+/*
+ * Copyright (c) 2017 Inocybe Technologies and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.cluster.common.actor;
+
+import akka.actor.ActorRef;
+import akka.actor.ActorSystem;
+import akka.dispatch.ControlMessage;
+import akka.dispatch.DequeBasedMessageQueueSemantics;
+import akka.dispatch.Envelope;
+import akka.dispatch.MailboxType;
+import akka.dispatch.ProducesMessageQueue;
+import akka.dispatch.UnboundedControlAwareMailbox;
+import com.codahale.metrics.Gauge;
+import com.typesafe.config.Config;
+import java.util.Deque;
+import java.util.Queue;
+import java.util.concurrent.ConcurrentLinkedDeque;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import scala.Option;
+
+/**
+ * An unbounded ControlAwareMailbox that also supports DequeBasedMessageQueueSemantics so it can be used with
+ * persistent actors which use stashing.
+ *
+ * @author Thomas Pantelis
+ */
+public class UnboundedDequeBasedControlAwareMailbox implements MailboxType,
+ ProducesMessageQueue<UnboundedDequeBasedControlAwareMailbox.MessageQueue> {
+ private static final Logger LOG = LoggerFactory.getLogger(UnboundedDequeBasedControlAwareMailbox.class);
+ private static final String NORMAL_QUEUE_SIZE = "normal-q-size";
+ private static final String CONTROL_QUEUE_SIZE = "control-q-size";
+ private static final String TOTAL_QUEUE_SIZE = "total-q-size";
+
+ public UnboundedDequeBasedControlAwareMailbox(ActorSystem.Settings settings, Config config) {
+ }
+
+ @Override
+ public MessageQueue create(Option<ActorRef> owner, Option<ActorSystem> system) {
+ LOG.debug("Creating MessageQueue for {}", owner);
+
+ final MessageQueue queue = new MessageQueue();
+
+ MeteredBoundedMailbox.registerMetric(owner, NORMAL_QUEUE_SIZE, (Gauge<Integer>) () -> queue.queue().size());
+ MeteredBoundedMailbox.registerMetric(owner, CONTROL_QUEUE_SIZE,
+ (Gauge<Integer>) () -> queue.controlQueue().size());
+ MeteredBoundedMailbox.registerMetric(owner, TOTAL_QUEUE_SIZE, (Gauge<Integer>) queue::numberOfMessages);
+
+ return queue;
+ }
+
+ static class MessageQueue extends UnboundedControlAwareMailbox.MessageQueue
+ implements DequeBasedMessageQueueSemantics {
+ private static final long serialVersionUID = 1L;
+
+ private final Deque<Envelope> controlQueue = new ConcurrentLinkedDeque<>();
+ private final Deque<Envelope> queue = new ConcurrentLinkedDeque<>();
+
+ @Override
+ public Queue<Envelope> controlQueue() {
+ return controlQueue;
+ }
+
+ @Override
+ public Queue<Envelope> queue() {
+ return queue;
+ }
+
+ @Override
+ public void enqueueFirst(ActorRef actor, Envelope envelope) {
+ final Object message = envelope.message();
+ LOG.debug("enqueueFirst: actor {}, message type: {}", actor, message.getClass());
+ if (message instanceof ControlMessage) {
+ LOG.debug("Adding {} to the ControlMessage queue", message.getClass());
+ controlQueue.addFirst(envelope);
+ } else {
+ LOG.debug("Adding {} to the normal queue", message.getClass());
+ queue.addFirst(envelope);
+ }
+ }
+ }
+}