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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 java.util.concurrent.atomic.AtomicInteger;
import net.jcip.annotations.Immutable;
import org.infinispan.client.hotrod.Flag;
import org.infinispan.client.hotrod.impl.VersionedOperationResponse;
import org.infinispan.client.hotrod.impl.protocol.Codec;
import org.infinispan.client.hotrod.impl.protocol.HeaderParams;
import org.infinispan.client.hotrod.impl.transport.Transport;
import org.infinispan.client.hotrod.impl.transport.TransportFactory;
import org.infinispan.util.Util;
import org.infinispan.util.logging.BasicLogFactory;
import org.jboss.logging.BasicLogger;
/**
* Basic class for all hot rod operations that manipulate a key.
*
* @author Mircea.Markus@jboss.com
* @since 4.1
*/
@Immutable
public abstract class AbstractKeyOperation extends RetryOnFailureOperation {
private static final BasicLogger log = BasicLogFactory.getLog(AbstractKeyOperation.class);
protected final byte[] key;
protected AbstractKeyOperation(Codec codec, TransportFactory transportFactory,
byte[] key, byte[] cacheName, AtomicInteger topologyId, Flag[] flags) {
super(codec, transportFactory, cacheName, topologyId, flags);
this.key = key;
}
@Override
protected Transport getTransport(int retryCount) {
if (retryCount == 0) {
return transportFactory.getTransport(key);
} else {
return transportFactory.getTransport();
}
}
protected short sendKeyOperation(byte[] key, Transport transport, byte opCode, byte opRespCode) {
// 1) write [header][key length][key]
HeaderParams params = writeHeader(transport, opCode);
transport.writeArray(key);
transport.flush();
// 2) now read the header
return readHeaderAndValidate(transport, params);
}
protected byte[] returnPossiblePrevValue(Transport transport) {
if (hasForceReturn(flags)) {
byte[] bytes = transport.readArray();
if (log.isTraceEnabled()) log.tracef("Previous value bytes is: %s", Util.printArray(bytes, false));
//0-length response means null
return bytes.length == 0 ? null : bytes;
} else {
return null;
}
}
private boolean hasForceReturn(Flag[] flags) {
if (flags == null) return false;
for (Flag flag : flags) {
if (flag == Flag.FORCE_RETURN_VALUE) return true;
}
return false;
}
protected VersionedOperationResponse returnVersionedOperationResponse(Transport transport, HeaderParams params) {
//3) ...
short respStatus = readHeaderAndValidate(transport, params);
//4 ...
VersionedOperationResponse.RspCode code;
if (respStatus == NO_ERROR_STATUS) {
code = VersionedOperationResponse.RspCode.SUCCESS;
} else if (respStatus == NOT_PUT_REMOVED_REPLACED_STATUS) {
code = VersionedOperationResponse.RspCode.MODIFIED_KEY;
} else if (respStatus == KEY_DOES_NOT_EXIST_STATUS) {
code = VersionedOperationResponse.RspCode.NO_SUCH_KEY;
} else {
throw new IllegalStateException("Unknown response status: " + Integer.toHexString(respStatus));
}
byte[] prevValue = returnPossiblePrevValue(transport);
return new VersionedOperationResponse(prevValue, code);
}
}