Examples of com.dianping.cat.message.Heartbeat

com.dianping.cat.message.Heartbeat

Heartbeat is used to log data that happens in a regular intervals, for example once per second, such as system load, CPU percentage, memory usage, thread pool statistics, cache hit/miss rate, service manifest etc., and even some configuration could be carried by Heartbeat. There could be some good use cases, for example health checker and load balancer, that make good use of it.

Heartbeat should never be used per request since the request is not regular predictable, instead it could be logged in a daemon background thread, or something like a Timer.

All CAT message will be constructed as a message tree and send to back-end for further analysis, and for monitoring. Only Transaction can be a tree node, all other message will be the tree leaf.　The transaction without other messages nested is an atomic transaction.
@author Frankie Wu

  }


  @Test
  public void testHeartbeat() {
    long timestamp = 1325489621987L;
    Heartbeat heartbeat = newHeartbeat("type", "name", timestamp, "0", "here is the data.");


    check(heartbeat, "H2012-01-02 15:33:41.987\ttype\tname\t0\there is the data.\t\n");
  }

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    event.complete();
  }


  @Override
  public void logHeartbeat(String type, String name, String status, String nameValuePairs) {
    Heartbeat heartbeat = newHeartbeat(type, name);


    heartbeat.addData(nameValuePairs);
    heartbeat.setStatus(status);
    heartbeat.complete();
  }

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    while (m_active) {
      long start = MilliSecondTimer.currentTimeMillis();


      if (m_manager.isCatEnabled()) {
        Transaction t = cat.newTransaction("System", "Status");
        Heartbeat h = cat.newHeartbeat("Heartbeat", m_ipAddress);
        StatusInfo status = new StatusInfo();


        t.addData("dumpLocked", m_manager.isDumpLocked());
        try {
          StatusInfoCollector statusInfoCollector = new StatusInfoCollector(m_statistics, m_jars);


          status.accept(statusInfoCollector.setDumpLocked(m_manager.isDumpLocked()));


          buildExtensionData(status);
          h.addData(status.toString());
          h.setStatus(Message.SUCCESS);
        } catch (Throwable e) {
          h.setStatus(e);
          cat.logError(e);
        } finally {
          h.complete();
        }
        t.setStatus(Message.SUCCESS);
        t.complete();
      }
      long elapsed = MilliSecondTimer.currentTimeMillis() - start;

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  }


  @Test
  public void testHeartbeat() throws Exception {
    long timestamp = 1325489621987L;
    Heartbeat heartbeat = newHeartbeat("type", "name", timestamp, "0", "here is the data.");


    MessageTree tree = new DefaultMessageTree();
    tree.setMessage(heartbeat);
    check(tree, heartbeat,
          "<tr><td>H15:33:41.987</td><td>type</td><td>name</td><td>&nbsp;</td><td>here is the data.</td></tr>\r\n");

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    tree.setHostName("group001");
    tree.setIpAddress("192.168.1.1");


    DefaultTransaction t = new DefaultTransaction("A", "n" + i % 2, null);


    Heartbeat heartbeat = newHeartbeat("heartbeat", "fail", m_timestamp, "0");


    t.addChild(heartbeat);


    t.complete();
    t.setDurationInMillis(i * 2);

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        break;
      }


      Event error = new DefaultEvent("Error", "Error", null);
      Event exception = new DefaultEvent("Other", "Exception", null);
      Heartbeat heartbeat = new DefaultHeartbeat("heartbeat", "heartbeat");
      DefaultTransaction transaction = new DefaultTransaction("Transaction", "Transaction", null);


      transaction.setStatus(Transaction.SUCCESS);
      t.addChild(transaction);
      t.addChild(error);

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Related Classes of com.dianping.cat.message.Heartbeat

com.dianping.cat.consumer.heartbeat.HeartbeatAnalyzerTest

com.dianping.cat.consumer.problem.ProblemAnalyzerTest

com.dianping.cat.message.internal.DefaultMessageProducer

com.dianping.cat.message.spi.codec.PlainTextMessageCodecTest

com.dianping.cat.message.spi.core.HtmlMessageCodecTest

com.dianping.cat.status.StatusUpdateTask

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