opendaylight/md-sal/cds-access-client/src/main/java/org/opendaylight/controller/cluster/access/client/ConnectedClientConnection.java

   1 /*
   2  * Copyright (c) 2016 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.cluster.access.client;
   9
  10 import akka.actor.ActorRef;
  11 import com.google.common.annotations.Beta;
  12 import javax.annotation.concurrent.NotThreadSafe;
  13 import org.opendaylight.controller.cluster.access.concepts.RequestEnvelope;
  14 import org.slf4j.Logger;
  15 import org.slf4j.LoggerFactory;
  16
  17 @Beta
  18 @NotThreadSafe
  19 public final class ConnectedClientConnection<T extends BackendInfo> extends AbstractReceivingClientConnection<T> {
  20     private static final Logger LOG = LoggerFactory.getLogger(ConnectedClientConnection.class);
  21
  22     private long nextTxSequence;
  23
  24     public ConnectedClientConnection(final ClientActorContext context, final Long cookie, final T backend) {
  25         super(context, cookie, backend);
  26     }
  27
  28     private void transmit(final ConnectionEntry entry) {
  29         final long txSequence = nextTxSequence++;
  30
  31         final RequestEnvelope toSend = new RequestEnvelope(entry.getRequest().toVersion(remoteVersion()), sessionId(),
  32             txSequence);
  33
  34         // We need to enqueue the request before we send it to the actor, as we may be executing on a different thread
  35         // than the client actor thread, in which case the round-trip could be made faster than we can enqueue --
  36         // in which case the receive routine would not find the entry.
  37         final TransmittedConnectionEntry txEntry = new TransmittedConnectionEntry(entry, sessionId(), txSequence,
  38             readTime());
  39         appendToInflight(txEntry);
  40
  41         final ActorRef actor = remoteActor();
  42         LOG.trace("Transmitting request {} as {} to {}", entry.getRequest(), toSend, actor);
  43         actor.tell(toSend, ActorRef.noSender());
  44     }
  45
  46     @Override
  47     void enqueueEntry(final ConnectionEntry entry) {
  48         if (inflightSize() < remoteMaxMessages()) {
  49             transmit(entry);
  50             LOG.debug("Enqueued request {} to queue {}", entry.getRequest(), this);
  51         } else {
  52             LOG.debug("Queue is at capacity, delayed sending of request {}", entry.getRequest());
  53             super.enqueueEntry(entry);
  54         }
  55     }
  56
  57     @Override
  58     void sendMessages(final int count) {
  59         int toSend = count;
  60
  61         while (toSend > 0) {
  62             final ConnectionEntry e = dequeEntry();
  63             if (e == null) {
  64                 break;
  65             }
  66
  67             LOG.debug("Transmitting entry {}", e);
  68             transmit(e);
  69             toSend--;
  70         }
  71     }
  72
  73     @Override
  74     ClientActorBehavior<T> reconnectConnection(final ClientActorBehavior<T> current) {
  75         final ReconnectingClientConnection<T> next = new ReconnectingClientConnection<>(this);
  76         setForwarder(new SimpleReconnectForwarder(next));
  77         current.reconnectConnection(this, next);
  78         return current;
  79     }
  80 }