org.apache.flume.source.taildir

Class TaildirMatcher

java.lang.Object

org.apache.flume.source.taildir.TaildirMatcher

@InterfaceAudience.Private
 @InterfaceStability.Evolving
public class TaildirMatcher
extends Object

Identifies and caches the files matched by single file pattern for TAILDIR source.

Since file patterns only apply to the fileNames and not the parent dictionaries, this implementation checks the parent directory for modification (additional or removed files update modification time of parent dir) If no modification happened to the parent dir that means the underlying files could only be written to but no need to rerun the pattern matching on fileNames.

This implementation provides lazy caching or no caching. Instances of this class keep the result file list from the last successful execution of getMatchingFiles() function invocation, and may serve the content without hitting the FileSystem for performance optimization.

IMPORTANT: It is assumed that the hosting system provides at least second granularity for both System.currentTimeMillis() and File.lastModified(). Also that system clock is used for file system timestamps. If it is not the case then configure it as uncached. Class is solely for package only usage. Member functions are not thread safe.

See Also:

TaildirSource, ReliableTaildirEventReader, TaildirSourceConfigurationConstants

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
String	getFileGroup()
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getFileGroup

public String getFileGroup()