Essential plugin summary

Tables , and provide a useful quick guide to help you decide what plugins to look in depending what you want to do. The rest of this chapter fills in the details.

Table: Actions associated with managers.

What do you want to do?	Where to look/how to do it
Application start and stop
Cold-start the application.	IManagerLifeCycle
Warm-start (after failure).	IManagerLifeCycle
Act when this netlet is a new manager joining the existing ones.	IManagerLifeCycle
React when the leader changes.	IManagerLifeCycle
Controlling warm-start and join parameters.	ILeaderSupport
Set the number of managers.	ILeaderSupport
Close down the application.	IManagerLifeCycle
Leadership
Check if I'm the leader	ILeaderSupport
Find the current leader	IPeerSupport
Comms between managers
Use a storage space visible to all managers.	Use the management MIB, with   IManagementState.
Write to the management MIB.	Use IManagementState, but only the leader can do this. For complex changes use the  applyChange() method.
Read the management MIB.	Use IManagementState; any manager can do this.

Table: Worker-related actions.

What do you want to do?	Where to look/how to do it
Organise workers
Create a group of workers to perform a type of service.	Use a worker pool, managed from a manager netlet.
Create a worker pool.	Add a WorkerPool plugin to a manager and set the worker pool's parameters.
Set what resources are required for workers.	Add an IWorkerResourceRequester plugin to a worker pool.
Respond to workers starting and stopping.	Add an IWorkerLifeCycle plugin to a worker pool
Start a worker.	You don't. Workers are started automatically by the worker pool plugin. However, you can increase the number of workers generally by setting the worker redundancy range with IWorkerPool.
Stop a worker.	You don't. Workers are stopped automatically by the worker pool plugin. However, you can deccrease the number of workers generally by setting the worker redundancy range with IWorkerPool.
Make a worker functional.	Given a basic default Worker (1) get its IRemotePluginManager, (2) add plugins as needed.
Let a manager find workers, possibly just those who offer a specific service type.	IManagerSupport

Table: General Beatrix actions.

What do you want to do?	Where to look/how to do it
Comms within the application
Get handles to other netlets in the same application.	IPeerSupport
Set a status message	IPeerSupport
Talk to another netlet in the same application.	Make an interface available as an internal facet. (1) Implement IInternalFacetProvider, (2) plug in the implementation, (3) get it remotely using a netlet handle.
Use internal facets more efficiently	IInternalFacetCache
Listen for when a connection to a client is cut.	Implement ICommunicationServer.
Services
Make a simple service available.	(1) Plug in a ServiceManager, (2) implement an ISimpleServiceProvider, (3) plug the service provider into the service manager.
Make a more complex service available.	As above, but implement an IServiceProvider.
Create a client service session.	IPeerSupport
Create a warrant for anyone: the administrator or a consumer.	IManagerSupport
Sign a warrant.	Provide a key pair when you make the application. All warrants will automatically be signed.
Tell workers how to load balance themselves for different services.	IManagerSupport
Control a netlet's local environment
Netlet wants node to terminate it.	IPeerSupport
Get netlet's current node.	IPeerSupport