MIDDLEWARE

 A software that connects software components or applications.It have a set of services   that  allows multiple processes running on one or more machines to interact.It is integral  to modern technology based on XML,SOAP,web services and service  oriented architecture.  

A typical example is the TCP/IP tack for telecommunications,nowadays included virtually in every operating system.

Types of Middleware

It is based on scalibility and recoverablity.

1.Remote procedure call:

         Client makes calls to procedures running on remote systems.It can be synchronous or asynchronous. 

2.Message oriented middleware:

             Messages sent to the client are collected and stored until they are acted upon , while the client continue with other processing .

3.Object request broker:

             It makes possible for applications to send to send objects and requests services in an aobect oriented system.

4. SQL oriented data access:

              Middleware between between applications and database servers.  

5.Embedded middleware:

         Communication services and integration interface software or firmware that operates between embedded applications and the real time OS.

6.Transaction processing monitors:

          Provides tools and environment to develop and deploy distributed applications.

7.Application servers:

           Software installed on computer to facilitate the running of other applications.

8.Enterprise service bus:

            An abstraction layers on top of an enterprise messaging system.