com.intelligt.modbus.jlibmodbus.slave.ModbusSlaveTCP Maven / Gradle / Ivy

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JAX-WS Reference Implementation Runtime
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package com.intelligt.modbus.jlibmodbus.slave;

import com.intelligt.modbus.jlibmodbus.Modbus;
import com.intelligt.modbus.jlibmodbus.exception.ModbusIOException;
import com.intelligt.modbus.jlibmodbus.net.ModbusConnection;
import com.intelligt.modbus.jlibmodbus.net.ModbusSlaveConnectionTCP;
import com.intelligt.modbus.jlibmodbus.tcp.TcpParameters;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

/*
 * Copyright (C) 2016 "Invertor" Factory", JSC
 * [http://www.sbp-invertor.ru]
 *
 * This file is part of JLibModbus.
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Authors: Vladislav Y. Kochedykov, software engineer.
 * email: [email protected]
 */
public class ModbusSlaveTCP extends ModbusSlave implements Runnable {

    final private static int DEFAULT_POOLS_SIZE = 10;
    final private ExecutorService threadPool;
    final private TcpParameters tcp;
    private Thread mainThread = null;
    private ServerSocket server = null;

    public ModbusSlaveTCP(TcpParameters tcp) {
        this(tcp, DEFAULT_POOLS_SIZE);
    }

    public ModbusSlaveTCP(TcpParameters tcp, int poolsSize) {
        this.tcp = new TcpParameters(tcp);
        threadPool = Executors.newFixedThreadPool(poolsSize);
    }

    @Override
    synchronized public void listenImpl() throws ModbusIOException {
        try {
            server = new ServerSocket(tcp.getPort());
            mainThread = new Thread(this);
            setListening(true);
            mainThread.start();
        } catch (IOException e) {
            throw new ModbusIOException(e);
        }
    }

    @Override
    synchronized public void shutdownImpl() {
        /*
        close server socket
         */
        try {
            if (server != null)
                server.close();
        } catch (IOException e) {
            Modbus.log().warning(e.getLocalizedMessage());
        } finally {
            server = null;
        }
        /*
        shutdown the thread pool
         */
        threadPool.shutdown();
        try {
            threadPool.awaitTermination(1, TimeUnit.SECONDS);
        } catch (InterruptedException e) {
            threadPool.shutdownNow();
        }

        try {
            if (mainThread != null) {
                mainThread.join(1000);
                if (mainThread.isAlive())
                    mainThread.interrupt();
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            mainThread = null;
        }
    }

    @Override
    void connectionOpened(ModbusConnection connection) {
        super.connectionOpened(connection);
        notifyObservers(((ModbusSlaveConnectionTCP) connection).getClientInfo());
    }

    @Override
    void connectionClosed(ModbusConnection connection) {
        super.connectionClosed(connection);
        notifyObservers(((ModbusSlaveConnectionTCP) connection).getClientInfo());
    }

    @Override
    public void run() {
        Socket s;
        try {
            while (isListening()) {
                s = server.accept();
                try {
                    threadPool.execute(new RequestHandlerTCP(this, s));
                } catch (ModbusIOException ioe) {
                    Modbus.log().warning(ioe.getLocalizedMessage());
                    s.close();
                }
            }
        } catch (SocketException e) {
            if (server != null && !server.isClosed()) {
                Modbus.log().warning(e.getLocalizedMessage());
                e.printStackTrace();
            }
        } catch (IOException e) {
            Modbus.log().warning(e.getLocalizedMessage());
            e.printStackTrace();
        } finally {
            if (isListening()) {
                try {
                    shutdown();
                } catch (ModbusIOException e) {
                    Modbus.log().warning(e.getLocalizedMessage());
                    e.printStackTrace();
                }
            }
        }
    }
}