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

Class AbstractWALBuffer

java.lang.Object

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

All Implemented Interfaces:

java.lang.AutoCloseable, IWALBuffer

Direct Known Subclasses:

WALBuffer

public abstract class AbstractWALBuffer
extends java.lang.Object
implements IWALBuffer

Field Summary

Fields

Modifier and Type	Field	Description
protected long	currentSearchIndex	current search index
protected java.util.concurrent.atomic.AtomicLong	currentWALFileVersion	current wal file version id
protected WALWriter	currentWALFileWriter	current wal file log writer
protected java.lang.String	identifier	WALNode identifier of this buffer
protected java.lang.String	logDirectory	directory to store .wal files

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
long	getCurrentSearchIndex()	Get current search index
long	getCurrentWALFileSize()	Get current wal file's size
long	getCurrentWALFileVersion()	Get current log version id
protected void	rollLogWriter(long searchIndex, WALFileStatus fileStatus)	Notice: only called by syncBufferThread and old log writer will be closed by this function.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.iotdb.db.wal.buffer.IWALBuffer

close, isAllWALEntriesConsumed, waitForFlush, waitForFlush, write

Field Detail

identifier

protected final java.lang.String identifier

WALNode identifier of this buffer

logDirectory

protected final java.lang.String logDirectory

directory to store .wal files

currentWALFileVersion

protected final java.util.concurrent.atomic.AtomicLong currentWALFileVersion

current wal file version id

currentSearchIndex

protected volatile long currentSearchIndex

current search index

currentWALFileWriter

protected volatile WALWriter currentWALFileWriter

current wal file log writer

Constructor Detail

AbstractWALBuffer

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

Throws:

java.io.FileNotFoundException

Method Detail

getCurrentWALFileVersion

public long getCurrentWALFileVersion()

Description copied from interface: IWALBuffer

Get current log version id

Specified by:

getCurrentWALFileVersion in interface IWALBuffer

getCurrentWALFileSize

public long getCurrentWALFileSize()

Description copied from interface: IWALBuffer

Get current wal file's size

Specified by:

getCurrentWALFileSize in interface IWALBuffer

rollLogWriter

protected void rollLogWriter(long searchIndex,
                             WALFileStatus fileStatus)
                      throws java.io.IOException

Notice: only called by syncBufferThread and old log writer will be closed by this function.

Throws:

java.io.IOException

getCurrentSearchIndex

public long getCurrentSearchIndex()

Description copied from interface: IWALBuffer

Get current search index

Specified by:

getCurrentSearchIndex in interface IWALBuffer