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  *  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
 *  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.tomcat.websocket;
import  java.nio.channels.CompletionHandler;
This is a wrapper for a java.nio.channels.AsynchronousSocketChannel that limits the methods available thereby simplifying the process of implementing SSL/TLS support since there are fewer methods to intercept.
public interface AsyncChannelWrapper {
    Future<Integerread(ByteBuffer dst);
    <B,A extends B> void read(ByteBuffer dst, A attachment,
            CompletionHandler<Integer,B> handler);
    Future<Integerwrite(ByteBuffer src);
    <B,A extends B> void write(ByteBuffer[] srcsint offsetint length,
            long timeoutTimeUnit unit, A attachment,
            CompletionHandler<Long,B> handler);
    void close();
    Future<Voidhandshake() throws SSLException;
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