Examples of com.linkedin.databus2.core.BackoffTimerStaticConfig

com.linkedin.databus2.producers.db.GGXMLTrailTransactionFinder
Generic static config for error retries. It is used to model error retries with sleeps between each retry. Allows for configuring error retries with a sleep between each of them.
Sleep is computed using the formula: S' = min(maxSleep, S * sleepIncFactor + sleepIncDelta). Typical use cases:
- No retries: maxRetryNum = 0
- Unlimited retries: maxRetryNum < 0
- No sleep: maxSleep = 0
- Linear backoff: sleepIncFactor = 1.0, sleepIncDelta = slope of the sleep line
- Exponential backoff (base 2): sleepIncFactor = 2.0


    LOG.info("Starting. Producers are :" + _producers);


    for (Entry<PhysicalPartition, EventProducer> entry : _producers
        .entrySet()) {
      EventProducer producer = entry.getValue();
      // now start the default DB puller thread; depending on
      // configuration setting / cmd line
      if (this.getDbPullerStart()) {
        if (producer != null) {
          LOG.info("starting db puller: " + producer.getName());
          producer.start(-1L);
          LOG.info("db puller started: " + producer.getName());
        }
      }
    }
  }

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  @Override
  public void pause() {
    for (Entry<PhysicalPartition, EventProducer> entry : _producers
        .entrySet()) {
      EventProducer producer = entry.getValue();


      if (null != producer) {
        if (producer.isRunning()) {
          producer.pause();
          LOG.info("EventProducer :" + producer.getName()
              + "  pause sent");
        } else if (producer.isPaused()) {
          LOG.info("EventProducer :" + producer.getName()
              + "  already paused");
        }
      }
    }
  }

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  @Override
  public void resume() {
    for (Entry<PhysicalPartition, EventProducer> entry : _producers
        .entrySet()) {
      EventProducer producer = entry.getValue();
      if (null != producer) {
        if (producer.isPaused()) {
          producer.unpause();
          LOG.info("EventProducer :" + producer.getName()
              + "  resume sent");
        } else if (producer.isRunning()) {
          LOG.info("EventProducer :" + producer.getName()
              + "  already running");
        }
      }
    }
  }

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  protected void doShutdown() {
    LOG.warn("Shutting down Relay!");
    for (Entry<PhysicalPartition, EventProducer> entry : _producers
        .entrySet()) {
      PhysicalPartition pPartition = entry.getKey();
      EventProducer producer = entry.getValue();


      if (null != producer
          && (producer.isRunning() || producer.isPaused())) {
        producer.shutdown();
        try {
          producer.waitForShutdown();
        } catch (InterruptedException ie) {
        }
        LOG.info("EventProducer is shutdown!");
      }

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              .getStatsCollector(statsCollectorName),
          maxScnReaderWriters);
    } else if (uri.startsWith("mock")) {
      // Get all relevant pConfig attributes
      //TODO add real instantiation
      EventProducerServiceProvider mockProvider = _producersRegistry.getEventProducerServiceProvider("mock");
      if (null == mockProvider)
      {
        throw new DatabusRuntimeException("relay event producer not available: " + "mock");
      }
      producer = mockProvider.createProducer(pConfig, schemaRegistryService,
                                             dbusEventBuffer,
                                             _inBoundStatsCollectors
                                                     .getStatsCollector(statsCollectorName),
                                             maxScnReaderWriters);
    } else if (uri.startsWith("gg:")){
      producer = new GoldenGateEventProducer(pConfig,
                                             schemaRegistryService,
                                             dbusEventBuffer,
                                             _inBoundStatsCollectors
                                                 .getStatsCollector(statsCollectorName),
                                             maxScnReaderWriters);


    } else if (uri.startsWith("mysql:")){
       LOG.info("Adding OpenReplicatorEventProducer for uri :" + uri);
       final String serviceName = "or";
       EventProducerServiceProvider orProvider = _producersRegistry.getEventProducerServiceProvider(serviceName);
       if (null == orProvider)
       {
         throw new DatabusRuntimeException("relay event producer not available: " + serviceName);
       }
       producer = orProvider.createProducer(pConfig, schemaRegistryService,
                                            dbusEventBuffer,
                                            _inBoundStatsCollectors.getStatsCollector(statsCollectorName),
                                            maxScnReaderWriters);
    } else
     {

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     {
      // Get all relevant pConfig attributes and initialize the nettyThreadPool objects
      RelayEventProducer.DatabusClientNettyThreadPools nettyThreadPools =
            new RelayEventProducer.DatabusClientNettyThreadPools(0,getNetworkTimeoutTimer(),getBossExecutorService(),
                                        getIoExecutorService(), getHttpChannelGroup());
      producer = new RelayEventProducer(pConfig, dbusEventBuffer,
          _inBoundStatsCollectors
              .getStatsCollector(statsCollectorName),
          maxScnReaderWriters,nettyThreadPools);
    }

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    log.info("starting");


    File dir = createTempDir();


    TrailFilePositionSetter posSetter = new TrailFilePositionSetter(dir.getAbsolutePath(), TRAIL_FILENAME_PREFIX);
    GGXMLTrailTransactionFinder finder = new GGXMLTrailTransactionFinder();


    // Now delete the directory to make the locateFilePosition() see null for listFiles() call.
    boolean deleted = dir.delete();
    Assert.assertTrue(deleted, "Deleted the trail directory successfully");

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    createTrailFiles(dir.getAbsolutePath(), TRAIL_FILENAME_PREFIX, 150 /* numTxns, 24 lines each */,
                     1250 /* numLinesPerFile */, 1 /* numLinesPerNewline */, "\n", 0,
                     100 /* corrupt first SCN */, "xyzzy", false, "");


    TrailFilePositionSetter posSetter = new TrailFilePositionSetter(dir.getAbsolutePath(), TRAIL_FILENAME_PREFIX);
    GGXMLTrailTransactionFinder finder = new GGXMLTrailTransactionFinder();
    FilePositionResult res;


    // SCN 100 is corrupted, so 101 is the effective oldest SCN => 100 treated as error:
    res = posSetter.locateFilePosition(100, finder);
    Assert.assertEquals(res.getStatus(), FilePositionResult.Status.ERROR,
                        "expected error for exact-match SCN that's corrupted and oldest in all trail files.");


    // SCN 101 is OK (regexQuery() doesn't fully validate XML):
    finder.reset();
    res = posSetter.locateFilePosition(TrailFilePositionSetter.USE_EARLIEST_SCN, finder);
    assertFilePositionResult(res, dir, 101, FilePositionResult.Status.FOUND);


    log.info(DONE_STRING);
  }

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    createTrailFiles(dir.getAbsolutePath(), TRAIL_FILENAME_PREFIX, 150 /* numTxns, 24 lines each */,
                     1250 /* numLinesPerFile */, 1 /* numLinesPerNewline */, "\n", 0,
                     307 /* corrupt last SCN in 2nd file */, "plugh", false, "");


    TrailFilePositionSetter posSetter = new TrailFilePositionSetter(dir.getAbsolutePath(), TRAIL_FILENAME_PREFIX);
    GGXMLTrailTransactionFinder finder = new GGXMLTrailTransactionFinder();
    FilePositionResult res;


    // corruption at SCN 307 occurs after SCN 299, so latter should be found OK:
    res = posSetter.locateFilePosition(299, finder);
    assertFilePositionResult(res, dir, 299, FilePositionResult.Status.FOUND);


    // SCN 306 is in same transaction as 307, but regexQuery() doesn't fully validate XML => OK
    finder.reset();
    res = posSetter.locateFilePosition(306, finder);
    assertFilePositionResult(res, dir, 306, FilePositionResult.Status.FOUND);


    log.info(DONE_STRING);
  }

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    createTrailFiles(dir.getAbsolutePath(), TRAIL_FILENAME_PREFIX, 150 /* numTxns, 24 lines and 2 SCNs each */,
                     1250 /* numLinesPerFile */, 1 /* numLinesPerNewline */, "\n", 0,
                     399 /* corrupt last SCN in 3rd file */, "quux", false, "");


    TrailFilePositionSetter posSetter = new TrailFilePositionSetter(dir.getAbsolutePath(), TRAIL_FILENAME_PREFIX);
    GGXMLTrailTransactionFinder finder = new GGXMLTrailTransactionFinder();
    FilePositionResult res;


    // corruption at SCN 399 => should get 398 back (same transaction, but again, regexQuery() doesn't fully validate)
    res = posSetter.locateFilePosition(TrailFilePositionSetter.USE_LATEST_SCN, finder);
    assertFilePositionResult(res, dir, 398, FilePositionResult.Status.FOUND);

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