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They allow you to have listeners within the actor system listening to domain events that get published from the aggregate roots. The events that this type of subscriber listens to come from akka.net's <a href=\\\"https://getakka.net/articles/utilities/event-bus.html\\\">EventStream</a>.</p>\\n<div class=\\\"gatsby-highlight\\\">\\n      <pre class=\\\"language-csharp\\\"><code class=\\\"language-csharp\\\"><span class=\\\"token comment\\\">//subscriber counts how many games have ended</span>\\n<span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">class</span> <span class=\\\"token class-name\\\">GamesEndedSubscriber</span> <span class=\\\"token punctuation\\\">:</span> <span class=\\\"token class-name\\\">DomainEventSubscriber</span><span class=\\\"token punctuation\\\">,</span>\\n    ISubscribeTo<span class=\\\"token operator\\\">&lt;</span>GameAggregate<span class=\\\"token punctuation\\\">,</span> GameAggregateId<span class=\\\"token punctuation\\\">,</span> GameEndedEvent<span class=\\\"token operator\\\">></span>\\n<span class=\\\"token punctuation\\\">{</span>\\n    <span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">int</span> Count <span class=\\\"token punctuation\\\">{</span> <span class=\\\"token keyword\\\">get</span><span class=\\\"token punctuation\\\">;</span> <span class=\\\"token keyword\\\">set</span><span class=\\\"token punctuation\\\">;</span><span class=\\\"token punctuation\\\">}</span> <span class=\\\"token operator\\\">=</span> <span class=\\\"token number\\\">0</span><span class=\\\"token punctuation\\\">;</span>\\n \\n    <span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">bool</span> <span class=\\\"token function\\\">Handle</span><span class=\\\"token punctuation\\\">(</span>IDomainEvent<span class=\\\"token operator\\\">&lt;</span>GameAggregate<span class=\\\"token punctuation\\\">,</span> GameAggregateId<span class=\\\"token punctuation\\\">,</span> GameEndedEvent<span class=\\\"token operator\\\">></span> domainEvent<span class=\\\"token punctuation\\\">)</span>\\n    <span class=\\\"token punctuation\\\">{</span>\\n        Count<span class=\\\"token operator\\\">++</span><span class=\\\"token punctuation\\\">;</span>\\n        Logger<span class=\\\"token punctuation\\\">.</span><span class=\\\"token function\\\">Info</span><span class=\\\"token punctuation\\\">(</span>$<span class=\\\"token string\\\">\\\"{Count} Games ended so far.\\\"</span><span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n        <span class=\\\"token keyword\\\">return</span> <span class=\\\"token keyword\\\">true</span><span class=\\\"token punctuation\\\">;</span>\\n    <span class=\\\"token punctuation\\\">}</span>\\n<span class=\\\"token punctuation\\\">}</span></code></pre>\\n      </div>\\n<p><code class=\\\"language-text\\\">DomainEventSubscriber</code>s are actors that subscribe to domain events, domain even subscribers can be thought of as tiny microservices that live within your actor system. some examples of common usages for <code class=\\\"language-text\\\">DomainEventSubscriber</code>s could be: </p>\\n<ul>\\n<li>Persist projected data.</li>\\n<li>Re-publish events onto external message queues.</li>\\n<li>Fascilitate in distributed computations and workflows.</li>\\n</ul>\\n<p>Do take note! If your subscription actor is doing \\\"dangerous\\\" work, such as  doing <code class=\\\"language-text\\\">I/O</code>, consider applying the <a href=\\\"https://petabridge.com/blog/how-actors-recover-from-failure-hierarchy-and-supervision/\\\">error kernel</a> pattern to defer the danger of <code class=\\\"language-text\\\">I/O</code> failure away from the subscription actor. Create a child actor that will be responsible for doing the dangerous <code class=\\\"language-text\\\">I/O</code> work, and then make that child actor susceptible to failure. Always defer potential exceptions away from parent actors, and let akka.net's <a href=\\\"http://getakka.net/articles/concepts/supervision.html\\\">supervision</a> protect your domain event subscribers from failure.</p>\\n<blockquote>\\n<p>If you want a subscriber to interact between aggregate or domain boundaries, Akkatecture ships with an <code class=\\\"language-text\\\">AggregateSaga&lt;,,&gt;</code> implementation that has been specifically tailored for this use case. To learn more about sagas (otherwise known as process managers, or activities, go <a href=\\\"/docs/sagas\\\">here</a>)</p>\\n</blockquote>\\n<p><a href=\\\"/docs/scheduled-jobs\\\">Next, Scheduled Jobs →</a></p>\",\"timeToRead\":1,\"excerpt\":\"Subscribers in Akkatecture come in the form of  . 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Subscribers\",\"lesson\":8,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/your-first-subscribers\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Configuration\",\"lesson\":9,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/configuration\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First Projections\",\"lesson\":9,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/your-first-projections\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Walkthrough Ending\",\"lesson\":10,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/walkthrough-ending\"}}}]},\"postBySlug\":{\"html\":\"<p>Subscribers in Akkatecture come in the form of <code class=\\\"language-text\\\">DomainEventSubscriber</code>. They allow you to have listeners within the actor system listening to domain events that get published from the aggregate roots. The events that this type of subscriber listens to come from akka.net's <a href=\\\"https://getakka.net/articles/utilities/event-bus.html\\\">EventStream</a>.</p>\\n<div class=\\\"gatsby-highlight\\\">\\n      <pre class=\\\"language-csharp\\\"><code class=\\\"language-csharp\\\"><span class=\\\"token comment\\\">//subscriber counts how many games have ended</span>\\n<span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">class</span> <span class=\\\"token class-name\\\">GamesEndedSubscriber</span> <span class=\\\"token punctuation\\\">:</span> <span class=\\\"token class-name\\\">DomainEventSubscriber</span><span class=\\\"token punctuation\\\">,</span>\\n    ISubscribeTo<span class=\\\"token operator\\\">&lt;</span>GameAggregate<span class=\\\"token punctuation\\\">,</span> GameAggregateId<span class=\\\"token punctuation\\\">,</span> GameEndedEvent<span class=\\\"token operator\\\">></span>\\n<span class=\\\"token punctuation\\\">{</span>\\n    <span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">int</span> Count <span class=\\\"token punctuation\\\">{</span> <span class=\\\"token keyword\\\">get</span><span class=\\\"token punctuation\\\">;</span> <span class=\\\"token keyword\\\">set</span><span class=\\\"token punctuation\\\">;</span><span class=\\\"token punctuation\\\">}</span> <span class=\\\"token operator\\\">=</span> <span class=\\\"token number\\\">0</span><span class=\\\"token punctuation\\\">;</span>\\n \\n    <span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">bool</span> <span class=\\\"token function\\\">Handle</span><span class=\\\"token punctuation\\\">(</span>IDomainEvent<span class=\\\"token operator\\\">&lt;</span>GameAggregate<span class=\\\"token punctuation\\\">,</span> GameAggregateId<span class=\\\"token punctuation\\\">,</span> GameEndedEvent<span class=\\\"token operator\\\">></span> domainEvent<span class=\\\"token punctuation\\\">)</span>\\n    <span class=\\\"token punctuation\\\">{</span>\\n        Count<span class=\\\"token operator\\\">++</span><span class=\\\"token punctuation\\\">;</span>\\n        Logger<span class=\\\"token punctuation\\\">.</span><span class=\\\"token function\\\">Info</span><span class=\\\"token punctuation\\\">(</span>$<span class=\\\"token string\\\">\\\"{Count} Games ended so far.\\\"</span><span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n        <span class=\\\"token keyword\\\">return</span> <span class=\\\"token keyword\\\">true</span><span class=\\\"token punctuation\\\">;</span>\\n    <span class=\\\"token punctuation\\\">}</span>\\n<span class=\\\"token punctuation\\\">}</span></code></pre>\\n      </div>\\n<p><code class=\\\"language-text\\\">DomainEventSubscriber</code>s are actors that subscribe to domain events, domain even subscribers can be thought of as tiny microservices that live within your actor system. some examples of common usages for <code class=\\\"language-text\\\">DomainEventSubscriber</code>s could be: </p>\\n<ul>\\n<li>Persist projected data.</li>\\n<li>Re-publish events onto external message queues.</li>\\n<li>Fascilitate in distributed computations and workflows.</li>\\n</ul>\\n<p>Do take note! If your subscription actor is doing \\\"dangerous\\\" work, such as  doing <code class=\\\"language-text\\\">I/O</code>, consider applying the <a href=\\\"https://petabridge.com/blog/how-actors-recover-from-failure-hierarchy-and-supervision/\\\">error kernel</a> pattern to defer the danger of <code class=\\\"language-text\\\">I/O</code> failure away from the subscription actor. Create a child actor that will be responsible for doing the dangerous <code class=\\\"language-text\\\">I/O</code> work, and then make that child actor susceptible to failure. Always defer potential exceptions away from parent actors, and let akka.net's <a href=\\\"http://getakka.net/articles/concepts/supervision.html\\\">supervision</a> protect your domain event subscribers from failure.</p>\\n<blockquote>\\n<p>If you want a subscriber to interact between aggregate or domain boundaries, Akkatecture ships with an <code class=\\\"language-text\\\">AggregateSaga&lt;,,&gt;</code> implementation that has been specifically tailored for this use case. To learn more about sagas (otherwise known as process managers, or activities, go <a href=\\\"/docs/sagas\\\">here</a>)</p>\\n</blockquote>\\n<p><a href=\\\"/docs/scheduled-jobs\\\">Next, Scheduled Jobs →</a></p>\",\"timeToRead\":1,\"excerpt\":\"Subscribers in Akkatecture come in the form of  . They allow you to have listeners within the actor system listening to domain events that…\",\"frontmatter\":{\"title\":\"Subscribers\",\"cover\":\"https://unsplash.it/400/300/?random?BoldMage\",\"date\":\"01/07/2018\",\"category\":\"akkatecture\",\"tags\":[\"basic-concepts\",\"akkatecture\",\"csharp\",\"dotnet\"]},\"fields\":{\"slug\":\"/subscribers\"}}},\"pathContext\":{\"slug\":\"/subscribers\",\"category\":\"akkatecture\"}}\n\n\n//////////////////\n// WEBPACK FOOTER\n// ./~/json-loader!./.cache/json/docs-subscribers.json\n// module id = 425\n// module chunks = 87691678318370"],"sourceRoot":""}