--- /dev/null
+/*
+ * Copyright (c) 2022 PANTHEON.tech, s.r.o. 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.persisted;
+
+import static com.google.common.base.Verify.verifyNotNull;
+import static java.util.Objects.requireNonNull;
+
+import java.io.Externalizable;
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+import java.util.ArrayList;
+import org.opendaylight.controller.cluster.raft.ReplicatedLogEntry;
+import org.opendaylight.controller.cluster.raft.messages.Payload;
+import org.opendaylight.controller.cluster.raft.persisted.Snapshot.State;
+import org.opendaylight.yangtools.concepts.WritableObjects;
+
+/**
+ * Externalizable proxy for {@link Snapshot}.
+ */
+final class SS implements Externalizable {
+ @java.io.Serial
+ private static final long serialVersionUID = 1L;
+
+ private Snapshot snapshot;
+
+ @SuppressWarnings("checkstyle:RedundantModifier")
+ public SS() {
+ // For Externalizable
+ }
+
+ SS(final Snapshot snapshot) {
+ this.snapshot = requireNonNull(snapshot);
+ }
+
+ @Override
+ public void writeExternal(final ObjectOutput out) throws IOException {
+ WritableObjects.writeLongs(out, snapshot.getLastIndex(), snapshot.getLastTerm());
+ WritableObjects.writeLongs(out, snapshot.getLastAppliedIndex(), snapshot.getLastAppliedTerm());
+ WritableObjects.writeLong(out, snapshot.getElectionTerm());
+ out.writeObject(snapshot.getElectionVotedFor());
+ out.writeObject(snapshot.getServerConfiguration());
+
+ final var unAppliedEntries = snapshot.getUnAppliedEntries();
+ out.writeInt(unAppliedEntries.size());
+ for (var e : unAppliedEntries) {
+ WritableObjects.writeLongs(out, e.getIndex(), e.getTerm());
+ out.writeObject(e.getData());
+ }
+
+ out.writeObject(snapshot.getState());
+ }
+
+ @Override
+ public void readExternal(final ObjectInput in) throws IOException, ClassNotFoundException {
+ byte hdr = WritableObjects.readLongHeader(in);
+ long lastIndex = WritableObjects.readFirstLong(in, hdr);
+ long lastTerm = WritableObjects.readSecondLong(in, hdr);
+
+ hdr = WritableObjects.readLongHeader(in);
+ long lastAppliedIndex = WritableObjects.readFirstLong(in, hdr);
+ long lastAppliedTerm = WritableObjects.readSecondLong(in, hdr);
+ long electionTerm = WritableObjects.readLong(in);
+ String electionVotedFor = (String) in.readObject();
+ ServerConfigurationPayload serverConfig = (ServerConfigurationPayload) in.readObject();
+
+ int size = in.readInt();
+ var unAppliedEntries = new ArrayList<ReplicatedLogEntry>(size);
+ for (int i = 0; i < size; i++) {
+ hdr = WritableObjects.readLongHeader(in);
+ unAppliedEntries.add(new SimpleReplicatedLogEntry(
+ WritableObjects.readFirstLong(in, hdr), WritableObjects.readSecondLong(in, hdr),
+ (Payload) in.readObject()));
+ }
+
+ State state = (State) in.readObject();
+
+ snapshot = Snapshot.create(state, unAppliedEntries, lastIndex, lastTerm, lastAppliedIndex, lastAppliedTerm,
+ electionTerm, electionVotedFor, serverConfig);
+ }
+
+ @java.io.Serial
+ private Object readResolve() {
+ return verifyNotNull(snapshot);
+ }
+}