--- /dev/null
+/*
+ * Copyright (c) 2016 Cisco Systems, Inc. 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.access.concepts;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Preconditions;
+import java.io.Externalizable;
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+import org.opendaylight.yangtools.concepts.Identifier;
+
+/**
+ * Globally-unique identifier of a local history.
+ *
+ * @param <T> Frontend type
+ *
+ * @author Robert Varga
+ */
+public final class LocalHistoryIdentifier<T extends FrontendType> implements Identifier {
+ private static final class Proxy<T extends FrontendType> implements Externalizable {
+ private static final long serialVersionUID = 1L;
+ private ClientIdentifier<T> clientId;
+ private long historyId;
+
+ public Proxy() {
+ // For Externalizable
+ }
+
+ Proxy(final ClientIdentifier<T> frontendId, final long historyId) {
+ this.clientId = Preconditions.checkNotNull(frontendId);
+ this.historyId = historyId;
+ }
+
+ @Override
+ public void writeExternal(final ObjectOutput out) throws IOException {
+ out.writeObject(clientId);
+ out.writeLong(historyId);
+ }
+
+ @SuppressWarnings("unchecked")
+ @Override
+ public void readExternal(final ObjectInput in) throws IOException, ClassNotFoundException {
+ clientId = (ClientIdentifier<T>) in.readObject();
+ historyId = in.readLong();
+ }
+
+ private Object readResolve() {
+ return new LocalHistoryIdentifier<>(clientId, historyId);
+ }
+ }
+
+ private static final long serialVersionUID = 1L;
+ private final ClientIdentifier<T> clientId;
+ private final long historyId;
+
+ public LocalHistoryIdentifier(final ClientIdentifier<T> frontendId, final long historyId) {
+ this.clientId = Preconditions.checkNotNull(frontendId);
+ this.historyId = historyId;
+ }
+
+ public ClientIdentifier<T> getClienId() {
+ return clientId;
+ }
+
+ public long getHistoryId() {
+ return historyId;
+ }
+
+ @Override
+ public int hashCode() {
+ return clientId.hashCode() * 31 + Long.hashCode(historyId);
+ }
+
+ @Override
+ public boolean equals(final Object o) {
+ if (this == o) {
+ return true;
+ }
+ if (!(o instanceof LocalHistoryIdentifier)) {
+ return false;
+ }
+
+ final LocalHistoryIdentifier<?> other = (LocalHistoryIdentifier<?>) o;
+ return historyId == other.historyId && clientId.equals(other.clientId);
+ }
+
+ @Override
+ public String toString() {
+ return MoreObjects.toStringHelper(LocalHistoryIdentifier.class).add("client", clientId)
+ .add("history", Long.toUnsignedString(historyId)).toString();
+ }
+
+ private Object writeReplace() {
+ return new Proxy<>(clientId, historyId);
+ }
+}