| /* |
| * 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 org.apache.dubbo.rpc.protocol.dubbo.pu; |
| |
| import org.apache.dubbo.remoting.api.ProtocolDetector; |
| import org.apache.dubbo.remoting.buffer.ByteBufferBackedChannelBuffer; |
| import org.apache.dubbo.remoting.buffer.ChannelBuffer; |
| import org.apache.dubbo.remoting.buffer.ChannelBuffers; |
| |
| import java.nio.ByteBuffer; |
| |
| import static java.lang.Math.min; |
| |
| public class DubboDetector implements ProtocolDetector { |
| private final ChannelBuffer Preface = new ByteBufferBackedChannelBuffer( |
| ByteBuffer.wrap(new byte[]{(byte)0xda, (byte)0xbb}) |
| ); |
| |
| @Override |
| public Result detect(ChannelBuffer in) { |
| int prefaceLen = Preface.readableBytes(); |
| int bytesRead = min(in.readableBytes(), prefaceLen); |
| |
| if (bytesRead ==0 || !ChannelBuffers.prefixEquals(in, Preface, bytesRead)) { |
| return Result.UNRECOGNIZED; |
| } |
| if (bytesRead == prefaceLen) { |
| return Result.RECOGNIZED; |
| } |
| |
| return Result.NEED_MORE_DATA; |
| } |
| } |