com.hp.hpl.jena.tdb
Class StoreConnection

java.lang.Object
  com.hp.hpl.jena.tdb.StoreConnection

public class StoreConnection
extends Object

A StoreConnection is the reference to the underlying storage. There is JVM-wide cache of backing datasets. The work of transaction coordination is done in TransactionManager.

Method Summary

boolean	activeTransactions() Indicate whether there are any active transactions.
com.hp.hpl.jena.tdb.transaction.DatasetGraphTxn	begin(ReadWrite mode) Begin a transaction.
com.hp.hpl.jena.tdb.transaction.DatasetGraphTxn	begin(ReadWrite mode, String label) Begin a transaction, giving it a label.
static StoreConnection	createMemUncached() Return a StoreConnection backed by in-memory datastructures (for testing).
static void	expel(com.hp.hpl.jena.tdb.base.file.Location location, boolean force) Stop managing a location.
void	flush() Flush the delayed write queue to the base storage.
void	forceRecoverFromJournal() Flush the journal regardless - use with great case - do not use when transactions may be active.
com.hp.hpl.jena.tdb.store.DatasetGraphTDB	getBaseDataset() Testing operation - do not use the base dataset without knowing how the transaction system uses it.
static StoreConnection	getExisting(com.hp.hpl.jena.tdb.base.file.Location location) Return the StoreConnection if one already exists for this location, else return null
com.hp.hpl.jena.tdb.base.file.Location	getLocation()
com.hp.hpl.jena.tdb.transaction.SysTxnState	getTransMgrState() Return a description of the transaction manager state
boolean	haveUsedInTransaction()
static StoreConnection	make(com.hp.hpl.jena.tdb.base.file.Location location) Return a StoreConnection for a particular connection.
static StoreConnection	make(String location) Obtain a StoreConenction for a particular location
void	printJournal() Highly risky!
static void	release(com.hp.hpl.jena.tdb.base.file.Location location) Stop managing a location.
static void	reset() Stop managing all locations.

Methods inherited from class java.lang.Object

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

Method Detail

haveUsedInTransaction

public boolean haveUsedInTransaction()

getLocation

public com.hp.hpl.jena.tdb.base.file.Location getLocation()

getTransMgrState

public com.hp.hpl.jena.tdb.transaction.SysTxnState getTransMgrState()

Return a description of the transaction manager state

begin

public com.hp.hpl.jena.tdb.transaction.DatasetGraphTxn begin(ReadWrite mode)

Begin a transaction. Terminate a write transaction with Transaction.commit() or Transaction.abort(). Terminate a write transaction with Transaction.close().

begin

public com.hp.hpl.jena.tdb.transaction.DatasetGraphTxn begin(ReadWrite mode,
                                                             String label)

Begin a transaction, giving it a label. Terminate a write transaction with Transaction.commit() or Transaction.abort(). Terminate a write transaction with Transaction.close().

getBaseDataset

public com.hp.hpl.jena.tdb.store.DatasetGraphTDB getBaseDataset()

Testing operation - do not use the base dataset without knowing how the transaction system uses it. The base dataset may not reflect the true state if pending commits are queued.

See Also:

flush()

flush

public void flush()

Flush the delayed write queue to the base storage. This can only be done if there are no active transactions. If there are active transactions, nothing is done but this is safe to call.

activeTransactions

public boolean activeTransactions()

Indicate whether there are any active transactions.

See Also:

getTransMgrState()

forceRecoverFromJournal

public void forceRecoverFromJournal()

Flush the journal regardless - use with great case - do not use when transactions may be active.

printJournal

public void printJournal()

Highly risky!

make

public static StoreConnection make(String location)

Obtain a StoreConenction for a particular location

reset

public static void reset()

Stop managing all locations. Use with great care.

release

public static void release(com.hp.hpl.jena.tdb.base.file.Location location)

Stop managing a location. There should be no transactions running.

expel

public static void expel(com.hp.hpl.jena.tdb.base.file.Location location,
                         boolean force)

Stop managing a location. Use with great care (testing only).

make

public static StoreConnection make(com.hp.hpl.jena.tdb.base.file.Location location)

Return a StoreConnection for a particular connection. This is used to create transactions for the database at the location.

getExisting

public static StoreConnection getExisting(com.hp.hpl.jena.tdb.base.file.Location location)

Return the StoreConnection if one already exists for this location, else return null

createMemUncached

public static StoreConnection createMemUncached()

Return a StoreConnection backed by in-memory datastructures (for testing).