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https://miro.medium.com/v2/resize:fit:828/1*i-3ZPps2Vxa1545Tic0WiQ.png 828w, https://miro.medium.com/v2/resize:fit:1100/1*i-3ZPps2Vxa1545Tic0WiQ.png 1100w, https://miro.medium.com/v2/resize:fit:1400/1*i-3ZPps2Vxa1545Tic0WiQ.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 mg nh c" width="700" height="260" loading="eager" role="presentation"/></picture></div></div></figure><p id="bc90" class="pw-post-body-paragraph ni nj hd nk b nl nm nn no np nq nr ns nt nu nv nw nx ny nz oa ob oc od oe of gw bk"><em class="og">Read Free — </em><a class="af oh" href="https://cleopatradouglas.medium.com/aeaa178bbf9a?sk=a9a0c1d7777b97adedf7e3b4cb302e65" rel="noopener"><em class="og">Here</em></a><em class="og">.</em></p><p id="dd15" class="pw-post-body-paragraph ni nj hd nk b nl nm nn no np nq nr ns nt nu nv nw nx ny nz oa ob oc od oe of gw bk">As a backend engineer, I often build endpoints and call other external endpoints to perform tasks or augment data.</p><p id="31f6" class="pw-post-body-paragraph ni nj hd nk b nl nm nn no np nq nr ns nt nu nv nw nx ny nz oa ob oc od oe of gw bk">As you can imagine, this involves having a lot of Futures when working with scala. After only a year and a couple of months (including a few days ago) of asking what’s wrong with my code, I think I have figured out a good framework for avoiding blocking issues (as much as possible).</p><h2 id="b69b" class="oi oj hd bf ok ol om dy on oo op ea oq nt or os ot nx ou ov ow ob ox oy oz pa bk">Simplify Chaining of Multiple Futures</h2><p id="1ff8" class="pw-post-body-paragraph ni nj hd nk b nl pb nn no np pc nr ns nt pd nv nw nx pe nz oa ob pf od oe of gw bk">Using <code class="cx pg ph pi pj b">for</code>-<code class="cx pg ph pi pj b">yield</code> with futures allows me to run them without waiting for each future to complete one at a time. Instead, it’ll run them concurrently and continue when all futures are complete, which can reduce the runtime and avoid blocking issues.</p><p id="cd04" class="pw-post-body-paragraph ni nj hd nk b nl nm nn no np nq nr ns nt nu nv nw nx ny nz oa ob oc od oe of gw bk">For example, if I have multiple futures, I want to call and combine, using. <code class="cx pg ph pi pj b">for</code>-<code class="cx pg ph pi pj b">yield</code> is both non-blocking and efficient:</p><pre class="pk pl pm pn po pp pj pq bp pr bb bk"><span id="cac5" class="ps oj hd pj b bg pt pu l pv pw">import scala.concurrent.Future<br/>import scala.concurrent.ExecutionContext.Implicits.global<br/><br/>def callMultipleFutures(): Future[ResultType] = {<br/> for {<br/> result1 <- future1()<br/> result2 <- future2(result1)<br/> result3 <- future3(result1, result2)<br/> } yield combineResults(result1, result2, result3)<br/>}</span></pre></div></div></div></div></section></div></div></article></div><div class="l"></div><footer 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https:\u002F\u002Fthejvmrabbithole.substack.com","isPartnerProgramEnrolled":true,"viewerEdge":{"__ref":"UserViewerEdge:userId:e1645eb9431-viewerId:lo_0e9186abf8a7"},"viewerIsUser":false,"postSubscribeMembershipUpsellShownAt":0,"membership":{"__ref":"Membership:2f1c7e8248ba"},"allowNotes":true,"twitterScreenName":"succedor23"},"Membership:2f1c7e8248ba":{"__typename":"Membership","tier":"MEMBER","id":"2f1c7e8248ba"},"Paragraph:1a1463eadcc0_0":{"__typename":"Paragraph","id":"1a1463eadcc0_0","name":"5736","type":"H3","href":null,"layout":null,"metadata":null,"text":"Mastering Futures in Scala: 3 Techniques to Avoid Blocking and Boost 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Here.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"A","start":12,"end":16,"href":"https:\u002F\u002Fcleopatradouglas.medium.com\u002Faeaa178bbf9a?source=friends_link&sk=a9a0c1d7777b97adedf7e3b4cb302e65","anchorType":"LINK","userId":null,"linkMetadata":null},{"__typename":"Markup","type":"EM","start":0,"end":17,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:1a1463eadcc0_3":{"__typename":"Paragraph","id":"1a1463eadcc0_3","name":"dd15","type":"P","href":null,"layout":null,"metadata":null,"text":"As a backend engineer, I often build endpoints and call other external endpoints to perform tasks or augment data.","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:1a1463eadcc0_4":{"__typename":"Paragraph","id":"1a1463eadcc0_4","name":"31f6","type":"P","href":null,"layout":null,"metadata":null,"text":"As you can imagine, this involves having a lot of Futures when working with scala. After only a year and a couple of months (including a few days ago) of asking what’s wrong with my code, I think I have figured out a good framework for avoiding blocking issues (as much as possible).","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:1a1463eadcc0_5":{"__typename":"Paragraph","id":"1a1463eadcc0_5","name":"b69b","type":"H4","href":null,"layout":null,"metadata":null,"text":"Simplify Chaining of Multiple Futures","hasDropCap":null,"dropCapImage":null,"markups":[],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:1a1463eadcc0_6":{"__typename":"Paragraph","id":"1a1463eadcc0_6","name":"1ff8","type":"P","href":null,"layout":null,"metadata":null,"text":"Using for-yield with futures allows me to run them without waiting for each future to complete one at a time. Instead, it’ll run them concurrently and continue when all futures are complete, which can reduce the runtime and avoid blocking issues.","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":6,"end":9,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"CODE","start":10,"end":15,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:1a1463eadcc0_7":{"__typename":"Paragraph","id":"1a1463eadcc0_7","name":"cd04","type":"P","href":null,"layout":null,"metadata":null,"text":"For example, if I have multiple futures, I want to call and combine, using. for-yield is both non-blocking and efficient:","hasDropCap":null,"dropCapImage":null,"markups":[{"__typename":"Markup","type":"CODE","start":76,"end":79,"href":null,"anchorType":null,"userId":null,"linkMetadata":null},{"__typename":"Markup","type":"CODE","start":80,"end":85,"href":null,"anchorType":null,"userId":null,"linkMetadata":null}],"codeBlockMetadata":null,"iframe":null,"mixtapeMetadata":null},"Paragraph:1a1463eadcc0_8":{"__typename":"Paragraph","id":"1a1463eadcc0_8","name":"cac5","type":"PRE","href":null,"layout":null,"metadata":null,"text":"import scala.concurrent.Future\nimport scala.concurrent.ExecutionContext.Implicits.global\n\ndef callMultipleFutures(): Future[ResultType] = {\n for {\n result1 \u003C- future1()\n result2 \u003C- future2(result1)\n result3 \u003C- future3(result1, result2)\n } yield combineResults(result1, result2, 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