com.saperion.ngc.servlet.process

Class LongRunningProcess

java.lang.Object

java.lang.Thread

com.saperion.ngc.servlet.process.LongRunningProcess

All Implemented Interfaces:

Runnable

Direct Known Subclasses:

ExportProcess, PdfRenderProcess

public abstract class LongRunningProcess
extends Thread

Abstract class for processes that might take a long time to run. The processes are executed by the LongRunningProcessServlet. Because a LongRunningProcess is a thread, classes that extend this class must override Thread.run().

Nested Class Summary

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

Thread.State, Thread.UncaughtExceptionHandler

Field Summary

Fields

Modifier and Type	Field and Description
protected LRPControlBean	bean Control bean for this process.
protected boolean	canceled If the process was canceled.
protected NewConnectionClassicConnectorProvider	connectionProvider Connection provider that provides a new connection for this process.
static String	CONTROL_BEAN_SESSION_ATTR Name of the session attribute used to store the control bean for long running processes.
protected boolean	error If an error occurred.
protected int	progress Current progress (percent).
protected javax.servlet.http.HttpSession	session Current session.

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

Constructors

Constructor and Description
LongRunningProcess(LRPControlBean bean, javax.servlet.http.HttpSession session)

Method Summary

Modifier and Type	Method and Description
void	cancel() Cancels the process.
int	getProgress()
boolean	isError()
protected void	updateProgress(int currentElement, int totalElements) Updates the progress.
abstract void	writeResult(javax.servlet.http.HttpServletResponse response) Writes the result of the process to the output-stream.

Methods inherited from class java.lang.Thread

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

Methods inherited from class java.lang.Object

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

Field Detail

CONTROL_BEAN_SESSION_ATTR

public static final String CONTROL_BEAN_SESSION_ATTR

Name of the session attribute used to store the control bean for long running processes.

See Also:

Constant Field Values

bean

protected final LRPControlBean bean

Control bean for this process.

session

protected final javax.servlet.http.HttpSession session

Current session.

progress

protected int progress

Current progress (percent).

error

protected boolean error

If an error occurred.

canceled

protected boolean canceled

If the process was canceled.

connectionProvider

protected NewConnectionClassicConnectorProvider connectionProvider

Connection provider that provides a new connection for this process. Each process must take care of logging-off the connector when it is no longer in use.

Constructor Detail

LongRunningProcess

public LongRunningProcess(LRPControlBean bean,
                          javax.servlet.http.HttpSession session)

Parameters:

bean - bean containing information for the process

session - the current session

Method Detail

writeResult

public abstract void writeResult(javax.servlet.http.HttpServletResponse response)
                          throws IOException,
                                 SystemException

Writes the result of the process to the output-stream.

Parameters:

response - servlet response to write to

Throws:

IOException - IO Exception when writing

SystemException - generic exception when writing

updateProgress

protected void updateProgress(int currentElement,
                              int totalElements)

Updates the progress.

Parameters:

currentElement - element currently being processed

totalElements - total number of elements

getProgress

public int getProgress()

Returns:

the current progress

isError

public boolean isError()

Returns:

true if an error occurred

cancel

public void cancel()

Cancels the process.