/**
* Copyright (c) 2016 Cisco Systems, Inc. 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.openflowplugin.applications.frsync.impl;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.Objects;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import javax.annotation.Nullable;
import org.opendaylight.openflowplugin.applications.frsync.SemaphoreKeeper;
import org.opendaylight.openflowplugin.applications.frsync.SyncReactor;
import org.opendaylight.openflowplugin.applications.frsync.util.PathUtil;
import org.opendaylight.openflowplugin.applications.frsync.util.SemaphoreKeeperGuavaImpl;
import org.opendaylight.openflowplugin.applications.frsync.util.SyncupEntry;
import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.FlowCapableNode;
import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeId;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Decorator for NodeId level syncup locking.
*/
public class SyncReactorGuardDecorator implements SyncReactor {
private static final Logger LOG = LoggerFactory.getLogger(SyncReactorGuardDecorator.class);
private final SyncReactor delegate;
private final SemaphoreKeeper<InstanceIdentifier<FlowCapableNode>> semaphoreKeeper =
new SemaphoreKeeperGuavaImpl<>(1, true);
public SyncReactorGuardDecorator(final SyncReactor delegate) {
this.delegate = delegate;
}
public ListenableFuture<Boolean> syncup(final InstanceIdentifier<FlowCapableNode> flowcapableNodePath,
final SyncupEntry syncupEntry) {
final NodeId nodeId = PathUtil.digNodeId(flowcapableNodePath);
final long stampBeforeGuard = System.nanoTime();
final Semaphore guard = semaphoreKeeper.summonGuardAndAcquire(flowcapableNodePath);
if (Objects.isNull(guard)) {
return Futures.immediateFuture(Boolean.FALSE);
}
final long stampAfterGuard = System.nanoTime();
if (LOG.isDebugEnabled()) {
LOG.debug("Syncup guard acquired and running for {} ", nodeId.getValue());
}
final ListenableFuture<Boolean> endResult = delegate.syncup(flowcapableNodePath, syncupEntry);
Futures.addCallback(endResult, createSyncupCallback(guard, stampBeforeGuard, stampAfterGuard, nodeId));
return endResult;
}
private FutureCallback<Boolean> createSyncupCallback(final Semaphore guard,
final long stampBeforeGuard,
final long stampAfterGuard,
final NodeId nodeId) {
return new FutureCallback<Boolean>() {
@Override
public void onSuccess(@Nullable final Boolean result) {
if (LOG.isDebugEnabled()) {
final long stampFinished = System.nanoTime();
LOG.debug("Syncup finished {} took:{} rpc:{} wait:{}", nodeId.getValue(),
formatNanos(stampFinished - stampBeforeGuard), formatNanos(stampFinished - stampAfterGuard),
formatNanos(stampAfterGuard - stampBeforeGuard));
}
semaphoreKeeper.releaseGuard(guard);
}
@Override
public void onFailure(final Throwable t) {
final long stampFinished = System.nanoTime();
LOG.warn("Syncup failed {} took:{} rpc:{} wait:{}", nodeId.getValue(),
formatNanos(stampFinished - stampBeforeGuard), formatNanos(stampFinished - stampAfterGuard),
formatNanos(stampAfterGuard - stampBeforeGuard));
semaphoreKeeper.releaseGuard(guard);
}};
}
private static String formatNanos(final long nanos) {
return "'" + TimeUnit.NANOSECONDS.toMillis(nanos) + " ms'";
}
}