Difference between revisions of "SMILA/Project Concepts/Generic Management And Monitoring Concept"

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Line 115: Line 115:
 
  // the second way to register
 
  // the second way to register
 
  ManagementRegistration.register(category, agent);
 
  ManagementRegistration.register(category, agent);
 +
// the third way to register
 +
ManagementRegistration.register("Crawler/Administration", agent);
  
  

Revision as of 05:00, 4 March 2009

Contents

Description

Now SMILA uses separate modules for Management and for Performance Counters but both uses JMX (jconsole) as a default presentation layer.

During other components development it was found that both modules have issues.

This page is a concept about merging both modules into one generic module and to avoid issues found.

Discussion

Technical proposal

Performance Counters Module Architecture

See Performance Counters API

Management Module Architecture

This chart shows the Management architecture:

ManagementRegistry.png //TODO


Performance Counters Module Architecture issues

  • its impossible to group counters into tree legally by API ( now its used "JMX specific names" hack to group them )
  • its impossible to have few counters nested in one JMX leaf
  • its impossible to predict when counter will be initialized to start tracking because it initialized only on first usage

Management Module Architecture issues

  • its impossible to group agents into tree

Common issues

  • its impossible to mix performance counters and management agents methods nested in one JMX leaf

Proposal

Its suggested to use one registry from management module ( its more generic ) to use operations and counters.

Description and initialization of performance counters will be in the Management Agent implementation. It will allow to group counters (also together with management operations).

class MyAgent implements Agent{
 
   // some management operation
   public  doSomething(args[]);
 
   // some performance counter related to that module
   public PerformanceCounter getCounterOne();
 
   // other performance counter related to that module
   public PerformanceCounter getCounterTwo();
 
}

But its also possible (and suggested) to separate them because dependencies. Mainly Management Agent using service and not used inside the service. And is visa versa for Counters Agent

class MyManagementAgent implements Agent{
  ...
   public  doSomething(args[]);
  ....
 
}
class MyCountersAgent implements Agent{
   public PerformanceCounter getCounterOne();
   public PerformanceCounter getCounterTwo();
}

But how to use externally registered counters. For example Crawler Controller Agent register globally "Total" parameter. Each crawler should able to use it.

Mainly crawler should have access to CrawlerControllerAgent. Its possible to pass CrawlerControllerAgent directly to crawler. Also if CrawlerControllerAgent was registered as service (its preferable way) its possible to find it by OSGi services registry. But also its possible to generate unique ID for crawler agent during registration and use it later.

class ServiceActivatorFirst{
 
      init(){
        POC_AGENT_ID = ManagementRegistration.register(firstPocAgent)
      }
 
      dispose(){
         ManagementRegistration.unregister(POC_AGENT_ID)
      }
   }
 
   // in other class
 
    class TheSecondClass{
 
     usingTheFirstPocAgent(){
      FirstPocAgent firstPocAgent = ManagementRegistration.get(ServiceActivatorFirst.POC_AGENT_ID)
      onePocAgent.getCounterOne().increment();
     }
 
    }


Category Tree Construction

Its suggested to construct categories tree during registration

 ManagementCategory category = ManagementRegistration.getCategory("Crawler").getCategory("Administration");
 
 // first way to register
 category.register(myAgent);
 // the second way to register
 ManagementRegistration.register(category, agent);
 // the third way to register
 ManagementRegistration.register("Crawler/Administration", agent);
 
 
 // unregister
 ManagementRegistration.unregister(agent);
 // or
 category.unregister(myAgent);

Also its suggested to assume that creation/removing of categories is done automatically by ManagementRegistration and ManagementCategory classes.