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Communication Middleware, Service Oriented Architectures and Cloud…

- - - - Expertise in transport protocosls (TCP,UDP and others)
      - Creating network packages
      - Considering aspects as: Security, Mobility, Performance
  - - - RPC implementations are based on the synchronous request-reply pattern that blocks the client until the server replies to RPC call.
    - - Object Oriented paradigm . It allows the communication with remote objects, by implementing interoperable object reference. It is in charge of remote , destruction, location, invocation and destruction of objects
    - - The MOM are based on the concepts of messages and queues
        
        Messages contain network routing information and the payload allowing communication (request, response, transactions, etc)
        
        Queues represent mediators assuring asynchronous communication even when remote parts or partners are not on-line or avaiable
- - - - Service Consumer
        
        Element that consume the service offered by a service provider
      - Provider
        
        Offers a specific serfice or functionality
    - - Service contract
        
        formal or informal specification of the service including the purpose, functionalities,
        constraints and usage
      - Service Interface
        
        specifies how the service can be accessed, including data format and operations
      - Service implementation
        
        physical implementation of the service providing the required capability or business
        logic
      - Service repository
        
        provides the required facilities to discover and use services
      - Service Bus
        
        provides the required connectivity between the service participants
    - - SOA applications are naturally designed and developed as assemblies of interconnected and distributed
        components.Based on distributed, reusable, autonomous and stateless services, new composite
        services can be developed as the result of business process orchestrations
        
        Application Server Based AS
        
        An AS is classified as a middleware mediator as it provides services containers performing as runtime
        environments for hosting and running software components
        
        Message Oriented Middleware based
        
        As previously introduced, a MOM is a middleware based on message and channel message concepts and
        offering asynchronous communication between message producers and consumers
        
        Enterprise Application Integration based
        
        Can be used as middleware mediator by implementing the required
        adapters between consumers and providers based on integration patterns
        
        Enterprise Service Bus
        
        Offers middleware technologies, that enable interoperability and allow integrate heterogenous applications using standard-based interfaces, services, and a flexible communication schema
        
        Middleware solution that enables integration among heterogeneous components within Service Oriented Architectures
        
        ESB increases availability, reliability, performance and scalability and facilitates maintenance
        
        Java Business Integration
        
        Is defined as a set of plug and play Web Services components that communicate asynchronously via a Normalized Message Router.
        
        External components can becom providers or consumers connected to the JBI container via the binding Components
        
        Binding Component
        
        Entities that are able to provide transport protocol independency to allow communication between JBI components and other protocol-dependent components
- - - - Event
      - Event Producer
      - Event Consumer
      - Event Channel
      - Event processing
      - Queue-based
      - Topic-Based
  - - - Is a combination of the paradigm of SOA with the model of EDA that allows SOA-based systems being more interoperable in real time and in asynchronous way.
      - Request/ response messages and publish / subscribe events can be exchanged between distributed and heterogeneous components.
  - - - Applications
        
        Software as a Services
        
        Provides to cloud consumer applications / or software command line console.
        
        Platform as a Service
        
        Provide platforms that allows cloud users to develope, deploy and host their own applications
        
        Infrastructure as a Service
        
        Consists in providing to cloud consumers infrastructural resources (storage, computing,network) usable for deploying and running their own platforms,applications and software.
      - Key Concepts
        
        The ability to virtualize all resources (Infrastructure, platform,application)
        
        The automation that allow supportin all the clouds operations in an efficient and scalable way with the minimum human intervention
      - Characteristics
        
        On-demand self-service
        
        Broad network acess
        
        Resource pooling
        
        Rapid elasticity
        
        Measured Service