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 and Description
private static class	SynchronousFileWatcher.StateWrapper

Field Summary

Fields

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

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and 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 Detail

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 Detail

SynchronousFileWatcher

public SynchronousFileWatcher(Path path,
                              UpdateMonitor monitor)

SynchronousFileWatcher

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

Method Detail

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 otherwise

Throws:

IOException - if failure occurs checking for changes

checkForUpdate

private boolean checkForUpdate()
                        throws IOException

Throws:

IOException