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.access.commands;
10 import com.google.common.annotations.Beta;
11 import com.google.common.base.Preconditions;
12 import java.io.IOException;
13 import org.opendaylight.controller.cluster.datastore.node.utils.stream.NormalizedNodeDataInput;
14 import org.opendaylight.controller.cluster.datastore.node.utils.stream.NormalizedNodeDataOutput;
15 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
18 * An individual modification of a transaction's state. This class and its subclasses are not serializable, but rather
19 * expose {@link #writeTo(NormalizedNodeDataOutput)} and {@link #readFrom(NormalizedNodeDataInput)} methods for explicit
20 * serialization. The reason for this is that they are usually transmitted in bulk, hence it is advantageous to reuse
21 * a {@link NormalizedNodeDataOutput} instance to achieve better compression.
23 * @author Robert Varga
26 public abstract class TransactionModification {
27 static final byte TYPE_DELETE = 1;
28 static final byte TYPE_MERGE = 2;
29 static final byte TYPE_WRITE = 3;
31 private final YangInstanceIdentifier path;
33 TransactionModification(final YangInstanceIdentifier path) {
34 this.path = Preconditions.checkNotNull(path);
37 public final YangInstanceIdentifier getPath() {
41 abstract byte getType();
43 void writeTo(final NormalizedNodeDataOutput out) throws IOException {
44 out.writeByte(getType());
45 out.writeYangInstanceIdentifier(path);
48 static TransactionModification readFrom(final NormalizedNodeDataInput in) throws IOException {
49 final byte type = in.readByte();
52 return new TransactionDelete(in.readYangInstanceIdentifier());
54 return new TransactionMerge(in.readYangInstanceIdentifier(), in.readNormalizedNode());
56 return new TransactionWrite(in.readYangInstanceIdentifier(), in.readNormalizedNode());
58 throw new IllegalArgumentException("Unhandled type " + type);