org.apache.jackrabbit.core.persistence.mem

Class InMemBundlePersistenceManager

java.lang.Object

org.apache.jackrabbit.core.persistence.bundle.AbstractBundlePersistenceManager

org.apache.jackrabbit.core.persistence.mem.InMemBundlePersistenceManager

All Implemented Interfaces:

CacheAccessListener, CachingPersistenceManager, ConsistencyChecker, IterablePersistenceManager, PersistenceManager

public class InMemBundlePersistenceManager
extends AbstractBundlePersistenceManager

BundleInMemPersistenceManager is a HashMap-based PersistenceManager for Jackrabbit that keeps all data in memory and that is capable of storing and loading its contents using a simple custom binary serialization format (see Serializer).

It is configured through the following properties:

• initialCapacity: initial capacity of the hash map used to store the data
• loadFactor: load factor of the hash map used to store the data
• persistent: if true the contents of the hash map is loaded on startup and stored on shutdown; if false nothing is persisted
• useFileBlobStore: if true the contents of the blobs will be directly stored on the file system instead of in memory.
• minBlobSize use blob store for binaries properties larger than minBlobSite (bytes). Default is 4096.

Please note that this class should only be used for testing purposes.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static interface	InMemBundlePersistenceManager.CloseableBLOBStore Helper interface for closeable stores
protected class	InMemBundlePersistenceManager.InMemBLOBStore Trivial BLOBStore implementation that is backed by a HashMap.

Field Summary

Fields

Modifier and Type	Field and Description
protected BundleBinding	binding the bundle binding
protected FileSystem	blobFS File system where BLOB data is stored.
protected static String	BLOBS_FILE_PATH Path where blobs are stored on shutdown.
protected BLOBStore	blobStore Blob store.
protected static String	BUNDLE_FILE_PATH Path where bundles are stored on shutdown.
protected Map<NodeId,byte[]>	bundleStore Bundle memory store.
protected ErrorHandling	errorHandling Flag for error handling.
protected static int	INITIAL_BUFFER_SIZE Initial size of buffer used to serialize objects.
protected int	initialCapacity initial capacity
protected boolean	initialized flag indicating if this manager was initialized
protected float	loadFactor load factor for the hash map
protected boolean	persistent Should hash map be persisted?
protected static String	REFS_FILE_PATH Path where references are stored on shutdown.
protected Map<NodeId,byte[]>	refsStore References memory store.
protected boolean	useFileBlobStore Store blobs on file system instead of memory.
protected FileSystem	wspFS File system where the content of the hash maps are read from/written to (if persistent==true)

Fields inherited from class org.apache.jackrabbit.core.persistence.bundle.AbstractBundlePersistenceManager

context, NODEFILENAME, NODEREFSFILENAME, RES_NAME_INDEX, RES_NS_INDEX

Fields inherited from interface org.apache.jackrabbit.core.cache.CacheAccessListener

ACCESS_INTERVAL

Constructor Summary

Constructors

Constructor and Description
InMemBundlePersistenceManager() Creates a new InMemBundlePersistenceManager instance.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Closes the persistence manager.
protected void	destroy(NodeReferences refs) Deletes the node references from the underlying system.
protected void	destroyBundle(NodePropBundle bundle) Deletes the bundle from the underlying system.
boolean	existsReferencesTo(NodeId targetId) Checks whether references of the identified target node exist.
List<NodeId>	getAllNodeIds(NodeId after, int maxCount) Get all node ids.
protected BLOBStore	getBlobStore() Returns the BLOB store used by this persistence manager.
String	getInitialCapacity()
String	getLoadFactor()
String	getMinBlobSize()
void	init(PMContext context) Initializes the persistence manager.
boolean	isPersistent()
protected NodePropBundle	loadBundle(NodeId id) Loads a bundle from the underlying system.
void	loadContents() Reads the content of the hash maps from the file system
NodeReferences	loadReferencesTo(NodeId id) Load the persisted references to the node with the given identifier.
void	setInitialCapacity(int initialCapacity)
void	setInitialCapacity(String initialCapacity)
void	setLoadFactor(float loadFactor)
void	setLoadFactor(String loadFactor)
void	setMinBlobSize(String minBlobSize)
void	setPersistent(boolean persistent)
void	setPersistent(String persistent)
void	setUseFileBlobStore(boolean useFileBlobStore)
void	setUseFileBlobStore(String useFileBlobStore)
protected void	store(NodeReferences refs) Stores a node references to the underlying system.
protected void	storeBundle(NodePropBundle bundle) Stores a bundle to the underlying system.
void	storeContents() Writes the content of the hash maps stores to the file system.

Methods inherited from class org.apache.jackrabbit.core.persistence.bundle.AbstractBundlePersistenceManager

buildBlobFilePath, buildNodeFilePath, buildNodeFolderPath, buildNodeReferencesFilePath, buildPropFilePath, cacheAccessed, check, checkConsistency, createNew, createNew, disposeCache, evictBundle, exists, exists, getAllNodeInfos, getBundleCacheSize, getNameIndex, getNsIndex, load, load, onExternalUpdate, setBundleCacheSize, setEventChannel, store

Methods inherited from class java.lang.Object

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

Field Detail

initialized

protected boolean initialized

flag indicating if this manager was initialized

BUNDLE_FILE_PATH

protected static final String BUNDLE_FILE_PATH

Path where bundles are stored on shutdown. (if persistent==true)

See Also:

Constant Field Values

BLOBS_FILE_PATH

protected static final String BLOBS_FILE_PATH

Path where blobs are stored on shutdown. (if persistent==true and useFileBlobStore==false)

See Also:

Constant Field Values

REFS_FILE_PATH

protected static final String REFS_FILE_PATH

Path where references are stored on shutdown. (if persistent==true)

See Also:

Constant Field Values

wspFS

protected FileSystem wspFS

File system where the content of the hash maps are read from/written to (if persistent==true)

blobFS

protected FileSystem blobFS

File system where BLOB data is stored. (if useFileBlobStore==true)

INITIAL_BUFFER_SIZE

protected static final int INITIAL_BUFFER_SIZE

Initial size of buffer used to serialize objects.

See Also:

Constant Field Values

errorHandling

protected ErrorHandling errorHandling

Flag for error handling.

binding

protected BundleBinding binding

the bundle binding

bundleStore

protected Map<NodeId,byte[]> bundleStore

Bundle memory store.

refsStore

protected Map<NodeId,byte[]> refsStore

References memory store.

blobStore

protected BLOBStore blobStore

Blob store.

initialCapacity

protected int initialCapacity

initial capacity

loadFactor

protected float loadFactor

load factor for the hash map

persistent

protected boolean persistent

Should hash map be persisted?

useFileBlobStore

protected boolean useFileBlobStore

Store blobs on file system instead of memory.

Constructor Detail

InMemBundlePersistenceManager

public InMemBundlePersistenceManager()

Creates a new InMemBundlePersistenceManager instance.

Method Detail

setInitialCapacity

public void setInitialCapacity(int initialCapacity)

setInitialCapacity

public void setInitialCapacity(String initialCapacity)

getInitialCapacity

public String getInitialCapacity()

setLoadFactor

public void setLoadFactor(float loadFactor)

setLoadFactor

public void setLoadFactor(String loadFactor)

getLoadFactor

public String getLoadFactor()

isPersistent

public boolean isPersistent()

setPersistent

public void setPersistent(boolean persistent)

setPersistent

public void setPersistent(String persistent)

setUseFileBlobStore

public void setUseFileBlobStore(boolean useFileBlobStore)

setUseFileBlobStore

public void setUseFileBlobStore(String useFileBlobStore)

getMinBlobSize

public String getMinBlobSize()

setMinBlobSize

public void setMinBlobSize(String minBlobSize)

loadContents

public void loadContents()
                  throws Exception

Reads the content of the hash maps from the file system

Throws:

Exception - if an error occurs

storeContents

public void storeContents()
                   throws Exception

Writes the content of the hash maps stores to the file system.

Throws:

Exception - if an error occurs

init

public void init(PMContext context)
          throws Exception

Initializes the persistence manager. The persistence manager is permanently bound to the given context, and any required external resources are acquired.

An appropriate exception is thrown if the persistence manager initialization fails for whatever reason. In this case the state of the persistence manager is undefined and the instance should be discarded. Initializes the internal structures of this abstract persistence manager.

Specified by:

init in interface PersistenceManager

Overrides:

init in class AbstractBundlePersistenceManager

Parameters:

context - persistence manager context

Throws:

Exception - if the persistence manager initialization failed

close

public void close()
           throws Exception

Closes the persistence manager. The consistency of the persistent storage is guaranteed and all acquired resources are released. It is an error to invoke any methods on a closed persistence manager, and implementations are free to enforce this constraint by throwing IllegalStateExceptions in such cases.

An appropriate exception is thrown if the persistence manager could not be closed properly. In this case the state of the persistence manager is undefined and the instance should be discarded. Closes the persistence manager, release acquired resources.

Specified by:

close in interface PersistenceManager

Overrides:

close in class AbstractBundlePersistenceManager

Throws:

Exception - if the persistence manager failed to close properly

loadReferencesTo

public NodeReferences loadReferencesTo(NodeId id)
                                throws NoSuchItemStateException,
                                       ItemStateException

Load the persisted references to the node with the given identifier.

Parameters:

id - reference target node id

Throws:

NoSuchItemStateException - if the target node does not exist

ItemStateException - if another error occurs

store

protected void store(NodeReferences refs)
              throws ItemStateException

Stores a node references to the underlying system.

Specified by:

store in class AbstractBundlePersistenceManager

Parameters:

refs - the node references to store.

Throws:

ItemStateException - if an error while storing occurs.

existsReferencesTo

public boolean existsReferencesTo(NodeId targetId)
                           throws ItemStateException

Checks whether references of the identified target node exist.

Parameters:

targetId - target node id

Returns:

true if the references exist, false otherwise

Throws:

ItemStateException - on persistence manager errors

destroy

protected void destroy(NodeReferences refs)
                throws ItemStateException

Deletes the node references from the underlying system.

Specified by:

destroy in class AbstractBundlePersistenceManager

Parameters:

refs - the node references to destroy.

Throws:

ItemStateException - if an error while destroying occurs.

getAllNodeIds

public List<NodeId> getAllNodeIds(NodeId after,
                         int maxCount)
                           throws ItemStateException,
                                  javax.jcr.RepositoryException

Get all node ids. A typical application will call this method multiple times, where 'after' is the last row read previously. The maxCount parameter defines the maximum number of node ids returned, 0 meaning no limit. The order of the node ids is specific for the given persistent manager. Items that are added concurrently may not be included.

Parameters:

after - the lower limit, or null for no limit.

maxCount - the maximum number of node ids to return, or 0 for no limit.

Returns:

a list of all node ids.

Throws:

ItemStateException - if an error while loading occurs.

javax.jcr.RepositoryException - if a repository exception occurs.

loadBundle

protected NodePropBundle loadBundle(NodeId id)
                             throws ItemStateException

Loads a bundle from the underlying system.

Specified by:

loadBundle in class AbstractBundlePersistenceManager

Parameters:

id - the node id of the bundle

Returns:

the loaded bundle or null if the bundle does not exist.

Throws:

ItemStateException - if an error while loading occurs.

storeBundle

protected void storeBundle(NodePropBundle bundle)
                    throws ItemStateException

Stores a bundle to the underlying system.

Specified by:

storeBundle in class AbstractBundlePersistenceManager

Parameters:

bundle - the bundle to store

Throws:

ItemStateException - if an error while storing occurs.

destroyBundle

protected void destroyBundle(NodePropBundle bundle)
                      throws ItemStateException

Deletes the bundle from the underlying system.

Specified by:

destroyBundle in class AbstractBundlePersistenceManager

Parameters:

bundle - the bundle to destroy

Throws:

ItemStateException - if an error while destroying occurs.

getBlobStore

protected BLOBStore getBlobStore()

Returns the BLOB store used by this persistence manager.

Specified by:

getBlobStore in class AbstractBundlePersistenceManager

Returns:

BLOB store