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BlockedNamespacesUpdater.java
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BlockedNamespacesUpdater.java
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/*
* Copyright (c) 2017 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.namespaces;
import org.eclipse.ditto.base.model.exceptions.DittoInternalErrorException;
import org.eclipse.ditto.base.model.exceptions.DittoRuntimeException;
import org.eclipse.ditto.base.model.namespaces.signals.commands.BlockNamespace;
import org.eclipse.ditto.base.model.namespaces.signals.commands.BlockNamespaceResponse;
import org.eclipse.ditto.base.model.namespaces.signals.commands.UnblockNamespace;
import org.eclipse.ditto.base.model.namespaces.signals.commands.UnblockNamespaceResponse;
import org.eclipse.ditto.base.model.signals.commands.Command;
import org.eclipse.ditto.internal.utils.akka.logging.DittoLoggerFactory;
import org.eclipse.ditto.internal.utils.cluster.DistPubSubAccess;
import akka.actor.AbstractActor;
import akka.actor.ActorRef;
import akka.actor.Props;
import akka.cluster.pubsub.DistributedPubSubMediator;
import akka.event.DiagnosticLoggingAdapter;
import akka.japi.pf.ReceiveBuilder;
/**
* Actor which updates the distributed cache of blocked namespaces.
*/
public final class BlockedNamespacesUpdater extends AbstractActor {
/**
* The name of this actor.
*/
public static final String ACTOR_NAME = "blockedNamespacesUpdater";
private final DiagnosticLoggingAdapter log = DittoLoggerFactory.getDiagnosticLoggingAdapter(this);
private final BlockedNamespaces blockedNamespaces;
@SuppressWarnings("unused")
private BlockedNamespacesUpdater(final BlockedNamespaces blockedNamespaces, final ActorRef pubSubMediator) {
this.blockedNamespaces = blockedNamespaces;
// subscribe to namespace-blocking commands
pubSubMediator.tell(DistPubSubAccess.subscribe(BlockNamespace.TYPE, getSelf()), getSelf());
pubSubMediator.tell(DistPubSubAccess.subscribe(UnblockNamespace.TYPE, getSelf()), getSelf());
}
/**
* Creates {@code Props} for this Actor.
*
* @param blockedNamespaces the cache for blocked namespaces.
* @return the Props.
*/
public static Props props(final BlockedNamespaces blockedNamespaces, final ActorRef pubSubMediator) {
return Props.create(BlockedNamespacesUpdater.class, blockedNamespaces, pubSubMediator);
}
@Override
public Receive createReceive() {
return ReceiveBuilder.create()
.match(BlockNamespace.class, this::blockNamespace)
.match(UnblockNamespace.class, this::unblockNamespace)
.match(DistributedPubSubMediator.SubscribeAck.class, subscribeAck ->
log.info("Got SubscribeAck <{}>", subscribeAck))
.matchAny(message -> {
log.warning("Unhandled message <{}>", message);
unhandled(message);
})
.build();
}
private void blockNamespace(final BlockNamespace command) {
final String namespace = command.getNamespace();
final ActorRef sender = getSender();
final ActorRef self = getSelf();
blockedNamespaces.add(namespace)
.thenAccept(unused -> {
final var response = BlockNamespaceResponse.getInstance(namespace, command.getResourceType(),
command.getDittoHeaders());
sender.tell(response, self);
})
.exceptionally(error -> handleError(error, command, sender));
}
private void unblockNamespace(final UnblockNamespace command) {
final String namespace = command.getNamespace();
final ActorRef sender = getSender();
final ActorRef self = getSelf();
blockedNamespaces.remove(namespace)
.thenAccept(unused -> {
final var response = UnblockNamespaceResponse.getInstance(namespace, command.getResourceType(),
command.getDittoHeaders());
sender.tell(response, self);
})
.exceptionally(error -> handleError(error, command, sender));
}
private Void handleError(final Throwable error, final Command<?> command, final ActorRef sender) {
log.error(error, "Failed to perform <{}>", command);
final var message = DittoRuntimeException.asDittoRuntimeException(error, t ->
DittoInternalErrorException.newBuilder()
.message(error.getClass() + ": " + error.getMessage())
.dittoHeaders(command.getDittoHeaders())
.cause(t)
.build()
);
sender.tell(message, getSelf());
return null;
}
}