package com.googlecode.jsonrpc4j.spring;

import com.googlecode.jsonrpc4j.StreamServer;
import org.springframework.beans.factory.DisposableBean;

import javax.net.ServerSocketFactory;
import java.net.InetAddress;
import java.net.ServerSocket;

import static com.googlecode.jsonrpc4j.Util.DEFAULT_HOSTNAME;


/**
 * {@link org.springframework.remoting.support.RemoteExporter RemoteExporter}
 * that exports services using Json according to the JSON-RPC proposal specified
 * at:
 * <a href="http://groups.google.com/group/json-rpc">
 * http://groups.google.com/group/json-rpc</a>.
 */
@SuppressWarnings("unused")
public class JsonStreamServiceExporter extends AbstractJsonServiceExporter implements DisposableBean {

    private static final int DEFAULT_MAX_THREADS = 50;
    private static final int DEFAULT_PORT = 10420;
    private static final int DEFAULT_BACKLOG = 0;
    private static final int DEFAULT_MAX_CLIENT_ERRORS = 5;

    private ServerSocketFactory serverSocketFactory;
    private int maxThreads = DEFAULT_MAX_THREADS;
    private int port = DEFAULT_PORT;
    private int backlog = DEFAULT_BACKLOG;
    private int maxClientErrors = DEFAULT_MAX_CLIENT_ERRORS;
    private String hostName = DEFAULT_HOSTNAME;

    private StreamServer streamServer;


    /**
     * {@inheritDoc}
     */
    @Override
    protected void exportService() throws Exception {

        if (streamServer == null) {
            if (serverSocketFactory == null) {
                serverSocketFactory = ServerSocketFactory.getDefault();
            }
            ServerSocket serverSocket =
                    serverSocketFactory.createServerSocket(port, backlog, InetAddress.getByName(hostName));
            streamServer = new StreamServer(getJsonRpcServer(), maxThreads, serverSocket);
            streamServer.setMaxClientErrors(maxClientErrors);
        }
        streamServer.start();
    }


    /**
     * {@inheritDoc}
     */
    public void destroy() throws Exception {
        streamServer.stop();
    }


    /**
     * @param serverSocketFactory the serverSocketFactory to set
     */
    public void setServerSocketFactory(ServerSocketFactory serverSocketFactory) {
        this.serverSocketFactory = serverSocketFactory;
    }


    /**
     * @param maxThreads the maxThreads to set
     */
    public void setMaxThreads(int maxThreads) {
        this.maxThreads = maxThreads;
    }


    /**
     * @param port the port to set
     */
    public void setPort(int port) {
        this.port = port;
    }


    /**
     * @param backlog the backlog to set
     */
    public void setBacklog(int backlog) {
        this.backlog = backlog;
    }


    /**
     * @param hostName the hostName to set
     */
    public void setHostName(String hostName) {
        this.hostName = hostName;
    }


    /**
     * @param streamServer the streamServer to set
     */
    public void setStreamServer(StreamServer streamServer) {
        this.streamServer = streamServer;
    }


    /**
     * @param maxClientErrors the maxClientErrors to set
     */
    public void setMaxClientErrors(int maxClientErrors) {
        this.maxClientErrors = maxClientErrors;
    }

}
