WebServices Notes by Sekhar Sir JavabynataraJ
February 18, 2017 | Author: sri543 | Category: N/A
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Web Services
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WEB-SERVICES [Intro)
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By Mr. SekharReddy i; . ,
Q.) What is distributed technology? I
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A technology is said t o be distributed if it's business objects are geographically dispersed (across multiple JVM's) and st111communicating one another.
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Q.) Why distributed technology? I-)
Load balancing
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High Availability
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High Processing
Q.) What are different distributed technologies?
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> There are so many distributed technologies o
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CORBA RMI EJB WEB SERVICES ...etc. .&
CORBA > More complexity in t h e implementation I-> Heavy weight Language dependent > Commercial :, Plat from independent I
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RMI > Lack of Enterprise services/Middle ware services I
Open source IVo acknowledgement > Language dependent > Plat from independent
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Supports Enterprise services/Middle ware services in the declarative manner Having multiple flavors of APIs t o handle different requirements o Session beans Stateless Stateful o Entity beans(not using now) = JPA o Message Driven Beans
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Naresh i Technologies, Opp. Satyam Theatre, Ameerpet, Hyderabad, Ph: 040-23746666,23734842 An IS0 9001 : 2000 Certified Company - .-.. . . ... ...- - ........ ... - - . .- .- - -.-.... ..- - - - -- ..-,
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By Mr. ~ e k h a r ~ e d d v
WEB-SERVICES (Intro) I
> Managed by Application server
Robust Heavy weight c> Language Dependent G Plat from independent I
WEB SERVICES
Supports Enterprise services > Interoperable (Language independent & Plat from independent)
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So, Web services is interoperable distributed technology
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Q.) What we require if two persons need to communicate?
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1 .) Two persons @ 2.) Medium 3.) Language 4.) RuIes(protocoI)
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Web services architecture I f two applications needs to communicate
a Both the applications should be connected (network)
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Both application needs to communicate by following some rules(protocols) o HrrP o FTP o SMTP...etc. To communicate language is required(Neutra1 language) o XML
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~ a G s ihTechnologies, Opp. Satyam Theatre, Arneerpet, Hyderabad, Ph: 040-23746666,23734842 An I S 0 9001 : 2000 Certified Company .... .. . .. .-. .-- -- ---
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WEB-SERVICES (Introl
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SMTP
I n the internet world we prefer t o use H-TTP protocol, and we have so many technologies which supports HlTP protocol. I
> Lets assume that we are sending employee information form "Consumer" to "Provider" in
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the XML format as follows.
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ysreddy+.-..** * * * * JAX-RPC, Contract first approach 3 JAX-RPC , Contract last approach
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NOTE: I n the internet world w& prefer to use HlTP protocol, and we have so many technologies which supports HlTP protocol.
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Q.) What are the HTTP protocols implemented API's?
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1. Servlet API 2. EJB API
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Naresh i Technologies, opp.Satyarn Theatre, Ameerpet, Hyderabad, Ph: 040-23746666,23734842 An IS0 9001 : 2000-. Certified Company ......................... .-....... --
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WEB-SERVICES (lntro'l--'
Q.) W h a t i s e n d p o i n t ? 1
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A component which receives "Consumer" request I n general we use either servlet or ejb as an End Po~nt.
So, we can say we are developing web services using > JAX-RPC, Servlet end point url, Contract first approach > JAX-RPC, EJB end point url, Contract last approach I 1
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i MEP 1 1
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MEP stands for ~ e s s a g d ~ x c h a n g i nPatterns g " C o n s ~ ~ r n can e r ~ ~communicate with "Provider" in three ways o Synchronous request-reply o Asynchronous request-reply o Fire and forget
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Synchronous request-reply 0 I n this "Consumer" sends the request t o "Provider", and "Consumer" blocks until response comes back from the "Provider", Until response comes back "Consumer" can't proceed.
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After Response Received, c o n t i n u e s i t s process
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A s v n c h r o n o u s reauest-re~ly
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e In this "Consumer" sends the.request t o "Provider", and "Consumer" will not wait until it I > I
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gets the response. After request sent t o the "Provider" it continues its flow of execution "Consumer" will have " R e s p o n s e L i s t e n e r " which listens t h e response from the "Provider".
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Naresh i Technologies, Opp. Satyam Theatre, Ameerpet, Hyderabad, Ph: 040-23746666,23734842 An I S 0 9001 : 2000 Certified Company -
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