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Communication Middleware, Service Oriented Architectures and Cloud…

- - - - Synchronously
        
        Requires an “always-available” server
        
        Follows request/reply pattern
        
        Obtain immediate responses of the
        communication partner
      - Asynchronously:
        
        request/reply pattern is not applied
        
        It is not expected that the server or remote partner must be “always available”
  - - - Providing uniform-standard interfaces
      - Providing reusable components/services
      - Hiding heterogeneity
      - Hiding distribution
  - - - client/server model
      - multi-tiered model
    - - message-oriented paradigm
      - event-driven paradigm
      - object-oriented paradigm
      - resource-oriented paradigm
      - procedure-oriented paradigm
      - component-oriented paradigm
      - service-oriented paradigm
  - - - Based on inter-process communication
      - Allows an application to execute a procedure or operation offered by a remote system
      - RPC implementations are based on the synchronous request-reply pattern that
      - Blocks the client until
        the server replies to RPC call
    - - Allows the communication with remote objects while hiding networking mechanisms
      - Communications are synchronous
      - Requests go through the ORB over the network
      - Performance can be affected by the broker usage
      - At the client side a proxy allows accessing the object methods by implementing the required networking-oriented operations
    - - A distributed system can be split in several tiers or components
      - Client side (client-tier), server side (presentation-tier), the application logic (business-tier) and enterprise information system (EIS-tier)
      - This model allows a better distribution of components
    - - Offers asynchronous communication between distributed applications
      - Based on the concepts of messages and queues
      - Messages contain network routing information and the payload allowing communication
      - Queues represent mediators assuring asynchronous communication
    - - Client and server interconnected via the
        network
      - Clients are highly dependent of the server location, implementation language, state and availability
      - Important number of demands, processing, memory or networking resources limits can be encountered
      - Performance and reliability of the distributed system can get compromised
- - - - Consists in providing to cloud consumers platforms that allows them developing, deploying and hosting their own applications and software
    - - Consists in providing to cloud consumers infrastructural resources (storage, computing, network) usable for deploying and running their own platforms, applications and software
    - - Consists in providing to cloud consumers applications and / or software to process business functions
  - - - A cloud provider applies multi-tenant models to pool its resources to serve multiple cloud consumers
      - This operation allows providers using better their resources and need to be transparent for consumer
    - - A consumer can access to the services at any time, as they have an unlimited capacity
      - At the provider side, this requires an adaptation of the underlying resources and a dynamic allocation according to the load and the number of consumers
    - - A cloud consumer can access to providers’ resources and services using any kind of devices connected to the Internet.
      - Smartphone, tablets, laptops, etc.
    - - storage, processing, bandwidth, and active user accounts
      - Resource usage can be monitored, controlled, and reported, providing transparency for both the provider and consumer of the used service
      - Cloud systems automatically control and optimize resource usage by leveraging a metering capability at some level of abstraction appropriate to the type of service
    - - This offers more agility to cloud
        user
      - A cloud consumer can provision, use and release resources based on its needs and these operations don’t require intervention at the provider side
- - - - Integrability
      - Interoperability,
      - Extensibility
      - Availability
      - Proactivity