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/**
 * SCA4J
 * Copyright (c) 2009 - 2099 Service Symphony Ltd
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 * Licensed to you under the Apache License, Version 2.0 (the "License"); you may
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 * This project contains code licensed from the Apache Software Foundation under
 * the Apache License, Version 2.0 and original code from project contributors.
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 * Copyright (c) 2007 - 2008 fabric3 project contributors
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package org.sca4j.binding.tcp.runtime.wire;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.URI;
import java.net.UnknownHostException;
import java.util.concurrent.ExecutorService;

import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.executor.ExecutorFilter;
import org.apache.mina.transport.socket.SocketAcceptor;
import org.apache.mina.transport.socket.nio.NioSocketAcceptor;
import org.oasisopen.sca.annotation.Destroy;
import org.oasisopen.sca.annotation.Reference;
import org.sca4j.api.annotation.Monitor;
import org.sca4j.binding.tcp.provision.TCPWireSourceDefinition;
import org.sca4j.binding.tcp.runtime.concurrent.SCA4JExecutorService;
import org.sca4j.binding.tcp.runtime.handler.TCPHandler;
import org.sca4j.binding.tcp.runtime.monitor.TCPBindingMonitor;
import org.sca4j.host.work.WorkScheduler;
import org.sca4j.spi.ObjectFactory;
import org.sca4j.spi.builder.WiringException;
import org.sca4j.spi.builder.component.SourceWireAttacher;
import org.sca4j.spi.model.physical.PhysicalWireTargetDefinition;
import org.sca4j.spi.wire.Wire;

/**
 * @version $Revision$ $Date$
 */
public class TCPSourceWireAttacher implements SourceWireAttacher {

    private final WorkScheduler workScheduler;

    private final TCPBindingMonitor monitor;

    private SocketAcceptor acceptor;

    /**
     * Inject dependencies
     * 
     * @param workScheduler
     *            F3 Work Scheduler
     */
    public TCPSourceWireAttacher(@Reference WorkScheduler workScheduler, 
                                 @Monitor TCPBindingMonitor monitor) {
        this.workScheduler = workScheduler;
        this.monitor = monitor;
    }

    /**
     * {@inheritDoc}
     */
    public void attachToSource(TCPWireSourceDefinition source, PhysicalWireTargetDefinition target, final Wire wire) throws WiringException {
        URI uri = source.getUri();
        String hostname = uri.getHost();
        int port = uri.getPort();

        ExecutorService filterExecutor = new SCA4JExecutorService(workScheduler);
        InetSocketAddress socketAddress;
        try {
            // TODO: Move below to separate component configurable with Codec
            // and IoHandler based on protocol like TCP/HTTP etc.
            socketAddress = new InetSocketAddress(hostname, port);
            acceptor = new NioSocketAcceptor();
            acceptor.getFilterChain().addLast("threadPool", new ExecutorFilter(filterExecutor));
            acceptor.getFilterChain().addLast("codec", new ProtocolCodecFilter(new CodecFactory()));

            acceptor.setHandler(new TCPHandler(wire, monitor));
            acceptor.bind(socketAddress);

            monitor.onTcpExtensionStarted(uri.toString());

        } catch (UnknownHostException exception) {
            throw new WiringException("Unable to bind to:" + uri.toString(), "binding.tcp", exception);
        } catch (IOException exception) {
            throw new WiringException("Unable to bind to:" + uri.toString(), "binding.tcp", exception);
        }

    }

    /**
     * {@inheritDoc}
     */
    public void detachFromSource(TCPWireSourceDefinition source, PhysicalWireTargetDefinition target, Wire wire) throws WiringException {
        throw new UnsupportedOperationException();
    }

    /**
     * {@inheritDoc}
     */
    public void attachObjectFactory(TCPWireSourceDefinition source, ObjectFactory objectFactory, PhysicalWireTargetDefinition definition) throws WiringException {
        throw new UnsupportedOperationException();
    }

    /**
     * Stops the processing.
     */
    @Destroy
    public void destroy() {
        acceptor.unbind();
        acceptor.dispose();
    }
}




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