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437:\n/***/ (function(module, exports) {\n\n\tmodule.exports = {\"data\":{\"allPostTitles\":{\"edges\":[{\"node\":{\"frontmatter\":{\"title\":\"Getting Started\",\"lesson\":1,\"category\":\"akkatecture\",\"chapter\":1,\"type\":\"docs\"},\"fields\":{\"slug\":\"/getting-started\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Primitives\",\"lesson\":1,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/primitives\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Walkthrough Introduction\",\"lesson\":1,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/walkthrough-introduction\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Sagas\",\"lesson\":1,\"category\":\"akkatecture\",\"chapter\":4,\"type\":\"docs\"},\"fields\":{\"slug\":\"/sagas\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Tips and Tricks\",\"lesson\":1,\"category\":\"akkatecture\",\"chapter\":5,\"type\":\"docs\"},\"fields\":{\"slug\":\"/tips-and-tricks\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Aggregates\",\"lesson\":2,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/aggregates\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First Aggregate\",\"lesson\":2,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/your-first-aggregate\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Snapshotting\",\"lesson\":2,\"category\":\"akkatecture\",\"chapter\":4,\"type\":\"docs\"},\"fields\":{\"slug\":\"/snapshotting\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Articles\",\"lesson\":2,\"category\":\"akkatecture\",\"chapter\":5,\"type\":\"docs\"},\"fields\":{\"slug\":\"/articles\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Events\",\"lesson\":3,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/events\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First Commands\",\"lesson\":3,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/your-first-commands\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Clustering\",\"lesson\":3,\"category\":\"akkatecture\",\"chapter\":4,\"type\":\"docs\"},\"fields\":{\"slug\":\"/clustering\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Videos\",\"lesson\":3,\"category\":\"akkatecture\",\"chapter\":5,\"type\":\"docs\"},\"fields\":{\"slug\":\"/videos\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Commands\",\"lesson\":4,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/commands\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First Events\",\"lesson\":4,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/your-first-events\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Production Readiness\",\"lesson\":4,\"category\":\"akkatecture\",\"chapter\":4,\"type\":\"docs\"},\"fields\":{\"slug\":\"/production-readiness\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Specifications\",\"lesson\":5,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/specifications\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First Specifications\",\"lesson\":5,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/your-first-specifications\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Event Upgrading\",\"lesson\":5,\"category\":\"akkatecture\",\"chapter\":4,\"type\":\"docs\"},\"fields\":{\"slug\":\"/event-upgrading\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Subscribers\",\"lesson\":6,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/subscribers\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First Aggregate Test\",\"lesson\":6,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/your-first-aggregate-test\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Testing Aggregates\",\"lesson\":6,\"category\":\"akkatecture\",\"chapter\":4,\"type\":\"docs\"},\"fields\":{\"slug\":\"/testing-aggregates\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Scheduled Jobs\",\"lesson\":7,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/scheduled-jobs\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First Aggregate Saga\",\"lesson\":7,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/your-first-aggregate-saga\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Akka\",\"lesson\":8,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/akka\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First 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>Before we dive into how to construct aggregate sagas in Akkatecture. We still need to wire up some crucial bits. We have laid out some fundamental building blocks, but have not put them all together. Let us do that before proceeding to the building out aggregate sagas.</p>\\n<h3 id=\\\"putting-it-all-together\\\"><a href=\\\"#putting-it-all-together\\\" aria-hidden=\\\"true\\\" class=\\\"anchor\\\"><svg aria-hidden=\\\"true\\\" height=\\\"16\\\" version=\\\"1.1\\\" viewBox=\\\"0 0 16 16\\\" width=\\\"16\\\"><path fill-rule=\\\"evenodd\\\" d=\\\"M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z\\\"></path></svg></a>Putting It All Together</h3>\\n<p>We need to tell our aggregate how to handle commands.</p>\\n<p>Use the <code class=\\\"language-text\\\">IExecute<></code> interface to register your command handlers:</p>\\n<div class=\\\"gatsby-highlight\\\">\\n <pre class=\\\"language-csharp\\\"><code class=\\\"language-csharp\\\"><span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">class</span> <span class=\\\"token class-name\\\">Account</span> <span class=\\\"token punctuation\\\">:</span> <span class=\\\"token class-name\\\">AggregateRoot</span><span class=\\\"token operator\\\"><</span>Account<span class=\\\"token punctuation\\\">,</span> AccountId<span class=\\\"token punctuation\\\">,</span> AccountState<span class=\\\"token operator\\\">></span><span class=\\\"token punctuation\\\">,</span>\\n IExecute<span class=\\\"token operator\\\"><</span>OpenNewAccountCommand<span class=\\\"token operator\\\">></span><span class=\\\"token punctuation\\\">,</span>\\n IExecute<span class=\\\"token operator\\\"><</span>TransferMoneyCommand<span class=\\\"token operator\\\">></span><span class=\\\"token punctuation\\\">,</span>\\n IExecute<span class=\\\"token operator\\\"><</span>ReceiveMoneyCommand<span class=\\\"token operator\\\">></span>\\n<span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">public</span> <span class=\\\"token function\\\">Account</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token class-name\\\">AccountId</span> aggregateId<span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">:</span> <span class=\\\"token keyword\\\">base</span><span class=\\\"token punctuation\\\">(</span>aggregateId<span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token punctuation\\\">}</span>\\n<span class=\\\"token punctuation\\\">}</span></code></pre>\\n </div>\\n<p>Now we can implement the <code class=\\\"language-text\\\">Execute(OpenNewAccountCommand)</code> method which comes from the <code class=\\\"language-text\\\">IExecute<OpenNewAccountCommand></code> contract.</p>\\n<div class=\\\"gatsby-highlight\\\">\\n <pre class=\\\"language-csharp\\\"><code class=\\\"language-csharp\\\"><span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">bool</span> <span class=\\\"token function\\\">Execute</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token class-name\\\">OpenNewAccountCommand</span> command<span class=\\\"token punctuation\\\">)</span>\\n<span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token comment\\\">//this spec is part of Akkatecture</span>\\n <span class=\\\"token keyword\\\">var</span> spec <span class=\\\"token operator\\\">=</span> <span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">AggregateIsNewSpecification</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token keyword\\\">if</span><span class=\\\"token punctuation\\\">(</span>spec<span class=\\\"token punctuation\\\">.</span><span class=\\\"token function\\\">IsSatisfiedBy</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token keyword\\\">this</span><span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">var</span> aggregateEvent <span class=\\\"token operator\\\">=</span> <span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">AccountOpenedEvent</span><span class=\\\"token punctuation\\\">(</span>command<span class=\\\"token punctuation\\\">.</span>OpeningBalance<span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token function\\\">Emit</span><span class=\\\"token punctuation\\\">(</span>aggregateEvent<span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token punctuation\\\">}</span>\\n\\n <span class=\\\"token keyword\\\">return</span> <span class=\\\"token keyword\\\">true</span><span class=\\\"token punctuation\\\">;</span>\\n<span class=\\\"token punctuation\\\">}</span></code></pre>\\n </div>\\n<blockquote>\\n<p>We return true from the execute method, to let akka know that we handled the command successfully.</p>\\n</blockquote>\\n<p>To be able to send money from one account to another the business requirements specified that; <em>The transaction fee for a successful money deposit is €0.25. The minimum amount of money allowed to transfer is €1.00. Which means that the minimum amount of money allowed to exit a bank account is €1.25</em>.\\nWe can model these requirements as specifications as:</p>\\n<div class=\\\"gatsby-highlight\\\">\\n <pre class=\\\"language-csharp\\\"><code class=\\\"language-csharp\\\"><span class=\\\"token comment\\\">//Walkthrough.Domain/Model/Account/Specifications/MinimumTransferAmountSpecification.cs</span>\\n<span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">class</span> <span class=\\\"token class-name\\\">MinimumTransferAmountSpecification</span> <span class=\\\"token punctuation\\\">:</span> <span class=\\\"token class-name\\\">Specification</span><span class=\\\"token operator\\\"><</span>AccountState<span class=\\\"token operator\\\">></span>\\n<span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">protected</span> <span class=\\\"token keyword\\\">override</span> IEnumerable<span class=\\\"token operator\\\"><</span><span class=\\\"token keyword\\\">string</span><span class=\\\"token operator\\\">></span> <span class=\\\"token function\\\">IsNotSatisfiedBecause</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token class-name\\\">AccountState</span> state<span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">if</span> <span class=\\\"token punctuation\\\">(</span>state<span class=\\\"token punctuation\\\">.</span>Balance<span class=\\\"token punctuation\\\">.</span>Value <span class=\\\"token operator\\\"><</span> <span class=\\\"token number\\\">1.00</span>m<span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">yield</span> <span class=\\\"token keyword\\\">return</span> $<span class=\\\"token string\\\">\\\"Account Balance={state.Balance.Value} is lower than 1.00\\\"</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token punctuation\\\">}</span>\\n <span class=\\\"token punctuation\\\">}</span>\\n<span class=\\\"token punctuation\\\">}</span>\\n\\n<span class=\\\"token comment\\\">//Walkthrough.Domain/Model/Account/Specifications/EnoughBalanceAmountSpecification.cs</span>\\n<span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">class</span> <span class=\\\"token class-name\\\">EnoughBalanceAmountSpecification</span> <span class=\\\"token punctuation\\\">:</span> <span class=\\\"token class-name\\\">Specification</span><span class=\\\"token operator\\\"><</span>AccountState<span class=\\\"token operator\\\">></span>\\n<span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">protected</span> <span class=\\\"token keyword\\\">override</span> IEnumerable<span class=\\\"token operator\\\"><</span><span class=\\\"token keyword\\\">string</span><span class=\\\"token operator\\\">></span> <span class=\\\"token function\\\">IsNotSatisfiedBecause</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token class-name\\\">AccountState</span> state<span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">if</span> <span class=\\\"token punctuation\\\">(</span>state<span class=\\\"token punctuation\\\">.</span>Balance<span class=\\\"token punctuation\\\">.</span>Value <span class=\\\"token operator\\\"><</span> <span class=\\\"token number\\\">1.25</span>m<span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">yield</span> <span class=\\\"token keyword\\\">return</span> $<span class=\\\"token string\\\">\\\"'Balance for Account: {obj.Id} is {obj.State.Balance.Value}' is lower than 1.25\\\"</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token punctuation\\\">}</span>\\n <span class=\\\"token punctuation\\\">}</span>\\n<span class=\\\"token punctuation\\\">}</span></code></pre>\\n </div>\\n<p>Now we can do our command handler for the <code class=\\\"language-text\\\">TransferMoneyCommand</code>.</p>\\n<div class=\\\"gatsby-highlight\\\">\\n <pre class=\\\"language-csharp\\\"><code class=\\\"language-csharp\\\"><span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">bool</span> <span class=\\\"token function\\\">Execute</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token class-name\\\">TransferMoneyCommand</span> command<span class=\\\"token punctuation\\\">)</span>\\n<span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">var</span> balanceSpec <span class=\\\"token operator\\\">=</span> <span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">EnoughBalanceAmountSpecification</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token keyword\\\">var</span> minimumTransferSpec <span class=\\\"token operator\\\">=</span> <span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">MinimumTransferAmountSpecification</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token keyword\\\">var</span> andSpec <span class=\\\"token operator\\\">=</span> balanceSpec<span class=\\\"token punctuation\\\">.</span><span class=\\\"token function\\\">And</span><span class=\\\"token punctuation\\\">(</span>minimumTransferSpec<span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token keyword\\\">if</span><span class=\\\"token punctuation\\\">(</span>andSpec<span class=\\\"token punctuation\\\">.</span><span class=\\\"token function\\\">IsSatisfiedBy</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token keyword\\\">this</span><span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">var</span> moneySentEvent <span class=\\\"token operator\\\">=</span> <span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">MoneySentEvent</span><span class=\\\"token punctuation\\\">(</span>command<span class=\\\"token punctuation\\\">.</span>Transaction<span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token keyword\\\">var</span> feesDeductedEvent <span class=\\\"token operator\\\">=</span> <span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">FeesDeductedEvent</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">Money</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token number\\\">0.25</span>m<span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n\\n <span class=\\\"token function\\\">EmitAll</span><span class=\\\"token punctuation\\\">(</span>moneySentEvent<span class=\\\"token punctuation\\\">,</span> feesDeductedEvent<span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n <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></code></pre>\\n </div>\\n<blockquote>\\n<p>We have a command that actually produced two events as the outcome of its sucessful execution. This is quite ok and can happen from time to time. One successful command does not necessarily mean that only one event can be emitted. Transfering money reduces the account balance and charges a fee. For auditing purposes, it is a good to have these as separate events. Use the <code class=\\\"language-text\\\">EmitAll(...)</code> API when it comes to emitting more than one event from the same execution context to preserve the same transactional qualities that you need when persisting events to the event journal.</p>\\n</blockquote>\\n<p>Finally we need to handle the receiving of money from <code class=\\\"language-text\\\">ReceiveMoneyCommand</code>.</p>\\n<div class=\\\"gatsby-highlight\\\">\\n <pre class=\\\"language-csharp\\\"><code class=\\\"language-csharp\\\"><span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">bool</span> <span class=\\\"token function\\\">Execute</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token class-name\\\">ReceiveMoneyCommand</span> command<span class=\\\"token punctuation\\\">)</span>\\n<span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">var</span> moneyReceivedEvent <span class=\\\"token operator\\\">=</span> <span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">MoneyReceivedEvent</span><span class=\\\"token punctuation\\\">(</span>command<span class=\\\"token punctuation\\\">.</span>Transaction<span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n\\n <span class=\\\"token function\\\">Emit</span><span class=\\\"token punctuation\\\">(</span>moneyReceivedEvent<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></code></pre>\\n </div>\\n<h3 id=\\\"summary\\\"><a href=\\\"#summary\\\" aria-hidden=\\\"true\\\" class=\\\"anchor\\\"><svg aria-hidden=\\\"true\\\" height=\\\"16\\\" version=\\\"1.1\\\" viewBox=\\\"0 0 16 16\\\" width=\\\"16\\\"><path fill-rule=\\\"evenodd\\\" d=\\\"M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z\\\"></path></svg></a>Summary</h3>\\n<p>We codified our business specifications (rules) into models that derive from <code class=\\\"language-text\\\">Specification<></code>. This allows us to have testable specifications that live in one place. We used the specifications to guard our domains against rule breaking commands. We even used an <code class=\\\"language-text\\\">AndSpecification<></code> to compose our specifications. You can build your own compositions as well using <a href=\\\"https://github.com/Lutando/Akkatecture/tree/master/src/Akkatecture/Specifications/Provided\\\">these</a>. Do not over use your specifications, it is not a silver bullet, and be aware of the <a href=\\\"https://en.wikipedia.org/wiki/Specification_pattern#Criticisms\\\">criticisms</a> of specifications, finally, one should also be wary of using them outside of your domain layer. Reducing code duplication also increases code coupling.</p>\\n<p>Next we shall go over how to craft your own <strong>aggregate tests</strong>. An important part of having maintainable code!</p>\\n<p><a href=\\\"/docs/your-first-aggregate-test\\\">Next →</a></p>\",\"timeToRead\":3,\"excerpt\":\"Before we dive into how to construct aggregate sagas in Akkatecture. We still need to wire up some crucial bits. We have laid out some…\",\"frontmatter\":{\"title\":\"Your First Specifications\",\"cover\":\"https://unsplash.it/400/300/?random?BoldMage\",\"date\":\"01/07/2018\",\"category\":\"akkatecture\",\"tags\":[\"walkthrough\",\"akkatecture\",\"specifications\",\"csharp\",\"dotnet\"]},\"fields\":{\"slug\":\"/your-first-specifications\"}}},\"pathContext\":{\"slug\":\"/your-first-specifications\",\"category\":\"akkatecture\"}}\n\n/***/ })\n\n});\n\n\n// WEBPACK FOOTER //\n// path---docs-your-first-specifications-d0f8e15acce78f13739c.js","module.exports = {\"data\":{\"allPostTitles\":{\"edges\":[{\"node\":{\"frontmatter\":{\"title\":\"Getting Started\",\"lesson\":1,\"category\":\"akkatecture\",\"chapter\":1,\"type\":\"docs\"},\"fields\":{\"slug\":\"/getting-started\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Primitives\",\"lesson\":1,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/primitives\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Walkthrough Introduction\",\"lesson\":1,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/walkthrough-introduction\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Sagas\",\"lesson\":1,\"category\":\"akkatecture\",\"chapter\":4,\"type\":\"docs\"},\"fields\":{\"slug\":\"/sagas\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Tips and Tricks\",\"lesson\":1,\"category\":\"akkatecture\",\"chapter\":5,\"type\":\"docs\"},\"fields\":{\"slug\":\"/tips-and-tricks\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Aggregates\",\"lesson\":2,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/aggregates\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First Aggregate\",\"lesson\":2,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/your-first-aggregate\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Snapshotting\",\"lesson\":2,\"category\":\"akkatecture\",\"chapter\":4,\"type\":\"docs\"},\"fields\":{\"slug\":\"/snapshotting\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Articles\",\"lesson\":2,\"category\":\"akkatecture\",\"chapter\":5,\"type\":\"docs\"},\"fields\":{\"slug\":\"/articles\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Events\",\"lesson\":3,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/events\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First Commands\",\"lesson\":3,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/your-first-commands\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Clustering\",\"lesson\":3,\"category\":\"akkatecture\",\"chapter\":4,\"type\":\"docs\"},\"fields\":{\"slug\":\"/clustering\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Videos\",\"lesson\":3,\"category\":\"akkatecture\",\"chapter\":5,\"type\":\"docs\"},\"fields\":{\"slug\":\"/videos\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Commands\",\"lesson\":4,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/commands\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First Events\",\"lesson\":4,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/your-first-events\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Production Readiness\",\"lesson\":4,\"category\":\"akkatecture\",\"chapter\":4,\"type\":\"docs\"},\"fields\":{\"slug\":\"/production-readiness\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Specifications\",\"lesson\":5,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/specifications\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First Specifications\",\"lesson\":5,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/your-first-specifications\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Event Upgrading\",\"lesson\":5,\"category\":\"akkatecture\",\"chapter\":4,\"type\":\"docs\"},\"fields\":{\"slug\":\"/event-upgrading\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Subscribers\",\"lesson\":6,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/subscribers\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First Aggregate Test\",\"lesson\":6,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/your-first-aggregate-test\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Testing Aggregates\",\"lesson\":6,\"category\":\"akkatecture\",\"chapter\":4,\"type\":\"docs\"},\"fields\":{\"slug\":\"/testing-aggregates\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Scheduled Jobs\",\"lesson\":7,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/scheduled-jobs\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First Aggregate Saga\",\"lesson\":7,\"category\":\"akkatecture\",\"chapter\":3,\"type\":\"docs\"},\"fields\":{\"slug\":\"/your-first-aggregate-saga\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Akka\",\"lesson\":8,\"category\":\"akkatecture\",\"chapter\":2,\"type\":\"docs\"},\"fields\":{\"slug\":\"/akka\"}}},{\"node\":{\"frontmatter\":{\"title\":\"Your First 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>Before we dive into how to construct aggregate sagas in Akkatecture. We still need to wire up some crucial bits. We have laid out some fundamental building blocks, but have not put them all together. Let us do that before proceeding to the building out aggregate sagas.</p>\\n<h3 id=\\\"putting-it-all-together\\\"><a href=\\\"#putting-it-all-together\\\" aria-hidden=\\\"true\\\" class=\\\"anchor\\\"><svg aria-hidden=\\\"true\\\" height=\\\"16\\\" version=\\\"1.1\\\" viewBox=\\\"0 0 16 16\\\" width=\\\"16\\\"><path fill-rule=\\\"evenodd\\\" d=\\\"M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z\\\"></path></svg></a>Putting It All Together</h3>\\n<p>We need to tell our aggregate how to handle commands.</p>\\n<p>Use the <code class=\\\"language-text\\\">IExecute<></code> interface to register your command handlers:</p>\\n<div class=\\\"gatsby-highlight\\\">\\n <pre class=\\\"language-csharp\\\"><code class=\\\"language-csharp\\\"><span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">class</span> <span class=\\\"token class-name\\\">Account</span> <span class=\\\"token punctuation\\\">:</span> <span class=\\\"token class-name\\\">AggregateRoot</span><span class=\\\"token operator\\\"><</span>Account<span class=\\\"token punctuation\\\">,</span> AccountId<span class=\\\"token punctuation\\\">,</span> AccountState<span class=\\\"token operator\\\">></span><span class=\\\"token punctuation\\\">,</span>\\n IExecute<span class=\\\"token operator\\\"><</span>OpenNewAccountCommand<span class=\\\"token operator\\\">></span><span class=\\\"token punctuation\\\">,</span>\\n IExecute<span class=\\\"token operator\\\"><</span>TransferMoneyCommand<span class=\\\"token operator\\\">></span><span class=\\\"token punctuation\\\">,</span>\\n IExecute<span class=\\\"token operator\\\"><</span>ReceiveMoneyCommand<span class=\\\"token operator\\\">></span>\\n<span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">public</span> <span class=\\\"token function\\\">Account</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token class-name\\\">AccountId</span> aggregateId<span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">:</span> <span class=\\\"token keyword\\\">base</span><span class=\\\"token punctuation\\\">(</span>aggregateId<span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token punctuation\\\">}</span>\\n<span class=\\\"token punctuation\\\">}</span></code></pre>\\n </div>\\n<p>Now we can implement the <code class=\\\"language-text\\\">Execute(OpenNewAccountCommand)</code> method which comes from the <code class=\\\"language-text\\\">IExecute<OpenNewAccountCommand></code> contract.</p>\\n<div class=\\\"gatsby-highlight\\\">\\n <pre class=\\\"language-csharp\\\"><code class=\\\"language-csharp\\\"><span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">bool</span> <span class=\\\"token function\\\">Execute</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token class-name\\\">OpenNewAccountCommand</span> command<span class=\\\"token punctuation\\\">)</span>\\n<span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token comment\\\">//this spec is part of Akkatecture</span>\\n <span class=\\\"token keyword\\\">var</span> spec <span class=\\\"token operator\\\">=</span> <span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">AggregateIsNewSpecification</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token keyword\\\">if</span><span class=\\\"token punctuation\\\">(</span>spec<span class=\\\"token punctuation\\\">.</span><span class=\\\"token function\\\">IsSatisfiedBy</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token keyword\\\">this</span><span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">var</span> aggregateEvent <span class=\\\"token operator\\\">=</span> <span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">AccountOpenedEvent</span><span class=\\\"token punctuation\\\">(</span>command<span class=\\\"token punctuation\\\">.</span>OpeningBalance<span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token function\\\">Emit</span><span class=\\\"token punctuation\\\">(</span>aggregateEvent<span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token punctuation\\\">}</span>\\n\\n <span class=\\\"token keyword\\\">return</span> <span class=\\\"token keyword\\\">true</span><span class=\\\"token punctuation\\\">;</span>\\n<span class=\\\"token punctuation\\\">}</span></code></pre>\\n </div>\\n<blockquote>\\n<p>We return true from the execute method, to let akka know that we handled the command successfully.</p>\\n</blockquote>\\n<p>To be able to send money from one account to another the business requirements specified that; <em>The transaction fee for a successful money deposit is €0.25. The minimum amount of money allowed to transfer is €1.00. Which means that the minimum amount of money allowed to exit a bank account is €1.25</em>.\\nWe can model these requirements as specifications as:</p>\\n<div class=\\\"gatsby-highlight\\\">\\n <pre class=\\\"language-csharp\\\"><code class=\\\"language-csharp\\\"><span class=\\\"token comment\\\">//Walkthrough.Domain/Model/Account/Specifications/MinimumTransferAmountSpecification.cs</span>\\n<span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">class</span> <span class=\\\"token class-name\\\">MinimumTransferAmountSpecification</span> <span class=\\\"token punctuation\\\">:</span> <span class=\\\"token class-name\\\">Specification</span><span class=\\\"token operator\\\"><</span>AccountState<span class=\\\"token operator\\\">></span>\\n<span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">protected</span> <span class=\\\"token keyword\\\">override</span> IEnumerable<span class=\\\"token operator\\\"><</span><span class=\\\"token keyword\\\">string</span><span class=\\\"token operator\\\">></span> <span class=\\\"token function\\\">IsNotSatisfiedBecause</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token class-name\\\">AccountState</span> state<span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">if</span> <span class=\\\"token punctuation\\\">(</span>state<span class=\\\"token punctuation\\\">.</span>Balance<span class=\\\"token punctuation\\\">.</span>Value <span class=\\\"token operator\\\"><</span> <span class=\\\"token number\\\">1.00</span>m<span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">yield</span> <span class=\\\"token keyword\\\">return</span> $<span class=\\\"token string\\\">\\\"Account Balance={state.Balance.Value} is lower than 1.00\\\"</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token punctuation\\\">}</span>\\n <span class=\\\"token punctuation\\\">}</span>\\n<span class=\\\"token punctuation\\\">}</span>\\n\\n<span class=\\\"token comment\\\">//Walkthrough.Domain/Model/Account/Specifications/EnoughBalanceAmountSpecification.cs</span>\\n<span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">class</span> <span class=\\\"token class-name\\\">EnoughBalanceAmountSpecification</span> <span class=\\\"token punctuation\\\">:</span> <span class=\\\"token class-name\\\">Specification</span><span class=\\\"token operator\\\"><</span>AccountState<span class=\\\"token operator\\\">></span>\\n<span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">protected</span> <span class=\\\"token keyword\\\">override</span> IEnumerable<span class=\\\"token operator\\\"><</span><span class=\\\"token keyword\\\">string</span><span class=\\\"token operator\\\">></span> <span class=\\\"token function\\\">IsNotSatisfiedBecause</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token class-name\\\">AccountState</span> state<span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">if</span> <span class=\\\"token punctuation\\\">(</span>state<span class=\\\"token punctuation\\\">.</span>Balance<span class=\\\"token punctuation\\\">.</span>Value <span class=\\\"token operator\\\"><</span> <span class=\\\"token number\\\">1.25</span>m<span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">yield</span> <span class=\\\"token keyword\\\">return</span> $<span class=\\\"token string\\\">\\\"'Balance for Account: {obj.Id} is {obj.State.Balance.Value}' is lower than 1.25\\\"</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token punctuation\\\">}</span>\\n <span class=\\\"token punctuation\\\">}</span>\\n<span class=\\\"token punctuation\\\">}</span></code></pre>\\n </div>\\n<p>Now we can do our command handler for the <code class=\\\"language-text\\\">TransferMoneyCommand</code>.</p>\\n<div class=\\\"gatsby-highlight\\\">\\n <pre class=\\\"language-csharp\\\"><code class=\\\"language-csharp\\\"><span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">bool</span> <span class=\\\"token function\\\">Execute</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token class-name\\\">TransferMoneyCommand</span> command<span class=\\\"token punctuation\\\">)</span>\\n<span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">var</span> balanceSpec <span class=\\\"token operator\\\">=</span> <span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">EnoughBalanceAmountSpecification</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token keyword\\\">var</span> minimumTransferSpec <span class=\\\"token operator\\\">=</span> <span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">MinimumTransferAmountSpecification</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token keyword\\\">var</span> andSpec <span class=\\\"token operator\\\">=</span> balanceSpec<span class=\\\"token punctuation\\\">.</span><span class=\\\"token function\\\">And</span><span class=\\\"token punctuation\\\">(</span>minimumTransferSpec<span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token keyword\\\">if</span><span class=\\\"token punctuation\\\">(</span>andSpec<span class=\\\"token punctuation\\\">.</span><span class=\\\"token function\\\">IsSatisfiedBy</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token keyword\\\">this</span><span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">)</span>\\n <span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">var</span> moneySentEvent <span class=\\\"token operator\\\">=</span> <span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">MoneySentEvent</span><span class=\\\"token punctuation\\\">(</span>command<span class=\\\"token punctuation\\\">.</span>Transaction<span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n <span class=\\\"token keyword\\\">var</span> feesDeductedEvent <span class=\\\"token operator\\\">=</span> <span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">FeesDeductedEvent</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">Money</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token number\\\">0.25</span>m<span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n\\n <span class=\\\"token function\\\">EmitAll</span><span class=\\\"token punctuation\\\">(</span>moneySentEvent<span class=\\\"token punctuation\\\">,</span> feesDeductedEvent<span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n <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></code></pre>\\n </div>\\n<blockquote>\\n<p>We have a command that actually produced two events as the outcome of its sucessful execution. This is quite ok and can happen from time to time. One successful command does not necessarily mean that only one event can be emitted. Transfering money reduces the account balance and charges a fee. For auditing purposes, it is a good to have these as separate events. Use the <code class=\\\"language-text\\\">EmitAll(...)</code> API when it comes to emitting more than one event from the same execution context to preserve the same transactional qualities that you need when persisting events to the event journal.</p>\\n</blockquote>\\n<p>Finally we need to handle the receiving of money from <code class=\\\"language-text\\\">ReceiveMoneyCommand</code>.</p>\\n<div class=\\\"gatsby-highlight\\\">\\n <pre class=\\\"language-csharp\\\"><code class=\\\"language-csharp\\\"><span class=\\\"token keyword\\\">public</span> <span class=\\\"token keyword\\\">bool</span> <span class=\\\"token function\\\">Execute</span><span class=\\\"token punctuation\\\">(</span><span class=\\\"token class-name\\\">ReceiveMoneyCommand</span> command<span class=\\\"token punctuation\\\">)</span>\\n<span class=\\\"token punctuation\\\">{</span>\\n <span class=\\\"token keyword\\\">var</span> moneyReceivedEvent <span class=\\\"token operator\\\">=</span> <span class=\\\"token keyword\\\">new</span> <span class=\\\"token class-name\\\">MoneyReceivedEvent</span><span class=\\\"token punctuation\\\">(</span>command<span class=\\\"token punctuation\\\">.</span>Transaction<span class=\\\"token punctuation\\\">)</span><span class=\\\"token punctuation\\\">;</span>\\n\\n <span class=\\\"token function\\\">Emit</span><span class=\\\"token punctuation\\\">(</span>moneyReceivedEvent<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></code></pre>\\n </div>\\n<h3 id=\\\"summary\\\"><a href=\\\"#summary\\\" aria-hidden=\\\"true\\\" class=\\\"anchor\\\"><svg aria-hidden=\\\"true\\\" height=\\\"16\\\" version=\\\"1.1\\\" viewBox=\\\"0 0 16 16\\\" width=\\\"16\\\"><path fill-rule=\\\"evenodd\\\" d=\\\"M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z\\\"></path></svg></a>Summary</h3>\\n<p>We codified our business specifications (rules) into models that derive from <code class=\\\"language-text\\\">Specification<></code>. This allows us to have testable specifications that live in one place. We used the specifications to guard our domains against rule breaking commands. We even used an <code class=\\\"language-text\\\">AndSpecification<></code> to compose our specifications. You can build your own compositions as well using <a href=\\\"https://github.com/Lutando/Akkatecture/tree/master/src/Akkatecture/Specifications/Provided\\\">these</a>. Do not over use your specifications, it is not a silver bullet, and be aware of the <a href=\\\"https://en.wikipedia.org/wiki/Specification_pattern#Criticisms\\\">criticisms</a> of specifications, finally, one should also be wary of using them outside of your domain layer. Reducing code duplication also increases code coupling.</p>\\n<p>Next we shall go over how to craft your own <strong>aggregate tests</strong>. An important part of having maintainable code!</p>\\n<p><a href=\\\"/docs/your-first-aggregate-test\\\">Next →</a></p>\",\"timeToRead\":3,\"excerpt\":\"Before we dive into how to construct aggregate sagas in Akkatecture. We still need to wire up some crucial bits. We have laid out some…\",\"frontmatter\":{\"title\":\"Your First Specifications\",\"cover\":\"https://unsplash.it/400/300/?random?BoldMage\",\"date\":\"01/07/2018\",\"category\":\"akkatecture\",\"tags\":[\"walkthrough\",\"akkatecture\",\"specifications\",\"csharp\",\"dotnet\"]},\"fields\":{\"slug\":\"/your-first-specifications\"}}},\"pathContext\":{\"slug\":\"/your-first-specifications\",\"category\":\"akkatecture\"}}\n\n\n//////////////////\n// WEBPACK FOOTER\n// ./~/json-loader!./.cache/json/docs-your-first-specifications.json\n// module id = 437\n// module chunks = 142113052403013"],"sourceRoot":""}