org.apache.cassandra.db.commitlog

Class CommitLogSegmentManager

java.lang.Object

org.apache.cassandra.db.commitlog.CommitLogSegmentManager

public class CommitLogSegmentManager
extends java.lang.Object

Performs eager-creation of commit log segments in a background thread. All the public methods are thread safe.

Method Summary

Modifier and Type	Method and Description
org.apache.cassandra.db.commitlog.CommitLogSegment.Allocation	allocate(Mutation mutation, int size) Reserve space in the current segment for the provided mutation or, if there isn't space available, create a new segment.
void	awaitTermination() Returns when the management thread terminates.
java.util.Collection<CommitLogSegment>	getActiveSegments()
boolean	manages(java.lang.String name)
long	onDiskSize()
void	shutdown() Initiates the shutdown process for the management thread.
void	stopUnsafe(boolean deleteSegments) Stops CL, for testing purposes.

Methods inherited from class java.lang.Object

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

Method Detail

allocate

public org.apache.cassandra.db.commitlog.CommitLogSegment.Allocation allocate(Mutation mutation,
                                                                              int size)

Reserve space in the current segment for the provided mutation or, if there isn't space available, create a new segment.

Returns:

the provided Allocation object

onDiskSize

public long onDiskSize()

Returns:

the space (in bytes) used by all segment files.

manages

public boolean manages(java.lang.String name)

Parameters:

name - the filename to check

Returns:

true if file is managed by this manager.

stopUnsafe

public void stopUnsafe(boolean deleteSegments)

Stops CL, for testing purposes. DO NOT USE THIS OUTSIDE OF TESTS. Only call this after the AbstractCommitLogService is shut down.

shutdown

public void shutdown()

Initiates the shutdown process for the management thread.

awaitTermination

public void awaitTermination()
                      throws java.lang.InterruptedException

Returns when the management thread terminates.

Throws:

java.lang.InterruptedException

getActiveSegments

public java.util.Collection<CommitLogSegment> getActiveSegments()

Returns:

a read-only collection of the active commit log segments