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AbstractActorWithShutdownBehavior.java
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AbstractActorWithShutdownBehavior.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.internal.utils.pekko.actors;
import static org.eclipse.ditto.base.model.common.ConditionChecker.checkNotNull;
import java.time.Duration;
import org.apache.pekko.actor.AbstractActor;
import org.apache.pekko.japi.pf.ReceiveBuilder;
import scala.PartialFunction;
/**
* Actor that handles commands during graceful shutdown.
*/
public abstract class AbstractActorWithShutdownBehavior extends AbstractActor {
/**
* Ask-timeout in shutdown tasks. Its duration should be long enough but ultimately does not matter because each
* shutdown phase has its own timeout.
*/
public static final Duration SHUTDOWN_ASK_TIMEOUT = Duration.ofMinutes(2L);
/**
* @return Actor's usual message handler. It will always be invoked in the actor's thread.
*/
protected abstract Receive handleMessage();
/**
* Handles necessary steps during the {@code CoordinatedShutdown.PhaseServiceUnbind()}.
*/
protected abstract void serviceUnbind(Control serviceUnbind);
/**
* Handles necessary steps during the {@code CoordinatedShutdown.PhaseServiceRequestsDone()}.
*/
protected abstract void serviceRequestsDone(Control serviceRequestsDone);
/**
* Switches the actor's message handler.
*
* @param receive the new message handler.
*/
protected void become(final Receive receive) {
getContext().become(shutdownBehavior(receive));
}
protected Receive shutdownBehavior(final Receive receive) {
checkNotNull(receive, "actor's message handler");
return ReceiveBuilder.create()
.matchEquals(Control.SERVICE_UNBIND, this::serviceUnbind)
.matchEquals(Control.SERVICE_REQUESTS_DONE, this::serviceRequestsDone)
.matchAny(message -> {
final PartialFunction<Object, ?> handler = receive.onMessage();
if (handler.isDefinedAt(message)) {
handler.apply(message);
} else {
unhandled(message);
}
})
.build();
}
@Override
public Receive createReceive() {
return shutdownBehavior(handleMessage());
}
public enum Control {
SERVICE_UNBIND,
SERVICE_REQUESTS_DONE
}
}