Bug 5740: Change TimeoutNow and Shutdown to externalizable proxy
[controller.git] / opendaylight / md-sal / sal-akka-raft / src / main / java / org / opendaylight / controller / cluster / raft / base / messages / TimeoutNow.java
1 /*
2  * Copyright (c) 2016 Brocade Communications Systems, Inc. and others.  All rights reserved.
3  *
4  * This program and the accompanying materials are made available under the
5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6  * and is available at http://www.eclipse.org/legal/epl-v10.html
7  */
8 package org.opendaylight.controller.cluster.raft.base.messages;
9
10 import java.io.Serializable;
11
12 /**
13  * Message sent to a follower to force an immediate election time out.
14  *
15  * @author Thomas Pantelis
16  */
17 public final class TimeoutNow implements Serializable {
18     private static final long serialVersionUID = 1L;
19     public static final TimeoutNow INSTANCE = new TimeoutNow();
20
21     private TimeoutNow() {
22         // Hidden on purpose
23     }
24
25     private Object writeReplace() {
26         return new Proxy();
27     }
28
29     private static class Proxy extends EmptyExternalizableProxy {
30         private static final long serialVersionUID = 1L;
31
32         // checkstyle flags the public modifier as redundant which really doesn't make sense since it clearly isn't
33         // redundant. It is explicitly needed for Java serialization to be able to create instances via reflection.
34         @SuppressWarnings("checkstyle:RedundantModifier")
35         public Proxy() {
36             super(INSTANCE);
37         }
38     }
39 }

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