Coverage Summary for Class: RemovalListeners (com.google.common.cache)

1 /*
2  * Copyright (C) 2011 The Guava Authors
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5  * in compliance with the License. You may obtain a copy of the License at
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software distributed under the License
10  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11  * or implied. See the License for the specific language governing permissions and limitations under
12  * the License.
13  */
14 
15 package com.google.common.cache;
16 
17 import static com.google.common.base.Preconditions.checkNotNull;
18 
19 import com.google.common.annotations.GwtIncompatible;
20 import java.util.concurrent.Executor;
21 
22 /**
23  * A collection of common removal listeners.
24  *
25  * @author Charles Fry
26  * @since 10.0
27  */
28 @GwtIncompatible
29 public final class RemovalListeners {
30 
31   private RemovalListeners() {}
32 
33   /**
34    * Returns a {@code RemovalListener} which processes all eviction notifications using {@code
35    * executor}.
36    *
37    * @param listener the backing listener
38    * @param executor the executor with which removal notifications are asynchronously executed
39    */
40   public static <K, V> RemovalListener<K, V> asynchronous(
41       final RemovalListener<K, V> listener, final Executor executor) {
42     checkNotNull(listener);
43     checkNotNull(executor);
44     return new RemovalListener<K, V>() {
45       @Override
46       public void onRemoval(final RemovalNotification<K, V> notification) {
47         executor.execute(
48             new Runnable() {
49               @Override
50               public void run() {
51                 listener.onRemoval(notification);
52               }
53             });
54       }
55     };
56   }
57 }