/**
* Copyright 2009 Google Inc.
*
* 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.
*
*/
package org.waveprotocol.wave.client.scheduler;
import com.google.gwt.core.client.Duration;
import com.google.gwt.core.client.GWT;
import org.waveprotocol.wave.client.scheduler.Scheduler.IncrementalTask;
import org.waveprotocol.wave.client.scheduler.Scheduler.Priority;
import org.waveprotocol.wave.client.scheduler.Scheduler.Schedulable;
import org.waveprotocol.wave.client.scheduler.Scheduler.Task;
/**
* Implements a TimerService using the Wave client's Scheduler package.
*
*/
public class SchedulerTimerService implements TimerService {
/**
* Scheduler to use for scheduling tasks.
*/
private final Scheduler scheduler;
/**
* Priority jobs will be run at.
*/
private final Priority priority;
/**
* The start time of when SchedulerTimerService is created.
*/
private final double start = currentTimeMillis();
/**
* Creates a new TimerService that runs all tasks at LOW priority by default.
*
* @param scheduler Scheduler to use.
*/
public SchedulerTimerService(Scheduler scheduler) {
this(scheduler, Priority.LOW);
}
/**
* Creates a new TimerService that runs tasks at the given priority.
*
* @param scheduler Scheduler to use.
* @param priority Priority to run scheduled jobs at.
*/
public SchedulerTimerService(Scheduler scheduler, Priority priority) {
this.scheduler = scheduler;
this.priority = priority;
}
@Override
public void schedule(Task task) {
scheduler.schedule(priority, task);
}
@Override
public void schedule(IncrementalTask process) {
scheduler.schedule(priority, process);
}
@Override
public void scheduleDelayed(Task task, int minimumTime) {
scheduler.scheduleDelayed(priority, task, minimumTime);
}
@Override
public void scheduleDelayed(IncrementalTask process, int minimumTime) {
scheduler.scheduleDelayed(priority, process, minimumTime);
}
@Override
public void scheduleRepeating(IncrementalTask process, int minimumTime, int interval) {
scheduler.scheduleRepeating(priority, process, minimumTime, interval);
}
@Override
public void cancel(Schedulable job) {
scheduler.cancel(job);
}
@Override
public boolean isScheduled(Schedulable job) {
return scheduler.isScheduled(job);
}
@Override
public int elapsedMillis() {
return (int) (currentTimeMillis() - start);
}
@Override
public double currentTimeMillis() {
// Replace this with just Duration.currentTimeMillis() when it is itself
// implemented with a GWT.isClient() check.
return GWT.isClient()
? Duration.currentTimeMillis()
: System.currentTimeMillis();
}
}