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| − | ==Module Information==
| + | [[Media:Exploration_of_the_Darts_dataset_using_statistics.pdf]] |
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| − | ===Module Objectives===
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| − | *How to implement a cloud based storage solution for a company's big data needs
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| − | *The knowledge needed to integrate desktop and web applications to utilize web services and stored data.
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| − | *How cloud based DNS solutions can help to optimize a company's IT infrastructure
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| − | *How cloud based servers and service implementations can be easily deployed for rapid utilisation
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| − | *The steps involved in data exchange between web services and cloud based applications
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| − | ===Resources - References===
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| − | *Programming Amazon EC2, Juirg van Vliet 1st 2011 O’Reilly
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| − | *Google Compute Engine, Marc Cohen 1st 2011 O’Reilly
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| − | *Python for Google App Engine, Massimiliano Pippi 1st 2015 Packet
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| − | *Big Data Fundamentals Concepts, Drivers & Techniques, Thomas Erl, Wajid Khattak, and Paul Buhler, Prentice Hall
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| − | ==Service-Oriented Architecture (SOA)==
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| − | *A service-oriented architecture (SOA) is a style of software design where services are provided to the other components by application components, through a communication protocol over a network.
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| − | *A service is a discrete unit of functionality that can be accessed remotely and acted upon and updated independently, such as retrieving a credit card statement online.
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| − | *SOA provides access to reusable Web services over a TCP/IP network,
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| − | ==XML==
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| − | ==Web service==
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| − | *A software component stored on one computer that can be accessed via method calls by an application (or other software component) on another computer over a network
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| − | *Web services communicate using such technologies as:
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| − | **XML, JSON and HTTP
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| − | **'''Simple Object Access Protocol (SOAP):''' An XML-based protocol that allows web services and clients to communicate in a platform-independent manner
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| − | '''Basic concepts:'''
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| − | *'''Remote machine or server:''' The computer on which a web service resides
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| − | *'''A client application''' that accesses a web service sends a method call over a network to the remote machine, which processes the call and returns a response over the network to the application
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| − | *'''Publishing (deploying) a web service:''' Making a web service available to receive client requests.
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| − | *'''Consuming a web service:''' Using a web service from a client application.
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| − | *In Java, a web service is implemented as a class that resides on a server.
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| − | '''An application that consumes a web service (client) consists needs:'''
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| − | *An object of a '''''proxy class''''' for interacting with the web service.
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| − | *The ''proxy object'' handles the details of communicating with the web service on the client's behalf
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| − | [[File:Interaction_between_a_web_service_client_and_a_web_service.png|709x709px|thumb|center]] | |
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| − | '''JAX-WS:'''
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| − | *The Java API for XML Web Services (JAX-WS) is a Java programming language API for creating web services, particularly SOAP services. JAX-WS is one of the Java XML programming APIs. It is part of the Java EE platform.
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| − | **Requests to and responses from web services are typically transmitted via SOAP.
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| − | **Any client capable of generating and processing SOAP messages can interact with a web service, regardless of the language in which the web service is written.
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| − | ===Creating - Publishing - Testing and Describing a Web Service using NetBeans===
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| − | *In Netbeans, you focus on the logic of the web service and let the IDE handle the web service’s infrastructure
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| − | *'''Example: HugeInteger web service:'''
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| − | **Provide methods that take two "huge integers" (represented as Strings)
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| − | **Can determine their sum, their difference, which is larger, which is smaller or whether the two numbers are equal
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| − | ====Create a Web Service - Locally====
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| − | * We first need to to do some configuration in NetBeans:
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| − | ** Go to /home/hduser/netbeans-8.2/etc/netbeans.conf:
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| − | *** Find the line: ''netbeans_default_options''
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| − | *** If ''-J-Djavax.xml.accessExternalSchema=all'' is not between the quotes then paste it in.
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| − | * If you are deploying to the ''GlassFish'' Server you need to modify the configuration file of the ''GlassFish'' Server (''domain.xml''):
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| − | ** /home/hduser/glassfish-4.1.1/glassfish/domains/domain1/config/domain.xml
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| − | *** Find : <java-config
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| − | *** Check the jvm-options for the following configuration
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| − | *** '''''<jvm-options>-Djavax.xml.accessExternalSchema=all</jvm-options>'''''
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| − | *** It should be there by default, if not paste it in, save file and exit
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| − | *** You can now start Netbeans IDE
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| − | * '''Create a Web Service in NetBeans:'''
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| − | ** Choose File > New Project:
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| − | ** Select Web Application from the Java Web category
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| − | ** Change Project Name: to CalculatorWSApplication
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| − | ** Set the server to GlassFish 4.1.1
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| − | ** Set Java EE Version: Java EE 7 Web
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| − | ** Set Context path: /CalculatorWSApplication
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| − | ** After that you should now have a project created in the Projects view on the left hand side.
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| − | :* '''Creating a WS from a Java Class:'''
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| − | ::* Right-click the CalculatorWSApplication node and choose New > Web Service.
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| − | :::* If the option is not there choose Other > Web Services > Web Service
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| − | ::* Click Next
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| − | ::* Name the web service CalculatorWS and type ''com.hduser.calculator'' in Package. Leave Create Web Service from Scratch selected.
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| − | ::* Select Implement Web Service as a Stateless Session Bean.
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| − | ::* Click Finish. The Projects window displays the structure of the new web service and the source code is shown in the editor area.
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| − | ::* '''Adding an Operation to the WS:'''
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| − | :::* Change to the Design view in the editor.
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| − | :::* Click the Add operation button.
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| − | :::* In the upper part of the Add Operation dialog box, type add in Name and type int in the Return Type drop-down list.
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| − | :::* In the lower part of the Add Operation dialog box, click Add and create a parameter of type int named num_1.
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| − | :::* Click Add again and create a parameter of type int called num_2.
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| − | :::* Click OK at the bottom of the panel to add the operation.
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| − | :::* Remove the default hello operation.
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| − | :::* Right click on hello operation and choose: Remove Operation
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| − | :::* Click on the source view to go back to view the code in the editor.
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| − | :::* You will see the default hello code is gone and the new add method is now there instead.
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| − | :::* Alter the code to now look like this.
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| − | :::* Well done, you have just created your first Web Service.
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| − | :::* To test the Web service drop down the Web Services directory and right click on CalculatorWSApplication.
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| − | :::* Choose Test Web service.
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| − | :::* Netbeans throws an error: It is letting us know that we have not deployed our Web Service.
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| − | :::* '''Right click on the main Project node and select deploy'''
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| − | ::* '''Testing the WS:'''
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| − | :::* Deploying the Web Service will automatically start the GlassFish server. Allow the server to start, this will take a little while. You can check the progress by clicking on the GlassFish tab at the bottom of the IDE.
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| − | :::* Wait until you see: «CalculatorWSApplication was successfully deployed in 9,912 milliseconds»
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| − | :::* Now you can right click on the Web Service as before and choose Test Web Service.
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| − | :::* The browser will open and you can now test the Web service and view the WSDL file.
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| − | Type 5 and 5 into the input fields and check that you get the response.
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| − | ==Consuming a Web Service in Java using NetBeans IDE==
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| − | Netbeans 6.5 - 9 and Java EE enable programmers to "publish (deploy)" and/or "consume (client request)" web services
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| − | This document provides step-by-step instructions to consume a web service in Java using NetBeans IDE.
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| − | In the project, we will invoke a sorting web service through its WSDL link: http://vhost3.cs.rit.edu/SortServ/Service.svc?singleWsdl
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| − | * '''Step 1 - Createa JavaProject:'''
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| − | ** We are going to name it: SortClient
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| − | * '''Step 2 - Generate a Web Service Client:'''
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| − | ** After the Java Project has been created, go to the Project Tree Structure, Right click on Project and select New and then choose Web Service Client.
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| − | ** Specify the WSDL URL as: http://vhost3.cs.rit.edu/SortServ/Service.svc?singleWsdl
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| − | ** Click Finish
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| − | * '''Step 3 - Invoke the Service:'''
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| − | ** Expand the Web Service References until you see the operation lists. Drag the operation you want to invoke to the source code window, such as "GetKey". A piece of code is automatically generated to invoke that operation.
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| − | ** Drag MergeSort to the source code window and the corresponding code is automatically generated,too.
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| − | ** In the main function, add the code to call the two functions: getKey() and mergeSort();As it is a call to a remote service, RemoteException needs to be listed in the throws cause
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