Example Analysis of Managed Objects for Tomcat

Analyzing a system of managed objects produces artifacts to guide you as you develop an agent. As an example, analysis of Tomcat might produce this table and this relationship diagram.

Managed Objects in Tomcat
Entity Concept Type Relationships Configuration States Operations
Tomcat Product Top Level Object Manages* > Tomcat  Cluster     Add Cluster

Remove Cluster

Tomcat Cluster Group Members* > Tomcat Server     Add Server

Remove Server

Tomcat Server Process Deploys* > WebApp

Listens* > HTTP Connector

Installation Folder Running

Stopped

Start

Stop

Deploy App

Add Connector

Remove Connector

WebApp Application Listens* > HTTP Connector Context Path Running

Stopped

Start

Stop

HTTP Connector Access Point   Port Number

SSL Parameters

Enabled

Disabled

Enable

Disable

The third step might produce a diagram such as the following:

Relationships among Managed Objects in Tomcat

Tomcat Product can have many Tomcat Clusters. Tomcat Cluster can have many members that are Tomcat Servers. Tomcat Server can deploy many WebApps. Tomcat Server and WebApp both can listen on many HTTP Connectors.

This example does not correspond exactly to the sample Tomcat agent. To illustrate a wider range of concept types, this example explicitly models the cluster and HTTP connector as managed objects. The sample code implements a simpler model, which omits these entities.