Package cern.accsoft.steering.jmad.util

Class FileMonitor

java.lang.Object

cern.accsoft.steering.jmad.util.FileMonitor

public class FileMonitor
extends java.lang.Object

polls a file and terminates as soon as it exists.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	FileMonitor.ProcessTerminatedUnexpectedlyException
static class	FileMonitor.WaitingFailedException	Will be thrown, if the waiting fails for some reason.

Constructor Summary

Constructors

Constructor	Description
FileMonitor(java.io.File file)
FileMonitor(java.io.File file, java.lang.Process process)

Method Summary

Modifier and Type	Method	Description
boolean	waitForFile()	waits forever, until the file exists.
boolean	waitForFile(java.lang.Long timeout)	waits until a file exists.

Methods inherited from class java.lang.Object

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

Constructor Detail

FileMonitor

public FileMonitor(java.io.File file)

FileMonitor

public FileMonitor(java.io.File file,
                   java.lang.Process process)

Method Detail

waitForFile

public boolean waitForFile()
                    throws JMadException

waits forever, until the file exists.

Returns:

true, if it exists finally, false, if the monitored process was interrupted

Throws:

FileMonitor.WaitingFailedException - if something goes wrong during waiting

JMadException

waitForFile

public boolean waitForFile(java.lang.Long timeout)
                    throws JMadException

waits until a file exists.

Parameters:

timeout - the maximum millisecs to wait (if null, then we wait forever ...)

Returns:

true, if the file finally exists, false, if the monitored process was interrupted or we timed out.

Throws:

FileMonitor.WaitingFailedException - if something goes wrong during the waiting

JMadException