io.reactivex.internal.operators.flowable.FlowableGenerate Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of rxjava Show documentation
Show all versions of rxjava Show documentation
Reactive Extensions for Java
/**
* 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.internal.operators.flowable;
import java.util.concurrent.Callable;
import java.util.concurrent.atomic.AtomicLong;
import org.reactivestreams.*;
import io.reactivex.*;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.*;
import io.reactivex.internal.subscriptions.*;
import io.reactivex.internal.util.BackpressureHelper;
import io.reactivex.plugins.RxJavaPlugins;
public final class FlowableGenerate extends Flowable {
final Callable stateSupplier;
final BiFunction, S> generator;
final Consumer super S> disposeState;
public FlowableGenerate(Callable stateSupplier, BiFunction, S> generator,
Consumer super S> disposeState) {
this.stateSupplier = stateSupplier;
this.generator = generator;
this.disposeState = disposeState;
}
@Override
public void subscribeActual(Subscriber super T> s) {
S state;
try {
state = stateSupplier.call();
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
EmptySubscription.error(e, s);
return;
}
s.onSubscribe(new GeneratorSubscription(s, generator, disposeState, state));
}
static final class GeneratorSubscription
extends AtomicLong
implements Emitter, Subscription {
private static final long serialVersionUID = 7565982551505011832L;
final Subscriber super T> downstream;
final BiFunction, S> generator;
final Consumer super S> disposeState;
S state;
volatile boolean cancelled;
boolean terminate;
boolean hasNext;
GeneratorSubscription(Subscriber super T> actual,
BiFunction, S> generator,
Consumer super S> disposeState, S initialState) {
this.downstream = actual;
this.generator = generator;
this.disposeState = disposeState;
this.state = initialState;
}
@Override
public void request(long n) {
if (!SubscriptionHelper.validate(n)) {
return;
}
if (BackpressureHelper.add(this, n) != 0L) {
return;
}
long e = 0L;
S s = state;
final BiFunction, S> f = generator;
for (;;) {
while (e != n) {
if (cancelled) {
state = null;
dispose(s);
return;
}
hasNext = false;
try {
s = f.apply(s, this);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
cancelled = true;
state = null;
onError(ex);
dispose(s);
return;
}
if (terminate) {
cancelled = true;
state = null;
dispose(s);
return;
}
e++;
}
n = get();
if (e == n) {
state = s;
n = addAndGet(-e);
if (n == 0L) {
break;
}
e = 0L;
}
}
}
private void dispose(S s) {
try {
disposeState.accept(s);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
RxJavaPlugins.onError(ex);
}
}
@Override
public void cancel() {
if (!cancelled) {
cancelled = true;
// if there are no running requests, just dispose the state
if (BackpressureHelper.add(this, 1) == 0) {
S s = state;
state = null;
dispose(s);
}
}
}
@Override
public void onNext(T t) {
if (!terminate) {
if (hasNext) {
onError(new IllegalStateException("onNext already called in this generate turn"));
} else {
if (t == null) {
onError(new NullPointerException("onNext called with null. Null values are generally not allowed in 2.x operators and sources."));
} else {
hasNext = true;
downstream.onNext(t);
}
}
}
}
@Override
public void onError(Throwable t) {
if (terminate) {
RxJavaPlugins.onError(t);
} else {
if (t == null) {
t = new NullPointerException("onError called with null. Null values are generally not allowed in 2.x operators and sources.");
}
terminate = true;
downstream.onError(t);
}
}
@Override
public void onComplete() {
if (!terminate) {
terminate = true;
downstream.onComplete();
}
}
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy