Package org.apache.hadoop.hdfs.util

Class BestEffortLongFile

java.lang.Object

org.apache.hadoop.hdfs.util.BestEffortLongFile

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

@Private
public class BestEffortLongFile
extends java.lang.Object
implements java.io.Closeable

Class that represents a file on disk which stores a single long value, but does not make any effort to make it truly durable. This is in contrast to PersistentLongFile which fsync()s the value on every change. This should be used for values which are updated frequently (such that performance is important) and not required to be up-to-date for correctness. This class also differs in that it stores the value as binary data instead of a textual string.

Constructor Summary

Constructors

Constructor	Description
BestEffortLongFile(java.io.File file, long defaultVal)

Method Summary

Modifier and Type	Method	Description
void	close()
long	get()
void	set(long newVal)

Methods inherited from class java.lang.Object

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

Constructor Detail

BestEffortLongFile

public BestEffortLongFile(java.io.File file,
                          long defaultVal)

Method Detail

get

public long get()
         throws java.io.IOException

Throws:

java.io.IOException

set

public void set(long newVal)
         throws java.io.IOException

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Throws:

java.io.IOException