Examples of org.apache.flume.Transaction.begin()

org.apache.flume.Transaction.begin()

Starts a transaction boundary for the current channel operation. If a transaction is already in progress, this method will join that transaction using reference counting.

Note: For every invocation of this method there must be a corresponding invocation of {@linkplain #close()} method. Failureto ensure this can lead to dangling transactions and unpredictable results.


    sink.stop();




    Transaction sourceTransaction = sourceChannel.getTransaction();
    sourceTransaction.begin();


    Event sourceEvent = sourceChannel.take();
    Assert.assertNotNull(sourceEvent);
    Assert.assertEquals("Channel contained our event", "Hello avro",
        new String(sourceEvent.getBody()));

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    parms.put("transactionCapacity", "5");
    context.putAll(parms);
    Configurables.configure(channel,  context);


    Transaction transaction = channel.getTransaction();
    transaction.begin();
    for(int i=0; i < 5; i++) {
      channel.put(EventBuilder.withBody(String.format("test event %d", i).getBytes()));
    }
    transaction.commit();
    transaction.close();

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  }


  // helper function
  private static Event takeEvent(Channel channel) {
    Transaction txn = channel.getTransaction();
    txn.begin();
    Event evt = channel.take();
    txn.commit();
    txn.close();
    return evt;
  }

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     * Verify overflow semantics
     */
    transaction = channel.getTransaction();
    boolean overflowed = false;
    try {
      transaction.begin();
      channel.put(EventBuilder.withBody("overflow event".getBytes()));
      transaction.commit();
    } catch (ChannelException e) {
      overflowed = true;
      transaction.rollback();

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     */
    parms.put("capacity", "6");
    context.putAll(parms);
    Configurables.configure(channel, context);
    transaction = channel.getTransaction();
    transaction.begin();
    channel.put(EventBuilder.withBody("extended capacity event".getBytes()));
    transaction.commit();
    transaction.close();


    /*

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    parms.put("transactionCapacity", "2");
    context.putAll(parms);
    Configurables.configure(channel, context);
    for(int i=0; i < 6; i++) {
      transaction = channel.getTransaction();
      transaction.begin();
      Assert.assertNotNull(channel.take());
      transaction.commit();
      transaction.close();
    }
  }

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    parms.put("transactionCapacity", "2");
    context.putAll(parms);
    Configurables.configure(channel,  context);


    Transaction transaction = channel.getTransaction();
    transaction.begin();
    channel.put(EventBuilder.withBody("test".getBytes()));
    channel.put(EventBuilder.withBody("test".getBytes()));
    // shouldn't be able to fit a third in the buffer
    channel.put(EventBuilder.withBody("test".getBytes()));
    Assert.fail();

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    parms.put("transactionCapacity", "3");
    context.putAll(parms);
    Configurables.configure(channel,  context);


    Transaction transaction = channel.getTransaction();
    transaction.begin();
    channel.put(EventBuilder.withBody("test".getBytes()));
    channel.put(EventBuilder.withBody("test".getBytes()));
    channel.put(EventBuilder.withBody("test".getBytes()));
    transaction.commit();
    transaction.close();

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    channel.put(EventBuilder.withBody("test".getBytes()));
    transaction.commit();
    transaction.close();


    transaction = channel.getTransaction();
    transaction.begin();
    channel.put(EventBuilder.withBody("test".getBytes()));
    channel.put(EventBuilder.withBody("test".getBytes()));
    channel.put(EventBuilder.withBody("test".getBytes()));
    // this should kill  it
    transaction.commit();

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    parms.put("transactionCapacity", "3");
    context.putAll(parms);
    Configurables.configure(channel,  context);


    Transaction tx = channel.getTransaction();
    tx.begin();
    channel.put(EventBuilder.withBody("test".getBytes()));
    channel.put(EventBuilder.withBody("test".getBytes()));
    channel.put(EventBuilder.withBody("test".getBytes()));
    tx.commit();
    tx.close();

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