/*
 ***************************************************************************************
 *  Copyright (C) 2006 EsperTech, Inc. All rights reserved.                            *
 *  http://www.espertech.com/esper                                                     *
 *  http://www.espertech.com                                                           *
 *  ---------------------------------------------------------------------------------- *
 *  The software in this package is published under the terms of the GPL license       *
 *  a copy of which has been included with this distribution in the license.txt file.  *
 ***************************************************************************************
 */
package com.espertech.esperio.socket.core;

import com.espertech.esper.core.service.EPServiceProviderSPI;
import com.espertech.esperio.socket.config.SocketConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;

public class EsperSocketService {

    private static Logger log = LoggerFactory.getLogger(EsperSocketService.class);

    private final String serviceName;
    private final SocketConfig serviceConfig;
    private ServerSocket serverSocket;
    private EsperSocketServiceRunnable runnable;
    private Thread socketThread;

    public EsperSocketService(String serviceName, SocketConfig serviceConfig) {
        this.serviceName = serviceName;
        this.serviceConfig = serviceConfig;
    }

    public String getServiceName() {
        return serviceName;
    }

    public void start(String serviceName, EPServiceProviderSPI engineSPI) throws IOException {

        if (serviceConfig.getHostname() != null) {
            InetAddress inetAddress = InetAddress.getByName(serviceConfig.getHostname());
            int backlog = serviceConfig.getBacklog() == null ? 2 : serviceConfig.getBacklog();
            log.info("Esper socket adapter accepting connections on port " + serviceConfig.getPort() + " and host '" + serviceConfig.getHostname() + "' backlog " + backlog + " for socket named '" + serviceName + "'");
            serverSocket = new ServerSocket(serviceConfig.getPort(), backlog, inetAddress);
        } else {
            if (serviceConfig.getBacklog() != null) {
                log.info("Esper socket adapter accepting connections on port " + serviceConfig.getPort() + " backlog " + serviceConfig.getBacklog() + " for socket named '" + serviceName + "'");
                serverSocket = new ServerSocket(serviceConfig.getPort(), serviceConfig.getBacklog());
            } else {
                log.info("Esper socket adapter accepting connections on port " + serviceConfig.getPort() + " for socket named '" + serviceName + "'");
                serverSocket = new ServerSocket(serviceConfig.getPort());
            }
        }

        runnable = new EsperSocketServiceRunnable(this.getServiceName(), this.serviceConfig, serverSocket, engineSPI);
        socketThread = new Thread(runnable);
        socketThread.setDaemon(true);
        socketThread.start();
    }

    public void destroy() {
        log.info("Closing existing workers for service '" + this.getServiceName() + "'");
        runnable.destroy();

        log.info("Closing server socket for service '" + this.getServiceName() + "' and port " + serviceConfig.getPort());
        try {
            serverSocket.close();
        } catch (IOException e) {
            log.debug("Error closing server socket: " + e.getMessage(), e);
        }

        log.info("Stopping socket thread for service '" + this.getServiceName() + "'");
        socketThread.interrupt();
        try {
            socketThread.join(10000);
        } catch (InterruptedException e) {
            log.debug("Interrupted", e);
        }
    }

    public int getPort() {
        return serviceConfig.getPort();
    }
}