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/*
* Copyright (c) 2016-present, RxJava Contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
* the License for the specific language governing permissions and limitations under the License.
*/
package io.reactivex.rxjava3.internal.observers;
import java.util.concurrent.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.*;
import io.reactivex.rxjava3.internal.util.*;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
/**
* A combined Observer that awaits the success or error signal via a CountDownLatch.
* @param the value type
*/
public final class BlockingMultiObserver
extends CountDownLatch
implements SingleObserver, CompletableObserver, MaybeObserver {
T value;
Throwable error;
Disposable upstream;
volatile boolean cancelled;
public BlockingMultiObserver() {
super(1);
}
void dispose() {
cancelled = true;
Disposable d = this.upstream;
if (d != null) {
d.dispose();
}
}
@Override
public void onSubscribe(Disposable d) {
this.upstream = d;
if (cancelled) {
d.dispose();
}
}
@Override
public void onSuccess(T value) {
this.value = value;
countDown();
}
@Override
public void onError(Throwable e) {
error = e;
countDown();
}
@Override
public void onComplete() {
countDown();
}
/**
* Block until the latch is counted down then rethrow any exception received (wrapped if checked)
* or return the received value (null if none).
* @return the value received or null if no value received
*/
public T blockingGet() {
if (getCount() != 0) {
try {
BlockingHelper.verifyNonBlocking();
await();
} catch (InterruptedException ex) {
dispose();
throw ExceptionHelper.wrapOrThrow(ex);
}
}
Throwable ex = error;
if (ex != null) {
throw ExceptionHelper.wrapOrThrow(ex);
}
return value;
}
/**
* Block until the latch is counted down then rethrow any exception received (wrapped if checked)
* or return the received value (the defaultValue if none).
* @param defaultValue the default value to return if no value was received
* @return the value received or defaultValue if no value received
*/
public T blockingGet(T defaultValue) {
if (getCount() != 0) {
try {
BlockingHelper.verifyNonBlocking();
await();
} catch (InterruptedException ex) {
dispose();
throw ExceptionHelper.wrapOrThrow(ex);
}
}
Throwable ex = error;
if (ex != null) {
throw ExceptionHelper.wrapOrThrow(ex);
}
T v = value;
return v != null ? v : defaultValue;
}
/**
* Block until the observer terminates and return true; return false if
* the wait times out.
* @param timeout the timeout value
* @param unit the time unit
* @return true if the observer terminated in time, false otherwise
*/
public boolean blockingAwait(long timeout, TimeUnit unit) {
if (getCount() != 0) {
try {
BlockingHelper.verifyNonBlocking();
if (!await(timeout, unit)) {
dispose();
return false;
}
} catch (InterruptedException ex) {
dispose();
throw ExceptionHelper.wrapOrThrow(ex);
}
}
Throwable ex = error;
if (ex != null) {
throw ExceptionHelper.wrapOrThrow(ex);
}
return true;
}
/**
* Blocks until the source completes and calls the appropriate callback.
* @param onSuccess for a succeeding source
* @param onError for a failing source
* @param onComplete for an empty source
*/
public void blockingConsume(Consumer super T> onSuccess, Consumer super Throwable> onError, Action onComplete) {
try {
if (getCount() != 0) {
try {
BlockingHelper.verifyNonBlocking();
await();
} catch (InterruptedException ex) {
dispose();
onError.accept(ex);
return;
}
}
Throwable ex = error;
if (ex != null) {
onError.accept(ex);
return;
}
T v = value;
if (v != null) {
onSuccess.accept(v);
} else {
onComplete.run();
}
} catch (Throwable t) {
Exceptions.throwIfFatal(t);
RxJavaPlugins.onError(t);
}
}
}
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