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markt: I'd like to see a little more high level architecture to steer development. For example, is there a common core of management functionality that we then wrap with a web-based GUI and a CLI? That would allow others to write other wrappers to plug this into other tools.

vlad: I would like to provide as much detail as you need, but I'm afraid I still I don't quite understand exactly what you do you refer as the architecture. Anyway, below is a general overview of the software modules and their responsibilities.

TomcatGridSoftwareModules.png

_The modules are:

• Core module: Shared logic to be used by all other modules.
  • Core data types, such as "Machine", "Instance".
  • Share core logic. For example, grid configuration file parsing/update.
  • Defines the Grid Agent functions (as interfaces), but does not implement them. These are used by all Managers modules.
  • Common utility classes.
  • Common exceptions.

• Web Manager module: A JEE Web application that includes:
  • Includes a simple Managing web GUI: web pages, navigation logic.
  • Uses the Core module for functions such as:
    • Load Grid Configuration,
    • Interact with grid agents.
• CLI Manager module: A java command-line program:
  • Command-line interface: command parsing, text output.
  • Uses the Core module for functions such as:
    • Load Grid Configuration,
    • Interact with grid agents.
• Any other Manager module: Any future module that needs to connect to Grid Agents to manage Tomcat instances.

• Grid Agent module: Responds to Managers calls and controls local Tomcat instances.
  • Listen to Manager requests.
  • Implements the Grid Agent interfaces.
  • Includes the high-level interaction with Tomcat intances.
  • Defines and uses the Tomcat Management Primitives (as interfaces), but does not implement them.
  • Receives content (deployables, grid configuration changes) and applies them.
    
• Grid Agent Primitives for Linux:
  • Implements the Tomcat Management Primitives for Linux OS.
    
• Grid Agent Primitives for Windows:
  • Implements the Tomcat Management Primitives for Windows OS.
    
• Grid Agent Primitives for Mac:
  • Implements the Tomcat Management Primitives for Mac OS.
    
• Grid Agent Primitives for Other:
  • Implements the Tomcat Management Primitives for Other OS.
    
    

The executables themselves are comprised of several modules each that are assembled during the build.

• The Grid Web Manager Executable (a WAR) includes:
  • Core module
  • Web Manager module
• The Grid CLI Manager Executable (a JAR) includes:
  • Core module
  • CLI Manager module
• The Grid Agent Executable (a JAR) includes:
  • Core module
  • Grid Agent module
  • Grid Agent Primitives for Linux
  • Grid Agent Primitives for Windows
  • Grid Agent Primitives for Mac
  • Grid Agent Primitives for Other_

Phase 1 - Core Grid Operation

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