package org.infinispan.client.hotrod.impl.operations;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.infinispan.client.hotrod.configuration.ClientIntelligence;
import org.infinispan.client.hotrod.impl.protocol.Codec;
import org.infinispan.client.hotrod.impl.protocol.HotRodConstants;
import org.infinispan.client.hotrod.impl.transport.Transport;
import org.infinispan.client.hotrod.impl.transport.TransportFactory;
import org.infinispan.client.hotrod.logging.LogFactory;
import org.jboss.logging.BasicLogger;
import net.jcip.annotations.Immutable;
/**
* Implements "putIfAbsent" operation as described in <a href="http://community.jboss.org/wiki/HotRodProtocol">Hot Rod
* protocol specification</a>.
*
* @author Mircea.Markus@jboss.com
* @since 4.1
*/
@Immutable
public class PutIfAbsentOperation<V> extends AbstractKeyValueOperation<V> {
private static final BasicLogger log = LogFactory.getLog(PutIfAbsentOperation.class);
private static final boolean trace = log.isTraceEnabled();
public PutIfAbsentOperation(Codec codec, TransportFactory transportFactory,
Object key, byte[] keyBytes, byte[] cacheName, AtomicInteger topologyId,
int flags, ClientIntelligence clientIntelligence, byte[] value, long lifespan,
TimeUnit lifespanTimeUnit, long maxIdleTime, TimeUnit maxIdleTimeUnit) {
super(codec, transportFactory, key, keyBytes, cacheName, topologyId, flags, clientIntelligence, value,
lifespan, lifespanTimeUnit, maxIdleTime, maxIdleTimeUnit);
}
@Override
protected V executeOperation(Transport transport) {
short status = sendPutOperation(transport, PUT_IF_ABSENT_REQUEST, PUT_IF_ABSENT_RESPONSE);
V previousValue = null;
if (HotRodConstants.isNotExecuted(status)) {
previousValue = returnPossiblePrevValue(transport, status);
if (trace) {
log.tracef("Returning from putIfAbsent: %s", previousValue);
}
}
return previousValue;
}
}