com.bigdata.ha.althalog

Interface IHALogWriter

All Known Implementing Classes:

HALogFile.HALogWriter

public interface IHALogWriter

A constrained interface to a new HALogFile to allow writing.

In order to write to an HALogFile, a writer must be requested. The implementation is private to the HALogFile.

Author:

Martyn Cutcher

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Close the file (does not flush).
void	close(IRootBlockView rbv) Writes the closing rootblock to the log file and closes the file to further writes.
long	getCommitCounter() The commit counter for the committed state BEFORE the write set contained in the file is applied.
long	getSequence()
String	toString()
void	write(IHAWriteMessage msg, ByteBuffer data) Writes the message to the file and the associated data if the backing store is not a WORM.

Method Detail

getSequence

long getSequence()

Returns:

the next expected write sequence.

toString

String toString()

Overrides:

toString in class Object

Returns:

a String showing the current state of the writer

write

void write(IHAWriteMessage msg,
         ByteBuffer data)
           throws IOException

Writes the message to the file and the associated data if the backing store is not a WORM.

Parameters:

msg -

data -

Throws:

IOException

close

void close(IRootBlockView rbv)
           throws IOException

Writes the closing rootblock to the log file and closes the file to further writes.

Parameters:

rbv - is the rootblock associated with the commit point

Throws:

IOException

close

void close()
           throws IOException

Close the file (does not flush).

Throws:

IOException

getCommitCounter

long getCommitCounter()

The commit counter for the committed state BEFORE the write set contained in the file is applied.