Package wt.util

Class WTThread

java.lang.Object

java.lang.Thread

wt.util.WTThread

All Implemented Interfaces:

Runnable

public class WTThread
extends Thread

A thread that is associated with a WTContext and supports property change events. This thread class is a Java Bean with bound properties for providing feedback from the actions taking place within the thread. It also supports two forms of cancellation, simple local thread interrupt and remote activity cancellation.

This class contains the usual constructors for thread objects, but ThreadGroup arguments have been replaced with Component arguments. The WTContext associated with the given Component is used to determine the thread group of the new thread.

For convenience, an additional start method is provided that allows the calling thread to wait until the WTThread calls ready. This simplifies the common task of synchronizing the new thread's access to volatile state that could be affected if the calling thread is allowed to continue.

Supported API: true
Extendable: true

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

Thread.State, Thread.UncaughtExceptionHandler

Field Summary

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

Constructors

Constructor	Description
WTThread()	Construct a new WTThread object.
WTThread(Component component)	Construct a new WTThread object.
WTThread(Component component, Runnable target)	Construct a new WTThread object with the target Runnable.
WTThread(Component component, Runnable target, String name)	Construct a new WTThread object with the target Runnable and given name.
WTThread(Component component, String name)	Construct a new WTThread object with the given name.
WTThread(Runnable target)	Construct a new WTThread object with the target Runnable.
WTThread(Runnable target, String name)	Construct a new WTThread object with the target Runnable and given name.
WTThread(String name)	Construct a new WTThread object with the given name.
WTThread(ThreadGroup thread_group)	Construct a new WTThread object.
WTThread(ThreadGroup thread_group, Runnable target)	Construct a new WTThread object with the target Runnable.
WTThread(ThreadGroup thread_group, Runnable target, String name)	Construct a new WTThread object with the target Runnable and given name.
WTThread(ThreadGroup thread_group, String name)	Construct a new WTThread object with the given name.

Method Summary

Modifier and Type	Method	Description
void	addPropertyChangeListener(PropertyChangeListener listener)	Add a PropertyChangeListener to the listener list.
void	cancel()	Cancel (interrupt) current server-side processing being performed by this thread.
static void	currentProgressCount(int progress_count)	Set the progress count for the current thread.
static void	currentProgressPercent(int progress_percent)	Set the percentage complete for the current thread.
static void	currentStatus(String status)	Set the status message for the current thread.
protected void	firePropertyChange(String property_name, int old_value, int new_value)	Report a bound property update to any registered listeners.
protected void	firePropertyChange(String property_name, Object old_value, Object new_value)	Report a bound property update to any registered listeners.
int	getProgressCount()	Get the propress count.
int	getProgressPercent()	Get the percentage complete.
String	getStatus()	Get the status message.
String	getWtThreadState()	Get the state property.
void	interrupt()	Interrupt this thread.
boolean	isInterrupted()	Check if this thread has been interrupted.
void	ready()	Notify parent thread that this thread is now ready for it to continue.
void	removePropertyChangeListener(PropertyChangeListener listener)	Remove a PropertyChangeListener from the listener list.
void	run()	Run method.
void	setInterruptHandler(Runnable interrupt_handler)	Set an interrupt handler for this thread.
void	setProgressCount(int progress_count)	Set the progress count.
void	setProgressPercent(int progress_percent)	Set the percentage complete.
void	setStatus(String status)	Set the status message.
boolean	start(boolean wait)	Start this thread and optionally wait until the thread signals the caller to continue.

Methods inherited from class java.lang.Thread

activeCount, checkAccess, clone, countStackFrames, currentThread, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupted, isAlive, isDaemon, join, join, join, onSpinWait, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

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

Constructor Details

WTThread

public WTThread()

Construct a new WTThread object. The new thread becomes a member of the thread group associated with the current WTContext object.

Supported API: true

See Also:

• WTContext

WTThread

public WTThread(Runnable target)

Construct a new WTThread object with the target Runnable. The new thread becomes a member of the thread group associated with the current WTContext object.

Supported API: true

Parameters:

target - the target Runnable

See Also:

• WTContext

WTThread

public WTThread(Runnable target,
 String name)

Construct a new WTThread object with the target Runnable and given name. The new thread becomes a member of the thread group associated with the current WTContext object.

Supported API: true

Parameters:

target - the target Runnable

name - the thread name

See Also:

• WTContext

WTThread

public WTThread(String name)

Construct a new WTThread object with the given name. The new thread becomes a member of the thread group associated with the current WTContext object.

Supported API: true

Parameters:

name - the thread name

See Also:

• WTContext

WTThread

public WTThread(Component component)

Construct a new WTThread object. The new thread becomes a member of the thread group associated with the given Component object.

Supported API: true

Parameters:

component - the component that determines thread group.

See Also:

• WTContext

WTThread

public WTThread(Component component,
 Runnable target)

Construct a new WTThread object with the target Runnable. The new thread becomes a member of the thread group associated with the given Component object.

Supported API: true

Parameters:

component - the Component that determines thread group.

target - the target Runnable

See Also:

• WTContext

WTThread

public WTThread(Component component,
 Runnable target,
 String name)

Construct a new WTThread object with the target Runnable and given name. The new thread becomes a member of the thread group associated with the given Component object.

Supported API: true

Parameters:

component - the Component that determines thread group.

target - the target Runnable

name - the thread name

See Also:

• WTContext

WTThread

public WTThread(Component component,
 String name)

Construct a new WTThread object with the given name. The new thread becomes a member of the thread group associated with the given Component object.

Supported API: true

Parameters:

component - the Component that determines thread group.

name - the thread name

See Also:

• WTContext

WTThread

public WTThread(ThreadGroup thread_group)

Construct a new WTThread object. The new thread becomes a member of the passed ThreadGroup

Supported API: true

Parameters:

thread_group - the ThreadGroup that this thread is to be part of

See Also:

• WTContext

WTThread

public WTThread(ThreadGroup thread_group,
 Runnable target)

Construct a new WTThread object with the target Runnable. The new thread becomes a member of the passed ThreadGroup Component object.

Supported API: true

Parameters:

thread_group - the ThreadGroup that this thread is to be part of

target - the target Runnable

See Also:

• WTContext

WTThread

public WTThread(ThreadGroup thread_group,
 Runnable target,
 String name)

Construct a new WTThread object with the target Runnable and given name. The new thread becomes a member of the passed ThreadGroup

Supported API: true

Parameters:

thread_group - the ThreadGroup that this thread is to be part of

target - the target Runnable

name - the thread name

See Also:

• WTContext

WTThread

public WTThread(ThreadGroup thread_group,
 String name)

Construct a new WTThread object with the given name. The new thread becomes a member of the passed ThreadGroup

Supported API: true

Parameters:

thread_group - the ThreadGroup that this thread is to be part of

name - the thread name

See Also:

• WTContext

Method Details

start

public boolean start(boolean wait)

Start this thread and optionally wait until the thread signals the caller to continue. If wait is true, the calling thread waits until the new thread calls ready. This gives the new thread an opportunity to access any volatile state before proceeding. This method returns a boolean value to indicate whether the thread was started successfully or the caller was interrupted while waiting.

Supported API: true

Parameters:

wait - calling thread should wait until this thread signals ready

Returns:

true if thread started successfully, false if waiting was interrupted

ready

public void ready()

Notify parent thread that this thread is now ready for it to continue.

Supported API: true

run

public void run()

Run method. This method overrides the default run method to fire property change events for the state property.

Supported API: true

Specified by:

run in interface Runnable

Overrides:

run in class Thread

addPropertyChangeListener

public void addPropertyChangeListener(PropertyChangeListener listener)

Add a PropertyChangeListener to the listener list.

Supported API: true

Parameters:

listener - the PropertyChangeListener to be added

removePropertyChangeListener

public void removePropertyChangeListener(PropertyChangeListener listener)

Remove a PropertyChangeListener from the listener list.

Supported API: true

Parameters:

listener - the PropertyChangeListener to be removed

firePropertyChange

protected void firePropertyChange(String property_name,
 Object old_value,
 Object new_value)

Report a bound property update to any registered listeners. No event is fired if old and new are equal and non-null.

Supported API: true

Parameters:

property_name - the programmatic name of the property that was changed

old_value - the old value of the property

new_value - the new value of the property

firePropertyChange

protected void firePropertyChange(String property_name,
 int old_value,
 int new_value)

Report a bound property update to any registered listeners. No event is fired if old and new are equal and non-null.

Supported API: true

Parameters:

property_name - the programmatic name of the property that was changed

old_value - the old value of the property

new_value - the new value of the property

getWtThreadState

public String getWtThreadState()

Get the state property.

Supported API: true

Returns:

the state property

setStatus

public void setStatus(String status)

Set the status message.

Supported API: true

Parameters:

status - the status message string

getStatus

public String getStatus()

Get the status message.

Supported API: true

Returns:

the status message string

setProgressPercent

public void setProgressPercent(int progress_percent)

Set the percentage complete.

Supported API: true

Parameters:

progress_percent - percentage complete as an integer

getProgressPercent

public int getProgressPercent()

Get the percentage complete.

Supported API: true

Returns:

percentage complete as an integer

setProgressCount

public void setProgressCount(int progress_count)

Set the progress count.

Supported API: true

Parameters:

progress_count - progress count as an integer

getProgressCount

public int getProgressCount()

Get the propress count.

Supported API: true

Returns:

progress count as an integer

currentStatus

public static void currentStatus(String status)

Set the status message for the current thread. Ignored if the current thread is not an instance of WTThread.

Supported API: true

Parameters:

status - the status message string

currentProgressPercent

public static void currentProgressPercent(int progress_percent)

Set the percentage complete for the current thread. Ignored if the current thread is not an instance of WTThread.

Supported API: true

Parameters:

progress_percent - percentage complete as an integer

currentProgressCount

public static void currentProgressCount(int progress_count)

Set the progress count for the current thread. Ignored if the current thread is not an instance of WTThread.

Supported API: true

Parameters:

progress_count - percentage complete as an integer

setInterruptHandler

public void setInterruptHandler(Runnable interrupt_handler)

Set an interrupt handler for this thread. An interrupt handler is run when this thread is interrupted. It can be used to perform cleanup associated with interrupting this thread, such as interrupting of a remote thread in a server.

Supported API: true

interrupt

public void interrupt()

Interrupt this thread. If an interrupt handler has been set, it will be run.

Supported API: true

Overrides:

interrupt in class Thread

isInterrupted

public boolean isInterrupted()

Check if this thread has been interrupted. If thread interrupt is not supported (Netscape Communicator 4.0.4), this method will still return true the first time called after the interrupt method has been invoked.

Supported API: true

Overrides:

isInterrupted in class Thread

Returns:

true if this thread has been interrupted.

cancel

public void cancel()

Cancel (interrupt) current server-side processing being performed by this thread. The local thread is not interrupted. Instead, the server-side operation is interrupted and should return an exception to the local thread.

This method runs the thread's interrupt handler if it has been set. The interrupt handler is run in the same thread group as this thread.

Supported API: true