Package com.arjuna.ats.internal.arjuna.objectstore

Class VolatileStore

java.lang.Object

com.arjuna.ats.arjuna.objectstore.ObjectStore

com.arjuna.ats.internal.arjuna.objectstore.VolatileStore

All Implemented Interfaces:

BaseStore, ObjectStoreAPI, ParticipantStore, RecoveryStore, TxLog

public class VolatileStore
extends ObjectStore

An in-memory ObjectStore that never writes to stable storage. Useless for most production apps, but handy for some performance testing cases. Does not support crash recovery methods as there is no stable state to recover.

Author:

Jonathan Halliday (jonathan.halliday@redhat.com), 2008-10

Field Summary

Fields inherited from class com.arjuna.ats.arjuna.objectstore.ObjectStore

_objectStoreRoot, shareStatus

Constructor Summary

Constructors

Constructor	Description
VolatileStore(ObjectStoreEnvironmentBean objectStoreEnvironmentBean)

Method Summary

Modifier and Type	Method	Description
boolean	allObjUids(String s, InputObjectState buff, int m)	Obtain all of the Uids for a specified type.
boolean	allTypes(InputObjectState buff)	Obtain all types of objects stored in the object store.
boolean	commit_state(Uid u, String tn)	Commit the object's state in the object store.
int	currentState(Uid u, String tn)
String	getStoreName()
boolean	hide_state(Uid u, String tn)	Hide the object's state in the object store.
InputObjectState	read_committed(Uid u, String tn)	Read the object's committed state.
InputObjectState	read_uncommitted(Uid u, String tn)	Read the object's shadowed state.
boolean	remove_committed(Uid u, String tn)	Remove the object's committed state.
boolean	remove_uncommitted(Uid u, String tn)	Remove the object's uncommitted state.
boolean	reveal_state(Uid u, String tn)	Reveal a hidden object's state.
protected boolean	supressEntry(String name)	Suppress directories of the specified type from allTypes etc?
boolean	write_committed(Uid u, String tn, OutputObjectState buff)	Write a new copy of the object's committed state.
boolean	write_uncommitted(Uid u, String tn, OutputObjectState buff)	Write a copy of the object's uncommitted state.

Methods inherited from class com.arjuna.ats.arjuna.objectstore.ObjectStore

allObjUids, fullCommitNeeded, initialise, isType, locateStore, revealedId, shareState, start, stop, storeDir, storeRoot, sync

Methods inherited from class java.lang.Object

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

Constructor Details

VolatileStore

public VolatileStore(ObjectStoreEnvironmentBean objectStoreEnvironmentBean)
              throws ObjectStoreException

Throws:

ObjectStoreException

Method Details

allObjUids

public boolean allObjUids(String s,
 InputObjectState buff,
 int m)
                   throws ObjectStoreException

Obtain all of the Uids for a specified type.

Parameters:

s - The type to scan for.

buff - The object state in which to store the Uids

m - The file type to look for (e.g., committed, shadowed).

Returns:

true if no errors occurred, false otherwise.

Throws:

ObjectStoreException

allTypes

public boolean allTypes(InputObjectState buff)
                 throws ObjectStoreException

Obtain all types of objects stored in the object store.

Parameters:

buff - The state in which to store the types.

Returns:

true if no errors occurred, false otherwise.

Throws:

ObjectStoreException

currentState

public int currentState(Uid u,
 String tn)
                 throws ObjectStoreException

Parameters:

u - The object to query.

tn - The type of the object to query.

Returns:

the current state of the object's state (e.g., shadowed, committed ...)

Throws:

ObjectStoreException

getStoreName

public String getStoreName()

Returns:

the name of the object store.

commit_state

public boolean commit_state(Uid u,
 String tn)
                     throws ObjectStoreException

Commit the object's state in the object store.

Parameters:

u - The object to work on.

tn - The type of the object to work on.

Returns:

true if no errors occurred, false otherwise.

Throws:

ObjectStoreException

hide_state

public boolean hide_state(Uid u,
 String tn)
                   throws ObjectStoreException

Hide the object's state in the object store. Used by crash recovery.

Parameters:

u - The object to work on.

tn - The type of the object to work on.

Returns:

true if no errors occurred, false otherwise.

Throws:

ObjectStoreException

reveal_state

public boolean reveal_state(Uid u,
 String tn)
                     throws ObjectStoreException

Reveal a hidden object's state.

Parameters:

u - The object to work on.

tn - The type of the object to work on.

Returns:

true if no errors occurred, false otherwise.

Throws:

ObjectStoreException

read_committed

public InputObjectState read_committed(Uid u,
 String tn)
                                throws ObjectStoreException

Read the object's committed state.

Parameters:

u - The object to work on.

tn - The type of the object to work on.

Returns:

the state of the object.

Throws:

ObjectStoreException

read_uncommitted

public InputObjectState read_uncommitted(Uid u,
 String tn)
                                  throws ObjectStoreException

Read the object's shadowed state.

Parameters:

u - The object to work on.

tn - The type of the object to work on.

Returns:

the state of the object.

Throws:

ObjectStoreException

remove_committed

public boolean remove_committed(Uid u,
 String tn)
                         throws ObjectStoreException

Remove the object's committed state.

Parameters:

u - The object to work on.

tn - The type of the object to work on.

Returns:

true if no errors occurred, false otherwise.

Throws:

ObjectStoreException

remove_uncommitted

public boolean remove_uncommitted(Uid u,
 String tn)
                           throws ObjectStoreException

Remove the object's uncommitted state.

Parameters:

u - The object to work on.

tn - The type of the object to work on.

Returns:

true if no errors occurred, false otherwise.

Throws:

ObjectStoreException

write_committed

public boolean write_committed(Uid u,
 String tn,
 OutputObjectState buff)
                        throws ObjectStoreException

Write a new copy of the object's committed state.

Parameters:

u - The object to work on.

tn - The type of the object to work on.

buff - The state to write.

Returns:

true if no errors occurred, false otherwise.

Throws:

ObjectStoreException

write_uncommitted

public boolean write_uncommitted(Uid u,
 String tn,
 OutputObjectState buff)
                          throws ObjectStoreException

Write a copy of the object's uncommitted state.

Parameters:

u - The object to work on.

tn - The type of the object to work on.

buff - The state to write.

Returns:

true if no errors occurred, false otherwise.

Throws:

ObjectStoreException

supressEntry

protected boolean supressEntry(String name)

Suppress directories of the specified type from allTypes etc?

Specified by:

supressEntry in class ObjectStore