/*
* Copyright 2011 Red Hat, Inc. and/or its affiliates.
*
* 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
package org.infinispan.commands.tx;
import org.infinispan.commands.write.WriteCommand;
import org.infinispan.container.versioning.EntryVersionsMap;
import org.infinispan.transaction.xa.GlobalTransaction;
import java.util.Arrays;
import java.util.List;
/**
* Same as {@link PrepareCommand} except that the transaction originator makes evident the versions of entries touched
* and stored in a transaction context so that accurate write skew checks may be performed by the lock owner(s).
*
* @author Manik Surtani
* @since 5.1
*/
public class VersionedPrepareCommand extends PrepareCommand {
public static final byte COMMAND_ID = 26;
private EntryVersionsMap versionsSeen = null;
public VersionedPrepareCommand() {
super("");
}
public VersionedPrepareCommand(String cacheName, GlobalTransaction gtx, List<WriteCommand> modifications, boolean onePhase) {
// VersionedPrepareCommands are *always* 2-phase, except when retrying a prepare.
super(cacheName, gtx, modifications, onePhase);
}
public VersionedPrepareCommand(String cacheName) {
super(cacheName);
}
public EntryVersionsMap getVersionsSeen() {
return versionsSeen;
}
public void setVersionsSeen(EntryVersionsMap versionsSeen) {
this.versionsSeen = versionsSeen;
}
@Override
public byte getCommandId() {
return COMMAND_ID;
}
@Override
public Object[] getParameters() {
int numMods = modifications == null ? 0 : modifications.length;
int i = 0;
final int params = 4;
Object[] retval = new Object[numMods + params];
retval[i++] = globalTx;
retval[i++] = onePhaseCommit;
retval[i++] = versionsSeen;
retval[i++] = numMods;
if (numMods > 0) System.arraycopy(modifications, 0, retval, params, numMods);
return retval;
}
@Override
@SuppressWarnings("unchecked")
public void setParameters(int commandId, Object[] args) {
int i = 0;
globalTx = (GlobalTransaction) args[i++];
onePhaseCommit = (Boolean) args[i++];
versionsSeen = (EntryVersionsMap) args[i++];
int numMods = (Integer) args[i++];
if (numMods > 0) {
modifications = new WriteCommand[numMods];
System.arraycopy(args, i, modifications, 0, numMods);
}
}
@Override
public boolean isReturnValueExpected() {
return true;
}
@Override
public String toString() {
return "VersionedPrepareCommand {" +
"modifications=" + getAffectedKeys() +
", onePhaseCommit=" + onePhaseCommit +
", versionsSeen=" + versionsSeen +
", gtx=" + globalTx.prettyPrint() +
", cacheName='" + cacheName + '\'' +
'}';
}
}