Examples of com.sleepycat.je.Database.openSequence() | massapi.com

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Package com.sleepycat.je

Class com.sleepycat.je.Database

Examples of com.sleepycat.je.Database.openSequence()

com.sleepycat.je.Database.openSequence()
Opens a sequence in the database. @param txn For a transactional database, an explicit transaction maybe specified, or null may be specified to use auto-commit. For a non-transactional database, null must be specified. @param key The key {@link DatabaseEntry} of the sequence. @param config The sequence attributes. If null, default attributes areused. @return a new Sequence handle. @throws SequenceExistsException if the sequence record already existsand the {@code SequenceConfig ExclusiveCreate} parameter is true. @throws SequenceNotFoundException if the sequence record does not existand the {@code SequenceConfig AllowCreate} parameter is false. @throws OperationFailureException if one of the Read Operation Failures occurs. If the sequence does not exist and the {@link SequenceConfig#setAllowCreate AllowCreate} parameter is true, then oneof the Write Operation Failures may also occur. @throws EnvironmentFailureException if an unexpected, internal orenvironment-wide failure occurs. @throws UnsupportedOperationException if this database is read-only, orthis database is configured for duplicates. @throws IllegalStateException if the Sequence record is deleted byanother thread during this method invocation, or the database has been closed. @throws IllegalArgumentException if an invalid parameter is specified,for example, an invalid {@code SequenceConfig} parameter.


        SequenceConfig config = new SequenceConfig();
        config.setAllowCreate(true);


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


        txn = txnBegin();


        /* Check default values before calling get(). */

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        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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        txnCommit(txn);


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


        txn = txnBegin();
        Sequence seq2 = db.openSequence(txn, key, config);
        assertEquals(2, seq2.get(txn, 1));
        txnCommit(txn);


        SequenceStats stats = seq2.getStats(null);
        assertEquals(1, stats.getCurrent());

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        /* Create the sequence oject. */
        SequenceConfig config = new SequenceConfig();
        config.setAllowCreate(true);
        DatabaseEntry key =
            new DatabaseEntry(KEY_NAME.getBytes("UTF-8"));
        Sequence seq = db.openSequence(null, key, config);


        /* Allocate a few sequence numbers. */
        for (int i = 0; i < 10; i++) {
            long seqnum = seq.get(null, 1);
            System.out.println("Got sequence number: " + seqnum);

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