| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package backtype.storm.messaging.netty; |
| |
| import java.io.IOException; |
| |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.jboss.netty.buffer.ChannelBufferOutputStream; |
| import org.jboss.netty.buffer.ChannelBuffers; |
| |
| enum ControlMessage { |
| CLOSE_MESSAGE((short)-100), |
| EOB_MESSAGE((short)-201), |
| OK_RESPONSE((short)-200), |
| FAILURE_RESPONSE((short)-400), |
| SASL_TOKEN_MESSAGE_REQUEST((short)-202), |
| SASL_COMPLETE_REQUEST((short)-203); |
| |
| private short code; |
| |
| //private constructor |
| private ControlMessage(short code) { |
| this.code = code; |
| } |
| |
| /** |
| * Return a control message per an encoded status code |
| * @param encoded |
| * @return |
| */ |
| static ControlMessage mkMessage(short encoded) { |
| for(ControlMessage cm: ControlMessage.values()) { |
| if(encoded == cm.code) return cm; |
| } |
| return null; |
| } |
| |
| int encodeLength() { |
| return 2; //short |
| } |
| |
| /** |
| * encode the current Control Message into a channel buffer |
| * @throws Exception |
| */ |
| ChannelBuffer buffer() throws IOException { |
| ChannelBufferOutputStream bout = new ChannelBufferOutputStream(ChannelBuffers.directBuffer(encodeLength())); |
| write(bout); |
| bout.close(); |
| return bout.buffer(); |
| } |
| |
| void write(ChannelBufferOutputStream bout) throws IOException { |
| bout.writeShort(code); |
| } |
| } |