public int getTransactionID() {
return c_TransactionID.get();
} // getTransactionID
public void execute() throws ModbusIOException, ModbusSlaveException, ModbusException {
// 1. assert executeability
assertExecutable();
try {
// 2. Lock transaction
/**
* Note: The way this explicit synchronization is implemented at the moment, there is no
* ordering of pending threads. The Mutex will simply call notify() and the JVM will handle
* the rest.
*/
m_TransactionLock.acquire();
// 3. write request, and read response,
// while holding the lock on the IO object
synchronized (m_IO) {
int tries = 0;
boolean finished = false;
// toggle the id
m_Request.setTransactionID(c_TransactionID.increment());
do {
try {
if (m_TransDelayMS > 0) {
try {
// Thread.sleep(m_TransDelayMS);
Thread.sleep(10);
} catch (InterruptedException ex) {
System.err.println("InterruptedException: " + ex.getMessage());
}
}
// write request message
m_IO.writeMessage(m_Request);
try {
// Thread.sleep(m_TransDelayMS);
Thread.sleep(20);
} catch (InterruptedException ex) {
System.err.println("InterruptedException: " + ex.getMessage());
}
// read response message
m_Response = m_IO.readResponse();
finished = true;
} catch (ModbusIOException e) {
if (++tries >= m_Retries) {
throw e;
}
System.err.println("execute try " + tries + " error: " + e.getMessage());
// throw e;
}
} while (!finished);
}
// 4. deal with exceptions
if (m_Response instanceof ExceptionResponse) {
throw new ModbusSlaveException(((ExceptionResponse) m_Response).getExceptionCode());
}
if (isCheckingValidity()) {
checkValidity();
}
} catch (InterruptedException ex) {
throw new ModbusIOException("Thread acquiring lock was interrupted.");
} finally {
m_TransactionLock.release();
}
} // execute