protected long getNextScan(Subscription sub) {
SubscriptionHistory history = sub.getHistory();
Long fail_count = (Long) sub.getUserData(SCHEDULER_FAILED_SCAN_CONSEC_KEY);
if (fail_count != null) {
long fail_time = ((Long) sub.getUserData(SCHEDULER_FAILED_SCAN_TIME_KEY)).longValue();
long fails = fail_count.longValue();
long backoff = FAIL_INIT_DELAY;
for (int i = 1; i < fails; i++) {
backoff <<= 1;
if (backoff > FAIL_MAX_DELAY) {
backoff = FAIL_MAX_DELAY;
break;
}
}
return (fail_time + backoff);
}
return (history.getNextScanTime());
}
protected void schedule() {
Subscription[] subs = manager.getSubscriptions();
long now = SystemTime.getCurrentTime();
for (int i = 0; i < subs.length; i++) {
Subscription sub = subs[i];
if (!sub.isSubscribed()) {
continue;
}
SubscriptionHistory history = sub.getHistory();
if (!history.isEnabled()) {
continue;
}
synchronized (this) {
Long scan_due = (Long) sub.getUserData(SCHEDULER_NEXT_SCAN_KEY);
if (scan_due == null) {
continue;
}
long diff = now - scan_due.longValue();
if (diff < -10 * 1000) {
continue;
}
sub.setUserData(SCHEDULER_NEXT_SCAN_KEY, null);
}
long last_scan = history.getLastScanTime();
try {
download(sub, true);
} catch (Throwable e) {
} finally {
long new_last_scan = history.getLastScanTime();
if (new_last_scan == last_scan) {
scanFailed(sub);
} else {
scanSuccess(sub);
}
}
}
}
protected void calculateSchedule() {
Subscription[] subs = manager.getSubscriptions();
synchronized (this) {
if (!schedulng_permitted) {
return;
}
if (schedule_in_progress) {
return;
}
long next_ready_time = Long.MAX_VALUE;
for (int i = 0; i < subs.length; i++) {
Subscription sub = subs[i];
if (!sub.isSubscribed()) {
continue;
}
SubscriptionHistory history = sub.getHistory();
if (!history.isEnabled()) {
continue;
}
long next_scan = getNextScan(sub);
sub.setUserData(SCHEDULER_NEXT_SCAN_KEY, new Long(next_scan));
if (next_scan < next_ready_time) {
next_ready_time = next_scan;
}
}
long old_when = 0;
if (schedule_event != null) {
old_when = schedule_event.getWhen();
schedule_event.cancel();
schedule_event = null;
}
if (next_ready_time < Long.MAX_VALUE) {
long now = SystemTime.getCurrentTime();
if (now < last_schedule || now - last_schedule < 30 * 1000) {
if (next_ready_time - now < 30 * 1000) {
next_ready_time = now + 30 * 1000;
}
}
log(
"Calculate : "
+ "old_time="
+ new SimpleDateFormat().format(new Date(old_when))
+ ", new_time="
+ new SimpleDateFormat().format(new Date(next_ready_time)));
schedule_event =
SimpleTimer.addEvent(
"SS:Scheduler",
next_ready_time,
new TimerEventPerformer() {
public void perform(TimerEvent event) {
synchronized (SubscriptionSchedulerImpl.this) {
if (schedule_in_progress) {
return;
}
schedule_in_progress = true;
last_schedule = SystemTime.getCurrentTime();
schedule_event = null;
}
new AEThread2("SS:Sched", true) {
public void run() {
try {
schedule();
} finally {
synchronized (SubscriptionSchedulerImpl.this) {
schedule_in_progress = false;
}
calculateSchedule();
}
}
}.start();
}
});
}
}
}