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/**
The contents of this file are subject to the Mozilla Public License Version 1.1 
(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.mozilla.org/MPL/ 
Software distributed under the License is distributed on an "AS IS" basis, 
WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the 
specific language governing rights and limitations under the License. 

The Original Code is "AcceptorThread.java".  Description: 
"A TCP/IP-based HL7 Service that uses separate ports for inbound and outbound messages." 

The Initial Developer of the Original Code is University Health Network. Copyright (C) 
2001.  All Rights Reserved. 

Contributor(s): ______________________________________. 

Alternatively, the contents of this file may be used under the terms of the 
GNU General Public License (the "GPL"), in which case the provisions of the GPL are 
applicable instead of those above.  If you wish to allow use of your version of this 
file only under the terms of the GPL and not to allow others to use your version 
of this file under the MPL, indicate your decision by deleting  the provisions above 
and replace  them with the notice and other provisions required by the GPL License.  
If you do not delete the provisions above, a recipient may use your version of 
this file under either the MPL or the GPL. 
 */
package ca.uhn.hl7v2.app;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import ca.uhn.hl7v2.concurrent.Service;
import ca.uhn.hl7v2.util.SocketFactory;
import ca.uhn.hl7v2.util.StandardSocketFactory;

/**
 * A Runnable that accepts connections on a ServerSocket and adds them to a
 * {@link BlockingQueue}, so that they can be handled asynchronously. After
 * stop() is called, the ServerSocket is closed.
 */
class AcceptorThread extends Service {

	/**
	 * @deprecated See {@link StandardSocketFactory#DEFAULT_ACCEPTED_SOCKET_TIMEOUT}
	 */
	@Deprecated
	static final int TIMEOUT = 500;
	
	private static final Logger log = LoggerFactory
			.getLogger(AcceptorThread.class);
	private int port;
	private boolean tls = false;
	private ServerSocket ss;
	private final BlockingQueue queue;
	private final SocketFactory socketFactory;

	public AcceptorThread(ServerSocket serverSocket, int port, ExecutorService service,
			BlockingQueue queue) throws IOException,
			SocketException {
		this(port, false, service, queue);
		this.ss = serverSocket;
	}

	public AcceptorThread(int port, ExecutorService service,
			BlockingQueue queue) throws IOException,
			SocketException {
		this(port, false, service, queue);
	}

	public AcceptorThread(int port, boolean tls, ExecutorService service,
			BlockingQueue queue) throws IOException,
			SocketException {
		this(port, tls, service, queue, null);
	}

	public AcceptorThread(int port, boolean tls, ExecutorService service, BlockingQueue queue, SocketFactory socketFactory) {
		super("Socket Acceptor", service);
		this.port = port;
		this.queue = queue;
		this.tls = tls;
		if (socketFactory == null) {
			socketFactory = new StandardSocketFactory();
		}
		this.socketFactory = socketFactory;
	}

	@Override
	protected void afterStartup() {
		try {
			if (this.tls) {
				ss = socketFactory.createTlsServerSocket();
			} else {
				ss = socketFactory.createServerSocket();
			}
			ss.bind(new InetSocketAddress(port));
			ss.setSoTimeout(500);
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

	@Override
	protected void handle() {
		try {
			Socket s = ss.accept();
			socketFactory.configureNewAcceptedSocket(s);
			if (!queue.offer(new AcceptedSocket(s))) {
				log.error("Denied enqueuing server-side socket {}", s);
				s.close();
			} else
				log.debug("Enqueued server-side socket {}", s);
		} catch (SocketTimeoutException e) { /* OK - just timed out */
			log.trace("No connection established while waiting");
		} catch (IOException e) {
			log.error("Error while accepting connections", e);
		}
	}

	@Override
	protected void afterTermination() {
		try {
			if (ss != null && !ss.isClosed())
				ss.close();
		} catch (IOException e) {
			log.warn("Error during stopping the thread", e);
		}
	}

	class AcceptedSocket {
		Socket socket;
		AcceptorThread origin;

		public AcceptedSocket(Socket socket) {
			if (socket == null)
				throw new IllegalArgumentException("Socket must not be null");
			this.socket = socket;
			this.origin = AcceptorThread.this;
		}

	}

}