/*
* JBoss, Home of Professional Open Source
* Copyright 2009 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.commands.read;
import org.infinispan.commands.VisitableCommand;
import org.infinispan.commands.Visitor;
import org.infinispan.container.DataContainer;
import org.infinispan.container.entries.CacheEntry;
import org.infinispan.context.InvocationContext;
/**
* Command to calculate the size of the cache
*
* @author Manik Surtani (<a href="mailto:manik@jboss.org">manik@jboss.org</a>)
* @author Mircea.Markus@jboss.com
* @author <a href="http://gleamynode.net/">Trustin Lee</a>
* @since 4.0
*/
public class SizeCommand extends AbstractLocalCommand implements VisitableCommand {
private final DataContainer container;
public SizeCommand(DataContainer container) {
this.container = container;
}
@Override
public Object acceptVisitor(InvocationContext ctx, Visitor visitor) throws Throwable {
return visitor.visitSizeCommand(ctx, this);
}
@Override
public Integer perform(InvocationContext ctx) throws Throwable {
if (noTxModifications(ctx)) {
return container.size(null);
}
int size = container.size(null);
for (CacheEntry e: ctx.getLookedUpEntries().values()) {
if (e.isCreated()) {
size ++;
} else if (e.isRemoved()) {
size --;
}
}
return Math.max(size, 0);
}
@Override
public String toString() {
return "SizeCommand{" +
"containerSize=" + container.size(null) +
'}';
}
}