Package jmri.jmrix.dccpp

Class DCCppPacketizer

java.lang.Object

jmri.jmrix.AbstractMRTrafficController

jmri.jmrix.dccpp.DCCppTrafficController

jmri.jmrix.dccpp.DCCppPacketizer

All Implemented Interfaces:

DCCppInterface

Direct Known Subclasses:

DCCppOverTcpPacketizer, SerialDCCppPacketizer

public class DCCppPacketizer
extends DCCppTrafficController

Converts Stream-based I/O to/from DCC++ messages. The "DCCppInterface" side sends/receives DCCppMessage objects. The connection to a DCCppPortController is via a pair of *Streams, which then carry sequences of characters for transmission.

Messages come to this via the main GUI thread, and are forwarded back to listeners in that same thread. Reception and transmission are handled in dedicated threads by RcvHandler and XmtHandler objects. Those are internal classes defined here. The thread priorities are:

• RcvHandler - at highest available priority
• XmtHandler - down one, which is assumed to be above the GUI
• (everything else)

Nested Class Summary

Nested classes/interfaces inherited from class jmri.jmrix.AbstractMRTrafficController

AbstractMRTrafficController.RcvNotifier, AbstractMRTrafficController.XmtNotifier

Field Summary

Fields inherited from class jmri.jmrix.dccpp.DCCppTrafficController

anyReceived, highPriorityListeners, highPriorityQueue, mCommandStation, mListenerMasks, mMemo, startUpDelay

Fields inherited from class jmri.jmrix.AbstractMRTrafficController

allowUnexpectedReply, AUTORETRYSTATE, cmdListeners, connectionError, controller, flushReceiveChars, IDLESTATE, istream, listenerQueue, maxRcvExceptionCount, mCurrentMode, mCurrentState, mLastSender, msgQueue, mWaitBeforePoll, NORMALMODE, NOTIFIEDSTATE, OKSENDMSGSTATE, ostream, POLLSTATE, PROGRAMINGMODE, rcvException, rcvThread, replyInDispatch, threadStopRequest, timeoutFlag, timeouts, WAITMSGREPLYSTATE, WAITREPLYINNORMMODESTATE, WAITREPLYINPROGMODESTATE, waitTimePoll, xmtException, xmtRunnable, xmtThread

Fields inherited from interface jmri.jmrix.dccpp.DCCppInterface

ALL, COMMINFO, CONSIST, CS_INFO, FEEDBACK, INTERFACE, PROGRAMMING, THROTTLE

Constructor Summary

Constructors

Constructor	Description
DCCppPacketizer(DCCppCommandStation pCommandStation)

Method Summary

Modifier and Type	Method	Description
protected int	addHeaderToOutput(byte[] msg, AbstractMRMessage m)	Add header to the outgoing byte stream.
protected void	addTrailerToOutput(byte[] msg, int offset, AbstractMRMessage m)	Add trailer to the outgoing byte stream.
protected void	loadChars(AbstractMRReply msg, DataInputStream istream)	Get characters from the input source, and file a message.
boolean	portReadyToSend(AbstractPortController p)	Check to see if PortController object can be sent to. returns true if ready, false otherwise May throw an Exception.
void	sendDCCppMessage(DCCppMessage m, DCCppListener reply)	Forward a preformatted DCCppMessage to the actual interface.

Methods inherited from class jmri.jmrix.dccpp.DCCppTrafficController

addDCCppListener, endOfMessage, enterNormalMode, enterProgMode, forwardMessage, forwardReply, getCommandStation, getSystemConnectionMemo, getTurnoutReplyCache, handleTimeout, lengthOfByteStream, newReply, pollMessage, pollReplyHandler, programmerIdle, removeDCCppListener, sendHighPriorityDCCppMessage, setSystemConnectionMemo, transmitLoop

Methods inherited from class jmri.jmrix.AbstractMRTrafficController

addConsoleListener, addListener, canReceive, connectionWarn, connectPort, disconnectPort, distributeReply, enterProgModeDelayTime, forwardToPort, getLastSender, getPortName, getSynchronizeRx, handleOneIncomingReply, hasTimeouts, newRcvNotifier, notifyMessage, notifyReply, portWarn, portWarnTCP, readByteProtected, receiveLoop, recovery, removeListener, reportReceiveLoopException, resetTimeout, sendMessage, setAllowUnexpectedReply, setSynchronizeRx, status, terminate, terminateThreads, transmitWait, unexpectedReplyStateError, waitForStartOfReply, warnOnTimeout

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface jmri.jmrix.dccpp.DCCppInterface

status

Constructor Details

DCCppPacketizer

public DCCppPacketizer(DCCppCommandStation pCommandStation)

Method Details

sendDCCppMessage

public void sendDCCppMessage(DCCppMessage m,
 DCCppListener reply)

Forward a preformatted DCCppMessage to the actual interface. The message is converted to a byte array and queue for transmission

Specified by:

sendDCCppMessage in interface DCCppInterface

Specified by:

sendDCCppMessage in class DCCppTrafficController

Parameters:

m - Message to send

reply - Listener to notify when the reply to the message is received

addHeaderToOutput

protected int addHeaderToOutput(byte[] msg,
 AbstractMRMessage m)

Add header to the outgoing byte stream.

Overrides:

addHeaderToOutput in class AbstractMRTrafficController

Parameters:

msg - The output byte stream

m - ignored

Returns:

next location in the stream to fill

addTrailerToOutput

protected void addTrailerToOutput(byte[] msg,
 int offset,
 AbstractMRMessage m)

Add trailer to the outgoing byte stream. This version adds the checksum to the last byte.

Overrides:

addTrailerToOutput in class AbstractMRTrafficController

Parameters:

msg - The output byte stream

offset - the first byte not yet used

m - the message to check

portReadyToSend

public boolean portReadyToSend(AbstractPortController p)

Check to see if PortController object can be sent to. returns true if ready, false otherwise May throw an Exception.

Overrides:

portReadyToSend in class AbstractMRTrafficController

Parameters:

p - the PortController

Returns:

true if ready, false otherwise May throw an Exception.

loadChars

protected void loadChars(AbstractMRReply msg,
 DataInputStream istream)
                  throws IOException

Get characters from the input source, and file a message.

Returns only when the message is complete.

Only used in the Receive thread.

Overrides:

loadChars in class AbstractMRTrafficController

Parameters:

msg - message to fill

istream - character source.

Throws:

IOException - when presented by the input source.