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 java.util.function.Function;
  13 import javax.annotation.Nonnull;
  14 import org.opendaylight.openflowjava.protocol.api.connection.OutboundQueue;
  15 import org.opendaylight.openflowplugin.api.openflow.connection.OutboundQueueProvider;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.BarrierInput;
  17 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.BarrierInputBuilder;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.OfHeader;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 public class OutboundQueueProviderImpl implements OutboundQueueProvider {
  23     private static final Logger LOG = LoggerFactory.getLogger(OutboundQueueProviderImpl.class);
  24     private final short ofVersion;
  25     private volatile OutboundQueue outboundQueue;
  26
  27     public OutboundQueueProviderImpl(final short ofVersion) {
  28         this.ofVersion = ofVersion;
  29     }
  30
  31     @Nonnull
  32     @Override
  33     public BarrierInput createBarrierRequest(@Nonnull final Long xid) {
  34         final BarrierInputBuilder biBuilder = new BarrierInputBuilder();
  35         biBuilder.setVersion(ofVersion);
  36         biBuilder.setXid(xid);
  37         return biBuilder.build();
  38
  39     }
  40
  41     @Override
  42     public synchronized void onConnectionQueueChanged(final OutboundQueue queue) {
  43         LOG.debug("Replacing queue {} with {}", outboundQueue, queue);
  44         outboundQueue = queue;
  45         notifyAll();
  46     }
  47
  48     @Override
  49     public Long reserveEntry() {
  50         for (;;) {
  51             OutboundQueue queue = outboundQueue;
  52             if (queue == null) {
  53                 LOG.error("No queue present, failing request");
  54                 return null;
  55             }
  56
  57             final Long ret = queue.reserveEntry();
  58             if (ret != null) {
  59                 return ret;
  60             }
  61
  62             LOG.debug("Reservation failed, trying to recover");
  63             synchronized (this) {
  64                 while (queue.equals(outboundQueue)) {
  65                     LOG.debug("Queue {} is not replaced yet, going to sleep", queue);
  66                     try {
  67                         wait();
  68                     } catch (InterruptedException e) {
  69                         LOG.error("Interrupted while waiting for entry", e);
  70                         return null;
  71                     }
  72                 }
  73             }
  74         }
  75     }
  76
  77     @Override
  78     public void commitEntry(final Long xid, final OfHeader message, final FutureCallback<OfHeader> callback) {
  79         outboundQueue.commitEntry(xid, message, callback);
  80     }
  81
  82     @Override
  83     public void commitEntry(final Long xid, final OfHeader message, final FutureCallback<OfHeader> callback,
  84             final Function<OfHeader, Boolean> isComplete) {
  85         outboundQueue.commitEntry(xid, message, callback, isComplete);
  86     }
  87 }