"The NetworkKoinModule includes the right flavour implementation:","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":4,"end":21,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_48":{"__typename":"Paragraph","id":"5a101a705abe_48","name":"28d4","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@Module(includes = [FlavoredNetworkKoinModule::class])\nclass NetworkKoinModule {\n\n @Single\n fun json() = Json { ignoreUnknownKeys = true }\n}","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"ImageMetadata:1*ZV6ZXgkeUT3JSQqFfOYLxw.png":{"__typename":"ImageMetadata","id":"1*ZV6ZXgkeUT3JSQqFfOYLxw.png","originalHeight":482,"originalWidth":820,"focusPercentX":null,"focusPercentY":null,"alt":null},"Paragraph:5a101a705abe_49":{"__typename":"Paragraph","id":"5a101a705abe_49","name":"3396","type":"IMG","href":null,"layout":"INSET_CENTER","metadata":{"__ref":"ImageMetadata:1*ZV6ZXgkeUT3JSQqFfOYLxw.png"},"text":"Demo flavor in Network module","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_50":{"__typename":"Paragraph","id":"5a101a705abe_50","name":"5b74","type":"P","href":null,"layout":null,"metadata":null,"text":"The demo flavour uses Datastore API and Protobuff API is used to store local data to display as an offline-first architecture.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_51":{"__typename":"Paragraph","id":"5a101a705abe_51","name":"99da","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@Module(includes = [DispatchersKoinModule::class])\n@ComponentScan(\"com.google.samples.apps.nowinandroid.core.network.fake\")\nclass FlavoredNetworkKoinModule{\n\n @Single\n fun assetManager(context: Context) = FakeAssetManager(context.assets::open)\n}","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"less"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_52":{"__typename":"Paragraph","id":"5a101a705abe_52","name":"2771","type":"P","href":null,"layout":null,"metadata":null,"text":"Below is the demo datasource implementation declared as a singleton:","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_53":{"__typename":"Paragraph","id":"5a101a705abe_53","name":"2466","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@Single\nclass FakeNiaNetworkDataSource(\n private val ioDispatcher: CoroutineDispatcher,\n private val networkJson: Json,\n private val assets: FakeAssetManager = JvmUnitTestFakeAssetManager,\n) : NiaNetworkDataSource","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_54":{"__typename":"Paragraph","id":"5a101a705abe_54","name":"10bf","type":"P","href":null,"layout":null,"metadata":null,"text":"The online version is declared with the following module:","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_55":{"__typename":"Paragraph","id":"5a101a705abe_55","name":"5e8d","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@Module(includes = [DispatchersKoinModule::class])\n@ComponentScan(\"com.google.samples.apps.nowinandroid.core.network.retrofit\")\nclass FlavoredNetworkKoinModule","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"less"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_56":{"__typename":"Paragraph","id":"5a101a705abe_56","name":"1f33","type":"P","href":null,"layout":null,"metadata":null,"text":"This module will scan the Retrofit 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Check the Datastore Persistence Module that is declaring the required components for NiaPreferencesDatasource.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":171,"end":195,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"A","start":96,"end":124,"href":"https:\u002F\u002Fgithub.com\u002FInsertKoinIO\u002Fnowinandroid\u002Fblob\u002Frefacto_koin\u002Fannotations\u002Fcore\u002Fdata\u002Fsrc\u002Fmain\u002Fjava\u002Fcom\u002Fgoogle\u002Fsamples\u002Fapps\u002Fnowinandroid\u002Fcore\u002Fdata\u002Fdi\u002FDataStoreKoinModule.kt","anchorType":"LINK","userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_59":{"__typename":"Paragraph","id":"5a101a705abe_59","name":"d3b3","type":"H3","href":null,"layout":null,"metadata":null,"text":"Domain & Features Modules","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_60":{"__typename":"Paragraph","id":"5a101a705abe_60","name":"a286","type":"P","href":null,"layout":null,"metadata":null,"text":"Before running our features, we have some use-case components using the DataKoinModule. 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This asks Koin to create a new instance each time we need it.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":40,"end":48,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_65":{"__typename":"Paragraph","id":"5a101a705abe_65","name":"8f1c","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@Factory\nclass GetFollowableTopicsStreamUseCase(\n private val topicsRepository: TopicsRepository,\n private val userDataRepository: UserDataRepository\n)","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_66":{"__typename":"Paragraph","id":"5a101a705abe_66","name":"0da7","type":"BQ","href":null,"layout":null,"metadata":null,"text":"Why not a singleton instance? Because those usecase components will be used with a ViewModel, following the Android lifecycle. Making them as a singleton, we would take a risk to have references to a ViewModel that are destroyed by the application.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":83,"end":92,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"CODE","start":200,"end":209,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_67":{"__typename":"Paragraph","id":"5a101a705abe_67","name":"f4ca","type":"P","href":null,"layout":null,"metadata":null,"text":"Finally, we are ready to use all of this in our Feature module. Each will then include DomainKoinModule or DataKoinModule to benefit from the common components:","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":87,"end":103,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"CODE","start":107,"end":121,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_68":{"__typename":"Paragraph","id":"5a101a705abe_68","name":"d552","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@Module(includes = [DomainKoinModule::class,StringDecoderKoinModule::class])\n@ComponentScan(\"com.google.samples.apps.nowinandroid.feature.author\")\nclass AuthorKoinModule","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"less"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_69":{"__typename":"Paragraph","id":"5a101a705abe_69","name":"6ba3","type":"P","href":null,"layout":null,"metadata":null,"text":"By scanning the right package in our module, we will be able to declare our ViewModel instances like this:","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_70":{"__typename":"Paragraph","id":"5a101a705abe_70","name":"2a13","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@KoinViewModel\nclass AuthorViewModel(\n savedStateHandle: SavedStateHandle,\n stringDecoder: StringDecoder,\n private val userDataRepository: UserDataRepository,\n authorsRepository: AuthorsRepository,\n getSaveableNewsResourcesStream: GetSaveableNewsResourcesStreamUseCase\n) : ViewModel()","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"less"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_71":{"__typename":"Paragraph","id":"5a101a705abe_71","name":"846c","type":"H3","href":null,"layout":null,"metadata":null,"text":"Sync Worker — Offline data sync with WorkManager","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_72":{"__typename":"Paragraph","id":"5a101a705abe_72","name":"5217","type":"P","href":null,"layout":null,"metadata":null,"text":"Finally, we need to declare our SyncWorker components, to asynchronously prepare offline content. This consists of a module:","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_73":{"__typename":"Paragraph","id":"5a101a705abe_73","name":"58fc","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@Module\n@ComponentScan\nclass SyncWorkerKoinModule","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"EXPLICIT","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_74":{"__typename":"Paragraph","id":"5a101a705abe_74","name":"aa04","type":"P","href":null,"layout":null,"metadata":null,"text":"The following definitions will be scanned by the module.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_75":{"__typename":"Paragraph","id":"5a101a705abe_75","name":"e140","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@Single\nclass WorkManagerSyncStatusMonitor(\n context: Context\n) : SyncStatusMonitor","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_76":{"__typename":"Paragraph","id":"5a101a705abe_76","name":"dafd","type":"P","href":null,"layout":null,"metadata":null,"text":"And the SyncWorker component declared with @KoinWorker annotation. This will generate the equivalent of worker { } DSL:","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":8,"end":18,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"CODE","start":43,"end":54,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"CODE","start":104,"end":114,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_77":{"__typename":"Paragraph","id":"5a101a705abe_77","name":"695a","type":"PRE","href":null,"layout":null,"metadata":null,"text":"@KoinWorker\nclass SyncWorker (\n private val appContext: Context,\n workerParams: WorkerParameters,\n private val niaPreferences: NiaPreferencesDataSource,\n private val topicRepository: TopicsRepository,\n private val newsRepository: NewsRepository,\n private val authorsRepository: AuthorsRepository,\n private val ioDispatcher: CoroutineDispatcher,\n) : CoroutineWorker(appContext, workerParams), Synchronizer","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":{"__typename":"CodeBlockMetadata","mode":"AUTO","lang":"kotlin"},"iframe":null,"mixtapeMetadata":null},"Paragraph:5a101a705abe_78":{"__typename":"Paragraph","id":"5a101a705abe_78","name":"13be","type":"P","href":null,"layout":null,"metadata":null,"text":"SyncWorker will be declared with Workmanager Koin factory. 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