1 /*
2  * Copyright 2017 Google LLC
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions are
6  * met:
7  *
8  *     * Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  *     * Redistributions in binary form must reproduce the above
11  * copyright notice, this list of conditions and the following disclaimer
12  * in the documentation and/or other materials provided with the
13  * distribution.
14  *     * Neither the name of Google LLC nor the names of its
15  * contributors may be used to endorse or promote products derived from
16  * this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 package com.google.api.gax.retrying;
31 
32 import com.google.api.core.AbstractApiFuture;
33 import com.google.api.core.InternalApi;
34 
35 /**
36  * A future which cannot be cancelled from the external package.
37  *
38  * <p>For internal use, public for technical reasons.
39  *
40  * @param <ResponseT> future response type
41  */
42 @InternalApi
43 public final class NonCancellableFuture<ResponseT> extends AbstractApiFuture<ResponseT> {
44   @Override
cancel(boolean mayInterruptIfRunning)45   public boolean cancel(boolean mayInterruptIfRunning) {
46     return false;
47   }
48 
cancelPrivately()49   void cancelPrivately() {
50     super.cancel(false);
51   }
52 
setPrivately(ResponseT value)53   boolean setPrivately(ResponseT value) {
54     return super.set(value);
55   }
56 
setExceptionPrivately(Throwable throwable)57   boolean setExceptionPrivately(Throwable throwable) {
58     return super.setException(throwable);
59   }
60 }
61