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<h1><a href="#deployer" name="deployer" class="anchor"><span class="anchor-link"></span></a>Deployer</h1>
<pre class="prettyprint"><code class="language-scala">trait Deployer {
def deployRepository[F[_]: Async, ID: EntityIDCodec, S, E, Alg[_[_]], RepositoryAlg[_[_]]](
repository: RepositoryInterpreter[F, ID, Alg, RepositoryAlg],
behavior: BehaviorInterpreter[F, S, E, Alg],
sideEffect: SideEffectInterpreter[F, S, Alg, RepositoryAlg]
)(implicit
nameProvider: EntityNameProvider[ID],
commandProtocol: CommandProtocol[ID, Alg],
eventApplier: EventApplier[S, E],
parameters: DeploymentParameters[F, ID, S, E]
): Resource[F, Deployment[F, RepositoryAlg]]
}
</code></pre>
<p><a href="api/core/endless/core/entity/Deployer.html" title="endless.core.entity.Deployer"><code>Deployer</code></a> brings everything together to “materialize” an entity repository. It returns a <code>Deployment</code> instance wrapped in a cats-effect <code>Resource</code> (to support finalization). The <code>Deployment</code> type is defined by implementers (aka. the runtime, e.g. <a href="api/pekko-runtime/endless/runtime/pekko/deploy/PekkoDeployer.html" title="endless.runtime.pekko.deploy.PekkoDeployer"><code>PekkoDeployer</code></a>), and is meant to provide a <code>RepositoryAlg</code> instance allowing for interactions with the deployed repository. It can also expose extra fields or methods that are relevant to the particular runtime. </p>
<p><code>deployRepository</code> is parametrized with the following type parameters:</p>
<ul>
<li><code>F[_]</code>: abstract effectful context <code>F</code> encapsulating all values, e.g. <code>IO[*]</code></li>
<li><code>Alg[_[_]]</code>: algebra allowing interaction with the entity, e.g. <a href="https://github.com/endless4s/endless/tree/v0.31.0/example/src/main/scala/endless/example/algebra/BookingAlg.scala">BookingAlg[IO[*]]</a></li>
<li><code>RepositoryAlg[_[_]]</code>: repository algebra, e.g. <a href="https://github.com/endless4s/endless/tree/v0.31.0/example/src/main/scala/endless/example/algebra/BookingsAlg.scala">BookingsAlg[IO[*]]</a></li>
<li><code>ID</code>: entity ID, e.g. <code>final case class BookingID(id: UUID) extends AnyVal</code></li>
<li><code>S</code>: entity state, e.g. <a href="https://github.com/endless4s/endless/tree/v0.31.0/example/src/main/scala/endless/example/data/Booking.scala">Booking</a></li>
<li><code>E</code>: entity event, e.g. <a href="https://github.com/endless4s/endless/tree/v0.31.0/example/src/main/scala/endless/example/data/BookingEvent.scala">BookingEvent</a></li>
</ul>
<p>Repository operation is defined by the interpreted repository, behavior and side-effect algebras, following a strictly defined sequence:</p>
<ol>
<li>the interpreted repository is used to create a handle on the entity with the specified ID. This handle implements the entity algebra, using which the caller can interact with the entity.</li>
<li>when a function of the entity algebra is invoked, the invocation is serialized using the <code>commandProtocol</code> and sent over the wire thanks to <a href="endless.core.protocol.CommandSender">CommandSender</a>. It is then decoded on the server side and run with the provided <code>behavior</code> interpreter: this typically involves reading the entity state (e.g. for validation) and writing events (which leads to a new version of the state via the <code>eventApplier</code> folding function)</li>
<li>after events are written, a possible side-effect is triggered: this supports asynchronicity (i.e. starting fibers)</li>
<li>the function finally returns to the caller with the result of the operation, encoded over the wire as a reply using <code>commandProtocol</code> and delivered back to the caller thanks to <code>CommandSender</code>.</li>
</ol>
<p>See also sequence diagrams in <a href="example.html">Example App</a> that represent this flow for a concrete entity.</p>
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