dubbo Http2ProtocolDetector 源码
dubbo Http2ProtocolDetector 代码
文件路径：/dubbo-rpc/dubbo-rpc-triple/src/main/java/org/apache/dubbo/rpc/protocol/tri/Http2ProtocolDetector.java
/*
* 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.tri;
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 io.netty.handler.codec.http2.Http2CodecUtil;
import static java.lang.Math.min;
public class Http2ProtocolDetector implements ProtocolDetector {
private final ChannelBuffer clientPrefaceString = new ByteBufferBackedChannelBuffer(
Http2CodecUtil.connectionPrefaceBuf().nioBuffer());
@Override
public Result detect(ChannelBuffer in) {
int prefaceLen = clientPrefaceString.readableBytes();
int bytesRead = min(in.readableBytes(), prefaceLen);
// If the input so far doesn't match the preface, break the connection.
if (bytesRead == 0 || !ChannelBuffers.prefixEquals(in, clientPrefaceString, bytesRead)) {
return Result.UNRECOGNIZED;
}
if (bytesRead == prefaceLen) {
return Result.RECOGNIZED;
}
return Result.NEED_MORE_DATA;
}
}
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