wt.pom
Class EmptyTableManager

java.lang.Object
  java.rmi.server.RemoteObject
      java.rmi.server.RemoteServer
          wt.util.RMIServer
              wt.cache.CacheManager
                  wt.pom.EmptyTableManager

All Implemented Interfaces:

CacheServer, Remote, Serializable, Unreferenced

Direct Known Subclasses:

NoOpEmptyTableManager

public class EmptyTableManager

extends CacheManager

Provides methods to access cached empty tables information.

Supported API: false

Extendable: false

See Also:

Serialized Form

Nested Class Summary

(package private) class	EmptyTableManager.AllManagersStartedEventListener
(package private) class	EmptyTableManager.EmptyTablePOMOperationListener

Field Summary

private Hashtable	cache
private static String	CLASSNAME
private HashMap	foreignKeyMap
private static Object	IS_STALE
(package private) boolean	isPopulated
private static Object	lock
private static EmptyTableManager	manager
(package private) boolean	opEnabled
private static String	RESOURCE

Fields inherited from class wt.cache.CacheManager

MASTER

Fields inherited from class wt.util.RMIServer

csf, ssf

Fields inherited from class java.rmi.server.RemoteServer

Fields inherited from class java.rmi.server.RemoteObject

ref

Fields inherited from interface wt.cache.CacheServer

versionID

Constructor Summary

EmptyTableManager()


Supported API: false

Method Summary

private void	clearStaleFlag() Clears a boolean flag in the MethodContext that indicates that the cache contains stale data for the current transaction
static void	disable()
ClassInfo[]	filterEmptyTables(ClassInfo[] a_classInfos)
Vector	filterEmptyTables(Vector a_classInfos)
private void	findEmptyTables(Vector classNames)
private void	findNotEmptyTables(Vector classNames)
private Hashtable	getCache()
int	getDefaultSize() override CacheManager.getDefaultSize to return 0 since no objects will be put into the wt.util.Cache object contained in CacheManager.
static EmptyTableManager	getEmptyTableManager() an assessor method to obtain the single instance of the EmptyTableManager.
private void	initializeForeignKeyMap()
private void	initializeForeignKeyMapFor(Class a_class)
boolean	isStale() Indicates if the contents of cache have been changed at some point.
boolean	isTableEmpty(ClassInfo a_classInfo)
boolean	isTableEmpty(Object a_className) method to tell if a class table is empty given class name in the form of String.
private void	populateCache()
void	putEntry(Object key, Object value) override CacheManager.putEntry to do nothing so that entries are not added to the wt.util.Cache object contained in CacheManager.
private QueryResult	queryTables(Vector classNames)
private void	registerAllManagersStartedEventListener()
private void	registerPOMOperationListener()
void	removeClassName(Object a_className) called by StandardPersistentManager to remove an entry from the cache when the insert operation is done.
protected void	removeEntry(Object key) override CacheManager.removeEntry to receiving the notifying classname and remove this entry from the cache.
void	reset() Reset local cache after master reconnect.
private void	setStaleFlag() Sets a boolean flag in the MethodContext that indicates that the cache contains stale data for the current transaction
private static void	signalRemoteCaches(Object a_className) method for internal use by the method void removeClassName(Object a_className) to notify other remote caches for removing an entry given the class name.

Methods inherited from class wt.cache.CacheManager

checkAccess, get, getDefaultName, getEntry, isCacheHost, overflow, ping, put, putEntry, reference, registerSlave, remove, remove, removeEntry, unreferenced, update, updateEntry, updateEntry

Methods inherited from class wt.util.RMIServer

clone, exportObject, exportObject, exportObject, getClientSocketFactory, getPort, getServerSocketFactory, getStub, isHostInList, isLocalHost, setPort, writeReplace

Methods inherited from class java.rmi.server.RemoteServer

getClientHost, getLog, setLog

Methods inherited from class java.rmi.server.RemoteObject

equals, getRef, hashCode, toString, toStub

Methods inherited from class java.lang.Object

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

Field Detail

RESOURCE

private static final String RESOURCE

See Also:

Constant Field Values

CLASSNAME

private static final String CLASSNAME

cache

private Hashtable cache

foreignKeyMap

private HashMap foreignKeyMap

isPopulated

boolean isPopulated

opEnabled

boolean opEnabled

manager

private static EmptyTableManager manager

lock

private static Object lock

IS_STALE

private static final Object IS_STALE

Constructor Detail

EmptyTableManager

public EmptyTableManager()
                  throws RemoteException

Supported API: false

Method Detail

getCache

private Hashtable getCache()

populateCache

private void populateCache()
                    throws WTException

Throws:

WTException

initializeForeignKeyMap

private void initializeForeignKeyMap()
                              throws WTException

Throws:

WTException

getDefaultSize

public int getDefaultSize()

override CacheManager.getDefaultSize to return 0 since no objects will be put into the wt.util.Cache object contained in CacheManager.

Supported API: false

Overrides:

getDefaultSize in class CacheManager

Returns:

int

putEntry

public void putEntry(Object key,
                     Object value)

override CacheManager.putEntry to do nothing so that entries are not added to the wt.util.Cache object contained in CacheManager.

Supported API: false

Overrides:

putEntry in class CacheManager

Parameters:

key -

value -

removeEntry

protected void removeEntry(Object key)

override CacheManager.removeEntry to receiving the notifying classname and remove this entry from the cache.

Supported API: false

Overrides:

removeEntry in class CacheManager

Parameters:

key -

isStale

public boolean isStale()

Indicates if the contents of cache have been changed at some point.

Returns:

true if this cache has already been updated in the current transaction, otherwise false

setStaleFlag

private void setStaleFlag()

Sets a boolean flag in the MethodContext that indicates that the cache contains stale data for the current transaction

clearStaleFlag

private void clearStaleFlag()

Clears a boolean flag in the MethodContext that indicates that the cache contains stale data for the current transaction

signalRemoteCaches

private static void signalRemoteCaches(Object a_className)

method for internal use by the method void removeClassName(Object a_className) to notify other remote caches for removing an entry given the class name.

Parameters:

a_className -

isTableEmpty

public boolean isTableEmpty(Object a_className)

method to tell if a class table is empty given class name in the form of String.

Supported API: false

Parameters:

a_className -

Returns:

boolean

isTableEmpty

public boolean isTableEmpty(ClassInfo a_classInfo)

filterEmptyTables

public ClassInfo[] filterEmptyTables(ClassInfo[] a_classInfos)

filterEmptyTables

public Vector filterEmptyTables(Vector a_classInfos)

removeClassName

public void removeClassName(Object a_className)

called by StandardPersistentManager to remove an entry from the cache when the insert operation is done.

Supported API: false

Parameters:

a_className -

disable

public static void disable()
                    throws WTException

Throws:

WTException

getEmptyTableManager

public static EmptyTableManager getEmptyTableManager()
                                              throws WTException

an assessor method to obtain the single instance of the EmptyTableManager.

Supported API: false

Returns:

EmptyTablemanager

Throws:

WTException

reset

public void reset()
           throws RemoteException

Description copied from class: CacheManager

Reset local cache after master reconnect. Called after recovery from communication failure when a connection to a new master has been established. The current cache contents are cleared and the local cache is registered as a slave of the new master.

NOTE: This may be called as a result of calling other cache updating operations since that is when the disconnect and reconnect may take place. When this happens, this method is called before the other methods return.

Supported API: true

Overrides:

reset in class CacheManager

Throws:

RemoteException

queryTables

private QueryResult queryTables(Vector classNames)
                         throws PersistenceException

Throws:

PersistenceException

findEmptyTables

private void findEmptyTables(Vector classNames)
                      throws PersistenceException

Throws:

PersistenceException

findNotEmptyTables

private void findNotEmptyTables(Vector classNames)
                         throws PersistenceException

Throws:

PersistenceException

initializeForeignKeyMapFor

private void initializeForeignKeyMapFor(Class a_class)
                                 throws WTException

Throws:

WTException

registerAllManagersStartedEventListener

private void registerAllManagersStartedEventListener()

registerPOMOperationListener

private void registerPOMOperationListener()
                                   throws WTException

Throws:

WTException