Package jmri.jmrix.dccpp.dccppovertcp

Class DCCppOverTcpPacketizer

java.lang.Object

jmri.jmrix.AbstractMRTrafficController

jmri.jmrix.dccpp.DCCppTrafficController

jmri.jmrix.dccpp.DCCppPacketizer

jmri.jmrix.dccpp.dccppovertcp.DCCppOverTcpPacketizer

All Implemented Interfaces:

DCCppInterface

public class DCCppOverTcpPacketizer
extends DCCppPacketizer

Converts Stream-based I/O to/from DCC++ messages. The "DCCppInterface" side sends/receives DCCppMessage objects. The connection to a DCCppPortnetworkController 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

Modifier and Type	Class	Description
(package private) class	DCCppOverTcpPacketizer.RcvHandler	Captive class to handle incoming characters.
(package private) class	DCCppOverTcpPacketizer.XmtHandler	Captive class to handle transmission.

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

AbstractMRTrafficController.RcvNotifier, AbstractMRTrafficController.XmtNotifier

Field Summary

Fields

Modifier and Type	Field	Description
protected BufferedReader	istreamReader
DCCppNetworkPortController	networkController
(package private) static final String	NEW_SERVER_VERSION_STRING
(package private) static final String	OLD_RECEIVE_PREFIX
(package private) static final String	OLD_SEND_PREFIX
(package private) static final String	OLD_SERVER_VERSION_STRING
protected Runnable	rcvHandler	RcvHandler (a local class) object to implement the receive thread
(package private) static final String	RECEIVE_PREFIX
(package private) static final String	SEND_PREFIX
(package private) boolean	useOldPrefix
protected final Runnable	xmtHandler	XmtHandler (a local class) object to implement the transmit thread
protected LinkedList<DCCppMessage>	xmtList	Synchronized list used as a transmit queue.

Fields inherited from class jmri.jmrix.dccpp.DCCppTrafficController

anyReceived, mListenerMasks, 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
DCCppOverTcpPacketizer(DCCppCommandStation cs)

Method Summary

Modifier and Type	Method	Description
void	connectPort(DCCppNetworkPortController p)	Make connection to existing DCCppNetworkPortController object.
void	disconnectPort(DCCppNetworkPortController p)	Break connection to existing DCCppNetworkPortController object.
boolean	isXmtBusy()
void	sendDCCppMessage(DCCppMessage m, DCCppListener reply)	Forward a preformatted DCCppMessage to the actual interface.
void	startThreads()	Invoked at startup to start the threads needed here.
void	terminateThreads()	Terminate the receive and transmit threads.

Methods inherited from class jmri.jmrix.dccpp.DCCppPacketizer

addHeaderToOutput, addTrailerToOutput, loadChars, portReadyToSend

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, 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

Field Details

OLD_RECEIVE_PREFIX

static final String OLD_RECEIVE_PREFIX

See Also:

• Constant Field Values

OLD_SEND_PREFIX

static final String OLD_SEND_PREFIX

See Also:

• Constant Field Values

RECEIVE_PREFIX

static final String RECEIVE_PREFIX

See Also:

• Constant Field Values

SEND_PREFIX

static final String SEND_PREFIX

See Also:

• Constant Field Values

OLD_SERVER_VERSION_STRING

static final String OLD_SERVER_VERSION_STRING

See Also:

• Constant Field Values

NEW_SERVER_VERSION_STRING

static final String NEW_SERVER_VERSION_STRING

See Also:

• Constant Field Values

useOldPrefix

boolean useOldPrefix

istreamReader

protected BufferedReader istreamReader

xmtHandler

protected final Runnable xmtHandler

XmtHandler (a local class) object to implement the transmit thread

rcvHandler

protected Runnable rcvHandler

RcvHandler (a local class) object to implement the receive thread

xmtList

protected LinkedList<DCCppMessage> xmtList

Synchronized list used as a transmit queue.

networkController

public DCCppNetworkPortController networkController

Constructor Details

DCCppOverTcpPacketizer

public DCCppOverTcpPacketizer(DCCppCommandStation cs)

Method Details

isXmtBusy

public boolean isXmtBusy()

connectPort

public void connectPort(DCCppNetworkPortController p)

Make connection to existing DCCppNetworkPortController object.

Parameters:

p - Port networkController for connected. Save this for a later disconnect call

disconnectPort

public void disconnectPort(DCCppNetworkPortController p)

Break connection to existing DCCppNetworkPortController object. Once broken, attempts to send via "message" member will fail.

Parameters:

p - previously connected port

sendDCCppMessage

public void sendDCCppMessage(DCCppMessage m,
 DCCppListener reply)

Forward a preformatted DCCppMessage to the actual interface. Checksum is computed and overwritten here, then the message is converted to a byte array and queue for transmission

Specified by:

sendDCCppMessage in interface DCCppInterface

Overrides:

sendDCCppMessage in class DCCppPacketizer

Parameters:

m - Message to send; will be updated with CRC

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

startThreads

public void startThreads()

Invoked at startup to start the threads needed here.

terminateThreads

public void terminateThreads()

Terminate the receive and transmit threads.

This is intended to be used only by testing subclasses.

Overrides:

terminateThreads in class AbstractMRTrafficController