com.inductiveautomation.ignition.common.expressions.functions

Class AbstractPollingFunction

java.lang.Object

com.inductiveautomation.ignition.common.expressions.functions.BaseFunction

com.inductiveautomation.ignition.common.expressions.functions.AbstractFunction

com.inductiveautomation.ignition.common.expressions.functions.AbstractPollingFunction

All Implemented Interfaces:

Function, java.awt.event.ActionListener, java.util.EventListener

Direct Known Subclasses:

ClientFunctionFactory.IsAlarmActiveFunctionClient, DefaultFunctionFactory.NowFunction, ScriptFunction

public abstract class AbstractPollingFunction
extends AbstractFunction
implements java.awt.event.ActionListener

Field Summary

Fields

Modifier and Type	Field and Description
protected BaseContext	context
protected int	rate
protected boolean	started
protected java.util.TimerTask	task
protected static java.util.Timer	timer
protected InteractionListener	updateListener

Constructor Summary

Constructors

Constructor and Description
AbstractPollingFunction()

Method Summary

Modifier and Type	Method and Description
void	actionPerformed(java.awt.event.ActionEvent e) NOTE: This is in an "action listener" for legacy reasons, and doesn't need to be anymore.
protected void	cancelTask()
void	connect(BaseContext context, InteractionListener updateListener) Empty implementation from BaseFunction.
abstract Function	copy() Returns this.
void	disconnect() Empty implementation from BaseFunction.
protected void	setPollRate(int rate) Updates the poll rate.
void	shutdown() Empty implementation from BaseFunction.
protected void	startTask()
void	startup() Empty implementation from BaseFunction.

Methods inherited from class com.inductiveautomation.ignition.common.expressions.functions.AbstractFunction

getFunctionDisplayName, initArgs, validateArgType, validateNumArgs

Methods inherited from class com.inductiveautomation.ignition.common.expressions.functions.BaseFunction

executeAll

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.inductiveautomation.ignition.common.expressions.functions.Function

execute, getArgDocString, getType

Field Detail

timer

protected static final java.util.Timer timer

context

protected BaseContext context

updateListener

protected InteractionListener updateListener

task

protected java.util.TimerTask task

rate

protected int rate

started

protected boolean started

Constructor Detail

AbstractPollingFunction

public AbstractPollingFunction()

Method Detail

connect

public void connect(BaseContext context,
                    InteractionListener updateListener)

Description copied from class: BaseFunction

Empty implementation from BaseFunction. Override if necessary.

Specified by:

connect in interface Function

Overrides:

connect in class BaseFunction

disconnect

public void disconnect()

Description copied from class: BaseFunction

Empty implementation from BaseFunction. Override if necessary.

Specified by:

disconnect in interface Function

Overrides:

disconnect in class BaseFunction

shutdown

public void shutdown()

Description copied from class: BaseFunction

Empty implementation from BaseFunction. Override if necessary.

Specified by:

shutdown in interface Function

Overrides:

shutdown in class BaseFunction

startup

public void startup()

Description copied from class: BaseFunction

Empty implementation from BaseFunction. Override if necessary.

Specified by:

startup in interface Function

Overrides:

startup in class BaseFunction

startTask

protected void startTask()

cancelTask

protected void cancelTask()

copy

public abstract Function copy()

Description copied from class: BaseFunction

Returns this. Override to create a clone if you need a unique function object per Expression.

Specified by:

copy in interface Function

Overrides:

copy in class BaseFunction

Returns:

setPollRate

protected void setPollRate(int rate)

Updates the poll rate. If the rate is <= 0, polling is disabled.

Parameters:

rate -

actionPerformed

public void actionPerformed(java.awt.event.ActionEvent e)

NOTE: This is in an "action listener" for legacy reasons, and doesn't need to be anymore. However, since we switched the timer in 7.7.6, we needed to maintain backwards compatibility with any sub classes that might override this function.

Specified by:

actionPerformed in interface java.awt.event.ActionListener