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