Published on February 16, 2014
Enterprise Integration and Spring broad adoption on EI Chamantha De Silva Senior Software Engineer, Leapset Inc.
Topics in this session Introduction Integration Styles File Transfer Shared Databases Remoting Messaging For Each Style Pros/Cons of each style Where Spring comes to play Our Concerns on Integration styles Based on requirement Based on trend
Hypothetical scenario…. An example to illustrate how this enterprise integration space evolved ABC Entertainment is a shopping and hotel Complex, which is a large entertainment precinct located on US. It was started early 1970s and became one of the busiest hospitality destinations with large number of transactions per day Why hospitality industry to illustrate All of these trends adopted by almost of all of industries; but with hospitality industry... Easy to explain Also its a predominant industry and an industry helped IT space to grow exponentially after Space programs and Banks
File Transfer Appeared ~1970s Export data as files Export data with bunch of information at once
File Transfer :Pros and Cons Pros Cons Its Simple : has simple formats such as CSV, XML, Cobol flat files etc. Not real time : Data transfer is not immediate. Systems can be out of sync most of the time Interoperable : does not contain language dependent information nor system dependent Processing is Bulky :Large amounts of data needs to process at a time, concurrent issues may occur. Easy : Most of the time it is simple parsing of one type of object Not transactional : if something has gone wrong there is no way it can un done
File transfer : Spring support Spring batch A lightweight, comprehensive batch framework designed to enable the development of robust batch applications vital for the daily operations of enterprise systems.
Shared Database Appeared ~1980s Two or more applications access the common database
Shared Database :Pros and Cons Pros Transactional : if something has gone wrong things will be rollbacked (All or nothing...) Real time : Data is consistent and data is real time data Easy : Retrieving or adding data is simple if the system follows/knows the schema Cons Changing is difficult : If we want to change the database schema, changes needs to apply across all systems otherwise systems will breaks Performance issues :Since database/table/row/cell is locked by a system other system might have waiting times
Shared Database : Spring support Spring JDBC template DataAccessException Hierarchy Spring provides transaction management in a transparent way...
Remoting Appeared ~1990s One system calls another to perform a function in a responsive way Invoking a function rather than directly engaging with data Good old days : number of Remote Procedure Call (RPC) approaches: CORBA, COM, .NET Remoting, Java RMI, etc
Remoting :Pros and Cons based on Remote Procedure Call (RPC) approaches: CORBA, COM, .NET Remoting, Java RMI, Hessian etc. Pros Cons Real time : function invocation happens at real time. Non interoperable : language dependent/protocol dependent developer friendly: Functions can be invoke in OO fashion Hidden complexity : even though functions stick with OO paradigm, complexity is high when it comes to handling exceptional situations Performance issues : since most of these RPC approaches are not scalable has limitations when scaling
Remoting : Spring support Spring RMI, Hessian /Burlap Spring provides Service exporters to transparently expose services through RMI, Hessian/Burlap infrastructure easily ProxyFactoryBeans to communicate with service exporters from client side
Messaging Appeared ~2000s Asynchronous messaging is the key introduction in this decade and it still exists Separation of systems were introduced via middleware Both systems doesn’t need to be up and ready at the same time But what about synchronous messaging : web services comes under this? Yes it is Contact 1st SOAP became trend, but then REST is the trend…on this categorization
Asynchronous Messaging:Pros and Cons Via channels Pros Scalable : Systems are not coupled since interaction happens between Message Oriented Middleware Asynchronous: fire and forget message will some how deliver the other system, since its taken care by Message Oriented Middleware Efficient : Since system is asynchronous more number of requests can be served Cons Not Real time : might take a long time to response Hidden complexity : complexity is high since message oriented middleware architecture has taken in to play Context is distributed : Transaction, security is not in the same context need one more level of extra handling
Synchronous Messaging :Pros and Cons with SOAP and REST Pros Real time : function invocation happens at real time. Interoperable : does not contain language/protocol dependent information Easy/Less complex : easy for developers, less complex to handle exceptional situations compare to previous generation of RPC and even easier than asynchronous messaging Cons Spec Dependent : does not have any standardized mechanism for dynamic discovery of the services. Changes will be hard : since its spec dependent, some of changes might break existing clients
Asynchronous Messaging : Spring support Spring JMS JMS integration framework simplifies the use of the JMS API. its more like Spring JDBC template Spring AMQP provides a "template" same as Spring jdbc template with a high-level abstraction for sending and receiving messages. Spring Integration Provides lightweight messaging within Spring-based applications and supports integration with external systems via declarative adapters. Spring has extended its programming model to support the well-known Enterprise Integration Patterns.
Synchronous Messaging : Spring support Spring REST Spring's annotation-based MVC framework serves as the basis for creating RESTful Web Services. configure servlet contaiIner for a Spring MVC application using Spring' is all you need to do In other hand at client end can use Spring's RestTemplate which is a robust and easy to use Spring SOAP Focused to facilitate contract-first SOAP service development, allowing for the creation of flexible web services using one of the many ways to manipulate XML payloads. SOAP endpoints are similar to MVC endpoints Spring-WS provides a client-side Web service API that allows for consistent, XMLdriven access to Web services
Our Concerns on Integration styles Where are we fit into ? Best of synchronous and asynchronous messaging ... RESTful Web services for synchronous Middleware Oriented Messaging for asynchronous messaging ...
Introduction to RESTful Web services REST stands for REpresentational State Transfer Its a simple stateless architecture that generally runs over HTTP ... Not a standard but has some de facto features Spec based interfacing Not tied to HTTP but associated mostly with HTTP
HTTP based REST.. - de facto Request URI to identify resources Make use of HTTP methods so we can manipulate the ame resource different aspects ... POST PUT GET DELETE HTTP headers will be meta data that describes the message
POST HTTP 1.1 spec says ... The POST method is used to request that the origin server, accept the entity enclosed in the request as a new subordinate of the resource identified by the Request-URI in the Request-Line... In other words, POST is used to create
PUT HTTP 1.1 spec says ... The PUT method requests that the enclosed entity be stored under the supplied Request-URI. If the Request-URI refers to an already existing resource, the enclosed entity SHOULD be considered as a modified version of the one residing on the origin server. If the Request-URI does not point to an existing resource, and that URI is capable of being defined as a new resource by the requesting user agent, the origin server can create the resource with that URI... In other words, PUT is used to update the existing resource and if resource does not exists create it.
GET HTTP 1.1 spec says ... The GET method means retrieve whatever information (in the form of an entity) is identified by the Request-URI... In other words, Retrieve information Must be safe and idempotent
DELETE HTTP 1.1 spec says ... The DELETE method requests that the origin server delete the resource identified by the Request-URI. This method MAY be overridden by human intervention on the origin server. The client cannot be guaranteed that the operation has been carried out... In other words, Delete the resource Does not need to be deleted at real time
Demo... Back end needs so support REST…. Create Customer Get Customer Update Customer Delete Customer
Introduction to Messaging with RabbitMQ RabbitMQ is a message broker based on AMQP protocol Message broker and their roles Message brokers receive messages from publishers and route them to consumers Since AMQP is a network protocol, the publishers, consumers and the broker can all reside on different machines AMQP is also an open protocol, so systems which is based on different languages/platforms can communicate easily
Producer and consumer via RabbitMQ image credits : http://www.rabbitmq.com/img/tutorials/intro/hello-world-example-routing.png
Demo…. Create a message receiver Create a message consumer Communicate
Messaging via Messaging Bus based on EIP Spring has introduced Spring integration to adopt EIP Spring integration provides all most all features of an Enterprise Service Bus but its more of an embedded component rather than an different middleware system Will be a separate presentation...
Questions and Answers
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