Pavlin Radoslavov | 80f3e18 | 2014-12-15 10:46:18 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onosproject.sdnip.bgp; |
| 17 | |
| 18 | import org.jboss.netty.buffer.ChannelBuffer; |
| 19 | import org.jboss.netty.buffer.ChannelBuffers; |
| 20 | import org.slf4j.Logger; |
| 21 | import org.slf4j.LoggerFactory; |
| 22 | |
| 23 | /** |
| 24 | * A class for preparing BGP messages. |
| 25 | */ |
| 26 | final class BgpMessage { |
| 27 | private static final Logger log = |
| 28 | LoggerFactory.getLogger(BgpMessage.class); |
| 29 | |
| 30 | /** |
| 31 | * Default constructor. |
| 32 | * <p> |
| 33 | * The constructor is private to prevent creating an instance of |
| 34 | * this utility class. |
| 35 | */ |
| 36 | private BgpMessage() { |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * Prepares BGP message. |
| 41 | * |
| 42 | * @param type the BGP message type |
| 43 | * @param payload the message payload to transmit (BGP header excluded) |
| 44 | * @return the message to transmit (BGP header included) |
| 45 | */ |
| 46 | static ChannelBuffer prepareBgpMessage(int type, ChannelBuffer payload) { |
| 47 | ChannelBuffer message = |
| 48 | ChannelBuffers.buffer(BgpConstants.BGP_HEADER_LENGTH + |
| 49 | payload.readableBytes()); |
| 50 | |
| 51 | // Write the marker |
| 52 | for (int i = 0; i < BgpConstants.BGP_HEADER_MARKER_LENGTH; i++) { |
| 53 | message.writeByte(0xff); |
| 54 | } |
| 55 | |
| 56 | // Write the rest of the BGP header |
| 57 | message.writeShort(BgpConstants.BGP_HEADER_LENGTH + |
| 58 | payload.readableBytes()); |
| 59 | message.writeByte(type); |
| 60 | |
| 61 | // Write the payload |
| 62 | message.writeBytes(payload); |
| 63 | return message; |
| 64 | } |
| 65 | } |