private void removeIntent(IntentService intentService, Intent intent) {
IntentListener listener = null;
Key key = intent.key();
final CountDownLatch withdrawLatch, purgeLatch;
if (purgeAfterRemove || sync) {
// set up latch and listener to track uninstall progress
withdrawLatch = new CountDownLatch(1);
purgeLatch = purgeAfterRemove ? new CountDownLatch(1) : null;
listener =
(IntentEvent event) -> {
if (Objects.equals(event.subject().key(), key)) {
if (event.type() == IntentEvent.Type.WITHDRAWN
|| event.type() == IntentEvent.Type.FAILED) {
withdrawLatch.countDown();
} else if (purgeAfterRemove && event.type() == IntentEvent.Type.PURGED) {
purgeLatch.countDown();
}
}
};
intentService.addListener(listener);
} else {
purgeLatch = null;
withdrawLatch = null;
}
// request the withdraw
intentService.withdraw(intent);
if (purgeAfterRemove || sync) {
try { // wait for withdraw event
withdrawLatch.await(5, TimeUnit.SECONDS);
} catch (InterruptedException e) {
print("Timed out waiting for intent {} withdraw", key);
}
// double check the state
IntentState state = intentService.getIntentState(key);
if (purgeAfterRemove && (state == WITHDRAWN || state == FAILED)) {
intentService.purge(intent);
}
if (sync) { // wait for purge event
/* TODO
Technically, the event comes before map.remove() is called.
If we depend on sync and purge working together, we will
need to address this.
*/
try {
purgeLatch.await(5, TimeUnit.SECONDS);
} catch (InterruptedException e) {
print("Timed out waiting for intent {} purge", key);
}
}
}
if (listener != null) {
// clean up the listener
intentService.removeListener(listener);
}
}
/**
* Uninstalls a single intent by Id.
*
* @param appId the Application ID
* @param keyString the Intent key value to look up
*/
@DELETE
@Path("{appId}/{key}")
public void deleteIntentById(
@PathParam("appId") String appId, @PathParam("key") String keyString) {
final ApplicationId app = get(CoreService.class).getAppId(appId);
Intent intent = get(IntentService.class).getIntent(Key.of(keyString, app));
IntentService service = get(IntentService.class);
if (intent == null) {
intent = service.getIntent(Key.of(Long.decode(keyString), app));
}
if (intent == null) {
// No such intent. REST standards recommend a positive status code
// in this case.
return;
}
Key key = intent.key();
// set up latch and listener to track uninstall progress
CountDownLatch latch = new CountDownLatch(1);
IntentListener listener = new DeleteListener(key, latch);
service.addListener(listener);
try {
// request the withdraw
service.withdraw(intent);
try {
latch.await(WITHDRAW_EVENT_TIMEOUT_SECONDS, TimeUnit.SECONDS);
} catch (InterruptedException e) {
log.info("REST Delete operation timed out waiting for intent {}", key);
}
// double check the state
IntentState state = service.getIntentState(key);
if (state == WITHDRAWN || state == FAILED) {
service.purge(intent);
}
} finally {
// clean up the listener
service.removeListener(listener);
}
}
