2 * Copyright (c) 2013 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.protocol.bgp.parser.spi;
10 import io.netty.buffer.ByteBuf;
12 import java.util.Arrays;
14 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
15 import org.opendaylight.protocol.bgp.parser.BGPError;
16 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
17 import org.opendaylight.protocol.util.ByteArray;
18 import org.opendaylight.yangtools.yang.binding.Notification;
20 import com.google.common.base.Preconditions;
21 import com.google.common.primitives.UnsignedBytes;
23 public abstract class AbstractMessageRegistry implements MessageRegistry {
25 private static final byte[] MARKER;
27 protected abstract Notification parseBody(final int type, final ByteBuf body, final int messageLength) throws BGPDocumentedException;
29 protected abstract byte[] serializeMessageImpl(final Notification message);
32 MARKER = new byte[MessageUtil.MARKER_LENGTH];
33 Arrays.fill(MARKER, UnsignedBytes.MAX_VALUE);
37 public final Notification parseMessage(final ByteBuf buffer) throws BGPDocumentedException, BGPParsingException {
38 Preconditions.checkArgument(buffer != null && buffer.readableBytes() != 0, "Array of bytes cannot be null or empty.");
39 Preconditions.checkArgument(buffer.readableBytes() >= MessageUtil.COMMON_HEADER_LENGTH, "Too few bytes in passed array. Passed: %s. Expected: >= %s.", buffer.readableBytes(), MessageUtil.COMMON_HEADER_LENGTH);
40 final byte[] marker = ByteArray.readBytes(buffer, MessageUtil.MARKER_LENGTH);
42 if (!Arrays.equals(marker, MARKER)) {
43 throw new BGPDocumentedException("Marker not set to ones.", BGPError.CONNECTION_NOT_SYNC);
45 final int messageLength = buffer.readUnsignedShort();
46 // to be sent with Error message
47 final byte typeBytes = buffer.readByte();
48 final int messageType = UnsignedBytes.toInt(typeBytes);
50 final ByteBuf msgBody = buffer.slice(buffer.readerIndex(), messageLength - MessageUtil.COMMON_HEADER_LENGTH);
52 if (messageLength < MessageUtil.COMMON_HEADER_LENGTH) {
53 throw BGPDocumentedException.badMessageLength("Message length field not within valid range.", messageLength);
55 if (msgBody.readableBytes() != messageLength - MessageUtil.COMMON_HEADER_LENGTH) {
56 throw new BGPParsingException("Size doesn't match size specified in header. Passed: " + msgBody.readableBytes() + "; Expected: "
57 + (messageLength - MessageUtil.COMMON_HEADER_LENGTH) + ". ");
59 final Notification msg = parseBody(messageType, msgBody, messageLength);
61 throw new BGPDocumentedException("Unhandled message type " + messageType, BGPError.BAD_MSG_TYPE, new byte[] { typeBytes });
63 buffer.skipBytes(messageLength - MessageUtil.COMMON_HEADER_LENGTH);
68 public final byte[] serializeMessage(final Notification message) {
69 if (message == null) {
70 throw new IllegalArgumentException("BGPMessage is mandatory.");
72 final byte[] ret = serializeMessageImpl(message);
74 throw new IllegalArgumentException("Unknown instance of BGPMessage. Passed " + message.getClass());