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gurux.terminal.java package is used to communicate with terminal (modem) connection.
//
// --------------------------------------------------------------------------
// Gurux Ltd
//
//
//
// Filename: $HeadURL$
//
// Version: $Revision$,
// $Date$
// $Author$
//
// Copyright (c) Gurux Ltd
//
//---------------------------------------------------------------------------
//
// DESCRIPTION
//
// This file is a part of Gurux Device Framework.
//
// Gurux Device Framework is Open Source software; you can redistribute it
// and/or modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; version 2 of the License.
// Gurux Device Framework is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// More information of Gurux products: http://www.gurux.org
//
// This code is licensed under the GNU General Public License v2.
// Full text may be retrieved at http://www.gnu.org/licenses/gpl-2.0.txt
//---------------------------------------------------------------------------
package gurux.terminal;
import java.lang.reflect.Array;
import gurux.common.GXSynchronousMediaBase;
import gurux.common.ReceiveEventArgs;
import gurux.common.enums.TraceLevel;
import gurux.common.enums.TraceTypes;
import gurux.io.NativeCode;
/**
* Receive thread listens serial port and sends received data to the listeners.
*
* @author Gurux Ltd.
*/
class GXReceiveThread extends Thread {
/**
* If receiver buffer is empty how long is waited for new data.
*/
static final int WAIT_TIME = 200;
/**
* Serial port handle.
*/
private long comPort;
/**
* Parent component.
*/
private GXTerminal parentMedia;
/**
* Bytes received.
*/
private long bytesReceived = 0;
/**
* Constructor.
*
* @param parent
* Parent component.
* @param hComPort
* Handle for the serial port.
*/
GXReceiveThread(final GXTerminal parent, final long hComPort) {
super("GXTerminal " + String.valueOf(hComPort));
comPort = hComPort;
parentMedia = parent;
}
/**
* Get amount of received bytes.
*
* @return Amount of received bytes.
*/
public final long getBytesReceived() {
return bytesReceived;
}
/**
* Reset amount of received bytes.
*/
public final void resetBytesReceived() {
bytesReceived = 0;
}
/**
* Handle received data.
*
* @param buffer
* Received data from the serial port.
*/
private void handleReceivedData(final byte[] buffer) {
int len = buffer.length;
if (len == 0) {
try {
Thread.sleep(WAIT_TIME);
} catch (Exception ex) {
return;
}
return;
}
bytesReceived += len;
int totalCount = 0;
if (parentMedia.getIsSynchronous()) {
gurux.common.TraceEventArgs arg = null;
synchronized (parentMedia.getSyncBase().getSync()) {
parentMedia.getSyncBase().appendData(buffer, 0, len);
// Search end of packet if given.
if (parentMedia.getEop() != null) {
if (parentMedia.getEop() instanceof Array) {
for (Object eop : (Object[]) parentMedia.getEop()) {
totalCount = GXSynchronousMediaBase.indexOf(buffer,
GXSynchronousMediaBase.getAsByteArray(eop),
0, len);
if (totalCount != -1) {
break;
}
}
} else {
totalCount = GXSynchronousMediaBase.indexOf(buffer,
GXSynchronousMediaBase.getAsByteArray(
parentMedia.getEop()),
0, len);
}
}
if (totalCount != -1) {
if (parentMedia.getTrace() == TraceLevel.VERBOSE) {
arg = new gurux.common.TraceEventArgs(
TraceTypes.RECEIVED, buffer, 0, totalCount + 1);
}
parentMedia.getSyncBase().setReceived();
}
}
if (arg != null) {
parentMedia.notifyTrace(arg);
}
} else {
parentMedia.getSyncBase().resetReceivedSize();
byte[] data = new byte[len];
System.arraycopy(buffer, 0, data, 0, len);
if (parentMedia.getTrace() == TraceLevel.VERBOSE) {
parentMedia.notifyTrace(new gurux.common.TraceEventArgs(
TraceTypes.RECEIVED, data));
}
ReceiveEventArgs e =
new ReceiveEventArgs(data, parentMedia.getPortName());
parentMedia.notifyReceived(e);
}
}
@Override
public final void run() {
while (!Thread.currentThread().isInterrupted()) {
try {
byte[] buff = gurux.io.NativeCode.read(this.comPort,
parentMedia.getReadTimeout(), parentMedia.getClosing());
// If connection is closed.
if (buff.length == 0
&& Thread.currentThread().isInterrupted()) {
parentMedia.setClosing(0);
break;
}
Thread.sleep(parentMedia.getReceiveDelay());
byte[] buff2 = null;
try {
if (NativeCode.getBytesToRead(this.comPort) != 0) {
buff2 = NativeCode.read(this.comPort, 1,
parentMedia.getClosing());
}
} catch (Exception ex) {
// getBytesToRead fails with some chipsets.
// Just ignore it.
}
if (buff2 != null && buff2.length != 0) {
byte[] tmp = new byte[buff.length + buff2.length];
System.arraycopy(buff, 0, tmp, 0, buff.length);
System.arraycopy(buff2, 0, tmp, buff.length, buff2.length);
handleReceivedData(tmp);
} else {
handleReceivedData(buff);
}
} catch (Exception ex) {
if (!Thread.currentThread().isInterrupted()) {
parentMedia
.notifyError(new RuntimeException(ex.getMessage()));
} else {
break;
}
}
}
}
}