com.arjuna.ats.internal.arjuna.objectstore

Class NullActionStore

java.lang.Object

com.arjuna.ats.arjuna.objectstore.ObjectStore

com.arjuna.ats.internal.arjuna.objectstore.FileSystemStore

com.arjuna.ats.internal.arjuna.objectstore.ShadowingStore

com.arjuna.ats.internal.arjuna.objectstore.ShadowNoFileLockStore

com.arjuna.ats.internal.arjuna.objectstore.NullActionStore

All Implemented Interfaces:

BaseStore, ObjectStoreAPI, ParticipantStore, RecoveryStore, TxLog

public class NullActionStore
extends ShadowNoFileLockStore

A null implementation. Useful for performance tuning.

Since:

JTS 1.0.

Version:

$Id: NullActionStore.java 2342 2006-03-30 13:06:17Z $

Author:

Mark Little (mark@arjuna.com)

Field Summary

Fields inherited from class com.arjuna.ats.internal.arjuna.objectstore.ShadowingStore

HIDDINGCHAR, SHADOWCHAR

Fields inherited from class com.arjuna.ats.internal.arjuna.objectstore.FileSystemStore

doSync, scanZeroLengthFiles, syncWrites

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

_objectStoreRoot, shareStatus

Constructor Summary

Constructors

Constructor and Description
NullActionStore(ObjectStoreEnvironmentBean objectStoreEnvironmentBean)

Method Summary

Modifier and Type	Method and Description
boolean	commit_state(Uid objUid, String tName) Commit a previous write_state operation which was made with the SHADOW StateType argument.
int	currentState(Uid objUid, String tName)
boolean	hide_state(Uid u, String tn) Hide/reveal an object regardless of state.
InputObjectState	read_committed(Uid storeUid, String tName) Read the object's committed state.
InputObjectState	read_uncommitted(Uid u, String tn) Read the object's shadowed state.
boolean	remove_committed(Uid storeUid, String tName) 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.
boolean	write_committed(Uid storeUid, String tName, OutputObjectState state) Write a new copy of the object's committed state.
boolean	write_uncommitted(Uid u, String tn, OutputObjectState s) Write a copy of the object's uncommitted state.

Methods inherited from class com.arjuna.ats.internal.arjuna.objectstore.ShadowNoFileLockStore

lock, unlock

Methods inherited from class com.arjuna.ats.internal.arjuna.objectstore.ShadowingStore

genPathName, read_state, remove_state, revealedId, write_state

Methods inherited from class com.arjuna.ats.internal.arjuna.objectstore.FileSystemStore

addToCache, allObjUids, allTypes, allTypes, closeAndUnlock, createHierarchy, exists, getStoreName, openAndLock, removeFromCache, removeFromCache, renameFromTo, supressEntry, synchronousWrites, truncate

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

allObjUids, fullCommitNeeded, initialise, isType, locateStore, 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 Detail

NullActionStore

public NullActionStore(ObjectStoreEnvironmentBean objectStoreEnvironmentBean)
                throws ObjectStoreException

Throws:

ObjectStoreException

Method Detail

currentState

public int currentState(Uid objUid,
                        String tName)
                 throws ObjectStoreException

Specified by:

currentState in interface RecoveryStore

Overrides:

currentState in class ShadowingStore

Parameters:

objUid - The object to query.

tName - The type of the object to query.

Returns:

current state of object. Assumes that genPathName allocates enough extra space to allow extra chars to be added. Action stores only store committed objects

Throws:

ObjectStoreException

commit_state

public boolean commit_state(Uid objUid,
                            String tName)
                     throws ObjectStoreException

Commit a previous write_state operation which was made with the SHADOW StateType argument. This is achieved by renaming the shadow and removing the hidden version.

Specified by:

commit_state in interface ParticipantStore

Overrides:

commit_state in class ShadowingStore

Parameters:

objUid - The object to work on.

tName - 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

Description copied from class: ShadowingStore

Hide/reveal an object regardless of state. Hidden objects cannot be read but they can be written (Crash recovery needs this).

Specified by:

hide_state in interface RecoveryStore

Overrides:

hide_state in class ShadowingStore

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

Description copied from interface: RecoveryStore

Reveal a hidden object's state.

Specified by:

reveal_state in interface RecoveryStore

Overrides:

reveal_state in class ShadowingStore

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 storeUid,
                                       String tName)
                                throws ObjectStoreException

Description copied from interface: ParticipantStore

Read the object's committed state.

Specified by:

read_committed in interface ParticipantStore

Specified by:

read_committed in interface RecoveryStore

Overrides:

read_committed in class FileSystemStore

Parameters:

storeUid - The object to work on.

tName - 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

Description copied from interface: ParticipantStore

Read the object's shadowed state.

Specified by:

read_uncommitted in interface ParticipantStore

Overrides:

read_uncommitted in class FileSystemStore

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 storeUid,
                                String tName)
                         throws ObjectStoreException

Description copied from interface: TxLog

Remove the object's committed state.

Specified by:

remove_committed in interface TxLog

Overrides:

remove_committed in class FileSystemStore

Parameters:

storeUid - The object to work on.

tName - 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

Description copied from interface: ParticipantStore

Remove the object's uncommitted state.

Specified by:

remove_uncommitted in interface ParticipantStore

Overrides:

remove_uncommitted in class FileSystemStore

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 storeUid,
                               String tName,
                               OutputObjectState state)
                        throws ObjectStoreException

Description copied from interface: TxLog

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

Specified by:

write_committed in interface TxLog

Overrides:

write_committed in class FileSystemStore

Parameters:

storeUid - The object to work on.

tName - The type of the object to work on.

state - 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 s)
                          throws ObjectStoreException

Description copied from interface: ParticipantStore

Write a copy of the object's uncommitted state.

Specified by:

write_uncommitted in interface ParticipantStore

Overrides:

write_uncommitted in class FileSystemStore

Parameters:

u - The object to work on.

tn - The type of the object to work on.

s - The state to write.

Returns:

true if no errors occurred, false otherwise.

Throws:

ObjectStoreException