openflowplugin-impl/src/main/java/org/opendaylight/openflowplugin/impl/connection/OutboundQueueProviderImpl.java

   1 /*
   2  * Copyright (c) 2015 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
   9 package org.opendaylight.openflowplugin.impl.connection;
  10
  11 import com.google.common.util.concurrent.FutureCallback;
  12 import javax.annotation.Nonnull;
  13 import org.opendaylight.openflowjava.protocol.api.connection.OutboundQueue;
  14 import org.opendaylight.openflowplugin.api.openflow.connection.OutboundQueueProvider;
  15 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.BarrierInput;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.BarrierInputBuilder;
  17 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.OfHeader;
  18 import org.slf4j.Logger;
  19 import org.slf4j.LoggerFactory;
  20
  21 /**
  22  * Created by Martin Bobak &lt;mbobak@cisco.com&gt; on 12.5.2015.
  23  */
  24 public class OutboundQueueProviderImpl implements OutboundQueueProvider {
  25     private static final Logger LOG = LoggerFactory.getLogger(OutboundQueueProviderImpl.class);
  26     private final short ofVersion;
  27     private volatile OutboundQueue outboundQueue;
  28
  29     public OutboundQueueProviderImpl(final short ofVersion) {
  30         this.ofVersion = ofVersion;
  31     }
  32
  33     @Nonnull
  34     @Override
  35     public BarrierInput createBarrierRequest(@Nonnull final Long xid) {
  36         final BarrierInputBuilder biBuilder = new BarrierInputBuilder();
  37         biBuilder.setVersion(ofVersion);
  38         biBuilder.setXid(xid);
  39         return biBuilder.build();
  40
  41     }
  42
  43     @Override
  44     public synchronized void onConnectionQueueChanged(final OutboundQueue queue) {
  45         LOG.debug("Replacing queue {} with {}", outboundQueue, queue);
  46         outboundQueue = queue;
  47         notifyAll();
  48     }
  49
  50     @Override
  51     public Long reserveEntry() {
  52         for (;;) {
  53             OutboundQueue queue = outboundQueue;
  54             if (queue == null) {
  55                 LOG.error("No queue present, failing request");
  56                 return null;
  57             }
  58
  59             final Long ret = queue.reserveEntry();
  60             if (ret != null) {
  61                 return ret;
  62             }
  63
  64             LOG.debug("Reservation failed, trying to recover");
  65             synchronized (this) {
  66                 while (queue.equals(outboundQueue)) {
  67                     LOG.debug("Queue {} is not replaced yet, going to sleep", queue);
  68                     try {
  69                         wait();
  70                     } catch (InterruptedException e) {
  71                         LOG.error("Interrupted while waiting for entry", e);
  72                         return null;
  73                     }
  74                 }
  75             }
  76         }
  77     }
  78
  79     @Override
  80     public void commitEntry(final Long xid, final OfHeader message, final FutureCallback<OfHeader> callback) {
  81         outboundQueue.commitEntry(xid, message, callback);
  82     }
  83 }