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DittoExtensionPoint.java
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DittoExtensionPoint.java
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/*
* Copyright (c) 2022 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.base.service;
import java.util.List;
import org.eclipse.ditto.internal.utils.akka.AkkaClassLoader;
import akka.actor.AbstractExtensionId;
import akka.actor.ActorSystem;
import akka.actor.ExtendedActorSystem;
import akka.actor.Extension;
/**
* Extension Point for extending Ditto via Akka Extensions to provide custom functionality to different
* aspects of the service.
*
* @since 3.0.0
*/
public abstract class DittoExtensionPoint implements Extension {
protected final ActorSystem actorSystem;
/**
* @param actorSystem the actor system in which to load the extension.
*/
protected DittoExtensionPoint(final ActorSystem actorSystem) {
this.actorSystem = actorSystem;
}
/**
* @param <T> the class of the extension for which an implementation should be loaded.
*/
protected static final class ExtensionId<T extends Extension> extends AbstractExtensionId<T> {
private final String implementation;
private final Class<T> parentClass;
/**
* Returns the {@code ExtensionId} for the implementation that should be loaded.
*
* @param implementation the implementation, optimally configurable via typesafe config and environment variables.
* @param parentClass the class of the extensions for which an implementation should be loaded.
*/
public ExtensionId(final String implementation, final Class<T> parentClass) {
this.implementation = implementation;
this.parentClass = parentClass;
}
@Override
public T createExtension(final ExtendedActorSystem system) {
return AkkaClassLoader.instantiate(system, parentClass,
implementation,
List.of(ActorSystem.class),
List.of(system));
}
}
}