2 * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.controller.cluster.datastore.persisted;
10 import static com.google.common.base.Verify.verifyNotNull;
11 import static java.util.Objects.requireNonNull;
13 import com.google.common.base.MoreObjects;
14 import com.google.common.io.ByteStreams;
15 import java.io.DataInput;
16 import java.io.Externalizable;
17 import java.io.IOException;
18 import java.io.ObjectInput;
19 import java.io.ObjectOutput;
20 import java.io.Serializable;
21 import java.util.function.Function;
22 import org.apache.commons.lang3.SerializationUtils;
23 import org.eclipse.jdt.annotation.NonNull;
24 import org.opendaylight.controller.cluster.raft.messages.IdentifiablePayload;
25 import org.opendaylight.yangtools.concepts.Identifiable;
26 import org.opendaylight.yangtools.concepts.Identifier;
29 * Abstract base class for {@link IdentifiablePayload}s which hold a single {@link Identifier}.
31 * @author Robert Varga
33 public abstract class AbstractIdentifiablePayload<T extends Identifier> extends IdentifiablePayload<T>
34 implements Serializable {
35 protected abstract static class AbstractProxy<T extends Identifier> implements Externalizable {
36 private static final long serialVersionUID = 1L;
38 private byte[] serialized;
41 public AbstractProxy() {
45 protected AbstractProxy(final byte[] serialized) {
46 this.serialized = requireNonNull(serialized);
50 public final void writeExternal(final ObjectOutput out) throws IOException {
51 out.writeInt(serialized.length);
52 out.write(serialized);
56 public final void readExternal(final ObjectInput in) throws IOException {
57 final int length = in.readInt();
58 serialized = new byte[length];
59 in.readFully(serialized);
60 identifier = verifyNotNull(readIdentifier(ByteStreams.newDataInput(serialized)));
63 protected final Object readResolve() {
64 return verifyNotNull(createObject(identifier, serialized));
67 protected abstract @NonNull T readIdentifier(@NonNull DataInput in) throws IOException;
69 @SuppressWarnings("checkstyle:hiddenField")
70 protected abstract @NonNull Identifiable<T> createObject(@NonNull T identifier, byte @NonNull[] serialized);
73 private static final long serialVersionUID = 1L;
75 private final byte @NonNull [] serialized;
76 private final @NonNull T identifier;
78 AbstractIdentifiablePayload(final @NonNull T identifier, final byte @NonNull[] serialized) {
79 this.identifier = requireNonNull(identifier);
80 this.serialized = requireNonNull(serialized);
84 public final T getIdentifier() {
89 public final int size() {
90 return serialized.length;
94 public final int serializedSize() {
95 // TODO: this is not entirely accurate, as the serialization stream has additional overheads:
96 // - 3 bytes for each block of data <256 bytes
97 // - 5 bytes for each block of data >=256 bytes
98 // - each block of data is limited to 1024 bytes as per serialization spec
99 return size() + externalizableProxySize();
103 public final String toString() {
104 return MoreObjects.toStringHelper(this).add("identifier", identifier).add("size", size()).toString();
108 protected final Object writeReplace() {
109 return verifyNotNull(externalizableProxy(serialized));
112 @SuppressWarnings("checkstyle:hiddenField")
113 protected abstract @NonNull AbstractProxy<T> externalizableProxy(byte @NonNull[] serialized);
115 protected abstract int externalizableProxySize();
117 protected static final int externalizableProxySize(final Function<byte[], ? extends AbstractProxy<?>> constructor) {
118 return SerializationUtils.serialize(constructor.apply(new byte[0])).length;