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Class vnet.yawb.YAWBBackendManager 

java.lang.Object
   |
   +----vnet.yawb.YAWBBackendManager
public class YAWBBackendManager
extends Object
Maintains a cache of backends and performs data retrievals.

Variable Index

o BACKEND_CLASS
o BACKEND_ID
o backends
Available backends.
o CACHE_MAX_SIZE
o DEFAULT_MAX_CACHE_SIZE
o maxCache
Backend connection max cache size.

Constructor Index

o YAWBBackendManager(Properties)
Constructs a new YAWBBackendManager.

Method Index

o getConnection(YAWBBackendManager. BackendStore)
Returns a spare connection.
o getDataStore(YAWBStoreElement)
Retrieves a data store based on a YAWBStoreElement.
o returnConnection(YAWBBackendConnection)
Returns a connection the cache.

Variables

o backends 
 protected Hashtable backends
Available backends.

o maxCache 
 protected int maxCache
Backend connection max cache size.

o BACKEND_CLASS 
 public static final String BACKEND_CLASS
o BACKEND_ID 
 public static final String BACKEND_ID
o CACHE_MAX_SIZE 
 public static final String CACHE_MAX_SIZE
o DEFAULT_MAX_CACHE_SIZE 
 public static final int DEFAULT_MAX_CACHE_SIZE

Constructors

o YAWBBackendManager 
 public YAWBBackendManager(Properties conf) throws YAWBException, NullPointerException
Constructs a new YAWBBackendManager.

Parameters:
conf - non-null backend properties.
Throws: YAWBException
if a configurationerror occurs
Throws: NullPointerException
if conf is null

Methods

o getDataStore 
 public YAWBDataStore getDataStore(YAWBStoreElement source) throws YAWBException
Retrieves a data store based on a YAWBStoreElement.

Parameters:
source - a source element, may not be null
Returns:
a data store
Throws: YAWBException
if a YAWB error occured
o returnConnection 
 protected void returnConnection(YAWBBackendConnection conn)
Returns a connection the cache. This should be called after a connection and and YAWBDataStores that originated from it have been finished with.

Parameters:
conn - the no-longer-required connection to be added back to the cache
o getConnection 
 protected YAWBBackendConnection getConnection(YAWBBackendManager. BackendStore store) throws YAWBException
Returns a spare connection.

Throws: YAWBException
if a YAWB error occured 
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