io.atomix.copycat.server.storage

Class SegmentManager

java.lang.Object

io.atomix.copycat.server.storage.SegmentManager

All Implemented Interfaces:

AutoCloseable

public class SegmentManager
extends Object
implements AutoCloseable

Manages creation and deletion of Segments of the Log.

The segment manager keeps track of segments in a given Log and provides an interface to loading, retrieving, and compacting those segments.

Author:

Jordan Halterman

Constructor Summary

Constructors

Constructor and Description
SegmentManager(String name, Storage storage, Serializer serializer)

Method Summary

Modifier and Type	Method and Description
void	close()
long	commitIndex() Returns the log compact index.
Segment	createSegment(SegmentDescriptor descriptor) Creates a new segment.
Segment	currentSegment() Returns the current segment.
Segment	firstSegment() Returns the first segment in the log.
Segment	lastSegment() Returns the last segment in the log.
Segment	loadSegment(long segmentId, long segmentVersion) Loads a segment.
Segment	nextSegment() Creates and returns the next segment.
void	removeSegment(Segment segment) Removes a segment.
void	replaceSegments(Collection<Segment> segments, Segment segment) Inserts a segment.
Collection<Segment>	reverseSegments() Returns the collection of segments in reverse order.
Segment	segment(long index) Returns the segment for the given index.
Collection<Segment>	segments() Returns the collection of segments.
Serializer	serializer() Returns the entry serializer.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SegmentManager

public SegmentManager(String name,
                      Storage storage,
                      Serializer serializer)

Throws:

NullPointerException - if segments is null

Method Detail

serializer

public Serializer serializer()

Returns the entry serializer.

Returns:

The entry serializer.

commitIndex

public long commitIndex()

Returns the log compact index.

Returns:

The log compact index.

currentSegment

public Segment currentSegment()

Returns the current segment.

Returns:

The current segment.

firstSegment

public Segment firstSegment()

Returns the first segment in the log.

Throws:

IllegalStateException - if the segment manager is not open

lastSegment

public Segment lastSegment()

Returns the last segment in the log.

Throws:

IllegalStateException - if the segment manager is not open

nextSegment

public Segment nextSegment()

Creates and returns the next segment.

Returns:

The next segment.

Throws:

IllegalStateException - if the segment manager is not open

segments

public Collection<Segment> segments()

Returns the collection of segments.

Returns:

An ordered collection of segments.

reverseSegments

public Collection<Segment> reverseSegments()

Returns the collection of segments in reverse order.

Returns:

A reverse ordered collection of segments.

segment

public Segment segment(long index)

Returns the segment for the given index.

Parameters:

index - The index for which to return the segment.

Throws:

IllegalStateException - if the segment manager is not open

replaceSegments

public void replaceSegments(Collection<Segment> segments,
                            Segment segment)

Inserts a segment.

Parameters:

segment - The segment to insert.

Throws:

IllegalStateException - if the segment is unknown

removeSegment

public void removeSegment(Segment segment)

Removes a segment.

Parameters:

segment - The segment to remove.

createSegment

public Segment createSegment(SegmentDescriptor descriptor)

Creates a new segment.

loadSegment

public Segment loadSegment(long segmentId,
                           long segmentVersion)

Loads a segment.

close

public void close()

Specified by:

close in interface AutoCloseable

toString

public String toString()

Overrides:

toString in class Object