2 * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
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
9 package org.opendaylight.openflowplugin.applications.frsync.impl;
11 import com.google.common.base.Preconditions;
12 import com.google.common.util.concurrent.FutureCallback;
13 import com.google.common.util.concurrent.Futures;
14 import com.google.common.util.concurrent.ListenableFuture;
15 import java.util.concurrent.Semaphore;
16 import java.util.concurrent.TimeUnit;
17 import javax.annotation.Nullable;
18 import org.opendaylight.openflowplugin.applications.frsync.SemaphoreKeeper;
19 import org.opendaylight.openflowplugin.applications.frsync.SyncReactor;
20 import org.opendaylight.openflowplugin.applications.frsync.util.PathUtil;
21 import org.opendaylight.openflowplugin.applications.frsync.util.SyncupEntry;
22 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.FlowCapableNode;
23 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeId;
24 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
25 import org.slf4j.Logger;
26 import org.slf4j.LoggerFactory;
29 * Decorator for NodeId level syncup locking.
31 public class SyncReactorGuardDecorator implements SyncReactor {
33 private static final Logger LOG = LoggerFactory.getLogger(SyncReactorGuardDecorator.class);
35 private final SyncReactor delegate;
36 private final SemaphoreKeeper<InstanceIdentifier<FlowCapableNode>> semaphoreKeeper;
38 public SyncReactorGuardDecorator(SyncReactor delegate,
39 SemaphoreKeeper<InstanceIdentifier<FlowCapableNode>> semaphoreKeeper) {
40 this.delegate = delegate;
41 this.semaphoreKeeper = semaphoreKeeper;
44 public ListenableFuture<Boolean> syncup(final InstanceIdentifier<FlowCapableNode> flowcapableNodePath,
45 final SyncupEntry syncupEntry) throws InterruptedException {
46 final NodeId nodeId = PathUtil.digNodeId(flowcapableNodePath);
47 LOG.trace("syncup guard decorator: {}", nodeId.getValue());
49 final long stampBeforeGuard = System.nanoTime();
50 final Semaphore guard = summonGuardAndAcquire(flowcapableNodePath);
52 return Futures.immediateFuture(false);
54 final long stampAfterGuard = System.nanoTime();
57 if (LOG.isDebugEnabled()) {
58 LOG.debug("syncup start {} waiting:{} guard:{} thread:{}", nodeId.getValue(),
59 formatNanos(stampAfterGuard - stampBeforeGuard),
63 final ListenableFuture<Boolean> endResult =
64 delegate.syncup(flowcapableNodePath, syncupEntry);
66 Futures.addCallback(endResult, createSyncupCallback(guard, stampBeforeGuard, stampAfterGuard, nodeId));
68 } catch (InterruptedException e) {
69 releaseGuardForNodeId(guard);
74 private static FutureCallback<Boolean> createSyncupCallback(final Semaphore guard,
75 final long stampBeforeGuard,
76 final long stampAfterGuard,
77 final NodeId nodeId) {
78 return new FutureCallback<Boolean>() {
80 public void onSuccess(@Nullable final Boolean result) {
81 if (LOG.isDebugEnabled()) {
82 final long stampFinished = System.nanoTime();
83 LOG.debug("syncup finished {} took:{} rpc:{} wait:{} guard:{} permits thread:{}", nodeId.getValue(),
84 formatNanos(stampFinished - stampBeforeGuard), formatNanos(stampFinished - stampAfterGuard),
85 formatNanos(stampAfterGuard - stampBeforeGuard), guard.availablePermits(), threadName());
87 releaseGuardForNodeId(guard);
90 public void onFailure(final Throwable t) {
91 final long stampFinished = System.nanoTime();
92 LOG.error("syncup failed {} took:{} rpc:{} wait:{} guard:{} permits thread:{}", nodeId.getValue(),
93 formatNanos(stampFinished - stampBeforeGuard), formatNanos(stampFinished - stampAfterGuard),
94 formatNanos(stampAfterGuard - stampBeforeGuard), guard.availablePermits(), threadName());
95 releaseGuardForNodeId(guard);
99 private static String formatNanos(long nanos) {
100 return "'" + TimeUnit.NANOSECONDS.toMillis(nanos) + " ms'";
104 * Get guard and lock for node.
105 * @param flowcapableNodePath II of node for which guard should be acquired
106 * @return semaphore guard
108 private Semaphore summonGuardAndAcquire(final InstanceIdentifier<FlowCapableNode> flowcapableNodePath) {
109 final NodeId nodeId = PathUtil.digNodeId(flowcapableNodePath);
110 final Semaphore guard = Preconditions.checkNotNull(semaphoreKeeper.summonGuard(flowcapableNodePath),
111 "no guard for " + nodeId.getValue());
114 } catch (InterruptedException e) {
115 LOG.error("syncup summon {} failed {}", nodeId.getValue(), e);
118 LOG.trace("syncup summon {} guard:{} thread:{}", nodeId.getValue(), guard, threadName());
123 * Unlock and release guard.
124 * @param guard semaphore guard which should be unlocked
126 private static void releaseGuardForNodeId(final Semaphore guard) {
129 LOG.trace("syncup release guard:{} thread:{}", guard, threadName());
133 private static String threadName() {
134 final Thread currentThread = Thread.currentThread();
135 return currentThread.getName();