public void run() {
while (stillAlive.get()) {
synchronized (this) {
try {
ScheduledJob job = schedule.peek();
if (job == null) {
// If null, wake up every minute or so to see if there's something to do.
// Most likely there will not be.
try {
this.wait(TIMEOUT_MS);
} catch (InterruptedException e) {
// interruption should occur when items are added or removed from the queue.
}
} else {
// We've passed the job execution time, so we will run.
if (!job.getScheduledExecution().isAfterNow()) {
// Run job. The invocation of jobs should be quick.
ScheduledJob runningJob = schedule.poll();
logger.info("Scheduler attempting to run " + runningJob.getId());
// Execute the job here
try {
executionManager.execute(runningJob.getId(), runningJob.isDependencyIgnored());
} catch (JobExecutionException e) {
logger.info("Could not run job. " + e.getMessage());
}
// Immediately reschedule if it's possible. Let the execution manager
// handle any duplicate runs.
if (runningJob.updateTime()) {
schedule.add(runningJob);
saveSchedule();
} else {
// No need to keep it in the schedule.
removeScheduledJob(runningJob);
}
} else {
// wait until job run
long millisWait =
Math.max(
0, job.getScheduledExecution().getMillis() - (new DateTime()).getMillis());
try {
this.wait(Math.min(millisWait, TIMEOUT_MS));
} catch (InterruptedException e) {
// interruption should occur when items are added or removed from the queue.
}
}
}
} catch (Exception e) {
logger.error("Unexpected exception has been thrown in scheduler", e);
} catch (Throwable e) {
logger.error("Unexpected throwable has been thrown in scheduler", e);
}
}
}
}
private void handleMeasurement() {
if (!userConsented()) {
Logger.i("Skipping measurement - User has not consented");
return;
}
try {
MeasurementTask task = taskQueue.peek();
// Process the head of the queue.
if (task != null && task.timeFromExecution() <= 0) {
taskQueue.poll();
Future<MeasurementResult> future;
Logger.i("Processing task " + task.toString());
// Run the head task using the executor
if (task.getDescription().priority == MeasurementTask.USER_PRIORITY) {
sendStringMsg("Scheduling user task:\n" + task);
// User task can override the power policy. So a different task wrapper is used.
future = measurementExecutor.submit(new UserMeasurementTask(task));
} else {
sendStringMsg("Scheduling task:\n" + task);
future = measurementExecutor.submit(new PowerAwareTask(task, powerManager, this));
}
synchronized (pendingTasks) {
pendingTasks.put(task, future);
}
MeasurementDesc desc = task.getDescription();
long newStartTime = desc.startTime.getTime() + (long) desc.intervalSec * 1000;
// Add a clone of the task if it's still valid.
if (newStartTime < desc.endTime.getTime()
&& (desc.count == MeasurementTask.INFINITE_COUNT || desc.count > 1)) {
MeasurementTask newTask = task.clone();
if (desc.count != MeasurementTask.INFINITE_COUNT) {
newTask.getDescription().count--;
}
newTask.getDescription().startTime.setTime(newStartTime);
submitTask(newTask);
}
}
// Schedule the next measurement in the taskQueue
task = taskQueue.peek();
if (task != null) {
long timeFromExecution =
Math.max(task.timeFromExecution(), Config.MIN_TIME_BETWEEN_MEASUREMENT_ALARM_MSEC);
measurementIntentSender =
PendingIntent.getBroadcast(
this,
0,
new UpdateIntent("", UpdateIntent.MEASUREMENT_ACTION),
PendingIntent.FLAG_CANCEL_CURRENT);
alarmManager.set(
AlarmManager.RTC_WAKEUP,
System.currentTimeMillis() + timeFromExecution,
measurementIntentSender);
}
} catch (IllegalArgumentException e) {
// Task creation in clone can create this exception
Logger.e("Exception when cloning task");
sendStringMsg("Exception when cloning task: " + e);
} catch (Exception e) {
// We don't want any unexpected exception to crash the process
Logger.e("Exception when handling measurements", e);
sendStringMsg("Exception running task: " + e);
}
persistState();
}