Package com.arcadedb.engine

Class WALFile

java.lang.Object

com.arcadedb.utility.LockContext

com.arcadedb.engine.WALFile

public class WALFile
extends LockContext

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	WALFile.FLUSH_TYPE
static class	WALFile.WALPage
static class	WALFile.WALTransaction

Field Summary

Fields

Modifier and Type	Field	Description
static long	MAGIC_NUMBER

Constructor Summary

Constructors

Constructor	Description
WALFile(String filePath)

Method Summary

Modifier and Type	Method	Description
boolean	acquire(Callable<Object> callable)	If the WAL is still active, execute the callback.
protected void	append(ByteBuffer buffer)
void	close()
void	drop()
String	getFilePath()
WALFile.WALTransaction	getFirstTransaction()
int	getPendingPagesToFlush()
long	getSize()
Map<String,Object>	getStats()
WALFile.WALTransaction	getTransaction(long pos)
static WALFile.FLUSH_TYPE	getWALFlushType(int txFlushType)
boolean	isOpen()
void	notifyPageFlushed()
void	setActive(boolean active)
String	toString()
static Binary	writeTransactionToBuffer(List<MutablePage> pages, long txId)
void	writeTransactionToFile(DatabaseInternal database, List<MutablePage> pages, WALFile.FLUSH_TYPE sync, WALFile file, long txId, Binary buffer)

Methods inherited from class com.arcadedb.utility.LockContext

executeInLock, lock, manageExceptionInLock, unlock

Methods inherited from class java.lang.Object

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

Field Detail

MAGIC_NUMBER

public static final long MAGIC_NUMBER

See Also:

Constant Field Values

Constructor Detail

WALFile

public WALFile(String filePath)
        throws FileNotFoundException

Throws:

FileNotFoundException

Method Detail

close

public void close()
           throws IOException

Throws:

IOException

isOpen

public boolean isOpen()

drop

public void drop()
          throws IOException

Throws:

IOException

getFirstTransaction

public WALFile.WALTransaction getFirstTransaction()
                                           throws WALException

Throws:

WALException

getPendingPagesToFlush

public int getPendingPagesToFlush()

acquire

public boolean acquire(Callable<Object> callable)

If the WAL is still active, execute the callback. This avoids closing a file where a thread is still writing to it.

Returns:

true if acquired, otherwise false

setActive

public void setActive(boolean active)

getTransaction

public WALFile.WALTransaction getTransaction(long pos)

writeTransactionToBuffer

public static Binary writeTransactionToBuffer(List<MutablePage> pages,
                                              long txId)

writeTransactionToFile

public void writeTransactionToFile(DatabaseInternal database,
                                   List<MutablePage> pages,
                                   WALFile.FLUSH_TYPE sync,
                                   WALFile file,
                                   long txId,
                                   Binary buffer)
                            throws IOException

Throws:

IOException

notifyPageFlushed

public void notifyPageFlushed()

getSize

public long getSize()
             throws IOException

Throws:

IOException

getFilePath

public String getFilePath()

toString

public String toString()

Overrides:

toString in class Object

getStats

public Map<String,Object> getStats()

getWALFlushType

public static WALFile.FLUSH_TYPE getWALFlushType(int txFlushType)

append

protected void append(ByteBuffer buffer)
               throws IOException

Throws:

IOException