/*
* JBoss, Home of Professional Open Source.
* Copyright 2014, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file 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.wildfly.clustering.server.dispatcher;
import java.security.AccessController;
import java.util.Arrays;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
import org.jboss.threads.JBossThreadFactory;
import org.jgroups.Address;
import org.jgroups.UnreachableException;
import org.wildfly.clustering.dispatcher.Command;
import org.wildfly.clustering.dispatcher.CommandDispatcher;
import org.wildfly.clustering.dispatcher.CommandResponse;
import org.wildfly.clustering.group.Node;
import org.wildfly.security.manager.action.GetAccessControlContextAction;
/**
* Non-clustered {@link CommandDispatcher} implementation
* @author Paul Ferraro
* @param <C> command context
*/
public class LocalCommandDispatcher<C> implements CommandDispatcher<C> {
final C context;
private final Node node;
private final ExecutorService executor;
public LocalCommandDispatcher(Node node, C context) {
this(node, context, Executors.newCachedThreadPool(createThreadFactory()));
}
private static ThreadFactory createThreadFactory() {
return new JBossThreadFactory(new ThreadGroup(LocalCommandDispatcher.class.getSimpleName()), Boolean.FALSE, null, "%G - %t", null, null, AccessController.doPrivileged(GetAccessControlContextAction.getInstance()));
}
public LocalCommandDispatcher(Node node, C context, ExecutorService executor) {
this.node = node;
this.context = context;
this.executor = executor;
}
@Override
public <R> CommandResponse<R> executeOnNode(Command<R, C> command, Node node) {
if (!this.node.equals(node)) {
throw new UnreachableException((Address) null);
}
try {
return new SimpleCommandResponse<>(command.execute(this.context));
} catch (Throwable e) {
return new SimpleCommandResponse<>(e);
}
}
@Override
public <R> Map<Node, CommandResponse<R>> executeOnCluster(Command<R, C> command, Node... excludedNodes) {
if ((excludedNodes != null) && (excludedNodes.length > 0) && Arrays.asList(excludedNodes).contains(this.node)) {
return Collections.emptyMap();
}
return Collections.singletonMap(this.node, this.executeOnNode(command, this.node));
}
@Override
public <R> Future<R> submitOnNode(final Command<R, C> command, Node node) {
Callable<R> task = new Callable<R>() {
@Override
public R call() throws Exception {
return command.execute(LocalCommandDispatcher.this.context);
}
};
return this.executor.submit(task);
}
@Override
public <R> Map<Node, Future<R>> submitOnCluster(Command<R, C> command, Node... excludedNodes) {
return Collections.singletonMap(this.node, this.submitOnNode(command, this.node));
}
@Override
public void close() {
this.executor.shutdown();
}
}