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Merge pull request #1281 from benjchristensen/composite-subscription-…
…performance Reduce Subscription Object Allocation
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109 changes: 109 additions & 0 deletions
109
rxjava-core/src/main/java/rx/subscriptions/ChainedSubscription.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| /** | ||
| * 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.subscriptions; | ||
|
|
||
| import java.util.ArrayList; | ||
| import java.util.Arrays; | ||
| import java.util.Collection; | ||
| import java.util.LinkedList; | ||
| import java.util.List; | ||
|
|
||
| import rx.Subscription; | ||
| import rx.exceptions.CompositeException; | ||
|
|
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| /** | ||
| * Subscription that represents a group of Subscriptions that are unsubscribed together. | ||
| * | ||
| * @see <a href="http://msdn.microsoft.com/en-us/library/system.reactive.disposables.compositedisposable(v=vs.103).aspx">Rx.Net equivalent CompositeDisposable</a> | ||
| */ | ||
| public final class ChainedSubscription implements Subscription { | ||
|
|
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| private List<Subscription> subscriptions; | ||
| private boolean unsubscribed = false; | ||
|
|
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| public ChainedSubscription() { | ||
| } | ||
|
|
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| public ChainedSubscription(final Subscription... subscriptions) { | ||
| this.subscriptions = new LinkedList<Subscription>(Arrays.asList(subscriptions)); | ||
| } | ||
|
|
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| @Override | ||
| public synchronized boolean isUnsubscribed() { | ||
| return unsubscribed; | ||
| } | ||
|
|
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| public void add(final Subscription s) { | ||
| Subscription unsubscribe = null; | ||
| synchronized (this) { | ||
| if (unsubscribed) { | ||
| unsubscribe = s; | ||
| } else { | ||
| if (subscriptions == null) { | ||
| subscriptions = new LinkedList<Subscription>(); | ||
| } | ||
| subscriptions.add(s); | ||
| } | ||
| } | ||
| if (unsubscribe != null) { | ||
| // call after leaving the synchronized block so we're not holding a lock while executing this | ||
| unsubscribe.unsubscribe(); | ||
| } | ||
| } | ||
|
|
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| @Override | ||
| public void unsubscribe() { | ||
| synchronized (this) { | ||
| if (unsubscribed) { | ||
| return; | ||
| } | ||
| unsubscribed = true; | ||
| } | ||
| // we will only get here once | ||
| unsubscribeFromAll(subscriptions); | ||
| } | ||
|
|
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| private static void unsubscribeFromAll(Collection<Subscription> subscriptions) { | ||
| if (subscriptions == null) { | ||
| return; | ||
| } | ||
| List<Throwable> es = null; | ||
| for (Subscription s : subscriptions) { | ||
| try { | ||
| s.unsubscribe(); | ||
| } catch (Throwable e) { | ||
| if (es == null) { | ||
| es = new ArrayList<Throwable>(); | ||
| } | ||
| es.add(e); | ||
| } | ||
| } | ||
| if (es != null) { | ||
| if (es.size() == 1) { | ||
| Throwable t = es.get(0); | ||
| if (t instanceof RuntimeException) { | ||
| throw (RuntimeException) t; | ||
| } else { | ||
| throw new CompositeException( | ||
| "Failed to unsubscribe to 1 or more subscriptions.", es); | ||
| } | ||
| } else { | ||
| throw new CompositeException( | ||
| "Failed to unsubscribe to 2 or more subscriptions.", es); | ||
| } | ||
| } | ||
| } | ||
| } |
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