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POJ Oliver CommonDomain saga sample
 

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  1. POJ Oliver CommonDomain saga sample
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    <p>I was playing around with Jonathan Oliver's CommonDomain Saga Implementation. For me to wrap my head around this, I implemented a simple saga a below and an in memory saga repository. I am doing this to really understand how sagas will work under various scenarios. Before I put in a NSB or another framework, I needed to play with this to better understand the concept.</p> <p>I am not sure if I am using this correctly though. There are no tests or sample implementation for CommonDomain saga. I used the saga as event handlers for the events it transitions.</p> <p>Does this make sense? Any feedback would be appreciated.</p> <pre><code>public class QueryExecutionSaga : SagaBase&lt;IEvent&lt;QueryExecutionID&gt;&gt;, IEventHandler&lt;QueryExecutedNow&gt;, IEventHandler&lt;QueryExecutionCancelled&gt; { public QueryID QueryID { get; private set; } public QueryExecutionID QueryExecutionID { get; private set; } public QueryExecutionSaga() { Register&lt;QueryExecutedNow&gt;(Handle); Register&lt;QueryExecutionCancelled&gt;(Handle); } #region Implementation of IEventHandler&lt;in QueryExecutedNow&gt; public void Handle(QueryExecutedNow theEvent) { ID = new SagaID(theEvent.Identity.Identifier); QueryID = theEvent.QueryID; QueryExecutionID = theEvent.Identity; // send prepare query results command } #endregion #region Implementation of IEventHandler&lt;in QueryExecutionC.ancelled&gt; public void Handle(QueryExecutionCancelled theEvent) { // send notify sender command } #endregion public void Handle(IEvent&lt;IIdentity&gt; e) { Transition(e); } } </code></pre>
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    1. COThis post (http://stackoverflow.com/questions/6891990/j-olivers-event-store-saga-help) helped me point out a mistake in the code above. "The commands are put in the headers to be sent on the bus". So sending commands in handle methods will not work. I'll update code as I figure this out.
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    2. COIt turns out the correct way to send commands from the headers will be in the saga repository when the events are saved. The header for event(s) will be parsed and commands will be sent to bus in the repository. https://groups.google.com/d/msg/dddcqrs/SvuayN-IgaA/Pn_4dtyrknIJ
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