use of rx.Observable.OnSubscribe in project sqlbrite by square.
the class BriteContentResolver method createQuery.
/**
* Create an observable which will notify subscribers with a {@linkplain Query query} for
* execution. Subscribers are responsible for <b>always</b> closing {@link Cursor} instance
* returned from the {@link Query}.
* <p>
* Subscribers will receive an immediate notification for initial data as well as subsequent
* notifications for when the supplied {@code uri}'s data changes. Unsubscribe when you no longer
* want updates to a query.
* <p>
* Since content resolver triggers are inherently asynchronous, items emitted from the returned
* observable use the {@link Scheduler} supplied to {@link SqlBrite#wrapContentProvider}. For
* consistency, the immediate notification sent on subscribe also uses this scheduler. As such,
* calling {@link Observable#subscribeOn subscribeOn} on the returned observable has no effect.
* <p>
* Note: To skip the immediate notification and only receive subsequent notifications when data
* has changed call {@code skip(1)} on the returned observable.
* <p>
* <b>Warning:</b> this method does not perform the query! Only by subscribing to the returned
* {@link Observable} will the operation occur.
*
* @see ContentResolver#query(Uri, String[], String, String[], String)
* @see ContentResolver#registerContentObserver(Uri, boolean, ContentObserver)
*/
@CheckResult
@NonNull
public QueryObservable createQuery(@NonNull final Uri uri, @Nullable final String[] projection, @Nullable final String selection, @Nullable final String[] selectionArgs, @Nullable final String sortOrder, final boolean notifyForDescendents) {
final Query query = new Query() {
@Override
public Cursor run() {
long startNanos = nanoTime();
Cursor cursor = contentResolver.query(uri, projection, selection, selectionArgs, sortOrder);
if (logging) {
long tookMillis = NANOSECONDS.toMillis(nanoTime() - startNanos);
log("QUERY (%sms)\n uri: %s\n projection: %s\n selection: %s\n selectionArgs: %s\n " + "sortOrder: %s\n notifyForDescendents: %s", tookMillis, uri, Arrays.toString(projection), selection, Arrays.toString(selectionArgs), sortOrder, notifyForDescendents);
}
return cursor;
}
};
OnSubscribe<Query> subscribe = new OnSubscribe<Query>() {
@Override
public void call(final Subscriber<? super Query> subscriber) {
final ContentObserver observer = new ContentObserver(contentObserverHandler) {
@Override
public void onChange(boolean selfChange) {
subscriber.onNext(query);
}
};
contentResolver.registerContentObserver(uri, notifyForDescendents, observer);
subscriber.add(Subscriptions.create(new Action0() {
@Override
public void call() {
contentResolver.unregisterContentObserver(observer);
}
}));
// Trigger initial query.
subscriber.onNext(query);
}
};
final Observable<Query> queryObservable = //
Observable.create(subscribe).onBackpressureLatest().observeOn(//
scheduler).compose(// Apply the user's query transformer.
queryTransformer).onBackpressureLatest();
// TODO switch to .to() when non-@Experimental
return new QueryObservable(new OnSubscribe<Query>() {
@Override
public void call(Subscriber<? super Query> subscriber) {
queryObservable.unsafeSubscribe(subscriber);
}
});
}
use of rx.Observable.OnSubscribe in project Hystrix by Netflix.
the class HystrixObservableCommandTest method testRequestContextOnTimeout.
private RequestContextTestResults testRequestContextOnTimeout(ExecutionIsolationStrategy isolation, final Scheduler userScheduler) {
final RequestContextTestResults results = new RequestContextTestResults();
TestHystrixObservableCommand<Boolean> command = new TestHystrixObservableCommand<Boolean>(TestHystrixObservableCommand.testPropsBuilder(new TestCircuitBreaker()).setCommandPropertiesDefaults(HystrixCommandPropertiesTest.getUnitTestPropertiesSetter().withExecutionIsolationStrategy(isolation).withExecutionTimeoutInMilliseconds(50))) {
@Override
protected Observable<Boolean> construct() {
return Observable.create(new OnSubscribe<Boolean>() {
@Override
public void call(Subscriber<? super Boolean> s) {
results.isContextInitialized.set(HystrixRequestContext.isCurrentThreadInitialized());
results.originThread.set(Thread.currentThread());
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// ignore the interrupted exception
}
}
}).subscribeOn(userScheduler);
}
};
results.command = command;
command.toObservable().doOnEach(new Action1<Notification<? super Boolean>>() {
@Override
public void call(Notification<? super Boolean> n) {
results.isContextInitializedObserveOn.set(HystrixRequestContext.isCurrentThreadInitialized());
results.observeOnThread.set(Thread.currentThread());
}
}).subscribe(results.ts);
results.ts.awaitTerminalEvent();
System.out.println("Run => Initialized: " + results.isContextInitialized.get() + " Thread: " + results.originThread.get());
System.out.println("Observed => Initialized: " + results.isContextInitializedObserveOn.get() + " Thread: " + results.observeOnThread.get());
assertEquals(1, results.ts.getOnErrorEvents().size());
assertTrue(command.getExecutionTimeInMilliseconds() > -1);
assertFalse(command.isSuccessfulExecution());
assertTrue(command.isResponseTimedOut());
assertCommandExecutionEvents(command, HystrixEventType.TIMEOUT, HystrixEventType.FALLBACK_MISSING);
assertEquals(0, command.metrics.getCurrentConcurrentExecutionCount());
assertSaneHystrixRequestLog(1);
return results;
}
use of rx.Observable.OnSubscribe in project Hystrix by Netflix.
the class HystrixObservableCommandTest method testRequestContextOnBadFailure.
private RequestContextTestResults testRequestContextOnBadFailure(ExecutionIsolationStrategy isolation, final Scheduler userScheduler) {
final RequestContextTestResults results = new RequestContextTestResults();
TestHystrixObservableCommand<Boolean> command = new TestHystrixObservableCommand<Boolean>(TestHystrixObservableCommand.testPropsBuilder(new TestCircuitBreaker()).setCommandPropertiesDefaults(HystrixCommandPropertiesTest.getUnitTestPropertiesSetter().withExecutionIsolationStrategy(isolation))) {
@Override
protected Observable<Boolean> construct() {
return Observable.create(new OnSubscribe<Boolean>() {
@Override
public void call(Subscriber<? super Boolean> s) {
results.isContextInitialized.set(HystrixRequestContext.isCurrentThreadInitialized());
results.originThread.set(Thread.currentThread());
throw new RuntimeException("bad onError");
}
}).subscribeOn(userScheduler);
}
};
results.command = command;
command.toObservable().doOnEach(new Action1<Notification<? super Boolean>>() {
@Override
public void call(Notification<? super Boolean> n) {
results.isContextInitializedObserveOn.set(HystrixRequestContext.isCurrentThreadInitialized());
results.observeOnThread.set(Thread.currentThread());
}
}).subscribe(results.ts);
results.ts.awaitTerminalEvent();
System.out.println("Run => Initialized: " + results.isContextInitialized.get() + " Thread: " + results.originThread.get());
System.out.println("Observed => Initialized: " + results.isContextInitializedObserveOn.get() + " Thread: " + results.observeOnThread.get());
assertEquals(1, results.ts.getOnErrorEvents().size());
assertTrue(command.getExecutionTimeInMilliseconds() > -1);
assertFalse(command.isSuccessfulExecution());
assertTrue(command.isFailedExecution());
assertCommandExecutionEvents(command, HystrixEventType.FAILURE, HystrixEventType.FALLBACK_MISSING);
assertEquals(0, command.metrics.getCurrentConcurrentExecutionCount());
assertSaneHystrixRequestLog(1);
return results;
}
Aggregations