1 /*
2 * Copyright 2014 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16
17 package io.netty.util.concurrent;
18
19 import io.netty.util.internal.ObjectUtil;
20
21 import java.util.LinkedHashSet;
22 import java.util.Set;
23
24 /**
25 * @deprecated Use {@link PromiseCombiner#PromiseCombiner(EventExecutor)}.
26 *
27 * {@link GenericFutureListener} implementation which consolidates multiple {@link Future}s
28 * into one, by listening to individual {@link Future}s and producing an aggregated result
29 * (success/failure) when all {@link Future}s have completed.
30 *
31 * @param <V> the type of value returned by the {@link Future}
32 * @param <F> the type of {@link Future}
33 */
34 @Deprecated
35 public class PromiseAggregator<V, F extends Future<V>> implements GenericFutureListener<F> {
36
37 private final Promise<?> aggregatePromise;
38 private final boolean failPending;
39 private Set<Promise<V>> pendingPromises;
40
41 /**
42 * Creates a new instance.
43 *
44 * @param aggregatePromise the {@link Promise} to notify
45 * @param failPending {@code true} to fail pending promises, false to leave them unaffected
46 */
47 public PromiseAggregator(Promise<Void> aggregatePromise, boolean failPending) {
48 this.aggregatePromise = ObjectUtil.checkNotNull(aggregatePromise, "aggregatePromise");
49 this.failPending = failPending;
50 }
51
52 /**
53 * See {@link PromiseAggregator#PromiseAggregator(Promise, boolean)}.
54 * Defaults {@code failPending} to true.
55 */
56 public PromiseAggregator(Promise<Void> aggregatePromise) {
57 this(aggregatePromise, true);
58 }
59
60 /**
61 * Add the given {@link Promise}s to the aggregator.
62 */
63 @SafeVarargs
64 public final PromiseAggregator<V, F> add(Promise<V>... promises) {
65 ObjectUtil.checkNotNull(promises, "promises");
66 if (promises.length == 0) {
67 return this;
68 }
69 synchronized (this) {
70 if (pendingPromises == null) {
71 int size;
72 if (promises.length > 1) {
73 size = promises.length;
74 } else {
75 size = 2;
76 }
77 pendingPromises = new LinkedHashSet<Promise<V>>(size);
78 }
79 for (Promise<V> p : promises) {
80 if (p == null) {
81 continue;
82 }
83 pendingPromises.add(p);
84 p.addListener(this);
85 }
86 }
87 return this;
88 }
89
90 @Override
91 public synchronized void operationComplete(F future) throws Exception {
92 if (pendingPromises == null) {
93 aggregatePromise.setSuccess(null);
94 } else {
95 pendingPromises.remove(future);
96 if (!future.isSuccess()) {
97 Throwable cause = future.cause();
98 aggregatePromise.setFailure(cause);
99 if (failPending) {
100 for (Promise<V> pendingFuture : pendingPromises) {
101 pendingFuture.setFailure(cause);
102 }
103 }
104 } else {
105 if (pendingPromises.isEmpty()) {
106 aggregatePromise.setSuccess(null);
107 }
108 }
109 }
110 }
111
112 }
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