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Burst.java
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126 lines (106 loc) · 3.94 KB
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/**
* Copyright 2016 Netflix, Inc.
*
* 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.flowable;
import java.util.Arrays;
import java.util.List;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicLong;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;
import io.reactivex.Flowable;
import io.reactivex.internal.subscriptions.SubscriptionHelper;
import io.reactivex.internal.util.BackpressureHelper;
/**
* Creates {@link Flowable} of a number of items followed by either an error or
* completion. Cancellation has no effect on preventing emissions until the
* currently outstanding requests have been met.
* @param <T> the value type
*/
public final class Burst<T> extends Flowable<T> {
private final List<T> items;
private final Throwable error;
private Burst(Throwable error, List<T> items) {
if (items.isEmpty()) {
throw new IllegalArgumentException("items cannot be empty");
}
for (T item : items) {
if (item == null) {
throw new IllegalArgumentException("items cannot include null");
}
}
this.error = error;
this.items = items;
}
@Override
protected void subscribeActual(final Subscriber<? super T> subscriber) {
subscriber.onSubscribe(new Subscription() {
final Queue<T> q = new ConcurrentLinkedQueue<T>(items);
final AtomicLong requested = new AtomicLong();
volatile boolean cancelled;
@Override
public void request(long n) {
if (cancelled) {
// required by reactive-streams-jvm 3.6
return;
}
if (SubscriptionHelper.validate(n)) {
// just for testing, don't care about perf
// so no attempt made to reduce volatile reads
if (BackpressureHelper.add(requested, n) == 0) {
if (q.isEmpty()) {
return;
}
while (!q.isEmpty() && requested.get() > 0) {
T item = q.poll();
requested.decrementAndGet();
subscriber.onNext(item);
}
if (q.isEmpty()) {
if (error != null) {
subscriber.onError(error);
} else {
subscriber.onComplete();
}
}
}
}
}
@Override
public void cancel() {
cancelled = true;
}
});
}
@SuppressWarnings("unchecked")
public static <T> Builder<T> item(T item) {
return items(item);
}
public static <T> Builder<T> items(T... items) {
return new Builder<T>(Arrays.asList(items));
}
public static final class Builder<T> {
private final List<T> items;
private Throwable error;
private Builder(List<T> items) {
this.items = items;
}
public Flowable<T> error(Throwable e) {
this.error = e;
return create();
}
public Flowable<T> create() {
return new Burst<T>(error, items);
}
}
}