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* Copyright 2010 Red Hat Inc. and/or its affiliates and other
* contributors as indicated by the @author tags. All rights reserved.
* See the copyright.txt 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.infinispan.client.hotrod.impl.operations;
import net.jcip.annotations.Immutable;
import org.infinispan.client.hotrod.Flag;
import org.infinispan.client.hotrod.exceptions.HotRodClientException;
import org.infinispan.client.hotrod.exceptions.RemoteNodeSuspecException;
import org.infinispan.client.hotrod.exceptions.TransportException;
import org.infinispan.client.hotrod.impl.protocol.Codec;
import org.infinispan.client.hotrod.impl.transport.Transport;
import org.infinispan.client.hotrod.impl.transport.TransportFactory;
import org.infinispan.client.hotrod.logging.Log;
import org.infinispan.client.hotrod.logging.LogFactory;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Base class for all the operations that need retry logic: if the operation fails due to connection problems, try with
* another available connection.
*
* @author Mircea.Markus@jboss.com
* @since 4.1
* @param T the return type of this operation
*/
@Immutable
public abstract class RetryOnFailureOperation<T> extends HotRodOperation {
private static final Log log = LogFactory.getLog(RetryOnFailureOperation.class, Log.class);
protected final TransportFactory transportFactory;
protected RetryOnFailureOperation(Codec codec, TransportFactory transportFactory,
byte[] cacheName, AtomicInteger topologyId, Flag[] flags) {
super(codec, flags, cacheName, topologyId);
this.transportFactory = transportFactory;
}
@Override
public T execute() {
int retryCount = 0;
while (shouldRetry(retryCount)) {
Transport transport = null;
try {
// Transport retrieval should be retried
transport = getTransport(retryCount);
return executeOperation(transport);
} catch (TransportException te) {
logErrorAndThrowExceptionIfNeeded(retryCount, te);
} catch (RemoteNodeSuspecException e) {
logErrorAndThrowExceptionIfNeeded(retryCount, e);
} finally {
releaseTransport(transport);
}
retryCount++;
}
throw new IllegalStateException("We should not reach here!");
}
protected boolean shouldRetry(int retryCount) {
return retryCount < transportFactory.getTransportCount();
}
protected void logErrorAndThrowExceptionIfNeeded(int i, HotRodClientException e) {
String message = "Exception encountered. Retry %d out of %d";
if (i >= transportFactory.getTransportCount() - 1 || transportFactory.getTransportCount() < 0) {
log.exceptionAndNoRetriesLeft(i,transportFactory.getTransportCount(), e);
throw e;
} else {
log.tracef(e, message, i, transportFactory.getTransportCount());
}
}
protected void releaseTransport(Transport transport) {
if (transport != null)
transportFactory.releaseTransport(transport);
}
protected abstract Transport getTransport(int retryCount);
protected abstract T executeOperation(Transport transport);
}