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90 lines
3.5 KiB
90 lines
3.5 KiB
/*
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* Copyright (c) 2011 Oracle and/or its affiliates. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of Oracle nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This source code is provided to illustrate the usage of a given feature
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* or technique and has been deliberately simplified. Additional steps
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* required for a production-quality application, such as security checks,
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* input validation and proper error handling, might not be present in
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* this sample code.
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*/
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import java.nio.ByteBuffer;
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import java.nio.channels.CompletionHandler;
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/**
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* Handles a cycle of reading / writing on the {@code Client}.
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*/
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class ClientReader {
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private final DataReader callback;
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private final ChatServer chatServer;
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ClientReader(ChatServer chatServer, DataReader callback) {
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this.chatServer = chatServer;
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this.callback = callback;
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}
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public boolean acceptsMessages() {
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return callback.acceptsMessages();
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}
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/**
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* Runs a cycle of doing a beforeRead action and then enqueuing a new
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* read on the client. Handles closed channels and errors while reading.
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* If the client is still connected a new round of actions are called.
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*/
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public void run(final Client client) {
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callback.beforeRead(client);
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client.read(new CompletionHandler<Integer, ByteBuffer>() {
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@Override
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public void completed(Integer result, ByteBuffer buffer) {
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// if result is negative or zero the connection has been closed or something gone wrong
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if (result < 1) {
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client.close();
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System.out.println("Closing connection to " + client);
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chatServer.removeClient(client);
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} else {
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callback.onData(client, buffer, result);
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// enqueue next round of actions
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client.run();
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}
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}
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@Override
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public void failed(Throwable exc, ByteBuffer buffer) {
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client.close();
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chatServer.removeClient(client);
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}
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});
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}
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}
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