Package com.microstrategy.utils.cache

Interface Cache

All Known Implementing Classes:

BaseGraphStylePropertiesCache, CacheBase, ConfigurationFilesCache, CustomizationsAwareCache, CustomResourceBundleCache, DataServerConnectionInfoCache, EmptySchemaSearchCache, FileCacheBase, MapBoxBoundaryCache, MapShapeCache, MSIRefreshClusterMembershipCache, NamedFolderIDCache, ProjectCacheBase, PropertiesCache, RandomNumberMap, RefineServerPortCache, RepositorySettingsCache, ResourceBundleCache, ResourceCache, ServerCacheBase, ServerDefBypassAclCache, ServerDefCache, SessionCacheBase, SysDimensionCache

public interface Cache

Cache interface. Cache is a collection of objects that are loaded from the persistent storage and cached in the memory.

Since:

MicroStrategy Web 7.3.1 or earlier

Method Summary

Modifier and Type	Method	Description
void	clear()	Clears the cache - all entries are removed.
void	close()	Un-register cache from the cache registry.
boolean	contains(CacheHint hint)
void	delete(CacheHint hint)	Removes object from the cache and persistent storage
java.lang.Object	get(CacheHint hint)	Finds and returns cached object based on the hint.
java.lang.String	getName()	Returns cache name.
void	onHintClose(CacheHint hint)	This method is supposed to be called by the hint object when it is closed.
void	put(CacheHint hint, java.lang.Object ob)	Puts the object in the cache.
java.lang.Object	refresh(CacheHint hint)	Re-loads object from the persistent storage
void	remove(CacheHint hint)	Removes an object from the cache.
void	save(CacheHint hint, java.lang.Object ob)	Puts the object in the cache and stores it in the memory.

Method Detail

getName

java.lang.String getName()

Returns cache name.

Returns:

cache name.

get

java.lang.Object get(CacheHint hint)
              throws CacheException

Finds and returns cached object based on the hint. If object does not exists in the memory it will be loaded from the persistent memory. Returns null if object does not exists in persistent memory either.

Parameters:

hint - the hint object.

Returns:

cached object.

Throws:

CacheException - if attempt to load object from the persistent memory faild with exception

put

void put(CacheHint hint,
         java.lang.Object ob)
  throws CacheException

Puts the object in the cache. If cache already contains object corresponding to the specified hint it will be replaced with the new one.

Parameters:

hint - the hint object.

ob - object to be cached

Throws:

CacheException - if attempt to extract key from the hint failed

remove

void remove(CacheHint hint)
     throws CacheException

Removes an object from the cache.

Parameters:

hint - the hint object.

Throws:

CacheException - Thrown when error occurs during removing the object.

save

void save(CacheHint hint,
          java.lang.Object ob)
   throws CacheException

Puts the object in the cache and stores it in the memory. Normally this method will be called after application obtained an object from the cache and modified it. But it is also possible to use this method to replace cached object with another one or to add to the cache and to the persistent storage a new object.

Parameters:

hint - the hint object.

ob - object to be cached

Throws:

CacheException - if attempt to extract key from the hint failed or if attempt to store obect in the persistent storage failed

delete

void delete(CacheHint hint)
     throws CacheException

Removes object from the cache and persistent storage

Parameters:

hint - the hint object.

Throws:

CacheException - if attempt to extract key from the hint failed or if attempt to remove obect from the persistent storage failed

refresh

java.lang.Object refresh(CacheHint hint)
                  throws CacheException

Re-loads object from the persistent storage

Parameters:

hint - the hint object.

Returns:

cached object. Different cache implementations can either re-load data in the existing object or create a new one.

Throws:

CacheException - if attempt to extract key from the hint failed or if attempt to re-load obect from the persistent storage failed

close

void close()

Un-register cache from the cache registry. Cache shall not be used after this call.

Since:

MicroStrategy Web 8.0.0

onHintClose

void onHintClose(CacheHint hint)

This method is supposed to be called by the hint object when it is closed. Cache implementations shall use this call to perform proper cache cleanup.

Parameters:

hint - the hint object.

clear

void clear()

Clears the cache - all entries are removed.

Since:

MicroStrategy Web 7.5.1

contains

boolean contains(CacheHint hint)
          throws CacheException

Throws:

CacheException