Example
Flowable.range(1, 5)
.subscribe(new DefaultSubscriber<Integer>() {
@Override public void onStart() {
System.out.println("Start!");
request(1);
}
@Override public void onNext(Integer t) {
if (t == 3) {
cancel();
}
System.out.println(t);
request(1);
}
@Override public void onError(Throwable t) {
t.printStackTrace();
}
@Override public void onComplete() {
System.out.println("Done!");
}
});
Subscriber with
support for requesting via request(long), cancelling via
via cancel() (both synchronously) and calls onStart()
when the subscription happens.
All pre-implemented final methods are thread-safe.
The default onStart() requests Long#MAX_VALUE by default. Override
the method to request a custom positive amount.
Note that calling request(long) from onStart() may trigger
an immediate, asynchronous emission of data to onNext(Object). Make sure
all initialization happens before the call to request() in onStart().
Calling request(long) inside onNext(Object) can happen at any time
because by design, onNext calls from upstream are non-reentrant and non-overlapping.
Use the protected cancel() to cancel the sequence from within an
onNext implementation.
Like all other consumers, DefaultSubscriber can be subscribed only once.
Any subsequent attempt to subscribe it to a new source will yield an
IllegalStateException with message "It is not allowed to subscribe with a(n) <class name> multiple times.".
Implementation of onStart(), onNext(Object), onError(Throwable)
and onComplete() are not allowed to throw any unchecked exceptions.
If for some reason this can't be avoided, use io.
instead of the standard subscribe() method.
| Modifier and Type | Field and Description |
|---|---|
| pack-priv Subscription |
| Access | Constructor and Description |
|---|---|
| public |
| Modifier and Type | Method and Description |
|---|---|
| protected final void | |
| protected void | onStart()
Called once the subscription has been set on this observer; override this to perform initialization or issue an initial request. |
| public final void | onSubscribe(Subscription
the s)Subscription that allows requesting data via Subscription#request(long)Implements org. Publisher#subscribe(Subscriber).
|
| protected final void |
| upstream | back to summary |
|---|---|
| pack-priv Subscription upstream | |
| DefaultSubscriber | back to summary |
|---|---|
| public DefaultSubscriber() | |
| cancel | back to summary |
|---|---|
| protected final void cancel() Cancels the upstream's | |
| onStart | back to summary |
|---|---|
| protected void onStart() Called once the subscription has been set on this observer; override this to perform initialization or issue an initial request.
The default implementation requests | |
| onSubscribe | back to summary |
|---|---|
| public final void onSubscribe(Subscription s) Implements org. Doc from org. Invoked after calling
No data will start flowing until
It is the responsibility of this
The
| |
| request | back to summary |
|---|---|
| protected final void request(long n) Requests from the upstream
| |