/*
* Schedule a task.
*/
private void scheduleImpl(TimerTask task, long delay, long period, boolean fixed) {
synchronized (impl) {
if (impl.cancelled) {
throw new IllegalStateException("luni.41"); // $NON-NLS-1$
}
long when = delay + System.currentTimeMillis();
if (when < 0) {
throw new IllegalArgumentException("luni.42"); // $NON-NLS-1$
}
synchronized (task.lock) {
if (task.isScheduled()) {
throw new IllegalStateException("luni.43"); // $NON-NLS-1$
}
if (task.cancelled) {
throw new IllegalStateException("luni.44"); // $NON-NLS-1$
}
task.when = when;
task.period = period;
task.fixedRate = fixed;
}
// insert the newTask into queue
impl.insertTask(task);
}
}
/** This method will be launched on separate thread for each Timer object. */
@Override
public void run() {
while (true) {
final TimerTask task;
synchronized (this) {
// need to check cancelled inside the synchronized block
if (cancelled) {
return;
}
if (tasks.isEmpty()) {
if (finished) {
return;
}
// no tasks scheduled -- sleep until any task appear
try {
this.wait();
} catch (InterruptedException ignored) {
}
continue;
}
long currentTime = System.currentTimeMillis();
task = tasks.minimum();
long timeToSleep;
synchronized (task.lock) {
if (task.cancelled) {
tasks.delete(0);
continue;
}
// check the time to sleep for the first task scheduled
timeToSleep = task.when - currentTime;
}
if (timeToSleep > 0) {
// sleep!
try {
this.wait(timeToSleep);
} catch (InterruptedException ignored) {
}
continue;
}
// no sleep is necessary before launching the task
synchronized (task.lock) {
int pos = 0;
if (tasks.minimum().when != task.when) {
pos = tasks.getTask(task);
}
if (task.cancelled) {
tasks.delete(tasks.getTask(task));
continue;
}
// set time to schedule
task.setScheduledTime(task.when);
// remove task from queue
tasks.delete(pos);
// set when the next task should be launched
if (task.period >= 0) {
// this is a repeating task,
if (task.fixedRate) {
// task is scheduled at fixed rate
task.when = task.when + task.period;
} else {
// task is scheduled at fixed delay
task.when = System.currentTimeMillis() + task.period;
}
// insert this task into queue
insertTask(task);
} else {
task.when = 0;
}
}
}
boolean taskCompletedNormally = false;
try {
task.run();
taskCompletedNormally = true;
} finally {
if (!taskCompletedNormally) {
synchronized (this) {
cancelled = true;
}
}
}
}
}
