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JEE Enterprise Beans (Message-driven Bean (characteristics (execute upon…

- - - - except, has no interface
  - - - container calls
        onMessage()
        
        cast message
        to JMS types
        
        process message
        
        call session bean
        
        call helper methods
        
        store in DB
- - - - tight / loose
        coupling
        
        local for better
        performance
      - component
        distribution
        
        remote if beans
        on diff machines
      - client type
        
        remote for
        application client
  - - - same application as bean
    - - different machine
    - - JAX-WS
      - Stateless Session Beans
  - - - remote
        
        client & bean point to different param objects
      - local
        
        client & bean point to same param object
    - - local
        
        fine-grained
      - remote
        
        course-grained
      - web service
        
        course grained
- - - - container DI
        
        container
        PostConstruct
        
        ready for
        invocation
        
        container
        passivate
        
        from memory
        to 2ndary storage
        
        client
        Remove
        
        PreDestroy
  - - - container DI
        
        PostConstruct
        
        ready for
        invocation
        
        PreDestroy
  - - - container DI
        
        PostConstruct
        
        ready for
        invocation
        
        onMessage()
        
        PreDestroy
- - - - state
        
        1 / each client
      - web service - no
      - conversational state
      - usage
        
        represent interaction between a bean and a specific client session
        
        hold info on client across method invocation
        
        bean mediates between other components, provides simplified view of client
        
        manage workflow of other enterprise beans
    - - state
        
        1 / all clients
      - pooled stateless session beans
      - web service - yes
      - usage
        
        performance
        
        generic tasks for all clients
        
        web serivice
    - - state
        (instance variables)
        
        1 / application
      - web service - yes
      - usage
        
        state across applications
        
        single bean accessed by multiple concurrent threads
        
        startup / shutdown tasks
        
        web service
  - - - ends life after
- - - - manages concurrent
        access to shared objects
  - - - thin clients
      - numerous clients
      - varying clients
- - - - business logic