Examples of com.dianping.cat.message.Transaction

com.dianping.cat.message.Transaction

Transaction is any interesting unit of work that takes time to complete and may fail.

Basically, all data access across the boundary needs to be logged as a Transaction since it may fail and time consuming. For example, URL request, disk IO, JDBC query, search query, HTTP request, 3rd party API call etc.

Sometime if A needs call B which is owned by another team, although A and B are deployed together without any physical boundary. To make the ownership clear, there could be some Transaction logged when A calls B.

Most of Transaction should be logged in the infrastructure level or framework level, which is transparent to the application.

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

  }


  private class DependencyReloadTask implements Task {


    private void buildGraph(List<DependencyReport> reports) {
      Transaction t = Cat.newTransaction(DEPENDENCY, "BuildGraph");
      try {
        m_graphBuilder.getGraphs().clear();
        for (DependencyReport report : reports) {
          m_graphBuilder.visitDependencyReport(report);
        }
        Map<Long, TopologyGraph> graphs = m_graphBuilder.getGraphs();


        for (Entry<Long, TopologyGraph> entry : graphs.entrySet()) {
          m_topologyGraphs.put(entry.getKey(), entry.getValue());


          m_topologyGraphs.remove(entry.getKey() - TimeHelper.ONE_HOUR * 2);
        }
        t.setStatus(Message.SUCCESS);
      } catch (Exception e) {
        t.setStatus(e);
      } finally {
        t.complete();
      }
    }

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    private List<DependencyReport> fetchReport(Collection<String> domains) {
      long current = System.currentTimeMillis();
      long currentHour = current - current % TimeHelper.ONE_HOUR;
      List<DependencyReport> reports = new ArrayList<DependencyReport>();
      Transaction t = Cat.newTransaction(DEPENDENCY, "FetchReport");


      try {
        for (String temp : domains) {
          try {
            ModelRequest request = new ModelRequest(temp, ModelPeriod.CURRENT.getStartTime()).setProperty("date",
                  String.valueOf(currentHour));
            if (m_service.isEligable(request)) {
              ModelResponse<DependencyReport> response = m_service.invoke(request);
              DependencyReport report = response.getModel();


              if (report != null) {
                reports.add(report);
              }
            } else {
              m_logger.warn(String.format("Can't get dependency report of %s", temp));
            }
          } catch (Exception e) {
            Cat.logError(e);
          }
        }
        t.setStatus(Message.SUCCESS);
      } catch (Exception e) {
        t.setStatus(e);
      } finally {
        t.complete();
      }
      return reports;
    }

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    @Override
    public void run() {
      boolean active = true;


      while (active) {
        Transaction t = Cat.newTransaction(DEPENDENCY, "Reload");
        long current = System.currentTimeMillis();
        try {
          Collection<String> domains = queryAllDomains();


          buildGraph(fetchReport(domains));
          t.setStatus(Transaction.SUCCESS);
        } catch (Exception e) {
          m_logger.error(e.getMessage(), e);
          t.setStatus(e);
        } finally {
          t.complete();
        }
        long duration = System.currentTimeMillis() - current;


        try {
          int maxDuration = 60 * 1000;

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    m_queue = Reflects.forField().getDeclaredFieldValue(queue.getClass(), "m_queue", queue);
  }


  public void testNormal() throws Exception {
    MessageProducer producer = Cat.getProducer();
    Transaction t = producer.newTransaction("URL", "MyPage");


    try {
      // do your business here
      t.addData("k1", "v1");
      t.addData("k2", "v2");
      t.addData("k3", "v3");


      Thread.sleep(20);


      producer.logEvent("URL", "Payload", Message.SUCCESS, "host=my-host&ip=127.0.0.1&agent=...");
      t.setStatus(Message.SUCCESS);
    } catch (Exception e) {
      t.setStatus(e);
    } finally {
      t.complete();
    }


    // please stop CAT server when you run this test case
    Assert.assertEquals("One message should be in the queue.", 1, m_queue.size());


    MessageTree tree = m_queue.poll();
    Message m = tree.getMessage();


    Assert.assertTrue(Transaction.class.isAssignableFrom(m.getClass()));


    Transaction trans = (Transaction) m;


    Assert.assertEquals("URL", trans.getType());
    Assert.assertEquals("MyPage", trans.getName());
    Assert.assertEquals("0", trans.getStatus());
    Assert.assertTrue(trans.getDurationInMillis() > 0);
    Assert.assertEquals("k1=v1&k2=v2&k3=v3", trans.getData().toString());


    Assert.assertEquals(1, trans.getChildren().size());


    Message c = trans.getChildren().get(0);


    Assert.assertEquals("URL", c.getType());
    Assert.assertEquals("Payload", c.getName());
    Assert.assertEquals("0", c.getStatus());
    Assert.assertEquals("host=my-host&ip=127.0.0.1&agent=...", c.getData().toString());

View Full Code Here

  }


  @Test
  public void testNormal() throws Exception {
    MessageProducer producer = Cat.getProducer();
    Transaction t = producer.newTransaction("URL", "MyPage");


    try {
      // do your business here
      t.addData("k1", "v1");
      t.addData("k2", "v2");
      t.addData("k3", "v3");


      Thread.sleep(20);


      producer.logEvent("URL", "Payload", Message.SUCCESS, "host=my-host&ip=127.0.0.1&agent=...");
      t.setStatus(Message.SUCCESS);
    } catch (Exception e) {
      t.setStatus(e);
    } finally {
      t.complete();
    }


    // please stop CAT server when you run this test case
    Assert.assertEquals("One message should be in the queue.", 1, m_queue.size());


    MessageTree tree = m_queue.poll();
    Message m = tree.getMessage();


    Assert.assertTrue(Transaction.class.isAssignableFrom(m.getClass()));


    Transaction trans = (Transaction) m;


    Assert.assertEquals("URL", trans.getType());
    Assert.assertEquals("MyPage", trans.getName());
    Assert.assertEquals("0", trans.getStatus());
    Assert.assertTrue(trans.getDurationInMillis() > 0);
    Assert.assertEquals("k1=v1&k2=v2&k3=v3", trans.getData().toString());


    Assert.assertEquals(1, trans.getChildren().size());


    Message c = trans.getChildren().get(0);


    Assert.assertEquals("URL", c.getType());
    Assert.assertEquals("Payload", c.getName());
    Assert.assertEquals("0", c.getStatus());
    Assert.assertEquals("host=my-host&ip=127.0.0.1&agent=...", c.getData().toString());

View Full Code Here

  @Test
  public void testNested() throws Exception {
    Stack<Transaction> stack = new Stack<Transaction>();


    for (int i = 0; i < 10; i++) {
      Transaction t = Cat.getProducer().newTransaction("Test", "TestName");


      t.addData("k1", "v1");
      t.addData("k2", "v2");
      t.addData("k3", "v3");


      stack.push(t);
    }


    while (!stack.isEmpty()) {
      Transaction t = stack.pop();


      t.setStatus(Message.SUCCESS);
      t.complete();
    }


    // please stop CAT server when you run this test case
    Assert.assertEquals("One message should be in the queue.", 1, m_queue.size());

View Full Code Here


    Thread.sleep(1000);
  }


  private MessageTree buildMessages() {
    Transaction t = Cat.newTransaction("type1", "name1\t\n\t\n\\");
    Transaction t2 = Cat.newTransaction("type2", "name\t\n\t\n2\\");
    Transaction t3 = Cat.newTransaction("type3", "name3\t\n\t\n\\");
    Transaction t4 = Cat.newTransaction("type4", "name4\t\n\t\n\\");
    Transaction t5 = Cat.newTransaction("type4", "name4\t\n\t\n\\");
    Transaction t6 = Cat.newTransaction("type4", "name4\t\n\t\n\\");
    Transaction t7 = Cat.newTransaction("type4", "name4\t\n\t\n\\");
    Transaction t8 = Cat.newTransaction("type4", "name4\t\n\t\n\\");


    Cat.logEvent("type1\t\n", "name\t\n", "sdfsdf\t\n", convertException(new NullPointerException()));
    Cat.logHeartbeat("type1\t\n", "name\t\n", "sdfsdf\t\n", convertException(new NullPointerException()));


    Cat.logError(new RuntimeException());


    for (int i = 0; i < 50; i++) {
      Cat.logEvent("type1\t\n", "name\t\n", "sdfsdf\t\n", "");
    }
    for (int i = 0; i < 10; i++) {
      Cat.logError(new RuntimeException());
    }


    t5.complete();
    t6.complete();
    t7.complete();
    t8.complete();
    t2.addData(convertException(new NullPointerException()));
    t2.setStatus(convertException(new NullPointerException()));
    t4.complete();
    t3.complete();
    t2.complete();

View Full Code Here

  }


  @Test
  public void testMode1() throws Exception {
    String url = "http://localhost:2282/mock/mode1";
    Transaction t = Cat.newTransaction("Mock", "testMode1");


    try {
      String childId = Cat.createMessageId();
      String id = Cat.getManager().getThreadLocalMessageTree().getMessageId();


      Cat.logEvent("RemoteCall", url, Message.SUCCESS, childId);


      InputStream in = Urls.forIO().connectTimeout(100) //
            .header("X-Cat-Id", childId) //
            .header("X-Cat-Parent-Id", id) //
            .header("X-Cat-Root-Id", id) //
            .openStream(url);
      String content = Files.forIO().readFrom(in, "utf-8");


      Assert.assertEquals("mock content here!", content);


      t.setStatus(Message.SUCCESS);
    } finally {
      t.complete();
    }


    TimeUnit.MILLISECONDS.sleep(100);
  }

View Full Code Here


    MessageTree tree = Cat.getManager().getThreadLocalMessageTree();


    tree.setMessageId(rootId);


    Transaction t = Cat.newTransaction("Mock", "testMode2");
    Cat.logEvent("RemoteCall", url, Message.SUCCESS, id);
    t.setStatus(Message.SUCCESS);
    t.complete();


    TimeUnit.MILLISECONDS.sleep(100);
  }

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    private static final long serialVersionUID = 1L;


    @Override
    protected void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
      PrintWriter writer = res.getWriter();
      Transaction t = Cat.newTransaction("Mock", req.getRequestURI());


      try {
        writer.write("mock content here!");


        // no status set by purpose
      } finally {
        t.complete();
      }
    }

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