Agent

Introduction

Agent is an Actor which is used to spawn or kill a component on a machine where it is running.

Currently, it is able to spawn or kill following component

• Sequence Manager
• Sequence Component

Implementation

Agent is an akka actor which spawns or kill a jvm process depending on the message. If actor receives a spawn message(e.g., SpawnSequenceManager etc), it will first check if the given component is already registered. If yes, it replies with a failure response else it tries to spawn the component.

On any spawn message Agent follows following steps:

• Checks if the component is already registered.

  • If yes it returns the Failure response
  • If not then it goes to next step

• It spawns the component by initializing a jvm process.

  • If process is successfully spawned it returns the Spawned response
  • If process fails to spawn, it returns the Failure response

Module (esw-agent-akka)

Implementation of Agent is all distributed within following submodules:

esw-agent-akka-app

In this module, agent actor’s implementation and agent app is present. This module depends on esw-agent-akka-client for the agent actor’s messages and codecs.

esw-agent-akka-client

In this module, agent client and the agent actor messages are present.

AgentClient

Agent client is an actor proxy to the agent actor. It provides the api which internally send the message to the agent actor and returns the responses replied by the agent actor.