/**
* Copyright 2003-2010 Terracotta, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.sf.ehcache.constructs.nonstop.concurrency;
import java.util.concurrent.Callable;
import net.sf.ehcache.config.NonstopConfiguration;
import net.sf.ehcache.constructs.nonstop.ClusterOperationCallable;
import net.sf.ehcache.constructs.nonstop.ThrowTimeoutException;
/**
*
* Callable used with nonstop when explicit lock has been acquired
*
* @author Abhishek Sanoujam
*
* @param <V>
*/
public class CacheOperationUnderExplicitLockCallable<V> implements Callable<V> {
private final Callable<V> cacheOperationCallable;
private final ExplicitLockingContext appThreadLockContext;
private final NonstopConfiguration nonstopConfiguration;
/**
* public constructor
*
* @param currentThreadLockContext
* @param nonstopConfiguration
* @param callable
*/
public CacheOperationUnderExplicitLockCallable(ExplicitLockingContext currentThreadLockContext,
NonstopConfiguration nonstopConfiguration, Callable<V> callable) {
appThreadLockContext = currentThreadLockContext;
this.nonstopConfiguration = nonstopConfiguration;
cacheOperationCallable = callable;
}
/**
* {@inheritDoc}
*/
public V call() throws Exception {
if (isExplicitLockApi()) {
// always invoke directly the explicit locking apis
return cacheOperationCallable.call();
}
if (appThreadLockContext.areLocksAcquiredByOtherThreads(NonstopThreadUniqueIdProvider.getCurrentNonstopThreadUniqueId())) {
// invalid lock state, some other thread has acquired explicit locks for the app thread corresponding
// to this nonstop thread, which can only be another nonstop thread before rejoin.
// Meaning rejoin happened and as locks are invalid after rejoin, throw exception if configured
switch (nonstopConfiguration.getTimeoutBehavior().getTimeoutBehaviorType()) {
case NOOP:
case LOCAL_READS:
// for noop and localReads, make the executor service rethrow as TimeoutException,
// so that appropriate action according to behavior can be done
throw new ThrowTimeoutException();
default:
// always throw InvalidLockStateAfterRejoinException for exception-on-timeout behavior
throw new InvalidLockStateAfterRejoinException();
}
} else {
return cacheOperationCallable.call();
}
}
private boolean isExplicitLockApi() {
return cacheOperationCallable instanceof ClusterOperationCallable
&& ((ClusterOperationCallable) cacheOperationCallable).getClusterOperation() instanceof ExplicitLockingClusterOperation;
}
}