/*
* JBoss, Home of Professional Open Source
* Copyright 2011 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 java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.Callable;
import org.infinispan.Cache;
import org.infinispan.commands.VisitableCommand;
import org.infinispan.commands.Visitor;
import org.infinispan.commands.CancellableCommand;
import org.infinispan.commands.remote.BaseRpcCommand;
import org.infinispan.context.InvocationContext;
import org.infinispan.distexec.DistributedCallable;
import org.infinispan.distexec.spi.DistributedTaskLifecycleService;
import org.infinispan.lifecycle.ComponentStatus;
import org.infinispan.util.InfinispanCollections;
/**
* DistributedExecuteCommand is used to migrate Callable and execute it in remote JVM.
*
* @author Vladimir Blagojevic
* @author Mircea Markus
* @since 5.0
*/
public class DistributedExecuteCommand<V> extends BaseRpcCommand implements VisitableCommand, CancellableCommand{
public static final int COMMAND_ID = 19;
private static final long serialVersionUID = -7828117401763700385L;
private Cache<Object, Object> cache;
private Set<Object> keys;
private Callable<V> callable;
private UUID uuid;
public DistributedExecuteCommand(String cacheName) {
this(cacheName, null, null);
}
public DistributedExecuteCommand(String cacheName, Collection<Object> inputKeys, Callable<V> callable) {
super(cacheName);
if (inputKeys == null || inputKeys.isEmpty())
this.keys = InfinispanCollections.emptySet();
else
this.keys = new HashSet<Object>(inputKeys);
this.callable = callable;
this.uuid = UUID.randomUUID();
}
public DistributedExecuteCommand() {
this(null, null, null);
}
public void init(Cache<Object, Object> cache) {
this.cache = cache;
}
@Override
public Object acceptVisitor(InvocationContext ctx, Visitor visitor) throws Throwable {
return visitor.visitDistributedExecuteCommand(ctx, this);
}
@Override
public boolean ignoreCommandOnStatus(ComponentStatus status) {
return false;
}
@Override
public boolean shouldInvoke(InvocationContext ctx) {
return true;
}
/**
* Performs invocation of Callable and returns result
*
* @param ctx
* invocation context
* @return result of Callable invocations
*/
@Override
public Object perform(InvocationContext context) throws Throwable {
// hook into lifecycle
DistributedTaskLifecycleService taskLifecycleService = DistributedTaskLifecycleService.getInstance();
Callable<V> callable = getCallable();
V result = null;
try {
taskLifecycleService.onPreExecute(callable, cache);
if (callable instanceof DistributedCallable<?, ?, ?>) {
DistributedCallable<Object, Object, Object> dc = (DistributedCallable<Object, Object, Object>) callable;
dc.setEnvironment(cache, keys);
}
result = callable.call();
} finally {
taskLifecycleService.onPostExecute(callable);
}
return result;
}
public Callable<V> getCallable() {
return callable;
}
public Set<Object> getKeys(){
return keys;
}
public boolean hasKeys(){
return keys.isEmpty();
}
@Override
public byte getCommandId() {
return COMMAND_ID;
}
@Override
public UUID getUUID() {
return uuid;
}
@Override
public Object[] getParameters() {
return new Object[] { keys, callable, uuid};
}
@Override
public void setParameters(int commandId, Object[] args) {
if (commandId != COMMAND_ID)
throw new IllegalStateException("Invalid method id");
int i = 0;
this.keys = (Set<Object>) args[i++];
this.callable = (Callable<V>) args[i++];
this.uuid = (UUID) args[i++];
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((keys == null) ? 0 : keys.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (!(obj instanceof DistributedExecuteCommand)) {
return false;
}
DistributedExecuteCommand other = (DistributedExecuteCommand) obj;
if (keys == null) {
if (other.keys != null) {
return false;
}
} else if (!keys.equals(other.keys)) {
return false;
}
return true;
}
@Override
public String toString() {
return "DistributedExecuteCommand [cache=" + cache + ", keys=" + keys + ", callable="
+ callable + "]";
}
@Override
public boolean isReturnValueExpected() {
return true;
}
}