Module org.yamcs.core

Package org.yamcs.tctm

Class UdpTcTmDataLink

java.lang.Object

com.google.common.util.concurrent.AbstractService

org.yamcs.tctm.AbstractLink

org.yamcs.tctm.AbstractTcTmParamLink

org.yamcs.tctm.UdpTcTmDataLink

All Implemented Interfaces:

com.google.common.util.concurrent.Service, SystemParametersProducer, Link, LinkActionProvider, ParameterDataLink, TcDataLink, TmPacketDataLink

public class UdpTcTmDataLink
extends AbstractTcTmParamLink

A UDP-based link that acts as a client: sending TC and receiving TM on the same socket pair.

Nested Class Summary

Nested classes/interfaces inherited from interface org.yamcs.tctm.Link

Link.Status

Nested classes/interfaces inherited from interface com.google.common.util.concurrent.Service

com.google.common.util.concurrent.Service.Listener, com.google.common.util.concurrent.Service.State

Field Summary

Fields

Modifier and Type	Field	Description
protected String	host
protected long	initialDelay
protected int	port

Fields inherited from class org.yamcs.tctm.AbstractTcTmParamLink

cmdPostProcessor, commandHistoryPublisher, packetCount, packetPreprocessor, parameterCount, parameterSink, updateSimulationTime

Fields inherited from class org.yamcs.tctm.AbstractLink

config, dataInCount, dataOutCount, disabled, eventProducer, LINK_NAMESPACE, linkName, log, timeService, yamcsInstance

Constructor Summary

Constructors

Constructor	Description
UdpTcTmDataLink()

Method Summary

Modifier and Type	Method	Description
protected Link.Status	connectionStatus()	In case the link should be connected (i.e. is running and enabled) this method is called to return the actual connection status
protected void	doDisable()
protected void	doEnable()
protected void	doStart()
protected void	doStop()
String	getDetailedStatus()	Returns a short detail status (one-line)
Spec	getSpec()	Returns the valid configuration of the input args of this link.
void	handleIncomingPacket(byte[] packet)
void	init(String instance, String name, YConfiguration config)	Called at startup to initialize the link.
boolean	sendCommand(PreparedCommand preparedCommand)	Attempt to send the command and return true if the command has been sent or its processing has finished.

Methods inherited from class org.yamcs.tctm.AbstractTcTmParamLink

ackCommand, failedCommand, getDefaultSpec, initTc, initTm, postprocess, processPacket, setCommandHistoryPublisher, setParameterSink, setTmSink

Methods inherited from class org.yamcs.tctm.AbstractLink

addAction, collectSystemParameters, dataIn, dataOut, disable, enable, getAction, getActions, getConfig, getCurrentTime, getDataInCount, getDataOutCount, getEventLoop, getLinkStatus, getName, getParent, getSystemParameters, getYamcsInstance, isDisabled, isRunningAndEnabled, resetCounters, setParent, setupSystemParameters

Methods inherited from class com.google.common.util.concurrent.AbstractService

addListener, awaitRunning, awaitRunning, awaitRunning, awaitTerminated, awaitTerminated, awaitTerminated, doCancelStart, failureCause, isRunning, notifyFailed, notifyStarted, notifyStopped, startAsync, state, stopAsync, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.yamcs.tctm.Link

disable, enable, getConfig, getDataInCount, getDataOutCount, getExtraInfo, getLinkStatus, getName, getParent, isDisabled, isEffectivelyDisabled, resetCounters, setParent, setupSystemParameters

Methods inherited from interface org.yamcs.tctm.ParameterDataLink

isParameterDataLinkImplemented

Methods inherited from interface org.yamcs.parameter.SystemParametersProducer

getFrequency

Methods inherited from interface org.yamcs.tctm.TcDataLink

isCommandingAvailable, isTcDataLinkImplemented

Methods inherited from interface org.yamcs.tctm.TmPacketDataLink

isTmPacketDataLinkImplemented

Field Details

host

protected String host

port

protected int port

initialDelay

protected long initialDelay

Constructor Details

UdpTcTmDataLink

public UdpTcTmDataLink()

Method Details

getSpec

public Spec getSpec()

Description copied from interface: Link

Returns the valid configuration of the input args of this link.

Returns:

the argument specification, or null if the args should not be validated.

init

public void init(String instance,
 String name,
 YConfiguration config)

Description copied from interface: Link

Called at startup to initialize the link.

The config corresponds to the map that is under the link definition in yamcs.instance.yaml.

Specified by:

init in interface Link

Overrides:

init in class AbstractTcTmParamLink

config - - the configuration - cannot be null (but can be empty)

sendCommand

public boolean sendCommand(PreparedCommand preparedCommand)

Description copied from interface: TcDataLink

Attempt to send the command and return true if the command has been sent or its processing has finished.

If false is returned, the LinkManager will attempt to send the command via the next TC link (if any).

The link is expected to update the CommandHistoryPublisher.AcknowledgeSent_KEY ack in the command history if the method returned true. If it returned false, the ack should not be updated (it will be updated by the next link or by the Link Manager if there is other no link).

The link can update the CommandHistoryPublisher.AcknowledgeSent_KEY ack with a negative ack and return true (i.e. the command has not been really sent but it has finished processing).

The return true/false has been introduced in Yamcs 5.6.0. Before that version, the old method sendTc was implicitly returning true. As of Yamcs 5.6.0 most links return true even when they cannot send the command (setting the negative Sent ack).

Throwing an exception is equivalent with returning false, except a error log will be printed (this is considered a bug)

Returns:

connectionStatus

protected Link.Status connectionStatus()

Description copied from class: AbstractLink

In case the link should be connected (i.e. is running and enabled) this method is called to return the actual connection status

Specified by:

connectionStatus in class AbstractLink

doStart

protected void doStart()

Specified by:

doStart in class com.google.common.util.concurrent.AbstractService

doEnable

protected void doEnable()
                 throws Exception

Overrides:

doEnable in class AbstractLink

Throws:

Exception

doDisable

protected void doDisable()
                  throws Exception

Overrides:

doDisable in class AbstractLink

Throws:

Exception

doStop

protected void doStop()

Specified by:

doStop in class com.google.common.util.concurrent.AbstractService

getDetailedStatus

public String getDetailedStatus()

Description copied from interface: Link

Returns a short detail status (one-line)

Specified by:

getDetailedStatus in interface Link

Overrides:

getDetailedStatus in class AbstractLink

handleIncomingPacket

public void handleIncomingPacket(byte[] packet)