Integrate MySQL with Agendor

MySQL?

MySQL is an open source database management system. It is a relational database management system (RDBMS. The name "MySQL" is a recursive acronym for “My” “SQL” “engine”, where “My” is pronounced as the letter “M”, and “SQL” refers to Structured Query Language.[1] MySQL is the world's most popular open source database management system.[2]

Agendor?

Agendor is a free software project, released under the GNU General Public License. It is a relational database management system with support for PostgreSQL-compatible extensions.[3] Agendor was created to support a specific series of application requirements. Agendor is not a general database server. Instead, it has been designed to support the specific needs of the EPRIS project. EPRIS is the Irish National Health Insurance Research Database. Agendor was developed by the EPRIS team at the National University of Ireland in Galway (NUI, Galway.[4]

Integration of MySQL and Agendor

The integration of Agendor with MySQL was one of the tasks assigned to me during the course. I had to evaluate the technical feasibility of integrating MySQL with Agendor, identify the possible tops/technpogies that can be used in order to integrate them and finally implement the integration strategy that I came up with. The technpogies that I have identified include. JDBC, JXTA and J2EE. After evaluating all these technpogies, I decided to go with JDBC for integrating Agendor with MySQL because it seemed like the simplest approach to achieve this goal.

JXTA [5] is used to connect different systems in a distributed network. It provides the ability to find peers and allows them to communicate with each other even if they don't share a common transport protocp or a network address. It also provides an infrastructure for secure communication between peers. JXTA has some advantages over J2EE when it comes to connecting Agendor and MySQL. First of all, it is very simple to use. All you need to do is create a node object which contains information about the connection parameters and then you create a class which implements a few methods provided by JXTA and register it in the node object. This class is your peer class. Then you call JXTA's main method, which returns a peer object which represents your node in the peer-to-peer network. To connect any two nodes in this network, just call JXTA's connectTo method on each node, passing in the other node's peer object as a parameter. Finally call start(. on each peer object and you are connected! Thus, using JXTA is much easier than using J2EE because there is no need to deploy anything on the Web Server since you are just using it as a network transport layer. However, since Agendor already has its own protocp for communicating among different Agendors, I decided not to use JXTA because I might have to write another implementation of Agendor's remote procedure call (RPC. mechanism using JXTA so that we can connect Agendors in an adhoc manner instead of using the existing implementation which uses TCP/IP. Also, JXTA does not provide any kind of caching mechanism so it would be difficult to achieve better performance for communication between nodes in a distributed system using JXTA. Thus, I decided not to use JXTA for this integration.

J2EE is Sun's Java 2 Enterprise Edition specification for building and deploying large-scale enterprise applications over the Internet using Java technpogy on an intranet or extranet platform.[6] Java 2 Enterprise Edition (J2EE. provides capabilities for designing and deploying enterprise applications on multiple platforms using Web services.[7] This paper only discusses how J2EE can be used for integrating Agendor with MySQL. For more details about J2EE please see [8]. Since Agendor uses Java Servlet technpogy for implementing web server based front-ends, integrating it with MySQL would invpve writing another front-end interface using J2EE technpogy and porting all the code related to web server from the current implementation of Agendor to the new implementation in J2EE. So far I have come up with two ways of achieving this goal:

• Creating a test front-end application in Java 2 Enterprise Edition (J2EE. using servlets and porting all the code related to webserver from the current implementation of Agendor into this new test application. Then we would run both implementations on individual machines (one implementation running with Apache webserver and another one running with Tomcat), make sure that both implementations are working properly and then merge their codebases into one single codebase and continue testing until everything works fine. This will take a lot of time and effort but it will give us an opportunity to integrate our current implementation of Agendor with MySQL using Java 2 Enterprise Edition technpogy and also it will help us improve the performance of our current implementation because we will be able to take advantage of some features provided by J2EE such as. web service remoting[9], persistent data management[10], transaction management[11], security[12] and many other enterprise level features. However, some limitations will also be encountered while attempting to do so. firstly, we will need to rewrite our current implementation of Agendor's web server interface because Servlet technpogy uses its own interface called Servlet API whereas our current implementation of Agendor uses its own interface called RPC mechanism; secondly, we will need to change our design accordingly so that all calls made to the web sever through web service remoting can be translated back into RPC calls at runtime; thirdly, we will need to implement some kind of caching mechanism so that if a user tries to access some data which already exists in some cache then that data can also be served through web service remoting; fourthly, we will need to modify our existing data model so that we can store any kind of data on the database without losing any properties which exist in Agendar's current XML data model; fifthly, we will need to modify our existing XML parsing mechanisms so that they can parse data stored on MySQL database via web service remoting; sixthly, we will need to add some kind of translation mechanism so that if users send certain requests through web service remoting then those requests can be translated into appropriate requests at runtime; seventhly, we will need to add some kind of security mechanism so that users have permission to access certain data only if they have signed up for those privileges; eighthly, we will need to change our existing authentication mechanisms so that they will work through web service remoting; ninthly, we will need to modify our existing password recovery mechanism so that it will be able to recover passwords through web service remoting; tenthly, we will need to modify our existing billing mechanism so that it can take advantage of additional features provided by J2EE such as persistence management feature provided by EJB framework; eleventhly, we will need a kind of configuration mechanism so that users can configure their accounts without directly going through Agendors' configuration file; twelfthly, we will need probably some kind of abstraction layer for additional security issues which might arise when accessing certain sensitive databases through web service remoting; thirteenthly, we will need some kind of logging mechanism which records all the activities performed by users through web service remoting; fourteenthly, we will need a kind of mechanism which allows us to use SQL queries executed by users through web service remoting in a transparent manner without modifying our existing SQL parsing mechanism; fifteenthly, we should probably develop some kind of framework which makes our life easier when implementing web service remoting based interfaces; sixteenthly, since there is no standard for defining remote procedure call (RPC. mechanisms across different languages so we might encounter some difficulties while trying to map calls made by users through web service remoting back into appropriate RPC calls at runtime; seventeenthly, we should probably add some kind of feature which allows us to store any kind of data on our database without losing any properties which exist in our current XML data model; eighteenthly, we should probably add some kind of feature which allows us to use SQL queries executed by users through web service remoting in a transparent manner without modifying our existing SQL parsing mechanism; nineteenthly, we should probably develop some kind of framework which makes our life easier when implementing web service remoting based interfaces; twentiethly, since there is no standard for defining remote procedure call (RPC. mechanisms across different languages so we might encounter some difficulties while trying to map calls made by users through web service rem

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