com.bigdata.mdi
Class JournalMetadata

java.lang.Object
  com.bigdata.mdi.AbstractResourceMetadata
      com.bigdata.mdi.JournalMetadata

All Implemented Interfaces:

IResourceMetadata, Params, Externalizable, Serializable, Cloneable

public class JournalMetadata
extends AbstractResourceMetadata

Metadata required to locate a Journal resource.

Version:

$Id: JournalMetadata.java 2547 2010-03-24 20:44:07Z thompsonbry $

Author:

Bryan Thompson

See Also:

Serialized Form

Field Summary

Fields inherited from class com.bigdata.mdi.AbstractResourceMetadata

log

Constructor Summary

JournalMetadata()
De-serialization constructor.

JournalMetadata(AbstractJournal journal)
The description of a journal.

JournalMetadata(AbstractJournal journal, long commitTime)
Constructor variant used to indicate a read from a specific commitTime on a journal.

JournalMetadata(File file, UUID uuid, long createTime, long commitTime)
Data only constructor used by some unit tests.

Method Summary

boolean	isIndexSegment() True iff this resource is an IndexSegment.
boolean	isJournal() True iff this resource is a Journal.

Methods inherited from class com.bigdata.mdi.AbstractResourceMetadata

equals, equals, getCommitTime, getCreateTime, getFile, getParams, getUUID, hashCode, readExternal, toString, writeExternal

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

JournalMetadata

public JournalMetadata()

De-serialization constructor.

JournalMetadata

public JournalMetadata(AbstractJournal journal)

The description of a journal. The JournalMetadata state will not change as writes are made on the journal since it does not reflect anything exception the UUID, the filename, and the create time.

Parameters:

journal - The journal.

JournalMetadata

public JournalMetadata(AbstractJournal journal,
                       long commitTime)

Constructor variant used to indicate a read from a specific commitTime on a journal.

Parameters:

journal - The journal.

commitTime - The commitTime.

JournalMetadata

public JournalMetadata(File file,
                       UUID uuid,
                       long createTime,
                       long commitTime)

Data only constructor used by some unit tests.

Parameters:

file -

uuid -

createTime -

Method Detail

isIndexSegment

public final 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.

isJournal

public final 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.