Package org.apache.iotdb.db.wal.io

Class WALWriter

java.lang.Object

org.apache.iotdb.db.wal.io.LogWriter

org.apache.iotdb.db.wal.io.WALWriter

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, ILogWriter

public class WALWriter
extends LogWriter

WALWriter writes the binary WALEntry into .wal file.

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	MAGIC_STRING
static int	MAGIC_STRING_BYTES
protected WALMetaData	metaData	wal files' metadata

Fields inherited from class org.apache.iotdb.db.wal.io.LogWriter

logChannel, logFile, logStream, size

Constructor Summary

Constructors

Constructor	Description
WALWriter(java.io.File logFile)

Method Summary

Modifier and Type	Method	Description
void	close()
WALFileStatus	getWalFileStatus()
void	updateFileStatus(WALFileStatus walFileStatus)
void	updateMetaData(WALMetaData metaData)
void	write(java.nio.ByteBuffer buffer, WALMetaData metaData)	Writes buffer and update its' metadata

Methods inherited from class org.apache.iotdb.db.wal.io.LogWriter

force, force, getLogFile, size, write

Methods inherited from class java.lang.Object

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

Field Detail

MAGIC_STRING

public static final java.lang.String MAGIC_STRING

See Also:

Constant Field Values

MAGIC_STRING_BYTES

public static final int MAGIC_STRING_BYTES

metaData

protected final WALMetaData metaData

wal files' metadata

Constructor Detail

WALWriter

public WALWriter(java.io.File logFile)
          throws java.io.FileNotFoundException

Throws:

java.io.FileNotFoundException

Method Detail

write

public void write(java.nio.ByteBuffer buffer,
                  WALMetaData metaData)
           throws java.io.IOException

Writes buffer and update its' metadata

Throws:

java.io.IOException

updateMetaData

public void updateMetaData(WALMetaData metaData)

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Overrides:

close in class LogWriter

Throws:

java.io.IOException

updateFileStatus

public void updateFileStatus(WALFileStatus walFileStatus)

getWalFileStatus

public WALFileStatus getWalFileStatus()