Java J2ee Planet

REST, RPC - architecture patterns, AMQP - wire-level and HTTP - application protocol which run on top of TCP/IP AMQP is a specific protocol when HTTP - general-purpose protocol, thus, HTTP has damn high overhead comparing to AMQP AMQP nature is asynchronous where HTTP nature is synchronous Both REST and RPC use data serialization, which format is up to you and it depends of infrastructure. If you are using python everywhere I think you can use python native serialization -   pickle   which should be faster than JSON or any other formats. Both HTTP+REST and AMQP+RPC can run in heterogeneous and/or distributed environment So if you are choosing what to use:  HTTP+REST or AMQP+RPC, the answer is really subject of infrastructure complexity and resource usage. Without any specific requirements both solution will work fine, but i would rather make some abstraction to be able switch between them transparently.

SOA offers a change in perspective, a paradigm shift from object oriented to service oriented.As for almost a decade, most of the development is done using Object oriented technologies and that led to tight coupling many a times with vendor specific technologies like CORBA,DCOM or RMI.SOA offers to a new thinking of services rather visualizing in terms of objects which makes it independent of underlying technology. If SOA implementation in an organization is not well thought of,planned and micro-detailed then it may lead to disaster, waste of valuable resources of time and money.SOA may not be a good idea for enterprises which are not too big and complex in their business process and do not depend upon business processes of its suppliers and business partners. For instance, if an organisation which has distributed applications across the differ net geographies then it will be a good idea to implement SOA to integrate various applications to provide one cost effective,scalable an...

With all the hype that SOA has brought to organizations, they have to brainstorm whether this will do any good to their business anyway.The organizations first have to understand that SOA can not be implemented by introduction of certain software products or services but it is an architectural approach which has to analyze existing systems,IT resources,ever changing business processes and requirements and comes up with a set of business aligned services which can cost effectively fit very well for a consistent business functioning for years to come. As discussed in my previous blog , SOA projects can easily be put into red zone if all its constituents are not well planned,managed and executed.A change is like oxygen for an organization and SOA has to help businesses adapt with changing times and technology too changes rapidly beyond our imagination and in these times keeping an IT plan for next ten years for an organization is a daunting task.No matter how smart we think SOA can ta...

It is very important to know your customer's requirements,expectations and improved business processes in advance before starting any analysis and design exercise. A continuous communication with your client is must so that you can understand their business processes very well and should be able to identify problem areas with some concrete solutions in mind. If you have a suggestions related to business processes improvement then get an approval from your client on business requirements as they keep changing all the time.So scope of work is clearly defined to you and your customer with extensive project planning. If a customer does not see any qualitative improvement in complex business processes simplification/replacement with new improved business processes,he is going to make a lot of hue and cry about introducing new technological architecture. An organisation is always interested in synchronisation and improvement of its business process with its customers,suppliers and ...

What is a naming service? Naming services map objects with names. It maps a reference to an object by a user friendly name. For example a machine maps its ip address. The association of an object with a name is called 'binding'. Examples : Domain Naming Service, File systems. What is a directory service? Searching for files and directories done by providing Directory services. A directory service is a set of names. The user and resource information and machine addresses are summarized by directory service. For example, for a given user name, the service returns the attributes of the user such as telephone no, email address etc. A directory service use the databases that specialized and hierarchical in design.

What are web services? A web service is a business function that is self-contained and operates over the internet. The W3C defined web service as "a software system designed to support interoperable machine-to-machine interaction over a network". XML is the base for the web services. They communicate using open protocols. Web services are more frequently like Web APIs. These services accessibility can be from internet. A remote system can host these services for different web services. A web service can convert a stand alone / desktop application into a web based / web application. A web services are published or found and utilized through the internet. The web services works on the XML + HTTP platform. Explain each web service technologies - SOAP, WSDL, UDDI, eBXML and JAX pack.

As I have discussed earlier, analysis and design part of SOA centers around three approaches SOAD,SOMA and BDD.If you want to recap these concepts then read my blog 'Constituents of SOA'. In this post, my focus will be to develop SOA using web services.I will talk about webservices in its underlying technologies and in next post, how Apache Axis works to create web services over SOAP and several tools to test webservices.I will take a step-by-step approach for creating one simple web service using Apache Axis meant for Java. Apache Axis also supports C++.The web service example mentioned in this blog requires fair knowledge of Java for its audiences to put this knowledge into practise.

A Service in an SOA meets the following criteria: ·                             Multiple-use ·                             Non-context-specific ·                             Composable with other components ·                             Encapsulated i.e., non-investigable through its interfaces ·                          ...

The IT infrastructure which includes various business critical systems of an enterprise are built over a long period of time.They cannot always be made with latest technologies as their is already investment being made in earlier systems.The organizations which breathe change like oxygen have to think new ways in order to integrate all its existing systems,new or legacy, in order to orchestrate its business process with its partners,suppliers and customers.The IT strategies of organizations change with mergers and acquisitions and leads to more vendor or application specific systems, sometimes repeat of an application by different vendor, in such a scenario whole IT landscape of an organization becomes quite complex.

With advent of IT revolution, it is information that people want and technology is a mean to supply it and with time it is provided at lower costs.So keeping the costs continuously low is a challenge.These days business houses have huge dependency on IT and it cannot be wiped out completely.It makes great business sense to save costs that incur on big investments that these organizations do on IT infrastructure for running their complex business processes. The existing systems in an organization are rarely thrown away and they are valuable asset for enterprise from business point of view.SOA leverages the benefits of integrating new systems with old legacy ones.It is instrumental in linking IT resources and put them to reuse.The cost effectiveness of this style of architecture focuses on services rather on objects.The similar concepts have always been around like Java Connector Architecture propounds the same concepts so SOA is a kind of evolution of existing set of knowledge mainly...

SOA has become a de-facto standard for system development and integration of new with existing legacy solutions running and supporting complex business processes. SOA, as IT world has always a fancy term for any new technology,elaborates to Serivce Oriented Architecture, is not a new term and has been around with emergence of webservices. In order to understand SOA, we must first understand what a   webservice   means, which is sometimes referred as crux of SOA,not always though.A system does not necessarily need to use web services and all related standards to be "service-oriented." For example, some service oriented systems have been implemented using Corba,DCOM,RPC, Jini and REST.A webservice is defined by a set of processes over a network which is a manifestation of some physical entities like databases,devices,programs.