Examples of com.hp.hpl.jena.tdb.StoreConnection

com.hp.hpl.jena.tdb.StoreConnection
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.

    @Test public void trans_readBlock_06()
    {
        // WRITE(start)-READ(start)-WRITE(commit)-READ sees old DSG.
        // READ before WRITE remains seeing old view - READ after WRITE starts 


        StoreConnection sConn = getStoreConnection() ;
        DatasetGraphTxn dsgW = sConn.begin(ReadWrite.WRITE) ;
        DatasetGraphTxn dsgR = sConn.begin(ReadWrite.READ) ;
        
        dsgW.add(q) ;
        dsgW.commit() ;
        dsgW.end() ;
        
        assertFalse(dsgR.contains(q)) ;
        dsgR.end() ;


        DatasetGraphTxn dsgR2 = sConn.begin(ReadWrite.READ) ;
        assertTrue(dsgR2.contains(q)) ;
        
        DatasetGraph dsg = sConn.getBaseDataset() ;
        assertTrue(dsg.contains(q)) ;
    }

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    @Test public void trans_readBlock_07()
    {
        // WRITE(start)-READ(start)-add-WRITE(commit)-READ sees old DSG.
        // READ before WRITE remains seeing old view - READ after WRITE starts 


        StoreConnection sConn = getStoreConnection() ;
        DatasetGraphTxn dsgW = sConn.begin(ReadWrite.WRITE) ;
        dsgW.add(q) ;


        DatasetGraphTxn dsgR = sConn.begin(ReadWrite.READ) ;
        dsgW.commit() ;
        dsgW.end() ;
        
        assertFalse(dsgR.contains(q)) ;
        dsgR.end() ;
        
        DatasetGraphTxn dsgR2 = sConn.begin(ReadWrite.READ) ;
        assertTrue(dsgR2.contains(q)) ;
        dsgR2.end() ;
        
        DatasetGraph dsg = sConn.getBaseDataset() ;
        assertTrue(dsg.contains(q)) ;
    }

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    }


    @Test public void trans_readBlock_08()
    {
        // WRITE(start)-add-READ(start)-WRITE(commit)-READ sees old DSG.
        StoreConnection sConn = getStoreConnection() ;
        DatasetGraphTxn dsgW = sConn.begin(ReadWrite.WRITE) ;
        dsgW.add(q) ;
        
        DatasetGraphTxn dsgR1 = sConn.begin(ReadWrite.READ) ;
        assertFalse(dsgR1.contains(q)) ;  
        
        dsgW.commit() ;
        dsgW.end() ;
        
        DatasetGraphTxn dsgR2 = sConn.begin(ReadWrite.READ) ;
        
        assertFalse(dsgR1.contains(q)) ;    // Before view
        assertTrue(dsgR2.contains(q)) ;     // After view
        dsgR1.end() ;
        dsgR2.end() ;
        
        DatasetGraph dsg = sConn.getBaseDataset() ;
        assertTrue(dsg.contains(q)) ;
    }

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    }


    @Test public void trans_readBlock_09()
    {
        // WRITE(commit)-READ(start)-WRITE(commit)-READ(finish)-check
        StoreConnection sConn = getStoreConnection() ;
        DatasetGraphTxn dsgW1 = sConn.begin(ReadWrite.WRITE) ;
        dsgW1.add(q1) ;
        dsgW1.commit() ;
        dsgW1.end() ;


        DatasetGraphTxn dsgR1 = sConn.begin(ReadWrite.READ) ;
        DatasetGraphTxn dsgW2 = sConn.begin(ReadWrite.WRITE) ;
        dsgW2.add(q2) ;
        dsgW2.commit() ;
        dsgW2.end() ;


        DatasetGraphTxn dsgR2 = sConn.begin(ReadWrite.READ) ;
        assertTrue(dsgR1.contains(q1)) ;
        assertFalse(dsgR1.contains(q2)) ;
        
        assertTrue(dsgR2.contains(q1)) ;
        assertTrue(dsgR2.contains(q2)) ;
        
        dsgR1.end() ;
        dsgR2.end() ;
        
        DatasetGraph dsg = sConn.getBaseDataset() ;
        assertTrue(dsg.contains(q1)) ;
        assertTrue(dsg.contains(q2)) ;
    }

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    }
    
    @Test public void trans_readBlock_10()
    {
        // READ(start)-WRITE(start)-WRITE(finish)-WRITE(start)-READ(finish)-WRITE(finish)-check
        StoreConnection sConn = getStoreConnection() ;


        DatasetGraphTxn dsgR1 = sConn.begin(ReadWrite.READ) ;
        DatasetGraphTxn dsgW1 = sConn.begin(ReadWrite.WRITE) ;
        dsgW1.add(q1) ;
        dsgW1.commit() ;
        dsgW1.end() ;
        
        DatasetGraphTxn dsgW2 = sConn.begin(ReadWrite.WRITE) ;
        dsgW2.add(q2) ;
        dsgR1.end() ;


        dsgW2.commit() ;
        dsgW2.end() ;
        
        sConn.forceRecoverFromJournal() ;
        DatasetGraphTDB dsg = sConn.getBaseDataset() ; 
        assertTrue(dsg.contains(q1)) ;
        assertTrue(dsg.contains(q2)) ;
    }

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    @Test public void trans_readBlock_11()
    {
        // JENA-91
        // READ(start)-WRITE-WRITE-WRITE-READ(finish)-check
        StoreConnection sConn = getStoreConnection() ;


        DatasetGraphTxn dsgR1 = sConn.begin(ReadWrite.READ) ;
        DatasetGraphTxn dsgW1 = sConn.begin(ReadWrite.WRITE) ;
        dsgW1.add(q1) ;
        dsgW1.commit() ;
        dsgW1.end() ;
        
        DatasetGraphTxn dsgW2 = sConn.begin(ReadWrite.WRITE) ;
        dsgW2.add(q2) ;
        dsgW2.commit() ;
        dsgW2.end() ;


        DatasetGraphTxn dsgW3 = sConn.begin(ReadWrite.WRITE) ;
        dsgW3.add(q3) ;
        dsgW3.commit() ;
        dsgW3.end() ;


        dsgR1.end() ;
        
        DatasetGraphTDB dsg = sConn.getBaseDataset() ; 
        assertTrue(dsg.contains(q1)) ;
        assertTrue(dsg.contains(q2)) ;
        assertTrue(dsg.contains(q3)) ;
    }

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    // Not a test
    //@Test (expected=TDBTransactionException.class)
    public void trans_20()
    {
        // Two WRITE : This would block.
        StoreConnection sConn = getStoreConnection() ;
        DatasetGraphTxn dsgW1 = sConn.begin(ReadWrite.WRITE) ;
        DatasetGraphTxn dsgW2 = sConn.begin(ReadWrite.WRITE) ;
    }

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    @Test (expected=TDBException.class) 
    public void trans_21()
    {
        // READ-add
        StoreConnection sConn = getStoreConnection() ;
        DatasetGraphTxn dsg = sConn.begin(ReadWrite.READ) ;
        dsg.add(q) ;
    }

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    @Test //(expected=TDBException.class) 
    public void trans_22()
    {
        // WRITE-close causes implicit abort
        StoreConnection sConn = getStoreConnection() ;
        DatasetGraphTxn dsg = sConn.begin(ReadWrite.WRITE) ;
        dsg.add(q) ;
        dsg.end() ;
    }

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    //@Test 
    public void trans_30()
    {
        // WRITE lots
        StoreConnection sConn = getStoreConnection() ;
        DatasetGraphTxn dsg = sConn.begin(ReadWrite.WRITE) ;
        for ( int i = 0 ; i < 600 ; i++ )
        {
            Quad q = SSE.parseQuad("(_ <s> <p> "+i+")") ;
            dsg.add(q) ;
        }

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