Application Architecture Suggestions

Hi,
I'm currently writing a library/application which will integrate with a number of systems. The application will be used by other systems to generate HTML forms, for which there are definitions stored in a database, and to store the information saved in the form by system users.
I'm new to Java EE and was wondering if anybody could point me in the general direction of technologies (or architecture) which I should be using (I'll define some rules bellow for what is required) and to suggest tools which I could use. I'm currently using JBoss AS 1.5 along with the JDK 1.6, MySQL 1.5 and Eclipse for an IDE.
Here are some requirements for the system:
- Must have a web interface to allow users to define a form (which will be stored in a database)
- Must be able to dispense forms for use within a system
- Must either be hosted in the application (i.e. a code library + database hosted in a system) or be a stand alone application which has its own database and which can tightly integrate with a system)
- Must appear to the user that the form is tightly integrated in the system (e.g. looks the same, does not need to open in a pop-up window...)
- Must be able to populate form fields with information stored in the system (I was thinking of web services for this part)
- Must be able to store information entered in form in the system (e.g. a date of birth...) (Again I was thinking of web services for this part)
I could do with some suggestions on possible architectures of how this should all fit together.
I know this is a big ask but I'm close to giving up because I'm not sure where to start.
Thanks in advance,
J.Love

J.Love wrote:
Hi,
I'm currently writing a library/application which will integrate with a number of systems. The application will be used by other systems to generate HTML forms, for which there are definitions stored in a database, and to store the information saved in the form by system users.
I'm new to Java EE and was wondering if anybody could point me in the general direction of technologies (or architecture) which I should be using (I'll define some rules bellow for what is required) and to suggest tools which I could use. I'm currently using JBoss AS 1.5 along with the JDK 1.6, MySQL 1.5 and Eclipse for an IDE.
JBoss AS 1.5? You should at least be on 4.2.x or 5.x.
Here are some requirements for the system:
- Must have a web interface to allow users to define a form (which will be stored in a database)Pick a MVC framework of your choosing. Spring MVC, JSF 2.0, Grails, etc. When you say "users to define a form". What does that mean? That users will drag and drop UI elements in a designer and then publish a web form for others to use?
- Must be able to dispense forms for use within a systemAgain, I'm not clear on what you mean here.
- Must either be hosted in the application (i.e. a code library + database hosted in a system) or be a stand alone application which has its own database and which can tightly integrate with a system) JBoss can handle this for you. Package everything appropriately as a WAR or EAR, preferably with a build tool such as Ant or Maven.
- Must appear to the user that the form is tightly integrated in the system (e.g. looks the same, does not need to open in a pop-up window...)Again, is this a form the user has designed or simply one the user uses that you have designed?
- Must be able to populate form fields with information stored in the system (I was thinking of web services for this part)Information stored in a system can be the filesystem or a database or a network resource somewhere else. The web service part is simply how clients will invoke your services. (Do a search on service-oriented architecture). Personally, I would opt not for a web service but for something simpler, like REST.
- Must be able to store information entered in form in the system (e.g. a date of birth...) (Again I was thinking of web services for this part)
Separate the protocol and format you are using (e.g., web service SOAP, JSON over REST, XML over HTTP POST, etc.) from the requirement for storage. You will generally have a controller receive a request and forward to a service (or have the service receive the request if there is no UI) and then delegate to a data access object to fetch and store data. See the MVC pattern generally and data access object pattern specifically.
I could do with some suggestions on possible architectures of how this should all fit together.
See the above. MVC is your first high-level separation. Then you likely want a service tier (see SOA). If you think it is merited, you can implement your service and controller tiers with the Command pattern, though this is optional. Don't worry so much about protocols and standards. Get things working first. Then worry about how clients will communicate with you.
I know this is a big ask but I'm close to giving up because I'm not sure where to start.
Hence, take it in small pieces. Get things working in memory. Then save things to the database. Then accept requests to do so from a web page. Then start choosing how you want things to work as a whole. If you are totally stuck, bottom-up often works. At some point, you will have to revisit things and go top-down. There's no right or wrong answer, just start coding and have an idea in your head (or on a napkin) of how things should flow and work. Use bubbles and arrows and nouns and verbs. Then translate those one at a time into working code. Wash, rinse, repeat.
Thanks in advance,
J.LoveBest of luck.
- Saish

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hello
we have several internal systems that are within the same lan and want to communicate with several external systems that may be in the other buildings by using the release line.i am now considering the architecture for the project,and have got an immature blueprint,please help me to make it more perfect by give me your opinions,the scenario as:
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in my project,the timelimit is critical,as short as possible.
according to the mentioned requirements,i decide to develop a infomation exchanging platform by using java which sit in the MIDDLE of the internal and external systems and WITHIN the lan,act as information dispatcher or coordinator,both of the internal system and external system communicate with it only.considering the multi-language and time-critical feature,i choose the way of socket communication among the systems and design a set of xml format internal protocol.otherwise,i think the message middleware are also needed within my project as message buffer.when i deepen into the detailed designing,i get some confusions,let us discuss them as followiing:
1 if is the socket the good solution for my project?how can i assign the ports?because of the introduction of the information exchanging platform into my project,the communication combination is simplified to "internal system<-->info exchange platform" and "external system<-->info exchange platform",the crucial point for the port designing is how to assign the port in the info exchange platform,that is SERVER socket port.in my designing,i plan to assign different port for each subsystem.thus,the devleopment to the info exchange platform is simplified,that is:when the message comes,i don't need to analyse the xml message to check which system it comes from.but some people suggest me to open ONE port to all the internal systems,and ANOTHER port to all the external sysetms.i don't know which solution is better?if are there some regulations that concern about the socket port assigning?
2 if is the information exchanging platform needed?some one suggest that subsystems can communicate with each other directly,
the coordinating platform is not needed.but i think,from the EAI point of view,there should be a adapter between the internal system and external system.
3 where should i put the message queue server?and if is the mom needed?i plan to use the mq between the exchange platform and external systems ONLY,and it is also within the lan,in my designing,i config two queue for EACH external system,one for incoming message and other for outgoing message,to each queue,i assign a message listener to execute different operations on its "onMessage" method,that is:when the message come from internal system,the exchange platform send them to the exact OUTGOING queue according to the destination of the message,then the listener of the queue call the socket of the according external system and send the message to it.otherwise,when the external system need to send the message to internal system,it call the exact socket port in the exchange platform that is assigned to it as mentioned above,the platform accept the msg,and send them to the exact incoming queue,then the listener deal with the msg and send them to the internal destination.in this solution,i put the mq behind the socket,but someone give me another suggestion,that is i directly put the message queue between the exchange platform and the external systems instead of using the socket as the front-end,all of them send the message to the queue and listen the queue,but i think,in such solution,the external system must listen the queue REMOTELY,is it a good way?
also,somebody tell me that the exchange platform and remote external system can communicate each other DIRECTLY by socket,the message queue is not needed,i don't make sure if the mq is necessary in my situation?and what is the benefit and disadvantage?
as for the communication between the internal system and info exchange platform,i think the mq is NOT needed,they can communicate each other directly by socket,furthermore,in my designing,i make them connect to each other FOREVER,that is i don't close the socket after each message transferation,as mentioned above in the issue of the socket assigning,every port in the exchange platform is DEDICATED,that means the port is specific to each system,so that they don't need to create and close socket connection frequently,that will make the program more performant,but if i use one port to listen all the internal system,then the socket must be closed by the end of each transferation because of the block problem,that is just another reason why i use dedicated port connection to each of the internal system.
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hello
we have several internal systems that are within the same lan and want to communicate with several external systems that may be in the other buildings by using the release line.i am now considering the architecture for the project,and have got an immature blueprint,please help me to make it more perfect by give me your opinions,the scenario as:
within the lan,there are several systems that are developed by using different languages,let's suppose they are two(named internal1 and internal2),the two systems need to communicate with other two external systems(named external1 and external2) that are also developed by using different languages.all of the communications are bi-direction.there are several combinations:
1 internal1 <--> internal2
2 internal1 <--> external1 or external2
3 internal2 <--> external1 or external2
in my project,the timelimit is critical,as short as possible.
according to the mentioned requirements,i decide to develop a infomation exchanging platform by using java which sit in the MIDDLE of the internal and external systems and WITHIN the lan,act as information dispatcher or coordinator,both of the internal system and external system communicate with it only.considering the multi-language and time-critical feature,i choose the way of socket communication among the systems and design a set of xml format internal protocol.otherwise,i think the message middleware are also needed within my project as message buffer.when i deepen into the detailed designing,i get some confusions,let us discuss them as followiing:
1 if is the socket the good solution for my project?how can i assign the ports?because of the introduction of the information exchanging platform into my project,the communication combination is simplified to "internal system<-->info exchange platform" and "external system<-->info exchange platform",the crucial point for the port designing is how to assign the port in the info exchange platform,that is SERVER socket port.in my designing,i plan to assign different port for each subsystem.thus,the devleopment to the info exchange platform is simplified,that is:when the message comes,i don't need to analyse the xml message to check which system it comes from.but some people suggest me to open ONE port to all the internal systems,and ANOTHER port to all the external sysetms.i don't know which solution is better?if are there some regulations that concern about the socket port assigning?
2 if is the information exchanging platform needed?some one suggest that subsystems can communicate with each other directly,
the coordinating platform is not needed.but i think,from the EAI point of view,there should be a adapter between the internal system and external system.
3 where should i put the message queue server?and if is the mom needed?i plan to use the mq between the exchange platform and external systems ONLY,and it is also within the lan,in my designing,i config two queue for EACH external system,one for incoming message and other for outgoing message,to each queue,i assign a message listener to execute different operations on its "onMessage" method,that is:when the message come from internal system,the exchange platform send them to the exact OUTGOING queue according to the destination of the message,then the listener of the queue call the socket of the according external system and send the message to it.otherwise,when the external system need to send the message to internal system,it call the exact socket port in the exchange platform that is assigned to it as mentioned above,the platform accept the msg,and send them to the exact incoming queue,then the listener deal with the msg and send them to the internal destination.in this solution,i put the mq behind the socket,but someone give me another suggestion,that is i directly put the message queue between the exchange platform and the external systems instead of using the socket as the front-end,all of them send the message to the queue and listen the queue,but i think,in such solution,the external system must listen the queue REMOTELY,is it a good way?
also,somebody tell me that the exchange platform and remote external system can communicate each other DIRECTLY by socket,the message queue is not needed,i don't make sure if the mq is necessary in my situation?and what is the benefit and disadvantage?
as for the communication between the internal system and info exchange platform,i think the mq is NOT needed,they can communicate each other directly by socket,furthermore,in my designing,i make them connect to each other FOREVER,that is i don't close the socket after each message transferation,as mentioned above in the issue of the socket assigning,every port in the exchange platform is DEDICATED,that means the port is specific to each system,so that they don't need to create and close socket connection frequently,that will make the program more performant,but if i use one port to listen all the internal system,then the socket must be closed by the end of each transferation because of the block problem,that is just another reason why i use dedicated port connection to each of the internal system.
4 the another question is the secure issue accompanying by the socket,i think i needn't consider such problem in the internal connection,but to the connection between the platform and external system,the issue become preeminent,that is i must open the socket port in the firewall.but i think the connection between the lan and the external system use special line,not by internet,i wonder if the secure probem is critical in such situation?otherwise,i remember that some kinds of product from visibroker company can solve the firewall socket problem by using the http channel protocol,but i don't remember its name for sure,it seem like is called something gateway.who used such kind thing?and tell me how does it work?

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My question is if can anyone advice me if this architecture is good or not. I was thinking about object persistence too (mainly JDO) but in my count of tables seems it to me as really hard work, and with entity beans I haven't so much experiences. When to use JDO and when jdbc acces ?
Secondly I want to ask this:
I am used to program in java in jdbc to regular database (mysql, oracle) and there I am able to create my DB tables and so on through script generated from modeling tool. Is this can be in Java Dictionary ? or I have to click my tables in Java Dictionary Perspective. And how can I set foreign key constraints in Java Dictionary Perspective ? is it posible ? or I have to check reference integrity each time I use Insert, Update, Delete commands ?
I know this is quite many question at once, but I will be glad if anyone can answer any of that.
Best Regards,
Miroslav Koskar

Miroslav,
Your application seems to reach "critical mass" of business objects involved. If you can -- go ahead with CAF.
Any other approach will work too -- be it either Entity EJB with session facade or JDO (directly / indirectly exposed). But...
You'll will have to create plain JavaBeans for DTO in case of EJB... Even with JDO you'll have to track CUD operations in CRUD differently hence repeating work that CAF team already did. Next you'll have to create JavaBean models for your objects (thought, not a rocket science till time of model upgrades). Next you'll have to tweak this model to use types from data dictionary... And, again, this is provided with CAF out of the box...
Your second question is actually minor one -- using DDIC is possible with either approach and referntial integrity will be preserved with either technology.
Valery Silaev
EPAM Systems
http://www.NetWeaverTeam.com

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