@Override
public void request(long n) {
if (once) {
return;
}
if (n < 0L) {
throw new IllegalStateException("n >= required but it was " + n);
}
if (n != 0L) {
once = true;
Subscriber<? super T> a = actual;
if (a.isUnsubscribed()) {
return;
}
T v = value;
try {
a.onNext(v);
} catch (Throwable e) {
Exceptions.throwOrReport(e, a, v);
return;
}
if (a.isUnsubscribed()) {
return;
}
a.onCompleted();
}
}
@Test
public void onErrorSuccessWithUnsubscribeFailure() {
AtomicReference<Throwable> onError = new AtomicReference<Throwable>();
Subscriber<String> o = OBSERVER_SUCCESS(onError);
try {
o.add(
Subscriptions.create(
new Action0() {
@Override
public void call() {
// break contract by throwing exception
throw new SafeObserverTestException("failure from unsubscribe");
}
}));
new SafeSubscriber<String>(o).onError(new SafeObserverTestException("failed"));
fail("we expect the unsubscribe failure to cause an exception to be thrown");
} catch (Exception e) {
e.printStackTrace();
assertTrue(o.isUnsubscribed());
// we still expect onError to have received something before unsubscribe blew up
assertNotNull(onError.get());
assertTrue(onError.get() instanceof SafeObserverTestException);
assertEquals("failed", onError.get().getMessage());
// now assert the exception that was thrown
assertTrue(e instanceof SafeObserverTestException);
assertEquals("failure from unsubscribe", e.getMessage());
}
}
@Test
public void onCompleteSuccessWithUnsubscribeFailure() {
Subscriber<String> o = OBSERVER_SUCCESS();
try {
o.add(
Subscriptions.create(
new Action0() {
@Override
public void call() {
// break contract by throwing exception
throw new SafeObserverTestException("failure from unsubscribe");
}
}));
new SafeSubscriber<String>(o).onCompleted();
fail("expects exception to be thrown");
} catch (Exception e) {
e.printStackTrace();
assertTrue(o.isUnsubscribed());
assertTrue(e instanceof SafeObserverTestException);
assertEquals("failure from unsubscribe", e.getMessage());
// expected since onError fails so SafeObserver can't help
}
}
@Override
public void call(Subscriber<? super Long> op) {
long l = 1;
while (!op.isUnsubscribed()) {
op.onNext(l++);
}
op.onCompleted();
}
@Override
public void call() {
Subscriber<? super T> a = actual;
if (a.isUnsubscribed()) {
return;
}
T v = value;
try {
a.onNext(v);
} catch (Throwable e) {
Exceptions.throwOrReport(e, a, v);
return;
}
if (a.isUnsubscribed()) {
return;
}
a.onCompleted();
}
@Override
public void onPreviewFrame(byte[] data) {
if (subscriber != null && !subscriber.isUnsubscribed() && rxCamera.isOpenCamera()) {
if (data == null || data.length == 0) {
subscriber.onError(new CameraDataNullException());
}
RxCameraData rxCameraData = new RxCameraData();
rxCameraData.cameraData = data;
rxCameraData.rotateMatrix = rxCamera.getRotateMatrix();
subscriber.onNext(rxCameraData);
}
}
private static void produceValuesAndAnError(Subscriber s) {
Subscriber subscriber = (Subscriber) s;
try {
for (int ii = 0; ii < 50; ii++) {
if (!subscriber.isUnsubscribed()) {
subscriber.onNext("Pushed value " + ii);
}
if (ii == 5) {
throw new Throwable("Something has gone wrong here");
}
}
if (!subscriber.isUnsubscribed()) {
subscriber.onCompleted();
}
} catch (Throwable throwable) {
subscriber.onError(throwable);
}
}
@Test
public void onErrorFailureWithUnsubscribeFailure() {
Subscriber<String> o = OBSERVER_ONERROR_FAIL();
try {
o.add(
Subscriptions.create(
new Action0() {
@Override
public void call() {
// break contract by throwing exception
throw new SafeObserverTestException("failure from unsubscribe");
}
}));
new SafeSubscriber<String>(o).onError(new SafeObserverTestException("onError failure"));
fail("expects exception to be thrown");
} catch (Exception e) {
e.printStackTrace();
assertTrue(o.isUnsubscribed());
// assertions for what is expected for the actual failure propagated to onError which then
// fails
assertTrue(e instanceof RuntimeException);
assertEquals(
"Error occurred when trying to propagate error to Observer.onError and during unsubscription.",
e.getMessage());
Throwable e2 = e.getCause();
assertTrue(e2 instanceof CompositeException);
assertEquals(
"Chain of Causes for CompositeException In Order Received =>",
e2.getCause().getMessage());
Throwable e3 = e2.getCause();
assertTrue(e3.getCause() instanceof SafeObserverTestException);
assertEquals("onError failure", e3.getCause().getMessage());
Throwable e4 = e3.getCause();
assertTrue(e4.getCause() instanceof SafeObserverTestException);
assertEquals("onErrorFail", e4.getCause().getMessage());
Throwable e5 = e4.getCause();
assertTrue(e5.getCause() instanceof SafeObserverTestException);
assertEquals("failure from unsubscribe", e5.getCause().getMessage());
}
}
private void init() {
// AndroidRx 再探
File[] folders = new File[5];
Observable.from(folders)
.flatMap(
new Func1<File, Observable<File>>() {
@Override
public Observable<File> call(File file) {
return Observable.from(file.listFiles());
}
})
.filter(
new Func1<File, Boolean>() {
@Override
public Boolean call(File file) {
return file.getName().endsWith(".png");
}
})
.map(
new Func1<File, Bitmap>() {
@Override
public Bitmap call(File file) {
return getBitmapFromFile(file);
}
})
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(
new Action1<Bitmap>() {
@Override
public void call(Bitmap bitmap) {
// 主线程处理
}
});
Observer<String> observer =
new Observer<String>() {
@Override
public void onCompleted() {}
@Override
public void onError(Throwable e) {}
@Override
public void onNext(String s) {}
};
// Observer 扩展类 Subscriber
// 区别 onStart()
Subscriber<String> subscriber =
new Subscriber<String>() {
@Override
public void onStart() {
super.onStart();
}
@Override
public void onCompleted() {}
@Override
public void onError(Throwable e) {}
@Override
public void onNext(String s) {}
};
subscriber.isUnsubscribed(); // 是否取消订阅
subscriber.unsubscribe(); // 取消订阅
Observable<String> observable =
Observable.create(
new Observable.OnSubscribe<String>() {
@Override
public void call(Subscriber<? super String> subscriber) {
subscriber.onStart();
subscriber.onNext("Hello");
subscriber.onNext("Hi");
subscriber.onCompleted();
}
});
observable.subscribe(observer); // 订阅
observable.subscribe(subscriber); // 同上，类似监听点击事件
// 应用一：
Observable.just(0, 1, 2, 3)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(
new Action1<Integer>() {
@Override
public void call(Integer integer) {
LogUtil.d(String.valueOf(integer));
}
});
// 应用二：
Observable.just(0)
.map(
new Func1<Integer, Drawable>() {
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public Drawable call(Integer integer) {
return getTheme().getDrawable(integer);
}
})
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(
new Observer<Drawable>() {
@Override
public void onCompleted() {}
@Override
public void onError(Throwable e) {
ToastManager.show(getBaseContext(), e.getMessage());
}
@Override
public void onNext(Drawable drawable) {
// TODO 显示内容
}
});
RxView.clickEvents(null)
.throttleFirst(500, TimeUnit.MILLISECONDS) // 防抖动
.subscribe(
new Action1<ViewClickEvent>() {
@Override
public void call(ViewClickEvent viewClickEvent) {}
});
}
void emitLoop() {
final Subscriber<? super T> c = child;
outer:
for (; ; ) {
long localRequested;
Producer localProducer;
Object localTerminal;
List<T> q;
synchronized (this) {
localRequested = missedRequested;
localProducer = missedProducer;
localTerminal = missedTerminal;
q = queue;
if (localRequested == 0L && localProducer == null && q == null && localTerminal == null) {
emitting = false;
return;
}
missedRequested = 0L;
missedProducer = null;
queue = null;
missedTerminal = null;
}
boolean empty = q == null || q.isEmpty();
if (localTerminal != null) {
if (localTerminal != Boolean.TRUE) {
c.onError((Throwable) localTerminal);
return;
} else if (empty) {
c.onCompleted();
return;
}
}
long e = 0;
if (q != null) {
for (T v : q) {
if (c.isUnsubscribed()) {
return;
} else if (hasError) {
continue outer; // if an error has been set, shortcut the loop and act on it
}
try {
c.onNext(v);
} catch (Throwable ex) {
Exceptions.throwOrReport(ex, c, v);
return;
}
}
e += q.size();
}
long r = requested;
// if requested is max, we don't do any accounting
if (r != Long.MAX_VALUE) {
// if there were missing requested, add it up
if (localRequested != 0L) {
long u = r + localRequested;
if (u < 0) {
u = Long.MAX_VALUE;
}
r = u;
}
// if there were emissions and we don't run on max since the last check, subtract
if (e != 0L && r != Long.MAX_VALUE) {
long u = r - e;
if (u < 0) {
throw new IllegalStateException("More produced than requested");
}
r = u;
}
requested = r;
}
if (localProducer != null) {
if (localProducer == NULL_PRODUCER) {
currentProducer = null;
} else {
currentProducer = localProducer;
if (r != 0L) {
localProducer.request(r);
}
}
} else {
Producer p = currentProducer;
if (p != null && localRequested != 0L) {
p.request(localRequested);
}
}
}
}
protected void drain() {
synchronized (this) {
if (emitting) {
missedEmitting++;
return;
}
emitting = true;
missedEmitting = 0;
}
final List<SourceSubscriber<T>.MergeItemSubscriber> subs = subscribers;
final Subscriber<T> child = s;
Object[] active = new Object[subs.size()];
do {
long r;
outer:
while ((r = requested) > 0) {
int idx = lastIndex;
synchronized (subs) {
if (subs.size() == active.length) {
active = subs.toArray(active);
} else {
active = subs.toArray();
}
}
int resumeIndex = 0;
int j = 0;
for (Object o : active) {
@SuppressWarnings("unchecked")
MergeItemSubscriber e = (MergeItemSubscriber) o;
if (e.index == idx) {
resumeIndex = j;
break;
}
j++;
}
int sumConsumed = 0;
for (int i = 0; i < active.length; i++) {
j = (i + resumeIndex) % active.length;
@SuppressWarnings("unchecked")
final MergeItemSubscriber e = (MergeItemSubscriber) active[j];
final RxRingBuffer b = e.buffer;
lastIndex = e.index;
if (!e.once && b.peek() == null) {
subs.remove(e);
synchronized (guard) {
this.active--;
}
csub.remove(e);
e.release();
subscribeNext();
WIP.decrementAndGet(this);
continue outer;
}
int consumed = 0;
Object v;
while (r > 0 && (v = b.poll()) != null) {
nl.accept(child, v);
if (child.isUnsubscribed()) {
return;
}
r--;
consumed++;
}
if (consumed > 0) {
sumConsumed += consumed;
REQUESTED.addAndGet(this, -consumed);
e.requestMore(consumed);
}
if (r == 0) {
break outer;
}
}
if (sumConsumed == 0) {
break;
}
}
if (active.length == 0) {
if (wip == 0) {
child.onCompleted();
return;
}
}
synchronized (this) {
if (missedEmitting == 0) {
emitting = false;
break;
}
missedEmitting = 0;
}
} while (true);
}
