rx.internal.operators.OnSubscribeAutoConnect Maven / Gradle / Ivy
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/**
* Copyright 2014 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 rx.internal.operators;
import java.util.concurrent.atomic.AtomicInteger;
import rx.*;
import rx.Observable.OnSubscribe;
import rx.functions.Action1;
import rx.observables.ConnectableObservable;
import rx.observers.Subscribers;
/**
* Wraps a ConnectableObservable and calls its connect() method once
* the specified number of Subscribers have subscribed.
*
* @param the value type of the chain
*/
@SuppressWarnings("serial")
public final class OnSubscribeAutoConnect extends AtomicInteger implements OnSubscribe {
// AtomicInteger aspect of `this` represents the number of clients
final ConnectableObservable source;
final int numberOfSubscribers;
final Action1 connection;
public OnSubscribeAutoConnect(ConnectableObservable source,
int numberOfSubscribers,
Action1 connection) {
if (numberOfSubscribers <= 0) {
throw new IllegalArgumentException("numberOfSubscribers > 0 required");
}
this.source = source;
this.numberOfSubscribers = numberOfSubscribers;
this.connection = connection;
}
@Override
public void call(Subscriber child) {
source.unsafeSubscribe(Subscribers.wrap(child));
//this.get() represents the number of clients
if (this.incrementAndGet() == numberOfSubscribers) {
source.connect(connection);
}
}
}