/*
* JBoss, Home of Professional Open Source
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* by the @authors tag. 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.commands.write;
import org.infinispan.commands.Visitor;
import org.infinispan.container.entries.MVCCEntry;
import org.infinispan.context.InvocationContext;
import org.infinispan.marshall.Ids;
import org.infinispan.marshall.Marshallable;
import org.infinispan.marshall.exts.ReplicableCommandExternalizer;
import org.infinispan.notifications.cachelistener.CacheNotifier;
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
/**
* @author Mircea.Markus@jboss.com
* @author <a href="mailto:galder.zamarreno@jboss.com">Galder Zamarreno</a>
* @since 4.0
*/
@Marshallable(externalizer = ReplicableCommandExternalizer.class, id = Ids.REMOVE_COMMAND)
public class RemoveCommand extends AbstractDataWriteCommand {
private static final Log log = LogFactory.getLog(RemoveCommand.class);
public static final byte COMMAND_ID = 10;
protected CacheNotifier notifier;
boolean successful = true;
boolean nonExistent = false;
/**
* When not null, value indicates that the entry should only be removed if the key is mapped to this value. By the
* time the RemoveCommand needs to be marshalled, the condition must have been true locally already, so there's no
* need to marshall the value. *
*/
protected transient Object value;
public RemoveCommand(Object key, Object value, CacheNotifier notifier) {
super(key);
this.value = value;
this.notifier = notifier;
}
public void init(CacheNotifier notifier) {
this.notifier = notifier;
}
public RemoveCommand() {
}
public Object acceptVisitor(InvocationContext ctx, Visitor visitor) throws Throwable {
return visitor.visitRemoveCommand(ctx, this);
}
public Object perform(InvocationContext ctx) throws Throwable {
MVCCEntry e = (MVCCEntry) ctx.lookupEntry(key);
if (e == null || e.isNull()) {
nonExistent = true;
log.trace("Nothing to remove since the entry is null or we have a null entry");
if (value == null) {
return null;
} else {
successful = false;
return false;
}
}
if (value != null && e.getValue() != null && !e.getValue().equals(value)) {
successful = false;
return false;
}
notify(ctx, e.getValue(), true);
e.setRemoved(true);
e.setValid(false);
notify(ctx, null, false);
return value == null ? e.getValue() : true;
}
protected void notify(InvocationContext ctx, Object value, boolean isPre) {
notifier.notifyCacheEntryRemoved(key, value, isPre, ctx);
}
public byte getCommandId() {
return COMMAND_ID;
}
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof RemoveCommand)) return false;
if (!super.equals(o)) return false;
RemoveCommand that = (RemoveCommand) o;
if (value != null ? !value.equals(that.value) : that.value != null) return false;
return true;
}
public int hashCode() {
int result = super.hashCode();
result = 31 * result + (value != null ? value.hashCode() : 0);
return result;
}
public String toString() {
return getClass().getSimpleName() + "{" +
"key=" + key +
", value=" + value +
'}';
}
public boolean isSuccessful() {
return successful;
}
public boolean isConditional() {
return value != null;
}
public boolean isNonExistent() {
return nonExistent;
}
}