com.bigdata.rawstore

Class TransientResourceMetadata

java.lang.Object

com.bigdata.rawstore.TransientResourceMetadata

All Implemented Interfaces:

IResourceMetadata, Serializable, Cloneable

public final class TransientResourceMetadata
extends Object
implements IResourceMetadata

Static class since must be Serializable.

Version:

$Id: AbstractBTree.java 4336 2011-03-24 01:04:33Z thompsonbry $

Author:

Bryan Thompson

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
TransientResourceMetadata(UUID uuid)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(IResourceMetadata o) Compares two resource metadata objects for consistent state.
long	getCommitTime() The commit time of the view from which the caller should read.
long	getCreateTime() The commit time associated with the creation of this resource.
String	getFile() The name of the file containing the resource (this is always relative to some local data directory).
UUID	getUUID() The unique identifier for the resource.
boolean	isIndexSegment() True iff this resource is an IndexSegment.
boolean	isJournal() True iff this resource is a Journal.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.bigdata.mdi.IResourceMetadata

hashCode

Constructor Detail

TransientResourceMetadata

public TransientResourceMetadata(UUID uuid)

Method Detail

isJournal

public boolean isJournal()

Description copied from interface: IResourceMetadata

True iff this resource is a Journal. When the resource is a Journal, there will be a named mutable btree on the journal that is absorbing writes for one or more index partition of a scale-out index.

Specified by:

isJournal in interface IResourceMetadata

isIndexSegment

public boolean isIndexSegment()

Description copied from interface: IResourceMetadata

True iff this resource is an IndexSegment. Each IndexSegment contains historical read-only data for exactly one partition of a scale-out index.

Specified by:

isIndexSegment in interface IResourceMetadata

equals

public boolean equals(IResourceMetadata o)

Description copied from interface: IResourceMetadata

Compares two resource metadata objects for consistent state.

Specified by:

equals in interface IResourceMetadata

Returns:

getCreateTime

public long getCreateTime()

Description copied from interface: IResourceMetadata

The commit time associated with the creation of this resource. When the index is an IndexSegment this is the commit time of the view from which that IndexSegment was generated. When the resource is a Journal, the create time is the commit time associated with the journal creation, which is generally an overflow operation. Regardless, the create time MUST be assigned by the same time source that is used to assign commit timestamps.

Specified by:

getCreateTime in interface IResourceMetadata

getCommitTime

public long getCommitTime()

Description copied from interface: IResourceMetadata

The commit time of the view from which the caller should read. For an IndexSegment, this is always the same as IResourceMetadata.getCreateTime() . For a Journal, this may be a specific commit time for a source in an ILocalBTreeView. A value of 0L indicates that no specific commit time is indicated. For historical journals, this implies a read from the lastCommitTime on the journal in order to constitute the view. For the current journal, this implies a read at whatever timestamp the caller desires.

Specified by:

getCommitTime in interface IResourceMetadata

See Also:

IndexManager

getFile

public String getFile()

Description copied from interface: IResourceMetadata

The name of the file containing the resource (this is always relative to some local data directory).

Note: This property is primarily used for debugging. It is NOT used by the ResourceManager. Instead, the ResourceManager builds up the mapping from resource UUID to local filename during startup.

Specified by:

getFile in interface IResourceMetadata

getUUID

public UUID getUUID()

Description copied from interface: IResourceMetadata

The unique identifier for the resource.

Specified by:

getUUID in interface IResourceMetadata

See Also:

IRootBlockView#getUUID(), the UUID for an {@link AbstractJournal}., IndexSegmentCheckpoint#segmentUUID, the UUID for an {@link IndexSegment}.