/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.waveprotocol.wave.client.scheduler;
import com.google.gwt.core.client.Duration;
import com.google.gwt.user.client.Timer;
/**
* GWT-based SimpleTimer implementation
*
* @author danilatos@google.com (Daniel Danilatos)
*/
public class GwtSimpleTimer implements SimpleTimer {
/**
* Factory for creating a GWT-based simple timer
*
* TODO(danilatos): Disallow creation of more than one timer, assuming its use
* will be in the one and only scheduler?
*/
public static final SimpleTimer.Factory FACTORY = new SimpleTimer.Factory() {
public SimpleTimer create(Runnable task) {
return new GwtSimpleTimer(task);
}
};
/** The GWT timer used */
private final Timer timer = new Timer() {
@Override
public void run() {
task.run();
}
};
/** The task to schedule */
private final Runnable task;
private GwtSimpleTimer(Runnable task) {
this.task = task;
}
/** {@inheritDoc} */
public double getTime() {
return Duration.currentTimeMillis();
}
/** {@inheritDoc} */
public void schedule() {
// NOTE(danilatos): 1 instead of 0, because of some assertion in GWT's Timer
// TODO(danilatos): Consider directly using setTimeout and not
// GWT's timer, or fixing GWT's timer? There are some browser-specific
// tunings in their implementation, so it doesn't make sense to just
// ignore it.
timer.schedule(1);
}
/** {@inheritDoc} */
public void cancel() {
timer.cancel();
}
/** {@inheritDoc} */
public void schedule(double when) {
int interval = (int) (when - getTime());
timer.schedule(interval >= 1 ? interval : 1);
}
}