Package org.apache.iotdb.db.wal.buffer

Class WALBuffer

java.lang.Object

org.apache.iotdb.db.wal.buffer.AbstractWALBuffer

org.apache.iotdb.db.wal.buffer.WALBuffer

All Implemented Interfaces:

java.lang.AutoCloseable, IWALBuffer

public class WALBuffer
extends AbstractWALBuffer

This buffer guarantees the concurrent safety and uses double buffers mechanism to accelerate writes and avoid waiting for buffer syncing to disk.

Field Summary

Fields

Modifier and Type	Field	Description
protected WALFileStatus	currentFileStatus	file status of working buffer, updating file writer's status when syncing

Fields inherited from class org.apache.iotdb.db.wal.buffer.AbstractWALBuffer

currentSearchIndex, currentWALFileVersion, currentWALFileWriter, identifier, logDirectory

Constructor Summary

Constructors

Constructor	Description
WALBuffer(java.lang.String identifier, java.lang.String logDirectory)
WALBuffer(java.lang.String identifier, java.lang.String logDirectory, long startFileVersion, long startSearchIndex)

Method Summary

Modifier and Type	Method	Description
void	close()
boolean	isAllWALEntriesConsumed()
void	waitForFlush()	Wait for next flush operation done
boolean	waitForFlush(long time, java.util.concurrent.TimeUnit unit)	Wait for next flush operation done
void	write(WALEntry walEntry)	Write WALEntry into wal buffer.

Methods inherited from class org.apache.iotdb.db.wal.buffer.AbstractWALBuffer

getCurrentSearchIndex, getCurrentWALFileSize, getCurrentWALFileVersion, rollLogWriter

Methods inherited from class java.lang.Object

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

Field Detail

currentFileStatus

protected volatile WALFileStatus currentFileStatus

file status of working buffer, updating file writer's status when syncing

Constructor Detail

WALBuffer

public WALBuffer(java.lang.String identifier,
                 java.lang.String logDirectory)
          throws java.io.FileNotFoundException

Throws:

java.io.FileNotFoundException

WALBuffer

public WALBuffer(java.lang.String identifier,
                 java.lang.String logDirectory,
                 long startFileVersion,
                 long startSearchIndex)
          throws java.io.FileNotFoundException

Throws:

java.io.FileNotFoundException

Method Detail

write

public void write(WALEntry walEntry)

Description copied from interface: IWALBuffer

Write WALEntry into wal buffer.

Parameters:

walEntry - info will be written into wal buffer

waitForFlush

public void waitForFlush()
                  throws java.lang.InterruptedException

Description copied from interface: IWALBuffer

Wait for next flush operation done

Throws:

java.lang.InterruptedException

waitForFlush

public boolean waitForFlush(long time,
                            java.util.concurrent.TimeUnit unit)
                     throws java.lang.InterruptedException

Description copied from interface: IWALBuffer

Wait for next flush operation done

Throws:

java.lang.InterruptedException

close

public void close()

isAllWALEntriesConsumed

public boolean isAllWALEntriesConsumed()