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/*
 * 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.rxjava3.internal.disposables;

import java.util.concurrent.atomic.AtomicReferenceArray;

import io.reactivex.rxjava3.disposables.Disposable;

/**
 * A composite disposable with a fixed number of slots.
 *
 * 

Note that since the implementation leaks the methods of AtomicReferenceArray, one must be * careful to only call setResource, replaceResource and dispose on it. All other methods may lead to undefined behavior * and should be used by internal means only. */ public final class ArrayCompositeDisposable extends AtomicReferenceArray implements Disposable { private static final long serialVersionUID = 2746389416410565408L; public ArrayCompositeDisposable(int capacity) { super(capacity); } /** * Sets the resource at the specified index and disposes the old resource. * @param index the index of the resource to set * @param resource the new resource * @return true if the resource has ben set, false if the composite has been disposed */ public boolean setResource(int index, Disposable resource) { for (;;) { Disposable o = get(index); if (o == DisposableHelper.DISPOSED) { resource.dispose(); return false; } if (compareAndSet(index, o, resource)) { if (o != null) { o.dispose(); } return true; } } } /** * Replaces the resource at the specified index and returns the old resource. * @param index the index of the resource to replace * @param resource the new resource * @return the old resource, can be null */ public Disposable replaceResource(int index, Disposable resource) { for (;;) { Disposable o = get(index); if (o == DisposableHelper.DISPOSED) { resource.dispose(); return null; } if (compareAndSet(index, o, resource)) { return o; } } } @Override public void dispose() { if (get(0) != DisposableHelper.DISPOSED) { int s = length(); for (int i = 0; i < s; i++) { Disposable o = get(i); if (o != DisposableHelper.DISPOSED) { o = getAndSet(i, DisposableHelper.DISPOSED); if (o != DisposableHelper.DISPOSED && o != null) { o.dispose(); } } } } } @Override public boolean isDisposed() { return get(0) == DisposableHelper.DISPOSED; } }





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