org.apache.cassandra.db.commitlog

Class CommitLogSegmentManagerStandard

java.lang.Object

org.apache.cassandra.db.commitlog.AbstractCommitLogSegmentManager

org.apache.cassandra.db.commitlog.CommitLogSegmentManagerStandard

public class CommitLogSegmentManagerStandard
extends AbstractCommitLogSegmentManager

Field Summary

Fields inherited from class org.apache.cassandra.db.commitlog.AbstractCommitLogSegmentManager

commitLog

Constructor Summary

Constructors

Constructor and Description
CommitLogSegmentManagerStandard(CommitLog commitLog, java.lang.String storageDirectory)

Method Summary

Modifier and Type	Method and Description
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.
CommitLogSegment	createSegment() Hook to allow segment managers to track state surrounding creation of new segments.
void	discard(CommitLogSegment segment, boolean delete) Indicates that a segment file has been flushed and is no longer needed.

Methods inherited from class org.apache.cassandra.db.commitlog.AbstractCommitLogSegmentManager

awaitManagementTasksCompletion, awaitTermination, getActiveSegments, onDiskSize, shutdown, stopUnsafe, sync

Methods inherited from class java.lang.Object

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

Constructor Detail

CommitLogSegmentManagerStandard

public CommitLogSegmentManagerStandard(CommitLog commitLog,
                                       java.lang.String storageDirectory)

Method Detail

discard

public void discard(CommitLogSegment segment,
                    boolean delete)

Description copied from class: AbstractCommitLogSegmentManager

Indicates that a segment file has been flushed and is no longer needed. Only perform as task submit to segment manager so it's performend on segment management thread, or perform while segment management thread is shutdown during testing resets.

Parameters:

segment - segment to be discarded

delete - whether or not the segment is safe to be deleted.

allocate

public 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. allocate() is blocking until allocation succeeds as it waits on a signal in advanceAllocatingFrom

Specified by:

allocate in class AbstractCommitLogSegmentManager

Parameters:

mutation - mutation to allocate space for

size - total size of mutation (overhead + serialized size)

Returns:

the provided Allocation object

createSegment

public CommitLogSegment createSegment()

Description copied from class: AbstractCommitLogSegmentManager

Hook to allow segment managers to track state surrounding creation of new segments. Onl perform as task submit to segment manager so it's performed on segment management thread.