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1   /*
2    * Copyright 2016 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  package io.netty.util.concurrent;
17  
18  import io.netty.util.internal.ObjectUtil;
19  import io.netty.util.internal.logging.InternalLogger;
20  import io.netty.util.internal.logging.InternalLoggerFactory;
21  
22  /**
23   *
24   * @deprecated use {@link PromiseNotifier#cascade(boolean, Future, Promise)}.
25   */
26  @Deprecated
27  public final class UnaryPromiseNotifier<T> implements FutureListener<T> {
28      private static final InternalLogger logger = InternalLoggerFactory.getInstance(UnaryPromiseNotifier.class);
29      private final Promise<? super T> promise;
30  
31      public UnaryPromiseNotifier(Promise<? super T> promise) {
32          this.promise = ObjectUtil.checkNotNull(promise, "promise");
33      }
34  
35      @Override
36      public void operationComplete(Future<T> future) throws Exception {
37          cascadeTo(future, promise);
38      }
39  
40      public static <X> void cascadeTo(Future<X> completedFuture, Promise<? super X> promise) {
41          if (completedFuture.isSuccess()) {
42              if (!promise.trySuccess(completedFuture.getNow())) {
43                  logger.warn("Failed to mark a promise as success because it is done already: {}", promise);
44              }
45          } else if (completedFuture.isCancelled()) {
46              if (!promise.cancel(false)) {
47                  logger.warn("Failed to cancel a promise because it is done already: {}", promise);
48              }
49          } else {
50              if (!promise.tryFailure(completedFuture.cause())) {
51                  logger.warn("Failed to mark a promise as failure because it's done already: {}", promise,
52                              completedFuture.cause());
53              }
54          }
55      }
56  }