Package org.apache.nifi.util.file.monitor

Class SynchronousFileWatcher

java.lang.Object

org.apache.nifi.util.file.monitor.SynchronousFileWatcher

public class SynchronousFileWatcher
extends Object

Allows the user to configure a Path to watch for modifications and periodically poll to check if the file has been modified

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	SynchronousFileWatcher.StateWrapper

Field Summary

Fields

Modifier and Type	Field	Description
private final long	checkUpdateMillis
private final AtomicReference<SynchronousFileWatcher.StateWrapper>	lastState
private final UpdateMonitor	monitor
private final Path	path
private final Lock	resourceLock

Constructor Summary

Constructors

Constructor	Description
SynchronousFileWatcher(Path path, UpdateMonitor monitor)
SynchronousFileWatcher(Path path, UpdateMonitor monitor, long checkMillis)

Method Summary

Modifier and Type	Method	Description
boolean	checkAndReset()	Checks if the file has been updated according to the configured UpdateMonitor and resets the state
private boolean	checkForUpdate()

Methods inherited from class java.lang.Object

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

Field Details

path

private final Path path

checkUpdateMillis

private final long checkUpdateMillis

monitor

private final UpdateMonitor monitor

lastState

private final AtomicReference<SynchronousFileWatcher.StateWrapper> lastState

resourceLock

private final Lock resourceLock

Constructor Details

SynchronousFileWatcher

public SynchronousFileWatcher(Path path,
 UpdateMonitor monitor)

SynchronousFileWatcher

public SynchronousFileWatcher(Path path,
 UpdateMonitor monitor,
 long checkMillis)

Method Details

checkAndReset

public boolean checkAndReset()
                      throws IOException

Checks if the file has been updated according to the configured UpdateMonitor and resets the state

Returns:

true if updated; false if not updated or if not yet time to check

Throws:

IOException - if failure occurs checking for changes

checkForUpdate

private boolean checkForUpdate()
                        throws IOException

Throws:

IOException