/*
* JBoss, Home of Professional Open Source.
* Copyright 2010, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.clustering.infinispan.invoker;
import static org.jboss.as.clustering.infinispan.InfinispanLogger.ROOT_LOGGER;
import static org.jboss.as.clustering.infinispan.InfinispanMessages.MESSAGES;
import java.util.Arrays;
import java.util.EnumSet;
import java.util.Set;
import org.infinispan.Cache;
import org.infinispan.context.Flag;
import org.infinispan.remoting.transport.jgroups.SuspectException;
import org.infinispan.util.concurrent.TimeoutException;
/**
* A cache invoker implementation that retries after a specified set of intervals upon timeout or suspect.
* If the invocation includes Flag.FAIL_SILENTLY, this will only be applied to the last attempt.
* @author Paul Ferraro
*/
public class RetryingCacheInvoker implements CacheInvoker {
private final CacheInvoker invoker;
private final int[] backOffIntervals;
/**
* Creates a new RetryingCacheInvoker.
*
* @param backOffIntervals specifies the sleep intervals between retries, and implicitly, the number of retries
*/
public RetryingCacheInvoker(int... backOffIntervals) {
this(new SimpleCacheInvoker(), backOffIntervals);
}
public RetryingCacheInvoker(CacheInvoker invoker, int... backOffIntervals) {
this.invoker = invoker;
this.backOffIntervals = backOffIntervals;
}
/**
* {@inheritDoc}
*
* @see org.jboss.as.clustering.infinispan.invoker.CacheInvoker#invoke(org.infinispan.Cache, org.jboss.as.clustering.infinispan.invoker.CacheInvoker.Operation)
*/
@Override
public <K, V, R> R invoke(Cache<K, V> cache, Operation<K, V, R> operation, Flag... allFlags) {
Flag[] attemptFlags = null;
// attemptFlags = allFlags - Flag.FAIL_SILENTLY
if ((allFlags != null) && (allFlags.length > 0)) {
Set<Flag> flags = EnumSet.noneOf(Flag.class);
flags.addAll(Arrays.asList(allFlags));
flags.remove(Flag.FAIL_SILENTLY);
attemptFlags = flags.toArray(new Flag[flags.size()]);
}
Exception exception = null;
for (int i = 0; i <= this.backOffIntervals.length; ++i) {
// Make sure Flag.FAIL_SILENTLY, if specified, is applied to the last try only
try {
return this.invoker.invoke(cache, operation, (i < this.backOffIntervals.length) ? attemptFlags : allFlags);
} catch (TimeoutException e) {
exception = e;
} catch (SuspectException e) {
exception = e;
}
if (i < this.backOffIntervals.length) {
int delay = this.backOffIntervals[i];
try {
if (ROOT_LOGGER.isTraceEnabled()) {
ROOT_LOGGER.tracef(exception, "Cache operation failed. Retrying in %d ms", Integer.valueOf(delay));
}
Thread.sleep(delay);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
}
throw MESSAGES.abortingCacheOperation(exception, Integer.valueOf(this.backOffIntervals.length + 1));
}
}