Think about banking
system. In early days, banking system is a single application which
handles all the authentication, transformation, data storage and any
other methods it needs. After increase usage of information system,
try to differentiate different features into different modules which
serve to create a single system. For example, In Bank Fixed deposit,
transaction, database application. So the entire system is divided
into separate modules. And each modules is connected with each other.
When connecting these different system to each other, it is hard to
maintain if the users increases. In case users increase, we need lot
of servers to store the data. Then all these servers need to
connect to each other system as well. Complexity will increase. And
also when Fixed deposit system connect to transaction system they
need to know the protocol they are using. Like that each system need
to maintain every protocols to connect each other...
Consider a sample
system it has different modules which has been written different
languages and technologies. It has .net , J2EE, SOAP, REST different
kind of modules. When try to connect these system, hard to maintain,
when one system has issue then it will affect the all other systems,
scalability problem, troubleshooting problem.
So… ESB act as
central application which connect all the other systems. Then .net ,
J2EE, SOAP, REST are connected to ESB so that they can talk to each
other.
In ESB, consider JMS
client application, HTTP system, JSON, SAP are connected through the
ESB. When HTTP calling JMS service, It only needs to know HTTP
protocol not need to know JMS protocol then HTTP connect to the ESB
and ESB connect JMS system through JMS protocol.
So here to connect
with different system only need to know the protocol they are using.
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