/**
* Copyright 2015 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;
import org.reactivestreams.*;
import io.reactivex.internal.subscriptions.SubscriptionHelper;
public abstract class Observer implements Subscriber {
private Subscription s;
@Override
public final void onSubscribe(Subscription s) {
if (SubscriptionHelper.validateSubscription(this.s, s)) {
return;
}
this.s = s;
onStart();
}
protected final Subscription subscription() {
return s;
}
protected final void request(long n) {
subscription().request(n);
}
protected final void cancel() {
subscription().cancel();
}
/**
* Called once the subscription has been set on this observer; override this
* to perform initialization or issue an initial request.
*