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* 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.write;
import org.infinispan.commands.FlagAffectedCommand;
import org.infinispan.commands.VisitableCommand;
import java.util.Set;
/**
* A command that modifies the cache in some way
*
* @author Manik Surtani
* @since 4.0
*/
public interface WriteCommand extends VisitableCommand, FlagAffectedCommand {
/**
* Some commands may want to provide information on whether the command was successful or not. This is different
* from a failure, which usually would result in an exception being thrown. An example is a putIfAbsent() not doing
* anything because the key in question was present. This would result in a isSuccessful() call returning false.
*
* @return true if the command completed successfully, false otherwise.
*/
boolean isSuccessful();
/**
* Certain commands only work based on a certain condition or state of the cache. For example, {@link
* org.infinispan.Cache#putIfAbsent(Object, Object)} only does anything if a condition is met, i.e., the entry in
* question is not already present. This method tests whether the command in question is conditional or not.
*
* @return true if the command is conditional, false otherwise
*/
boolean isConditional();
/**
*
* @return a collection of keys affected by this write command. Some commands - such as ClearCommand - may return
* an empty collection for this method.
*/
Set<Object> getAffectedKeys();
}