Examples of com.sleepycat.je.Transaction

com.sleepycat.je.Transaction
The Transaction object is the handle for a transaction. Methods off the transaction handle are used to configure, abort and commit the transaction. Transaction handles are provided to other Berkeley DB methods in order to transactionally protect those operations.
A single Transaction may be used to protect operations for any number of Databases in a given environment. However, a single Transaction may not be used for operations in more than one distinct environment.

Transaction handles are free-threaded; transactions handles may be used concurrently by multiple threads. Once the {@link Transaction#abort Transaction.abort} or {@link Transaction#commit Transaction.commit} methodis called, the handle may not be accessed again, regardless of the success or failure of the method, with one exception: the {@code abort} method maybe called any number of times to simplify error handling.

To obtain a transaction with default attributes:
```
 Transaction txn = myEnvironment.beginTransaction(null, null); 
```
To customize the attributes of a transaction:
```
 TransactionConfig config = new TransactionConfig(); config.setReadUncommitted(true); Transaction txn = myEnvironment.beginTransaction(null, config); 
```

        config.setAllowCreate(true);
        config.setDecrement(true);
        config.setRange(1, 3);
        config.setInitialValue(3);


        Transaction txn = txnBegin();
        Sequence seq = db.openSequence(txn, key, config);
        assertEquals(3, seq.get(txn, 1));
        txnCommit(txn);


        /* Open another handle on the same sequence -- config should match. */

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                " min=" + min + 
                " max=" + max + 
                " delta=" + delta + 
                " cache=" + cache;


            Transaction txn = txnBegin();
            db.removeSequence(txn, key);
            Sequence seq = db.openSequence(txn, key, config);
            txnCommit(txn);


            txn = txnBegin();

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        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setTransactional(isTransactional);
        dbConfig.setAllowCreate(true);
        dbConfig.setSortedDuplicates(duplicates);


        Transaction txn = txnBegin();
        try {
            return env.openDatabase(txn, name, dbConfig);
        } finally {
            txnCommit(txn);
        }

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        DatabaseEntry key = new DatabaseEntry();
        DatabaseEntry data = new DatabaseEntry();
        OperationStatus status;


        /* getLast returns NOTFOUND. */
        Transaction readerTxn = env.beginTransaction(null, txnConfig);
        Cursor cursor = db.openCursor(readerTxn, null);
        status = cursor.getLast(key, data, null);
        assertEquals(OperationStatus.NOTFOUND, status);


        /* Insert key 1 in a writer thread. */
        startInsert(1);
        
        /*
         * If serializable, getLast should return NOTFOUND again; otherwise
         * getLast should see key 1.
         */
        status = cursor.getLast(key, data, null);
        if (txnSerializable) {
            assertEquals(OperationStatus.NOTFOUND, status);
        } else {
            assertEquals(OperationStatus.SUCCESS, status);
            assertEquals(1, IntegerBinding.entryToInt(key));
        }


        /* Close reader to allow writer to finish. */
        cursor.close();
        readerTxn.commitNoSync();
        waitForInsert();


        /* getLast returns key 1. */
        readerTxn = env.beginTransaction(null, txnConfig);
        cursor = db.openCursor(readerTxn, null);
        status = cursor.getLast(key, data, null);
        assertEquals(OperationStatus.SUCCESS, status);
        assertEquals(1, IntegerBinding.entryToInt(key));
        cursor.close();
        readerTxn.commit();


        closeEnv();
    }

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        DatabaseEntry key = new DatabaseEntry();
        DatabaseEntry data = new DatabaseEntry();
        OperationStatus status;


        /* getLast returns NOTFOUND. */
        Transaction readerTxn = env.beginTransaction(null, txnConfig);
        Cursor cursor = db.openCursor(readerTxn, null);
        status = cursor.getLast(key, data, null);
        assertEquals(OperationStatus.NOTFOUND, status);


        /* Insert {1,1} in a writer thread. */
        startInsert(1, 1);
        
        /*
         * If serializable, getLast should return NOTFOUND again; otherwise
         * getLast should see {1,1}.
         */
        status = cursor.getLast(key, data, null);
        if (txnSerializable) {
            assertEquals(OperationStatus.NOTFOUND, status);
        } else {
            assertEquals(OperationStatus.SUCCESS, status);
            assertEquals(1, IntegerBinding.entryToInt(key));
            assertEquals(1, IntegerBinding.entryToInt(data));
        }


        /* Close reader to allow writer to finish. */
        cursor.close();
        readerTxn.commitNoSync();
        waitForInsert();


        /* getLast returns {1,1}. */
        readerTxn = env.beginTransaction(null, txnConfig);
        cursor = db.openCursor(readerTxn, null);
        status = cursor.getLast(key, data, null);
        assertEquals(OperationStatus.SUCCESS, status);
        assertEquals(1, IntegerBinding.entryToInt(key));
        assertEquals(1, IntegerBinding.entryToInt(data));
        cursor.close();
        readerTxn.commit();


        closeEnv();
    }

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        /* Insert key 1 and 3. */
        insert(1);
        insert(3);


        /* getNext returns key 3. */
        Transaction readerTxn = env.beginTransaction(null, txnConfig);
        Cursor cursor = db.openCursor(readerTxn, null);
        assertEquals(OperationStatus.SUCCESS, searchKey(cursor, 1));
        status = cursor.getNext(key, data, null);
        assertEquals(OperationStatus.SUCCESS, status);
        assertEquals(3, IntegerBinding.entryToInt(key));


        /* Insert key 2 in a writer thread. */
        startInsert(2);


        /*
         * If serializable, getNext should return key 3 again; otherwise
         * getNext should see key 2.
         */
        assertEquals(OperationStatus.SUCCESS, searchKey(cursor, 1));
        status = cursor.getNext(key, data, null);
        assertEquals(OperationStatus.SUCCESS, status);
        if (txnSerializable) {
            assertEquals(3, IntegerBinding.entryToInt(key));
        } else {
            assertEquals(2, IntegerBinding.entryToInt(key));
        }


        /* Close reader to allow writer to finish. */
        cursor.close();
        readerTxn.commitNoSync();
        waitForInsert();


        /* getNext returns key 2. */
        readerTxn = env.beginTransaction(null, txnConfig);
        cursor = db.openCursor(readerTxn, null);
        assertEquals(OperationStatus.SUCCESS, searchKey(cursor, 1));
        status = cursor.getNext(key, data, null);
        assertEquals(OperationStatus.SUCCESS, status);
        assertEquals(2, IntegerBinding.entryToInt(key));
        cursor.close();
        readerTxn.commit();


        closeEnv();
    }

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        /* Insert dups. */
        insert(1, 1);
        insert(1, 3);


        /* getNext returns {1,3}. */
        Transaction readerTxn = env.beginTransaction(null, txnConfig);
        Cursor cursor = db.openCursor(readerTxn, null);
        assertEquals(OperationStatus.SUCCESS, searchBoth(cursor, 1, 1));
        status = cursor.getNext(key, data, null);
        assertEquals(OperationStatus.SUCCESS, status);
        assertEquals(1, IntegerBinding.entryToInt(key));
        assertEquals(3, IntegerBinding.entryToInt(data));


        /* Insert {1,2} in a writer thread. */
        startInsert(1, 2);


        /*
         * If serializable, getNext should return {1,3} again; otherwise
         * getNext should see {1,2}.
         */
        assertEquals(OperationStatus.SUCCESS, searchBoth(cursor, 1, 1));
        status = cursor.getNext(key, data, null);
        assertEquals(OperationStatus.SUCCESS, status);
        if (txnSerializable) {
            assertEquals(1, IntegerBinding.entryToInt(key));
            assertEquals(3, IntegerBinding.entryToInt(data));
        } else {
            assertEquals(1, IntegerBinding.entryToInt(key));
            assertEquals(2, IntegerBinding.entryToInt(data));
        }


        /* Close reader to allow writer to finish. */
        cursor.close();
        readerTxn.commitNoSync();
        waitForInsert();


        /* getNext returns {1,2}. */
        readerTxn = env.beginTransaction(null, txnConfig);
        cursor = db.openCursor(readerTxn, null);
        assertEquals(OperationStatus.SUCCESS, searchBoth(cursor, 1, 1));
        status = cursor.getNext(key, data, null);
        assertEquals(OperationStatus.SUCCESS, status);
        assertEquals(1, IntegerBinding.entryToInt(key));
        assertEquals(2, IntegerBinding.entryToInt(data));
        cursor.close();
        readerTxn.commit();


        closeEnv();
    }

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        /* Insert key 1. */
        insert(1);


        /* getNext returns NOTFOUND. */
        Transaction readerTxn = env.beginTransaction(null, txnConfig);
        Cursor cursor = db.openCursor(readerTxn, null);
        assertEquals(OperationStatus.SUCCESS, searchKey(cursor, 1));
        status = cursor.getNext(key, data, null);
        assertEquals(OperationStatus.NOTFOUND, status);


        /* Insert key 2 in a writer thread. */
        startInsert(2);


        /*
         * If serializable, getNext should return NOTFOUND again; otherwise
         * getNext should see key 2.
         */
        assertEquals(OperationStatus.SUCCESS, searchKey(cursor, 1));
        status = cursor.getNext(key, data, null);
        if (txnSerializable) {
            assertEquals(OperationStatus.NOTFOUND, status);
        } else {
            assertEquals(OperationStatus.SUCCESS, status);
            assertEquals(2, IntegerBinding.entryToInt(key));
        }


        /* Close reader to allow writer to finish. */
        cursor.close();
        readerTxn.commitNoSync();
        waitForInsert();


        /* getNext returns key 2. */
        readerTxn = env.beginTransaction(null, txnConfig);
        cursor = db.openCursor(readerTxn, null);
        assertEquals(OperationStatus.SUCCESS, searchKey(cursor, 1));
        status = cursor.getNext(key, data, null);
        assertEquals(OperationStatus.SUCCESS, status);
        assertEquals(2, IntegerBinding.entryToInt(key));
        cursor.close();
        readerTxn.commit();


        closeEnv();
    }

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        /* Insert dups. */
        insert(1, 1);
        insert(1, 2);


        /* getNext returns NOTFOUND. */
        Transaction readerTxn = env.beginTransaction(null, txnConfig);
        Cursor cursor = db.openCursor(readerTxn, null);
        assertEquals(OperationStatus.SUCCESS, searchBoth(cursor, 1, 2));
        status = cursor.getNext(key, data, null);
        assertEquals(OperationStatus.NOTFOUND, status);


        /* Insert {1,3} in a writer thread. */
        startInsert(1, 3);


        /*
         * If serializable, getNext should return NOTFOUND again; otherwise
         * getNext should see {1,3}.
         */
        assertEquals(OperationStatus.SUCCESS, searchBoth(cursor, 1, 2));
        status = cursor.getNext(key, data, null);
        if (txnSerializable) {
            assertEquals(OperationStatus.NOTFOUND, status);
        } else {
            assertEquals(OperationStatus.SUCCESS, status);
            assertEquals(1, IntegerBinding.entryToInt(key));
            assertEquals(3, IntegerBinding.entryToInt(data));
        }


        /* Close reader to allow writer to finish. */
        cursor.close();
        readerTxn.commitNoSync();
        waitForInsert();


        /* getNext returns {1,3}. */
        readerTxn = env.beginTransaction(null, txnConfig);
        cursor = db.openCursor(readerTxn, null);
        assertEquals(OperationStatus.SUCCESS, searchBoth(cursor, 1, 2));
        status = cursor.getNext(key, data, null);
        assertEquals(OperationStatus.SUCCESS, status);
        assertEquals(1, IntegerBinding.entryToInt(key));
        assertEquals(3, IntegerBinding.entryToInt(data));
        cursor.close();
        readerTxn.commit();


        closeEnv();
    }

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        /* Insert dups. */
        insert(1, 1);
        insert(1, 3);


        /* getNextDup returns {1,3}. */
        Transaction readerTxn = env.beginTransaction(null, txnConfig);
        Cursor cursor = db.openCursor(readerTxn, null);
        assertEquals(OperationStatus.SUCCESS, searchBoth(cursor, 1, 1));
        status = cursor.getNextDup(key, data, null);
        assertEquals(OperationStatus.SUCCESS, status);
        assertEquals(1, IntegerBinding.entryToInt(key));
        assertEquals(3, IntegerBinding.entryToInt(data));


        /* Insert {1,2} in a writer thread. */
        startInsert(1, 2);


        /*
         * If serializable, getNextDup should return {1,3} again; otherwise
         * getNextDup should see {1,2}.
         */
        assertEquals(OperationStatus.SUCCESS, searchBoth(cursor, 1, 1));
        status = cursor.getNextDup(key, data, null);
        assertEquals(OperationStatus.SUCCESS, status);
        if (txnSerializable) {
            assertEquals(1, IntegerBinding.entryToInt(key));
            assertEquals(3, IntegerBinding.entryToInt(data));
        } else {
            assertEquals(1, IntegerBinding.entryToInt(key));
            assertEquals(2, IntegerBinding.entryToInt(data));
        }


        /* Close reader to allow writer to finish. */
        cursor.close();
        readerTxn.commitNoSync();
        waitForInsert();


        /* getNextDup returns {1,2}. */
        readerTxn = env.beginTransaction(null, txnConfig);
        cursor = db.openCursor(readerTxn, null);
        assertEquals(OperationStatus.SUCCESS, searchBoth(cursor, 1, 1));
        status = cursor.getNextDup(key, data, null);
        assertEquals(OperationStatus.SUCCESS, status);
        assertEquals(1, IntegerBinding.entryToInt(key));
        assertEquals(2, IntegerBinding.entryToInt(data));
        cursor.close();
        readerTxn.commit();


        closeEnv();
    }

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