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page</button></div><div class="theme-doc-markdown markdown"><header><h1>3. Evaluation Context</h1></header> <p><a href="https://github.com/open-feature/spec/tree/main/specification#experimental" target="_blank" rel="noopener noreferrer"><img decoding="async" loading="lazy" src="https://img.shields.io/static/v1?label=Status&message=experimental&color=orange" alt="experimental" class="img_ev3q"></a></p> <h2 class="anchor anchorWithStickyNavbar_LWe7" id="overview">Overview<a href="#overview" class="hash-link" aria-label="Direct link to Overview" title="Direct link to Overview"></a></h2> <p>The <code>evaluation context</code> provides ambient information for the purposes of flag evaluation. Contextual data may be used as the basis for targeting, including rule-based evaluation, overrides for specific subjects, or fractional flag evaluation.</p> <p>The context might contain information about the end-user, the application, the host, or any other ambient data that might be useful in flag evaluation. For example, a flag system might define rules that return a specific value based on the user's email address, locale, or the time of day. The context provides this information. The context can be optionally provided at evaluation, and mutated in <a href="/specification/sections/hooks">before hooks</a>.</p> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="31-fields">3.1 Fields<a href="#31-fields" class="hash-link" aria-label="Direct link to 3.1 Fields" title="Direct link to 3.1 Fields"></a></h3> <div class="markdown-alert markdown-alert-note"><p class="markdown-alert-title"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" viewBox="0 0 16 16"><path d="M8 15A7 7 0 1 1 8 1a7 7 0 0 1 0 14m0 1A8 8 0 1 0 8 0a8 8 0 0 0 0 16"></path><path d="m8.93 6.588-2.29.287-.082.38.45.083c.294.07.352.176.288.469l-.738 3.468c-.194.897.105 1.319.808 1.319.545 0 1.178-.252 1.465-.598l.088-.416c-.2.176-.492.246-.686.246-.275 0-.375-.193-.304-.533zM9 4.5a1 1 0 1 1-2 0 1 1 0 0 1 2 0"></path></svg>Note</p> <p>Field casing is not specified and should be chosen in accordance with language idioms.</p> </div> <p>see: <a href="/specification/types">types</a></p> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="requirement-311">Requirement 3.1.1<a href="#requirement-311" class="hash-link" aria-label="Direct link to Requirement 3.1.1" title="Direct link to Requirement 3.1.1"></a></h4> <blockquote> <p>The <code>evaluation context</code> structure <strong>MUST</strong> define an optional <code>targeting key</code> field of type string, identifying the subject of the flag evaluation.</p> </blockquote> <p>The targeting key uniquely identifies the subject (end-user, or client service) of a flag evaluation. Providers may require this field for fractional flag evaluation, rules, or overrides targeting specific users. Such providers may behave unpredictably if a targeting key is not specified at flag resolution.</p> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="requirement-312">Requirement 3.1.2<a href="#requirement-312" class="hash-link" aria-label="Direct link to Requirement 3.1.2" title="Direct link to Requirement 3.1.2"></a></h4> <blockquote> <p>The evaluation context <strong>MUST</strong> support the inclusion of custom fields, having keys of type <code>string</code>, and values of type <code>boolean | string | number | datetime | structure</code>.</p> </blockquote> <p>see: <a href="/specification/types#structure">structure</a>, <a href="/specification/types#datetime">datetime</a></p> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="requirement-313">Requirement 3.1.3<a href="#requirement-313" class="hash-link" aria-label="Direct link to Requirement 3.1.3" title="Direct link to Requirement 3.1.3"></a></h4> <blockquote> <p>The evaluation context <strong>MUST</strong> support fetching the custom fields by key and also fetching all key value pairs.</p> </blockquote> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="requirement-314">Requirement 3.1.4<a href="#requirement-314" class="hash-link" aria-label="Direct link to Requirement 3.1.4" title="Direct link to Requirement 3.1.4"></a></h4> <blockquote> <p>The evaluation context fields <strong>MUST</strong> have an unique key.</p> </blockquote> <p>The key uniquely identifies a field in the <code>evaluation context</code> and it should be unique across all types to avoid any collision when marshalling the <code>evaluation context</code> by the provider.</p> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="32-context-levels-and-merging">3.2 Context levels and merging<a href="#32-context-levels-and-merging" class="hash-link" aria-label="Direct link to 3.2 Context levels and merging" title="Direct link to 3.2 Context levels and merging"></a></h3> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="condition-321">Condition 3.2.1<a href="#condition-321" class="hash-link" aria-label="Direct link to Condition 3.2.1" title="Direct link to Condition 3.2.1"></a></h4> <blockquote> <p>The implementation uses the dynamic-context paradigm.</p> </blockquote> <p>see: <a href="/specification/glossary#dynamic-context-paradigm">dynamic-context paradigm</a></p> <h5 class="anchor anchorWithStickyNavbar_LWe7" id="conditional-requirement-3211">Conditional Requirement 3.2.1.1<a href="#conditional-requirement-3211" class="hash-link" aria-label="Direct link to Conditional Requirement 3.2.1.1" title="Direct link to Conditional Requirement 3.2.1.1"></a></h5> <blockquote> <p>The API, Client and invocation <strong>MUST</strong> have a method for supplying <code>evaluation context</code>.</p> </blockquote> <p>API (global) <code>evaluation context</code> can be used to supply static data to flag evaluation, such as an application identifier, compute region, or hostname. Client and invocation <code>evaluation context</code> are ideal for dynamic data, such as end-user attributes.</p> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="condition-322">Condition 3.2.2<a href="#condition-322" class="hash-link" aria-label="Direct link to Condition 3.2.2" title="Direct link to Condition 3.2.2"></a></h4> <p><a href="https://github.com/open-feature/spec/tree/main/specification#experimental" target="_blank" rel="noopener noreferrer"><img decoding="async" loading="lazy" src="https://img.shields.io/static/v1?label=Status&message=experimental&color=orange" alt="experimental" class="img_ev3q"></a></p> <blockquote> <p>The implementation uses the static-context paradigm.</p> </blockquote> <p>see: <a href="/specification/glossary#static-context-paradigm">static-context paradigm</a></p> <h5 class="anchor anchorWithStickyNavbar_LWe7" id="conditional-requirement-3221">Conditional Requirement 3.2.2.1<a href="#conditional-requirement-3221" class="hash-link" aria-label="Direct link to Conditional Requirement 3.2.2.1" title="Direct link to Conditional Requirement 3.2.2.1"></a></h5> <blockquote> <p>The API <strong>MUST</strong> have a method for setting the global <code>evaluation context</code>.</p> </blockquote> <p>API (global) <code>evaluation context</code> can be used to supply data to flag evaluation, such as (but not limited to) user name, email, or user organization membership changes.</p> <h5 class="anchor anchorWithStickyNavbar_LWe7" id="conditional-requirement-3222">Conditional Requirement 3.2.2.2<a href="#conditional-requirement-3222" class="hash-link" aria-label="Direct link to Conditional Requirement 3.2.2.2" title="Direct link to Conditional Requirement 3.2.2.2"></a></h5> <blockquote> <p>The Client and invocation <strong>MUST NOT</strong> have a method for supplying <code>evaluation context</code>.</p> </blockquote> <p>In the static-context paradigm, context is global. The client and invocation cannot supply evaluation context.</p> <h5 class="anchor anchorWithStickyNavbar_LWe7" id="conditional-requirement-3223">Conditional Requirement 3.2.2.3<a href="#conditional-requirement-3223" class="hash-link" aria-label="Direct link to Conditional Requirement 3.2.2.3" title="Direct link to Conditional Requirement 3.2.2.3"></a></h5> <blockquote> <p>The API <strong>MUST</strong> have a method for setting <code>evaluation context</code> for a <code>domain</code>.</p> </blockquote> <p>In the static-context paradigm, provider specific context can be set using the associated <code>domain</code>. The global context is used if there is no matching provider specific context.</p> <p>See <a href="/specification/sections/flag-evaluation#setting-a-provider">setting a provider</a>, <a href="/specification/glossary#domain">domain</a> for details.</p> <h5 class="anchor anchorWithStickyNavbar_LWe7" id="conditional-requirement-3224">Conditional Requirement 3.2.2.4<a href="#conditional-requirement-3224" class="hash-link" aria-label="Direct link to Conditional Requirement 3.2.2.4" title="Direct link to Conditional Requirement 3.2.2.4"></a></h5> <blockquote> <p>The API <strong>MUST</strong> have a mechanism to manage <code>evaluation context</code> for an associated <code>domain</code>.</p> </blockquote> <p>In the static-context paradigm, it's possible to create and remove provider-specific context. See <a href="/specification/sections/flag-evaluation#setting-a-provider">setting a provider</a>, <a href="/specification/glossary#domain">domain</a> for details.</p> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="requirement-323">Requirement 3.2.3<a href="#requirement-323" class="hash-link" aria-label="Direct link to Requirement 3.2.3" title="Direct link to Requirement 3.2.3"></a></h4> <blockquote> <p>Evaluation context <strong>MUST</strong> be merged in the order: API (global; lowest precedence) -> transaction -> client -> invocation -> before hooks (highest precedence), with duplicate values being overwritten.</p> </blockquote> <p>Any fields defined in the transaction <code>evaluation context</code> will overwrite duplicate fields defined in the global <code>evaluation context</code>, any fields defined in the client <code>evaluation context</code> will overwrite duplicate fields defined in the transaction <code>evaluation context</code>, and fields defined in the invocation <code>evaluation context</code> will overwrite duplicate fields defined globally or on the client. Any resulting <code>evaluation context</code> from a <a href="/specification/sections/hooks#requirement-434">before hook</a> will overwrite duplicate fields defined globally, on the client, or in the invocation.</p> <!-- --> <p>This describes the precedence of all <code>evaluation context</code> variants. Depending on the <code>paradigm</code>, not all variants might be available in an <code>SDK</code> implementation.</p> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="condition-324">Condition 3.2.4<a href="#condition-324" class="hash-link" aria-label="Direct link to Condition 3.2.4" title="Direct link to Condition 3.2.4"></a></h4> <p><a href="https://github.com/open-feature/spec/tree/main/specification#experimental" target="_blank" rel="noopener noreferrer"><img decoding="async" loading="lazy" src="https://img.shields.io/static/v1?label=Status&message=experimental&color=orange" alt="experimental" class="img_ev3q"></a></p> <blockquote> <p>The implementation uses the static-context paradigm.</p> </blockquote> <p>see: <a href="/specification/glossary#static-context-paradigm">static-context paradigm</a></p> <h5 class="anchor anchorWithStickyNavbar_LWe7" id="conditional-requirement-3241">Conditional Requirement 3.2.4.1<a href="#conditional-requirement-3241" class="hash-link" aria-label="Direct link to Conditional Requirement 3.2.4.1" title="Direct link to Conditional Requirement 3.2.4.1"></a></h5> <blockquote> <p>When the global <code>evaluation context</code> is set, the <code>on context changed</code> function <strong>MUST</strong> run.</p> </blockquote> <p>The SDK implementation must run the <code>on context changed</code> function on all registered provider that use the global <code>evaluation context</code> whenever it is mutated.</p> <h5 class="anchor anchorWithStickyNavbar_LWe7" id="conditional-requirement-3242">Conditional Requirement 3.2.4.2<a href="#conditional-requirement-3242" class="hash-link" aria-label="Direct link to Conditional Requirement 3.2.4.2" title="Direct link to Conditional Requirement 3.2.4.2"></a></h5> <blockquote> <p>When the <code>evaluation context</code> for a specific provider is set, the <code>on context changed</code> function <strong>MUST</strong> only run on the associated provider.</p> </blockquote> <p>The SDK implementation must run the <code>on context changed</code> function only on the provider that is scoped to the mutated <code>evaluation context</code>.</p> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="33-context-propagation">3.3 Context Propagation<a href="#33-context-propagation" class="hash-link" aria-label="Direct link to 3.3 Context Propagation" title="Direct link to 3.3 Context Propagation"></a></h3> <p><a href="https://github.com/open-feature/spec/tree/main/specification#experimental" target="_blank" rel="noopener noreferrer"><img decoding="async" loading="lazy" src="https://img.shields.io/static/v1?label=Status&message=experimental&color=orange" alt="experimental" class="img_ev3q"></a></p> <p><code>Transaction context</code> is a container for transaction-specific <code>evaluation context</code> (e.g. user id, user agent, IP). Transaction context can be set where specific data is available (e.g. an auth service or request handler) and by using the <code>transaction context propagator</code> it will automatically be applied to all flag evaluations within a transaction (e.g. a request or thread).</p> <p>The following shows a possible TypeScript implementation using <a href="https://nodejs.org/api/async_context.html" target="_blank" rel="noopener noreferrer">AsyncLocalStorage (async_hooks)</a>:</p> <div class="language-typescript codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-typescript codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#ffffff"><span class="token keyword" style="color:#c5a5c5">export</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">class</span><span class="token plain"> </span><span class="token class-name" style="color:#FAC863">AsyncLocalStorageTransactionContext</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">implements</span><span class="token plain"> </span><span class="token class-name" style="color:#FAC863">TransactionContextPropagator</span><span class="token plain"> </span><span class="token punctuation" style="color:#8dc891">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">private</span><span class="token plain"> asyncLocalStorage </span><span class="token operator" style="color:#d7deea">=</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">new</span><span class="token plain"> </span><span class="token class-name" style="color:#FAC863">AsyncLocalStorage</span><span class="token class-name operator" style="color:#d7deea"><</span><span class="token class-name" style="color:#FAC863">EvaluationContext</span><span class="token class-name operator" style="color:#d7deea">></span><span class="token punctuation" style="color:#8dc891">(</span><span class="token punctuation" style="color:#8dc891">)</span><span class="token punctuation" style="color:#8dc891">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"> </span><span class="token function" style="color:#79b6f2">getTransactionContext</span><span class="token punctuation" style="color:#8dc891">(</span><span class="token punctuation" style="color:#8dc891">)</span><span class="token operator" style="color:#d7deea">:</span><span class="token plain"> EvaluationContext </span><span class="token punctuation" style="color:#8dc891">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">return</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">this</span><span class="token punctuation" style="color:#8dc891">.</span><span class="token plain">asyncLocalStorage</span><span class="token punctuation" style="color:#8dc891">.</span><span class="token function" style="color:#79b6f2">getStore</span><span class="token punctuation" style="color:#8dc891">(</span><span class="token punctuation" style="color:#8dc891">)</span><span class="token plain"> </span><span class="token operator" style="color:#d7deea">??</span><span class="token plain"> </span><span class="token punctuation" style="color:#8dc891">{</span><span class="token punctuation" style="color:#8dc891">}</span><span class="token punctuation" style="color:#8dc891">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"> </span><span class="token punctuation" style="color:#8dc891">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"> </span><span class="token function" style="color:#79b6f2">setTransactionContext</span><span class="token punctuation" style="color:#8dc891">(</span><span class="token plain">context</span><span class="token operator" style="color:#d7deea">:</span><span class="token plain"> EvaluationContext</span><span class="token punctuation" style="color:#8dc891">,</span><span class="token plain"> </span><span class="token function-variable function" style="color:#79b6f2">callback</span><span class="token operator" style="color:#d7deea">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#8dc891">(</span><span class="token punctuation" style="color:#8dc891">)</span><span class="token plain"> </span><span class="token operator" style="color:#d7deea">=></span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">void</span><span class="token punctuation" style="color:#8dc891">)</span><span class="token operator" style="color:#d7deea">:</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">void</span><span class="token plain"> </span><span class="token punctuation" style="color:#8dc891">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">this</span><span class="token punctuation" style="color:#8dc891">.</span><span class="token plain">asyncLocalStorage</span><span class="token punctuation" style="color:#8dc891">.</span><span class="token function" style="color:#79b6f2">run</span><span class="token punctuation" style="color:#8dc891">(</span><span class="token plain">context</span><span class="token punctuation" style="color:#8dc891">,</span><span class="token plain"> callback</span><span class="token punctuation" style="color:#8dc891">)</span><span class="token punctuation" style="color:#8dc891">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"> </span><span class="token punctuation" style="color:#8dc891">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"></span><span class="token punctuation" style="color:#8dc891">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"></span><span class="token doc-comment comment" style="color:#999999">/**</span><br></span><span class="token-line" style="color:#ffffff"><span class="token doc-comment comment" style="color:#999999"> * This example is based on an express middleware.</span><br></span><span class="token-line" style="color:#ffffff"><span class="token doc-comment comment" style="color:#999999"> */</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain">app</span><span class="token punctuation" style="color:#8dc891">.</span><span class="token function" style="color:#79b6f2">use</span><span class="token punctuation" style="color:#8dc891">(</span><span class="token punctuation" style="color:#8dc891">(</span><span class="token plain">req</span><span class="token operator" style="color:#d7deea">:</span><span class="token plain"> Request</span><span class="token punctuation" style="color:#8dc891">,</span><span class="token plain"> res</span><span class="token operator" style="color:#d7deea">:</span><span class="token plain"> Response</span><span class="token punctuation" style="color:#8dc891">,</span><span class="token plain"> next</span><span class="token operator" style="color:#d7deea">:</span><span class="token plain"> NextFunction</span><span class="token punctuation" style="color:#8dc891">)</span><span class="token plain"> </span><span class="token operator" style="color:#d7deea">=></span><span class="token plain"> </span><span class="token punctuation" style="color:#8dc891">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">const</span><span class="token plain"> ip </span><span class="token operator" style="color:#d7deea">=</span><span class="token plain"> res</span><span class="token punctuation" style="color:#8dc891">.</span><span class="token plain">headers</span><span class="token punctuation" style="color:#8dc891">.</span><span class="token function" style="color:#79b6f2">get</span><span class="token punctuation" style="color:#8dc891">(</span><span class="token string" style="color:#8dc891">"X-Forwarded-For"</span><span class="token punctuation" style="color:#8dc891">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"> OpenFeature</span><span class="token punctuation" style="color:#8dc891">.</span><span class="token function" style="color:#79b6f2">setTransactionContext</span><span class="token punctuation" style="color:#8dc891">(</span><span class="token punctuation" style="color:#8dc891">{</span><span class="token plain"> targetingKey</span><span class="token operator" style="color:#d7deea">:</span><span class="token plain"> req</span><span class="token punctuation" style="color:#8dc891">.</span><span class="token plain">user</span><span class="token punctuation" style="color:#8dc891">.</span><span class="token plain">id</span><span class="token punctuation" style="color:#8dc891">,</span><span class="token plain"> ipAddress</span><span class="token operator" style="color:#d7deea">:</span><span class="token plain"> ip </span><span class="token punctuation" style="color:#8dc891">}</span><span class="token punctuation" style="color:#8dc891">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#8dc891">(</span><span class="token punctuation" style="color:#8dc891">)</span><span class="token plain"> </span><span class="token operator" style="color:#d7deea">=></span><span class="token plain"> </span><span class="token punctuation" style="color:#8dc891">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"> </span><span class="token comment" style="color:#999999">// The transaction context is used in any flag evaluation throughout the whole call chain of next </span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"> </span><span class="token function" style="color:#79b6f2">next</span><span class="token punctuation" style="color:#8dc891">(</span><span class="token punctuation" style="color:#8dc891">)</span><span class="token punctuation" style="color:#8dc891">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"> </span><span class="token punctuation" style="color:#8dc891">}</span><span class="token punctuation" style="color:#8dc891">)</span><span class="token punctuation" style="color:#8dc891">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#ffffff"><span class="token plain"></span><span class="token punctuation" style="color:#8dc891">}</span><span class="token punctuation" style="color:#8dc891">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="condition-331">Condition 3.3.1<a href="#condition-331" class="hash-link" aria-label="Direct link to Condition 3.3.1" title="Direct link to Condition 3.3.1"></a></h4> <blockquote> <p>The implementation uses the dynamic-context paradigm.</p> </blockquote> <p>see: <a href="/specification/glossary#dynamic-context-paradigm">dynamic-context paradigm</a></p> <h5 class="anchor anchorWithStickyNavbar_LWe7" id="conditional-requirement-3311">Conditional Requirement 3.3.1.1<a href="#conditional-requirement-3311" class="hash-link" aria-label="Direct link to Conditional Requirement 3.3.1.1" title="Direct link to Conditional Requirement 3.3.1.1"></a></h5> <blockquote> <p>The API <strong>SHOULD</strong> have a method for setting a <code>transaction context propagator</code>.</p> </blockquote> <p>If there already is a <code>transaction context propagator</code>, it is replaced with the new one.</p> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="condition-3312">Condition 3.3.1.2<a href="#condition-3312" class="hash-link" aria-label="Direct link to Condition 3.3.1.2" title="Direct link to Condition 3.3.1.2"></a></h4> <blockquote> <p>The SDK implements context propagation.</p> </blockquote> <p>A language may not have any applicable way of implementing <code>transaction context propagation</code> so the language SDK might not implement context propagation.</p> <h5 class="anchor anchorWithStickyNavbar_LWe7" id="conditional-requirement-33121">Conditional Requirement 3.3.1.2.1<a href="#conditional-requirement-33121" class="hash-link" aria-label="Direct link to Conditional Requirement 3.3.1.2.1" title="Direct link to Conditional Requirement 3.3.1.2.1"></a></h5> <blockquote> <p>The API <strong>MUST</strong> have a method for setting the <code>evaluation context</code> of the <code>transaction context propagator</code> for the current transaction.</p> </blockquote> <p>If a <code>transaction context propagator</code> is set, the SDK will call the <a href="#conditional-requirement-33122">method defined in 3.3.1.3</a> with this <code>evaluation context</code> and so this <code>evaluation context</code> will be available during the current transaction. If no <code>transaction context propagator</code> is set, this <code>evaluation context</code> is not used for evaluations. This method then can be used for example in a request handler to add request-specific information to the <code>evaluation context</code>.</p> <h5 class="anchor anchorWithStickyNavbar_LWe7" id="conditional-requirement-33122">Conditional Requirement 3.3.1.2.2<a href="#conditional-requirement-33122" class="hash-link" aria-label="Direct link to Conditional Requirement 3.3.1.2.2" title="Direct link to Conditional Requirement 3.3.1.2.2"></a></h5> <blockquote> <p>A <code>transaction context propagator</code> <strong>MUST</strong> have a method for setting the <code>evaluation context</code> of the current transaction.</p> </blockquote> <p>A <code>transaction context propagator</code> is responsible for persisting context for the duration of a single transaction. Typically, a transaction context propagator will propagate the context using a language-specific carrier such as <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ThreadLocal.html" target="_blank" rel="noopener noreferrer">ThreadLocal (Java)</a>, <a href="https://nodejs.org/api/async_hooks.html" target="_blank" rel="noopener noreferrer">async hooks (Node.js)</a>, <a href="https://pkg.go.dev/context" target="_blank" rel="noopener noreferrer">Context (Go)</a> or another similar mechanism.</p> <h5 class="anchor anchorWithStickyNavbar_LWe7" id="conditional-requirement-33123">Conditional Requirement 3.3.1.2.3<a href="#conditional-requirement-33123" class="hash-link" aria-label="Direct link to Conditional Requirement 3.3.1.2.3" title="Direct link to Conditional Requirement 3.3.1.2.3"></a></h5> <blockquote> <p>A <code>transaction context propagator</code> <strong>MUST</strong> have a method for getting the <code>evaluation context</code> of the current transaction.</p> </blockquote> <p>This will be used by the SDK implementation when merging the context for evaluating a feature flag.</p> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="condition-332">Condition 3.3.2<a href="#condition-332" class="hash-link" aria-label="Direct link to Condition 3.3.2" title="Direct link to Condition 3.3.2"></a></h4> <blockquote> <p>The implementation uses the static-context paradigm.</p> </blockquote> <p>see: <a href="/specification/glossary#static-context-paradigm">static-context paradigm</a></p> <h5 class="anchor anchorWithStickyNavbar_LWe7" id="conditional-requirement-3321">Conditional Requirement 3.3.2.1<a href="#conditional-requirement-3321" class="hash-link" aria-label="Direct link to Conditional Requirement 3.3.2.1" title="Direct link to Conditional Requirement 3.3.2.1"></a></h5> <blockquote> <p>The API <strong>MUST NOT</strong> have a method for setting a <code>transaction context propagator</code>.</p> </blockquote> <p>In the static-context paradigm, context is global, so there must not be different contexts between transactions.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col"><a href="https://github.com/open-feature/spec/edit/main/specification/sections/03-evaluation-context.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_JAkA"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/specification/sections/providers"><div class="pagination-nav__sublabel">Previous</div><div 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3.1.4</a></li></ul></li><li><a href="#32-context-levels-and-merging" class="table-of-contents__link toc-highlight">3.2 Context levels and merging</a><ul><li><a href="#condition-321" class="table-of-contents__link toc-highlight">Condition 3.2.1</a></li><li><a href="#condition-322" class="table-of-contents__link toc-highlight">Condition 3.2.2</a></li><li><a href="#requirement-323" class="table-of-contents__link toc-highlight">Requirement 3.2.3</a></li><li><a href="#condition-324" class="table-of-contents__link toc-highlight">Condition 3.2.4</a></li></ul></li><li><a href="#33-context-propagation" class="table-of-contents__link toc-highlight">3.3 Context Propagation</a><ul><li><a href="#condition-331" class="table-of-contents__link toc-highlight">Condition 3.3.1</a></li><li><a href="#condition-3312" class="table-of-contents__link toc-highlight">Condition 3.3.1.2</a></li><li><a href="#condition-332" class="table-of-contents__link toc-highlight">Condition 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