/*
* @(#)$Id: SchedulerFactory.java 3619 2008-03-26 07:23:03Z yui $
*
* Copyright 2006-2008 Makoto YUI
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.engine.sched;
import xbird.config.Settings;
import xbird.engine.ResponseListener;
import xbird.engine.backend.CommandProcessor;
import xbird.engine.backend.DistributedCompiler;
import xbird.engine.backend.PreparedQueryProcessor;
import xbird.engine.backend.QueryProcessor;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public final class SchedulerFactory {
private static final String DEFAULT_SCHED_POLICY = FIFOScheduler.FIFO;
private static final String SCHED_POLICY = Settings.get("xbird.sched.policy", DEFAULT_SCHED_POLICY);
private SchedulerFactory() {}
public static Scheduler createScheduler(ResponseListener resHandler) {
// create a scheduler
final ScheduledEventListener[] listeners = createListeners(resHandler);
final Scheduler sched;
if(FIFOScheduler.FIFO.equals(SCHED_POLICY)) {
sched = new FIFOScheduler(resHandler, listeners);
} else if(PriorityScheduler.PRIORITY.equals(SCHED_POLICY)) {
sched = new PriorityScheduler(resHandler, listeners);
} else if(ManagedFIFOScheduler.M_FIFO.equals(SCHED_POLICY)) {
sched = new ManagedFIFOScheduler(resHandler, listeners);
} else {
throw new IllegalStateException("Unsupported scheduring policy: " + SCHED_POLICY);
}
// TODO configure from file (listeners/interval/threadpool)
// run the scheduler in a separeted thread
sched.standby();
return sched;
}
private static ScheduledEventListener[] createListeners(ResponseListener resHandler) {
final ScheduledEventListener[] listeners = new ScheduledEventListener[4];
listeners[0] = new QueryProcessor(resHandler);
listeners[1] = new DistributedCompiler(resHandler);
listeners[2] = new PreparedQueryProcessor(resHandler);
listeners[3] = new CommandProcessor(resHandler);
//listeners[4] = new GridQueryTaskProcessor(resHandler);
return listeners;
}
}