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Implementation of the Modbus protocol in Java language
package com.invertor.modbus.slave;
import com.invertor.modbus.Modbus;
import com.invertor.modbus.ModbusSlave;
import com.invertor.modbus.data.CommStatus;
import com.invertor.modbus.data.DataHolder;
import com.invertor.modbus.data.comm.ModbusCommEventSend;
import com.invertor.modbus.exception.ModbusChecksumException;
import com.invertor.modbus.exception.ModbusIOException;
import com.invertor.modbus.msg.base.ModbusRequest;
import com.invertor.modbus.msg.base.ModbusResponse;
import com.invertor.modbus.msg.request.GetCommEventCounterRequest;
import com.invertor.modbus.msg.request.GetCommEventLogRequest;
import com.invertor.modbus.net.ModbusConnection;
import com.invertor.modbus.net.transport.ModbusTransport;
/*
* 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]
*/
class RequestHandlerSerial extends RequestHandler {
RequestHandlerSerial(ModbusSlave slave, ModbusConnection conn) {
super(slave, conn);
}
@Override
public void run() {
setListening(true);
do {
DataHolder dataHolder = getSlave().getDataHolder();
CommStatus commStatus = dataHolder.getCommStatus();
ModbusTransport transport = getConn().getTransport();
try {
ModbusRequest request = (ModbusRequest) transport.readRequest();
commStatus.incBusMessageCounter();
if (!(request instanceof GetCommEventCounterRequest ||
request instanceof GetCommEventLogRequest)) {
commStatus.enter();
}
if (request.getServerAddress() == getSlave().getServerAddress()) {
try {
ModbusResponse response = request.process(dataHolder);
commStatus.incSlaveMessageCounter();
if (response.isException()) {
commStatus.addEvent(ModbusCommEventSend.createExceptionSentRead());
commStatus.incExErrorCounter();
} else {
if (!(request instanceof GetCommEventCounterRequest ||
request instanceof GetCommEventLogRequest)) {
commStatus.incEventCounter();
}
}
if (!commStatus.isListenOnlyMode())
transport.send(response);
if (commStatus.isRestartCommunicationsOption()) {
commStatus.restartCommunicationsOption();
getSlave().listen();
}
} catch (RuntimeException re) {
throw re;
} catch (Exception e) {
/*
* quantity of messages addressed to the remote device for
* which it has returned no response (neither a normal response nor an exception response)
*/
commStatus.incNoResponseCounter();
throw e;
}
} else if (/*broadcast*/ request.getServerAddress() == Modbus.BROADCAST_ID && getSlave().isBroadcastEnabled()) {
//we do not answer these requests to avoid collisions on the bus
request.process(dataHolder);
}
} catch (ModbusChecksumException e) {
commStatus.incCommErrorCounter();
} catch (Exception e) {
Modbus.log().warning(e.getLocalizedMessage());
} finally {
commStatus.leave();
}
} while (isListening());
try {
getConn().close();
} catch (ModbusIOException e) {
Modbus.log().warning(e.getMessage());
}
}
}