Package org.apache.jena.tdb

Class StoreConnection

  • public class StoreConnection
extends java.lang.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

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean activeTransactions()
      Indicate whether there are any active transactions.
      org.apache.jena.tdb.transaction.DatasetGraphTxn begin​(TxnType mode)
      Begin a transaction.
      org.apache.jena.tdb.transaction.DatasetGraphTxn begin​(TxnType mode, java.lang.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​(org.apache.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.
      org.apache.jena.tdb.store.DatasetGraphTDB getBaseDataset()
      Internal operation - to get a dataset for application use, call a TDBFactory function.
      static StoreConnection getExisting​(org.apache.jena.tdb.base.file.Location location)
      Return the StoreConnection if one already exists for this location, else return null
      org.apache.jena.tdb.base.file.Location getLocation()  
      org.apache.jena.tdb.transaction.TransactionManager getTransactionManager()
      For internal use only
      org.apache.jena.tdb.transaction.SysTxnState getTransMgrState()
      Return a description of the transaction manager state
      boolean haveUsedInTransaction()  
      boolean isValid()  
      static StoreConnection make​(java.lang.String location)
      Obtain a StoreConnection for a particular location
      static StoreConnection make​(org.apache.jena.tdb.base.file.Location location)
      Make a StoreConnection based on any StoreParams at the location or the system defaults.
      static StoreConnection make​(org.apache.jena.tdb.base.file.Location location, org.apache.jena.tdb.setup.StoreParams params)
      Return a StoreConnection for a particular connection.
      void printJournal()
      Highly risky!
      static void release​(org.apache.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

      • isValid

        public boolean isValid()

      • haveUsedInTransaction

        public boolean haveUsedInTransaction()

      • getLocation

        public org.apache.jena.tdb.base.file.Location getLocation()

      • getTransMgrState

        public org.apache.jena.tdb.transaction.SysTxnState getTransMgrState()
        Return a description of the transaction manager state

      • begin

        public org.apache.jena.tdb.transaction.DatasetGraphTxn begin​(TxnType mode)
        Begin a transaction. Terminate a write transaction with Transaction.commit() or Transaction.abort(). Terminate a write transaction with Transaction.close().

      • begin

        public org.apache.jena.tdb.transaction.DatasetGraphTxn begin​(TxnType mode,
                                                             java.lang.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 org.apache.jena.tdb.store.DatasetGraphTDB getBaseDataset()
        Internal operation - to get a dataset for application use, call a TDBFactory function. Do not use the base dataset without knowing how the transaction system uses it.

      • getTransactionManager

        public org.apache.jena.tdb.transaction.TransactionManager getTransactionManager()
        For internal use only

      • 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​(java.lang.String location)
        Obtain a StoreConnection for a particular location

      • reset

        public static void reset()
        Stop managing all locations. Use with great care. Use via TDBInternal.expel(org.apache.jena.sparql.core.DatasetGraph) wherever possible.

      • release

        public static void release​(org.apache.jena.tdb.base.file.Location location)
        Stop managing a location. There should be no transactions running. Use via TDBInternal.expel(org.apache.jena.sparql.core.DatasetGraph) wherever possible.

      • expel

        public static void expel​(org.apache.jena.tdb.base.file.Location location,
                         boolean force)
        Stop managing a location. Use with great care (testing only). Use via TDBInternal.expel(org.apache.jena.sparql.core.DatasetGraph) wherever possible.

      • make

        public static StoreConnection make​(org.apache.jena.tdb.base.file.Location location,
                                   org.apache.jena.tdb.setup.StoreParams params)
        Return a StoreConnection for a particular connection. This is used to create transactions for the database at the location.

      • make

        public static StoreConnection make​(org.apache.jena.tdb.base.file.Location location)
        Make a StoreConnection based on any StoreParams at the location or the system defaults.

      • getExisting

        public static StoreConnection getExisting​(org.apache.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).