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EdgeCommandForwarderExtension.java
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EdgeCommandForwarderExtension.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.edge.service.dispatching;
import static org.eclipse.ditto.base.model.common.ConditionChecker.checkNotNull;
import org.eclipse.ditto.base.service.DittoExtensionIds;
import org.eclipse.ditto.base.service.DittoExtensionPoint;
import org.eclipse.ditto.internal.utils.config.ScopedConfig;
import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;
import akka.actor.AbstractActor.Receive;
import akka.actor.ActorContext;
import akka.actor.ActorSystem;
/**
* This extension allows to extend commands that are forwarded from the edges of Ditto to other microservices by
* handling them in the {@link Receive} provided by {@link #getReceiveExtension(ActorContext)}.
*/
public interface EdgeCommandForwarderExtension extends DittoExtensionPoint {
/**
* Loads the implementation of {@code RootChildActorStarter} which is configured for the
* {@code ActorSystem}.
*
* @param actorSystem the actorSystem in which the {@code RootChildActorStarter} should be loaded.
* @return the {@code RootChildActorStarter} implementation.
* @throws NullPointerException if {@code actorSystem} is {@code null}.
*/
static EdgeCommandForwarderExtension get(final ActorSystem actorSystem) {
checkNotNull(actorSystem, "actorSystem");
final var extensionIdConfig = ExtensionId.computeConfig(actorSystem);
return DittoExtensionIds.get(actorSystem)
.computeIfAbsent(extensionIdConfig, ExtensionId::new)
.get(actorSystem);
}
/**
* Builds the receive extension to allow custom handling of messages.
* This receive will be applied BEFORE the default receives of {@link EdgeCommandForwarderActor}, so it's possible
* to overwrite the default handling.
*
* @param actorContext can be used for example to determine the original sender of a message.
* @return The desired receive extension.
*/
Receive getReceiveExtension(ActorContext actorContext);
final class ExtensionId extends DittoExtensionPoint.ExtensionId<EdgeCommandForwarderExtension> {
private static final String CONFIG_KEY = "edge-command-forwarder-extension";
private static final String CONFIG_PATH = "ditto.extensions." + CONFIG_KEY;
private ExtensionId(final ExtensionIdConfig<EdgeCommandForwarderExtension> extensionIdConfig) {
super(extensionIdConfig);
}
static ExtensionIdConfig<EdgeCommandForwarderExtension> computeConfig(final ActorSystem actorSystem) {
final Config extensions = ScopedConfig.getOrEmpty(actorSystem.settings().config(), "ditto.extensions");
return ExtensionIdConfig.of(EdgeCommandForwarderExtension.class, extensions, CONFIG_KEY);
}
@Override
protected String getConfigPath() {
return CONFIG_PATH;
}
}
}