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 / EmptyExternalizableProxy.java
1 /*
2  * Copyright (c) 2017 Inocybe Technologies 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 com.google.common.base.Preconditions;
11 import java.io.Externalizable;
12 import java.io.IOException;
13 import java.io.ObjectInput;
14 import java.io.ObjectOutput;
15
16 /**
17  * Abstract base that implements Externalizable with no-op methods that is intended for classes that use the
18  * externalizable proxy pattern but have no data to serialize and read-resolve to a static instance.
19  *
20  * @author Thomas Pantelis
21  */
22 public abstract class EmptyExternalizableProxy implements Externalizable {
23     private static final long serialVersionUID = 1L;
24
25     private final Object readResolveTo;
26
27     protected EmptyExternalizableProxy(Object readResolveTo) {
28         this.readResolveTo = Preconditions.checkNotNull(readResolveTo);
29     }
30
31     @Override
32     public void writeExternal(ObjectOutput out) throws IOException {
33     }
34
35     @Override
36     public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
37     }
38
39     protected Object readResolve() {
40         return readResolveTo;
41     }
42 }

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