+/*
+ * Copyright (c) 2017 Inocybe Technologies and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.cluster.raft.base.messages;
+
+import com.google.common.base.Preconditions;
+import java.io.Externalizable;
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+
+/**
+ * Abstract base that implements Externalizable with no-op methods that is intended for classes that use the
+ * externalizable proxy pattern but have no data to serialize and read-resolve to a static instance.
+ *
+ * @author Thomas Pantelis
+ */
+public abstract class EmptyExternalizableProxy implements Externalizable {
+ private static final long serialVersionUID = 1L;
+
+ private final Object readResolveTo;
+
+ protected EmptyExternalizableProxy(Object readResolveTo) {
+ this.readResolveTo = Preconditions.checkNotNull(readResolveTo);
+ }
+
+ @Override
+ public void writeExternal(ObjectOutput out) throws IOException {
+ }
+
+ @Override
+ public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
+ }
+
+ protected Object readResolve() {
+ return readResolveTo;
+ }
+}