Examples of DbusEventGenerator

com.linkedin.databus.core.test.DbusEventGenerator
Utility to generate a specified number of DbusEvents. This class is for TESTING ONLY! @author snagaraj

Examples of com.linkedin.databus.core.test.DbusEventGenerator

  public void testMaxEventSize() throws Exception
  {
    DbusEventBuffer dbusBuf =
        new DbusEventBuffer(getConfig(1144, 500, 100, 500, AllocationPolicy.HEAP_MEMORY,
                                      QueuePolicy.OVERWRITE_ON_WRITE, AssertLevel.ALL));
    DbusEventGenerator generator = new DbusEventGenerator();


    // Generate one event that equals the size of the first buffer. We won't be able to
    // append that to the buffer.
    Vector<DbusEvent> events = new Vector<DbusEvent>();
    generator.generateEvents(1, 2, 500, 439, events);
    DbusEventAppender appender = new DbusEventAppender(events,dbusBuf,null, false);
    int eventCount = 0;
    boolean exceptionCaught = false;


    dbusBuf.startEvents();
    try
    {
      eventCount = appender.addEventToBuffer(events.get(0), eventCount);
    }
    catch(DatabusRuntimeException e)
    {
      exceptionCaught = true;
    }
    Assert.assertTrue(exceptionCaught);
    Assert.assertEquals(0, eventCount);
    DbusEventBufferReflector reflector = appender.getDbusEventReflector();
    Assert.assertEquals(0, reflector.getBuffer(0).limit());
    Assert.assertEquals(0, reflector.getBuffer(1).limit());
    Assert.assertEquals(0, reflector.getBuffer(2).limit());


    events.clear();
    dbusBuf =
        new DbusEventBuffer(getConfig(1144, 500, 100, 500, AllocationPolicy.HEAP_MEMORY,
                                      QueuePolicy.OVERWRITE_ON_WRITE, AssertLevel.ALL));
    appender = new DbusEventAppender(events,dbusBuf,null, false);
    generator.generateEvents(1, 20, 500, 438, events);  // total event size = 499
    generator.generateEvents(1, 20, 500, 10, events);   // total event size = 71
    generator.generateEvents(1, 20, 500, 367, events);   // total event size = 428
    generator.generateEvents(1, 1, 500, 10, events);   // event + EOP = 132.


    // We should be able to append the first three events above, filling the two byte buffers completely.
    // And then the last event along with EOP marker in the last byte buffer, filling that to complete
    // one window.
    appender.run();


    // Now try to add one event. Because ScnIndex still has head as -1 for this buffer,
    // we end up getting a DatabusRuntimeException and not being able to add an event.
    // Since this is a rare case, it is TBD whether we need to support this case or not.
    events.clear();
    generator.generateEvents(1, 20, 500, 10, events);   // event size = 71, can append.
    exceptionCaught = false;
    try
    {
      appender.run();
    }

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Examples of com.linkedin.databus.core.test.DbusEventGenerator

  public void testBasicRollback() throws Exception
  {
    // We have 7 byte buffers now, the last one having 200 bytes, others with 500 bytes.
    DbusEventBuffer dbusBuf = new DbusEventBuffer(getConfig(3200, 500, 100, 500, AllocationPolicy.HEAP_MEMORY,
                                      QueuePolicy.OVERWRITE_ON_WRITE, AssertLevel.ALL));
    DbusEventGenerator generator = new DbusEventGenerator();
    Vector<DbusEvent> events = new Vector<DbusEvent>();
    DbusEventAppender appender = new DbusEventAppender(events,dbusBuf,null, false);
    events.clear();


    // Same test case as before, with the first 3 byte buffers having data now.
    generator.generateEvents(1, 20, 500, 438, events);  // total event size = 499
    generator.generateEvents(1, 20, 500, 10, events);   // total event size = 71
    generator.generateEvents(1, 20, 500, 367, events);   // total event size = 428
    generator.generateEvents(1, 1, 500, 10, events);   // event + EOP = 132.
    appender.run();
    DbusEventBufferReflector reflector = appender.getDbusEventReflector();


    // Now we should be able to add an event and roll it back as well.
    events.clear();
    generator.generateEvents(1, 20, 500, 10, events);   // event size = 71, can append.


    long cwp1 = reflector.getCurrentWritePosition().getPosition();
    dbusBuf.startEvents();
    int evCount = 0;
    evCount = appender.addEventToBuffer(events.firstElement(), evCount);

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Examples of com.linkedin.databus.core.test.DbusEventGenerator

  @Test
  public void testCompleteRollback() throws Exception
  {
    DbusEventBuffer dbusBuf = new DbusEventBuffer(getConfig(1144, 500, 100, 500, AllocationPolicy.HEAP_MEMORY,
                                                            QueuePolicy.OVERWRITE_ON_WRITE, AssertLevel.ALL));
    DbusEventGenerator generator = new DbusEventGenerator();
    Vector<DbusEvent> events = new Vector<DbusEvent>();
    DbusEventAppender appender = new DbusEventAppender(events,dbusBuf,null, false);
    events.clear();


    // Same test case as before, with the first 3 byte buffers having data now.
    generator.generateEvents(1, 20, 500, 438, events);  // total event size = 499
    generator.generateEvents(1, 20, 500, 10, events);   // total event size = 71
    generator.generateEvents(1, 20, 500, 367, events);   // total event size = 428
    generator.generateEvents(1, 20, 500, 10, events);   // event = 71.


    dbusBuf.startEvents();
    int evCount = 0;
    for (DbusEvent e : events)
    {

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Examples of com.linkedin.databus.core.test.DbusEventGenerator

      final DbusEventBuffer dbusBuf =
          new DbusEventBuffer(getConfig(1144, 500, 100, 500, AllocationPolicy.HEAP_MEMORY,
                                        QueuePolicy.OVERWRITE_ON_WRITE, AssertLevel.ALL));
      BufferPositionParser parser = dbusBuf.getBufferPositionParser();
      LOG.info("New Batch append 1");
      DbusEventGenerator generator = new DbusEventGenerator();
      Vector<DbusEvent> events = new Vector<DbusEvent>();
      generator.generateEvents(9, 1, 120, 39, events);


      // Add events to the EventBuffer. Now the buffer is full
      DbusEventAppender appender = new DbusEventAppender(events,dbusBuf,null);
      //Logger.getRootLogger().setLevel(Level.ALL);
      appender.run(); // running in the same thread


      LOG.info("Head:" + parser.toString(dbusBuf.getHead()) + ",Tail:" + parser.toString(dbusBuf.getTail()));
      LOG.info("Num buffers :" + dbusBuf.getBuffer().length);
      LOG.info("Buffer :" + Arrays.toString(dbusBuf.getBuffer()));


      long headPos = dbusBuf.getHead();
      long tailPos = dbusBuf.getTail();
      long headGenId = parser.bufferGenId(headPos);
      long headIndexId = parser.bufferIndex(headPos);
      long headOffset = parser.bufferOffset(headPos);
      long tailGenId = parser.bufferGenId(tailPos);
      long tailIndexId = parser.bufferIndex(tailPos);
      long tailOffset = parser.bufferOffset(tailPos);


      assertEquals("Head GenId", 0, headGenId);
      assertEquals("Head Index", 1, headIndexId);
      assertEquals("Head Offset", 222, headOffset);
      assertEquals("Tail GenId", 1, tailGenId);
      assertEquals("Tail Index", 0, tailIndexId);
      assertEquals("Tail Offset", 483, tailOffset);




      LOG.info("New Batch append 2");
      generator = new DbusEventGenerator(100);
      events = new Vector<DbusEvent>();
      generator.generateEvents(1, 1, 80, 10, events);


      // Add events to the EventBuffer. Now the buffer is full
      appender = new DbusEventAppender(events,dbusBuf,null);
      //Logger.getRootLogger().setLevel(Level.ALL);
      appender.run();
      LOG.info("Head:" + parser.toString(dbusBuf.getHead()) + ",Tail:" + parser.toString(dbusBuf.getTail()));
      LOG.info("Num buffers :" + dbusBuf.getBuffer().length);
      LOG.info("Buffer :" + Arrays.toString(dbusBuf.getBuffer()));
      headPos = dbusBuf.getHead();
      tailPos = dbusBuf.getTail();
      headGenId = parser.bufferGenId(headPos);
      headIndexId = parser.bufferIndex(headPos);
      headOffset = parser.bufferOffset(headPos);
      tailGenId = parser.bufferGenId(tailPos);
      tailIndexId = parser.bufferIndex(tailPos);
      tailOffset = parser.bufferOffset(tailPos);
      assertEquals("Head GenId", 0, headGenId);
      assertEquals("Head Index", 1, headIndexId);
      assertEquals("Head Offset", 222, headOffset);
      assertEquals("Tail GenId", 1, tailGenId);
      assertEquals("Tail Index", 1, tailIndexId);
      assertEquals("Tail Offset", 193, tailOffset);




      LOG.info("New Batch append 3");
      generator = new DbusEventGenerator(200);
      events = new Vector<DbusEvent>();
      generator.generateEvents(1, 1, 400, 320, events);


      // Add events to the EventBuffer. Now the buffer is full
      appender = new DbusEventAppender(events,dbusBuf,null);
      //Logger.getRootLogger().setLevel(Level.ALL);
      appender.run();
      LOG.info("Head:" + parser.toString(dbusBuf.getHead()) + ",Tail:" + parser.toString(dbusBuf.getTail()));
      LOG.info("Num buffers :" + dbusBuf.getBuffer().length);
      LOG.info("Buffer :" + Arrays.toString(dbusBuf.getBuffer()));
      headPos = dbusBuf.getHead();
      tailPos = dbusBuf.getTail();
      headGenId = parser.bufferGenId(headPos);
      headIndexId = parser.bufferIndex(headPos);
      headOffset = parser.bufferOffset(headPos);
      tailGenId = parser.bufferGenId(tailPos);
      tailIndexId = parser.bufferIndex(tailPos);
      tailOffset = parser.bufferOffset(tailPos);
      assertEquals("Head GenId", 1, headGenId);
      assertEquals("Head Index", 1, headIndexId);
      assertEquals("Head Offset", 61, headOffset);
      assertEquals("Tail GenId", 2, tailGenId);
      assertEquals("Tail Index", 0, tailIndexId);
      assertEquals("Tail Offset", 442, tailOffset);
    }




    // Single byte-buffer EVB case
    {
      //Logger.getRootLogger().setLevel(Level.INFO);
      final DbusEventBuffer dbusBuf =
          new DbusEventBuffer(getConfig(2144, 5000, 200, 500, AllocationPolicy.HEAP_MEMORY,
                                        QueuePolicy.OVERWRITE_ON_WRITE, AssertLevel.ALL));
      BufferPositionParser parser = dbusBuf.getBufferPositionParser();
      LOG.info("New Batch append 1");
      DbusEventGenerator generator = new DbusEventGenerator();
      Vector<DbusEvent> events = new Vector<DbusEvent>();
      generator.generateEvents(28, 2, 180, 39, events);


      // Add events to the EventBuffer. Now the buffer is full
      DbusEventAppender appender = new DbusEventAppender(events,dbusBuf,null);
      //Logger.getRootLogger().setLevel(Level.ALL);
      appender.run(); // running in the same thread


      LOG.info("Head:" + parser.toString(dbusBuf.getHead()) + ",Tail:" + parser.toString(dbusBuf.getTail()));
      LOG.info("Num buffers :" + dbusBuf.getBuffer().length);
      LOG.info("Buffer :" + Arrays.toString(dbusBuf.getBuffer()));
      long headPos = dbusBuf.getHead();
      long tailPos = dbusBuf.getTail();
      long headGenId = parser.bufferGenId(headPos);
      long headIndexId = parser.bufferIndex(headPos);
      long headOffset = parser.bufferOffset(headPos);
      long tailGenId = parser.bufferGenId(tailPos);
      long tailIndexId = parser.bufferIndex(tailPos);
      long tailOffset = parser.bufferOffset(tailPos);


      assertEquals("Head GenId", 0, headGenId);
      assertEquals("Head Index", 0, headIndexId);
      assertEquals("Head Offset", 1627, headOffset);
      assertEquals("Tail GenId", 1, tailGenId);
      assertEquals("Tail Index", 0, tailIndexId);
      assertEquals("Tail Offset", 1627, tailOffset);


      LOG.info("New Batch append 2");
      generator = new DbusEventGenerator(200);
      events = new Vector<DbusEvent>();
      generator.generateEvents(1, 1, 80, 10, events);


      // Add events to the EventBuffer. Now the buffer is full
      appender = new DbusEventAppender(events,dbusBuf,null);
      //Logger.getRootLogger().setLevel(Level.ALL);
      appender.run();
      LOG.info("Head:" + parser.toString(dbusBuf.getHead()) + ",Tail:" + parser.toString(dbusBuf.getTail()));
      LOG.info("Num buffers :" + dbusBuf.getBuffer().length);
      LOG.info("Buffer :" + Arrays.toString(dbusBuf.getBuffer()));
      headPos = dbusBuf.getHead();
      tailPos = dbusBuf.getTail();
      headGenId = parser.bufferGenId(headPos);
      headIndexId = parser.bufferIndex(headPos);
      headOffset = parser.bufferOffset(headPos);
      tailGenId = parser.bufferGenId(tailPos);
      tailIndexId = parser.bufferIndex(tailPos);
      tailOffset = parser.bufferOffset(tailPos);


      assertEquals("Head GenId", 0, headGenId);
      assertEquals("Head Index", 0, headIndexId);
      assertEquals("Head Offset", 1888, headOffset);
      assertEquals("Tail GenId", 1, tailGenId);
      assertEquals("Tail Index", 0, tailIndexId);
      assertEquals("Tail Offset", 1820, tailOffset);


      LOG.info("New Batch append 3");
      generator = new DbusEventGenerator(300);
      events = new Vector<DbusEvent>();
      generator.generateEvents(1, 1, 400, 330, events);


      // Add events to the EventBuffer. Now the buffer is full
      appender = new DbusEventAppender(events,dbusBuf,null);
      //Logger.getRootLogger().setLevel(Level.ALL);
      appender.run();

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Examples of com.linkedin.databus.core.test.DbusEventGenerator

    final DbusEventBuffer dbusBuf =
        new DbusEventBuffer(getConfig(1145,5000,100,500,AllocationPolicy.HEAP_MEMORY,
                                      QueuePolicy.OVERWRITE_ON_WRITE,
                                      AssertLevel.ALL));
    BufferPositionParser parser = dbusBuf.getBufferPositionParser();
    DbusEventGenerator generator = new DbusEventGenerator();
    Vector<DbusEvent> events = new Vector<DbusEvent>();
    generator.generateEvents(9, 3, 120, 39, events);


    // Add events to the EventBuffer. Now the buffer is full
    DbusEventAppender appender = new DbusEventAppender(events,dbusBuf,null);
    //Logger.getRootLogger().setLevel(Level.ALL);
    appender.run(); // running in the same thread


    LOG.info("Head:" + parser.toString(dbusBuf.getHead()) +
             ",Tail:" + parser.toString(dbusBuf.getTail()));


    long headPos = dbusBuf.getHead();
    long tailPos = dbusBuf.getTail();
    long scnIndexHead = dbusBuf.getScnIndex().getHead();
    long scnIndexTail = dbusBuf.getScnIndex().getTail();
    long headGenId = parser.bufferGenId(headPos);
    long headIndexId = parser.bufferIndex(headPos);
    long headOffset = parser.bufferOffset(headPos);
    long tailGenId = parser.bufferGenId(tailPos);
    long tailIndexId = parser.bufferIndex(tailPos);
    long tailOffset = parser.bufferOffset(tailPos);


    assertEquals("Head GenId", 0, headGenId);
    assertEquals("Head Index", 0, headIndexId);
    assertEquals("Head Offset", 0, headOffset);
    assertEquals("Tail GenId", 0, tailGenId);
    assertEquals("Tail Index", 0, tailIndexId);
    assertEquals("Tail Offset", 1144, tailOffset);
    assertEquals("SCNIndex Head",0,scnIndexHead);
    assertEquals("SCNIndex Tail",80,scnIndexTail);


    LOG.info("ScnIndex Head is :" + scnIndexHead + ", ScnIndex Tail is :" + scnIndexTail);




    events = new Vector<DbusEvent>();
    generator = new DbusEventGenerator(100);
    /*
     * The event size is carefully created such that after adding 2nd
     * event CWP and tail points to the same location. Now the 3rd event corrupts the EVB and index (in the presence of bug).
     */


    generator.generateEvents(3, 2, 150, 89, events);


    appender = new DbusEventAppender(events,dbusBuf,null);
    appender.run(); // running in the same thread


    LOG.info("Head:" + parser.toString(dbusBuf.getHead()) + ",Tail:" + parser.toString(dbusBuf.getTail()));

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Examples of com.linkedin.databus.core.test.DbusEventGenerator

  {
    final DbusEventBuffer dbusBuf =
        new DbusEventBuffer(getConfig(1145,5000,100,500,AllocationPolicy.HEAP_MEMORY,
                                      QueuePolicy.OVERWRITE_ON_WRITE, AssertLevel.ALL));
    BufferPositionParser parser = dbusBuf.getBufferPositionParser();
    DbusEventGenerator generator = new DbusEventGenerator();
    Vector<DbusEvent> events = new Vector<DbusEvent>();
    generator.generateEvents(9, 3, 120, 39, events);


    // Add events to the EventBuffer. Now the buffer is full
    DbusEventAppender appender = new DbusEventAppender(events,dbusBuf,null);
    appender.run(); // running in the same thread


    LOG.info("Head:" + parser.toString(dbusBuf.getHead()) + ",Tail:" + parser.toString(dbusBuf.getTail()));


    long headPos = dbusBuf.getHead();
    long tailPos = dbusBuf.getTail();
    long scnIndexHead = dbusBuf.getScnIndex().getHead();
    long scnIndexTail = dbusBuf.getScnIndex().getTail();
    long headGenId = parser.bufferGenId(headPos);
    long headIndexId = parser.bufferIndex(headPos);
    long headOffset = parser.bufferOffset(headPos);
    long tailGenId = parser.bufferGenId(tailPos);
    long tailIndexId = parser.bufferIndex(tailPos);
    long tailOffset = parser.bufferOffset(tailPos);


    assertEquals("Head GenId", 0, headGenId);
    assertEquals("Head Index", 0, headIndexId);
    assertEquals("Head Offset", 0, headOffset);
    assertEquals("Tail GenId", 0, tailGenId);
    assertEquals("Tail Index", 0, tailIndexId);
    assertEquals("Tail Offset", 1144, tailOffset);
    assertEquals("SCNIndex Head",0,scnIndexHead);
    assertEquals("SCNIndex Tail",80,scnIndexTail);




    headPos = parser.setGenId(headPos, 300);
    tailPos = parser.setGenId(tailPos, 300);
    dbusBuf.setHead(headPos);
    dbusBuf.setTail(tailPos);
    dbusBuf.recreateIndex();


    events = new Vector<DbusEvent>();
    generator = new DbusEventGenerator(1000);
    /*
     * The event size is carefully created such that after adding 2nd
     * event CWP and tail points to the same location. Now the 3rd event corrupts the EVB and index (in the presence of bug).
     */
    generator.generateEvents(3, 2, 150, 89, events);


    appender = new DbusEventAppender(events,dbusBuf,null);
    LOG.info("1");
    //Logger.getRootLogger().setLevel(Level.ALL);
    appender.run(); // running in the same thread

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Examples of com.linkedin.databus.core.test.DbusEventGenerator

  {
    final DbusEventBuffer dbusBuf =
        new DbusEventBuffer(getConfig(1145,5000,100,500,AllocationPolicy.HEAP_MEMORY,
                                      QueuePolicy.OVERWRITE_ON_WRITE, AssertLevel.ALL));
    BufferPositionParser parser = dbusBuf.getBufferPositionParser();
    DbusEventGenerator generator = new DbusEventGenerator();
    Vector<DbusEvent> events = new Vector<DbusEvent>();
    generator.generateEvents(9, 3, 120, 39, events);


    // Add events to the EventBuffer. Now the buffer is full
    DbusEventAppender appender = new DbusEventAppender(events,dbusBuf,null);
    appender.run(); // running in the same thread


    LOG.info("Head:" + parser.toString(dbusBuf.getHead()) + ",Tail:" + parser.toString(dbusBuf.getTail()));


    long headPos = dbusBuf.getHead();
    long tailPos = dbusBuf.getTail();
    long scnIndexHead = dbusBuf.getScnIndex().getHead();
    long scnIndexTail = dbusBuf.getScnIndex().getTail();
    long headGenId = parser.bufferGenId(headPos);
    long headIndexId = parser.bufferIndex(headPos);
    long headOffset = parser.bufferOffset(headPos);
    long tailGenId = parser.bufferGenId(tailPos);
    long tailIndexId = parser.bufferIndex(tailPos);
    long tailOffset = parser.bufferOffset(tailPos);




    assertEquals("Head GenId", 0, headGenId);
    assertEquals("Head Index", 0, headIndexId);
    assertEquals("Head Offset", 0, headOffset);
    assertEquals("Tail GenId", 0, tailGenId);
    assertEquals("Tail Index", 0, tailIndexId);
    assertEquals("Tail Offset", 1144, tailOffset);
    assertEquals("SCNIndex Head",0,scnIndexHead);
    assertEquals("SCNIndex Tail",80,scnIndexTail);


    LOG.info("ScnIndex Head is :" + scnIndexHead + ", ScnIndex Tail is :" + scnIndexTail);




    /*
     * Dump lots of events
     */
    events = new Vector<DbusEvent>();
    generator = new DbusEventGenerator(100);
    generator.generateEvents(655, 3, 150, 89, events);
    appender = new DbusEventAppender(events,dbusBuf,null);
    appender.run(); // running in the same thread
    LOG.info("Head:" + parser.toString(dbusBuf.getHead()) + ",Tail:" + parser.toString(dbusBuf.getTail()));


    headPos = dbusBuf.getHead();
    tailPos = dbusBuf.getTail();
    headGenId = parser.bufferGenId(headPos);
    headIndexId = parser.bufferIndex(headPos);
    headOffset = parser.bufferOffset(headPos);
    tailGenId = parser.bufferGenId(tailPos);
    tailIndexId = parser.bufferIndex(tailPos);
    tailOffset = parser.bufferOffset(tailPos);
    scnIndexHead = dbusBuf.getScnIndex().getHead();
    scnIndexTail = dbusBuf.getScnIndex().getTail();
    assertEquals("Head GenId", 109, headGenId);
    assertEquals("Head Index", 0, headIndexId);
    assertEquals("Head Offset", 511, headOffset);
    assertEquals("Tail GenId", 110, tailGenId);
    assertEquals("Tail Index", 0, tailIndexId);
    assertEquals("Tail Offset", 211, tailOffset);
    assertEquals("SCNIndex Head",32,scnIndexHead);
    assertEquals("SCNIndex Tail",16,scnIndexTail);


    /*
     * The event size is carefully created such that after adding 2nd
     * event CWP and tail points to the same location.
     */
    events = new Vector<DbusEvent>();
    generator = new DbusEventGenerator(10000);
    generator.generateEvents(3, 5, 100, 28, events);


    appender = new DbusEventAppender(events,dbusBuf,null);
    appender.run(); // running in the same thread


    LOG.info("Head:" + parser.toString(dbusBuf.getHead()) + ",Tail:" + parser.toString(dbusBuf.getTail()));


    events = new Vector<DbusEvent>();
    generator = new DbusEventGenerator(10000);
    generator.generateEvents(3, 3, 120, 19, events);


    headPos = dbusBuf.getHead();
    tailPos = dbusBuf.getTail();
    headGenId = parser.bufferGenId(headPos);
    headIndexId = parser.bufferIndex(headPos);

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Examples of com.linkedin.databus.core.test.DbusEventGenerator

     */
    final DbusEventBuffer dbusBuf =
        new DbusEventBuffer(getConfig(1000,1000,100,500,AllocationPolicy.HEAP_MEMORY,
                                      QueuePolicy.BLOCK_ON_WRITE, AssertLevel.NONE));
    BufferPositionParser parser = dbusBuf.getBufferPositionParser();
    DbusEventGenerator generator = new DbusEventGenerator();
    Vector<DbusEvent> events = new Vector<DbusEvent>();
    generator.generateEvents(11, 11, 100, 10, events);


    // Add events to the EventBuffer
    DbusEventAppender appender = new DbusEventAppender(events,dbusBuf,null);
    appender.run(); // running in the same thread

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Examples of com.linkedin.databus.core.test.DbusEventGenerator

    //dbusBuf2.getLog().setLevel(Level.DEBUG);


    BufferPositionParser parser = dbusBuf.getBufferPositionParser();
    final BufferPositionParser parser2 = dbusBuf2.getBufferPositionParser();


    DbusEventGenerator generator = new DbusEventGenerator();
    Vector<DbusEvent> events = new Vector<DbusEvent>();
    generator.generateEvents(24, 24, 100, 10, events);
    log.info("Num Events :" + events.size());


    // Add events to the EventBuffer
    DbusEventAppender appender = new DbusEventAppender(events, dbusBuf, null);
    appender.run();

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Examples of com.linkedin.databus.core.test.DbusEventGenerator


    DbusEventBuffer dbusBuf =
        new DbusEventBuffer(getConfig(10000, 10000, 320, 500, AllocationPolicy.HEAP_MEMORY,
                                      QueuePolicy.OVERWRITE_ON_WRITE, AssertLevel.ALL));


    DbusEventGenerator generator = new DbusEventGenerator();
    Vector<DbusEvent> events = new Vector<DbusEvent>();
    generator.generateEvents(215, 5, 100, 10, events);


    // Add events to the EventBuffer
    DbusEventAppender appender = new DbusEventAppender(events,dbusBuf,null);
    appender.run();


    LOG.info("Dbus Event Buffer is :" + dbusBuf);
    LOG.info("SCNIndex is :" + dbusBuf.getScnIndex());


    assertEquals("ScnIndex Head Location", 256, dbusBuf.getScnIndex().getHead());
    assertEquals("ScnIndex Tail Location", 256, dbusBuf.getScnIndex().getTail());
    assertEquals("EVB Head Location", 8381, dbusBuf.getHead());
    long oldEVBTail = 40733;
    assertEquals("EVB Tail Location", oldEVBTail, dbusBuf.getTail());


    dbusBuf.getScnIndex().printVerboseString(LOG, Level.DEBUG);


    long lastScn = events.get(events.size() - 1).sequence();
    generator = new DbusEventGenerator(lastScn + 1);
    events = new Vector<DbusEvent>();
    generator.generateEvents(3, 3, 80, 10, events);
    appender = new DbusEventAppender(events,dbusBuf,null);
    appender.run();


    // Ensure SCNINdex tail did not move.
    assertEquals("ScnIndex Head Location", 256, dbusBuf.getScnIndex().getHead());

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