High-Level JTS/TopLink design question

I've gone through the "using JTS with TopLink" docs, and it mostly makes sense. However, I still don't understand how TopLink "knows" when I call acquireUnitOfWork() whether or not I'm participating in a distributed 2PC transaction.
Said another way:
Let's say I've got an application based on TopLink (registering appropriate JTS stuff) that exposes an API that can be accessed remotely (RMI, SOAP, whatever).
And, I've got another, separate application using a different persistence-layer technology (also supporting JTS) that also has an API.
Now, I create a business method that uses the APIs from both of these applications, and I want them to participate in a single, distributed transaction.
At a high level (source code is unnecessary), how does that work?
Would the API need to support an ability to specifiy a TransactionContext or is this all handled behind the scenes by the 2 systems registering with the Transaction Service?
If this is all handled through registration, how do these 2 systems know that these specific calls are all part of the same XA transaction?

Nate,
TopLink particiaptes in JTA/JTS transactions but dows not control them. When you configure TopLink to use the JTA/JTS services of the host application server you are deferring TX control to the J2EE container. TopLink will in this case register each acquired UnitOfWork in the current active TX from the container. The container will also ensure that the JDBC connection provided to TopLink is also bound by the active TX.
In order to get 2PC you must register multiple resources into the same JTA TX. The TX processing during commit will then make the appropriate call backs to the underlying data source as well as the necessary call backs to listeners suchs as TopLink to have its SQL issued against the database.
In short: The J2EE container manages the 2PC TX and TopLink is just a participant.
Doug Clarke

Similar Messages

TopLink Design Question

I've PersistenceManager Java class that extends SessionEventAdapter. This PersistenceManager has methods to create, read, delete, etc, methods, which are used to access the databse. I've a PersistenceManagementService java (it is a singletone) class. In the application if any object wants to access the databse, first they need to get the PersistenceManagementService and from it they can get the PersistenceManager object to access the databse. The PersistenceManager has ServerSession object, which is used to get the UnitOfWork to create and write objects to the databse.
With this design I've following questions:
1. At present PersistenceManagementService creates only one instance of PersistenceManager and gives it to the caller. Is it good to keep it like this, or to increase the performance can I create multiple PersistenceManager obects so that application can concurrently read and write objects to the databse.
2. If I create multiple PersistenceManager objects, does TopLink create multiple ServerSession objects?
3. What is the best way to achive good performance in this design?
Thanks
-Mani

Mani,
The ServerSession should be treated as a singleton and held by your service. For each thread/client accessing the server you should acquire a ClientSession from the singleton ServerSession. The ClientSessions provide the shared multi-threaded access to the shared resources of the ServerSession.
In you design this means you should create a PersistenceManager for each thread/client that wraps a ClientSession. Make sure that at the conclusion of each thread's operations that it releases the ClientSession so that any resources it has acquired can be made available to other threads.
This model will give you better concurrency support in a multi-threaded environment and will greatly reduce contention on write operations.
Beyond this solution there are numerous features of TopLink that you should make use of to increase performance. The ones that are best to start with are:
- Batch & Join reading on Queries
- Indirection
- Efficient use of the UnitOfWork (only register what you know you are going to change)
- Parameter binding and prepared statemet caching
- batch writing
There are all discussed in the documentation and the performance appendix of the docs also lists key features to high performance systems.
Cheers,
Doug

High-level design for business process scenario

Hi all, I have a business process scenario for which CRM and ECC has to be used. The scenario is like this:
There are 2 subsidiaries of a company - A and B, which are into trading of materials.
Between A and customer there is sales agreement. Between B and vendor there is purchase agreement.
Whenever customer requires materials, it will send request to A. So, A creates a sales order. B in turn sends a request to vendor for which a purchase order is created. The vendor ships the goods directly to customer. The vendor bills B for the purchase order. B adds some margin and then it goes for inter-company settlement with A. A bills the customer for the materials. In this entire process, both A and B earns profit through margins.
It has to be noted that CRM has to be used as contact point with customer.
Now I have the following questions:
1. How would the high-level business design be like?
2. How would be the document flow?
3. How can inter-company settlement and billing be done?
All constructive comments and feedback will be rewarded.

Hi Animesh,
The thumb rule to CRM process designing is stick to customer process...
Thus u jst hav to stick to process design of company A and its interaction with Customer.
We are not concerned with how the material will be purchansed,but we are concerned with how we will be delivering it to end customer.
Thus, once customer place an order to company A, our process would suggest a sales order for the customer with one of the partner function "Vendor" as B with the required material. Now later process in R/3 would convert this sales order with customer as soldtoparty to purchase order with vendor as B and one of the secondary partner soldto party as our original customer.
And billing would happen the way it is... ie. based on sales order.. thus u will have some inflow.. again u will be raising a purchase requisition to company B thus that would be your outflow..
That was a really good scenario to think about.
Best Regards,
Pratik Patel
<b>
Reward with Points!</b>

High Level Thread Implementation Questions

Hi,
Before I take the plunge and program my software using threads, I have a few high-level questions.
I plan on having a simulation class that intantiates software agents, each with different parameters. There is an agent class, with constructor, methods etc. Each agent has a sequence to go through. Once completed, the iteration number is increased and the sequence is repeated. That's simple enough to do.
The question is, is it worth executing each agent on a different thread?
If there is around 500 - 1000 lines of code (crude measurement, I know) how many can I expect to thread efficiently?
One parameter allows an agent to execute n cycles for each global iteration. (i.e. in one iteration, agent A runs once, agent B runs 5 times). Could this be a problem? Should this be controlled outside the agent, or inside it?
Can I write the code without having to worry about threading, or do I have to design the agent code with threading in mind?
Will they really run in parallel? It is important that there is no bias to the execution order. I can solve this messily without using threads by randomising the execution order - but that is a messy work around - and why I'm looking at threads.
Can threaded objects interact easily with non threaded one when execution order is important?
Are there any other points that I should consider?
Thanks in advance - any information before I enter this unchartered territory will be truly appreciated!!

I think you are better off running this all in a single thread.
Threads make no guarantee as to scheduling. Threads do not increase efficiency (unless your agents block on i/o, or sleep). Threads come with an overhead cost.
Threads don't guarantee no bias to execution order.
Threads require synchronization to ensure safe interaction between each other. This is a bit of extra work, and can be a bitch if you're not familiar with it.
Yes, threads run in parallel. If you have multiple processors then they can truly run in parallel, otherwise they run in time slices.

Basic XML Publisher Question: How to access tags in the higher levels?

Hi All,
We have a basic question in XML Publisher.
We have a xml hierarchy like below:
<CD_CATALOG>
<CATALOG>
<CAT_NAME> CATALOG 1</CAT_NAME>
<CD>
<TITLE>TITLE1 </TITLE>
<ARTIST>ARTIST1 </ARTIST>
</CD>
<CD>
<TITLE> TITLE2</TITLE>
<ARTIST>ARTIST2 </ARTIST>
</CD>
</CATALOG>
<CATALOG>
<CAT_NAME> CATALOG 2</CAT_NAME>
<CD>
<TITLE>TITLE3 </TITLE>
<ARTIST>ARTIST3 </ARTIST>
</CD>
<CD>
<TITLE> TITLE4</TITLE>
<ARTIST>ARTIST4 </ARTIST>
</CD>
</CATALOG>
</CD_CATALOG>
We need to create a report like below:
CATALOG_NAME     CD_TITLE     CD_ARTISTCATALOG 1     TITLE1     ARTIST1
CATALOG 1     TITLE2     ARTIST2
CATALOG 2     TITLE3     ARTIST3
CATALOG 2     TITLE4     ARTIST4
So we have to loop at the level of <CD> using for-each CD. But when we are inside this loop, we cannot access the value of CAT_NAME which is at a higher level.
How can we solve this?
Right now, we are using the work-around of set_variable and get_Variable. We are setting the value of CAT_NAME inside an outer loop, and using it inside the inner loop using get_variable.
Is this the proper way to do this or are there better ways to do this? We are running into troubles when the data is inside tables.

you can use
<?../CAT_NAME?>copy past to your template
<?for-each:CD?> <?../CAT_NAME?> <?TITLE?> <?ARTIST?> <?end for-each?>

Aggregation level - design question

Hi, All
we are in BI-IP ( Netweaver 2004s SPS16).
I have a design question for this scenario.
User needs to plan the amounts for a duration (start period and end period), Jan2008 -Dec2008 (001.2008, 012.2008) = 12000.
We need to distribute this to the periods equally. 001.2008 = 1000, 002.2008 =1000 .... 012.2008=1000.
If the user changes the period amounts, it should be reflected back in the duration amount.
Pl suggest the design for the aggregation levels to achieve this.
Thanks in advance.
velu

Hello Velu,
As the name also goes, creating an "aggregation level" will only result in "aggregation". What your requirement is, is called disaggregation or distribution - this cannot happen automatically - you will either have to use the feature in input queries or use the distribution planning function or create your own planning function using fox/exit.

High Level Network Design

Hi Guys
I am posting this because I am starting my career into network design and want some help in it. I am at present in need of a high level design overview as I need to prepare some high level network design documents. Can anyone shower some thoughts in it as how about doing this and if any there is a template for HDD so that it maybe useful.
Also I believe in keeping information as transparent as possible to the readers of the document and need someone to explain in very simple terms if at all it is possible.
Thanks a lot
Vin

Hi Vin,
I would check the Cisco SBA and Validated Design Zone as a first pass.
Lots of great design documents there.
As for how I would create a high level design - keep it simple. You just want an overview of the connectivity - e.g. for a dual-site head office with 100+ branch wan, I would only show a single branch site as a template.
Every network is different, but the more documentation you write and read the more you will define your own style.
Apologies I can't give you any of my customer's documentation - NDA's and everything!
Regards, Ash,

Very High-Level Question on Approach (PI ccBPM or CE7.1?)

All -
I have a very high-level question. I am not current on what would be the appropriate tool for my scenario.
My scenario...
Transitioning business to use new sales order system.
This will be a phased roll-out, not Big Bang.
Company ordering website needs to send orders to one of two systems (new and old).
Assume order has a flag or some other value that is an indicator to which backend application it should be sent.
Each recieving application has an order insert web service, which would be in PI 7.1's ESR.
What we "envision" is that there would be some kind of fronting web/enterpise service that would read the "flag", then pass the message to the appropriate web service (and on to the appropriate application).
But I really am not clear how to architect this, if any rules "engines" (ccBPM or in CE 7.1) would be or should be used.
You opinions are welcome...
Thank you for your time...

Hi Eric,
It would be more elegant , if you can classify this orders logically and provide two user interfaces one for each type.
But coming back to your question , if you are planning to implement the process in BPM , you could utilize the capabilities of BRM for this purpose . BRM comes with CE 7.1 and works in conjunction with BPM.
[BRM Help|https://www.sdn.sap.com/irj/sdn/nw-rules-management]
Once you want a complete roll out , you can remove the BRM decision making.Logically this would solve the purpose. ccBPM is not really positioned for this approach. It can be used when you need to interact with multiple systems using different protocols.
Caveat : The use of BPM will restrict your UI to WebDynpro Java (atleast for now). The whole process needs to be built around webservices or RFCs.
Regards
Bharathwaj

Design considerations for wrapping higher level process

So Ive used workflow now on a few projects and have become comfortable building/coding with it. Recently a discussion was started to design a new process to automate a part of the business Im in and there are several different departments, each with
their own different functions and processes that they perform. During this discussion, the thought came to me - why stop with just the "small" picture where I was using WF to contain and execute business rules, but also wrap the higher level
abstractions also.
For example, a department performs steps A, B and C. Each step might have some branching in it (if/then etc). Its only the "steps Im using workflow currently.
Above the department, there is another layer, lets call it "group". There would be several different groups, each with its own departments, some with the same name as other groups, but the internal structure might be different for a given
department between groups. So this means that if I modeled a department in one group, I cant assume I can reuse that department in another groups workflow.
My main unknown however, is how would a user interact with a workflow that was this high level. Abstracting higher levels, means users dont need to interact with or execute the whole workflow each time, only a part of it. So am I looking at pausing/resuming
the bigger workflow? How can I "skip" to a certain stage or area of a workflow, bypassing the stuff that has already been done?
Correct me if Im wrong, but this seems to be where I need to look at bookmarks?
In my case, something similar to an order in a shopping cart is what would be the input type for the bigger workflow. There are several different groups of users that have to set or add properties to associated objects (sql tables) related to the order
before it can be marked "complete".
How would you tie together a "wizard" type concept with workflow? This seems to be the type of model we are considering. A user takes an order a few steps, then another user from a different group/department adds some attributes and
the workflow/wizard continues a few more levels down. Finally, after all the rules have been matched and required data provided, the workflow can "finish".
Hope my description seems clear.

My main unknown however, is how would a user interact with a workflow that was this high level. Abstracting higher levels, means users dont need to interact with or execute the whole workflow each time, only a part of it. So am I looking at pausing/resuming
the bigger workflow? How can I "skip" to a certain stage or area of a workflow, bypassing the stuff that has already been done?
If you want to skip to certain state or bypass what stuff that has been done, you need give logic judgment first. Bookmarks are the mechanism that enables an activity to passively wait for input without holding onto a workflow thread. When an activity signals
that it is waiting for stimulus, it can create a bookmark. So bookmark is available for you during create this application.
Here are some workflow applications, see:
Workflow Application
hope it helps.
Regards,
Angie
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Running a Sub-VI and monitoring data that is generated on a higher level VI

Hi All,
This question must been there before, but I cannot find a suitable answer here on the forums....
I have a 'top-level' VI that does a lot of things. I also have a sub VI that runs a frequency sweep on a piece of equipment. This is done with a for loop.
Problem:
I want to monitor/access the data that is generated in the for loop (See attached, the 3 wires within the green circle I want to monitor).
2 Questions:
How can I access the data on the wires (within the loop) from a higher level VI?
How can I then run this VI in a higher level VI while the higher level VI is continuing and not waiting for the sub-VI to complete?
I tried using a Que but I cannot seem to get that working.
Any suggestions?
Regards,
Attachments:
LV problem.PNG ‏44 KB

The queue is a good way to move data from a running subVI to another VI. Your problem is that if the subVI is inside a loop in the main VI, that loop in the main VI cannot iterate until the subVI completes. The solution: have the sub VI running in parallel - not inside - the loop.
Look at the Producer/Consumer Design Patterns (at File >> New... >> VI >> From Template >> Frameworks >> Design Patterns >> Producer/Consumer. This may be more than you need at the moment but will show how the parallel code process works.
Lynn

Design question: Scheduling a Variable-timeslot Resource

I originally posted this in general java programming, because this seemed like a more high-level design descussion. But now I see some class design questions. Please excuse me if this thread does not belong here (this is my first time using the forum, save answering a couple questions).
Forum,
I am having trouble determining a data structure and applicable algorithm (actually, even more general than the data structure -- the general design to use) for holding a modifiable (but more heavily read/queried than updated), variable-timeslot schedule for a given resource. Here's the situation:
Let's, for explanation purposes, say we're scheduling a school. The school has many resources. A resource is anything that can be reserved for a given event: classroom, gym, basketball, teacher, janitor, etc.
Ok, so maybe the school deal isn't the best example. Let's assume, for the sake of explanation, that classes can be any amount of time in length: 50 minutes, 127 minutes, 4 hours, 3 seconds, etc.
Now, the school has a base operation schedule, e.g. they're open from 8am to 5pm MTWRF and 10am to 2pm on saturday and sunday. Events in the school can only occur during these times, obviously.
Then, each resource has its own base operation schedule, e.g. the gym is open from noon to 5pm MTWRF and noon to 2pm on sat. and sun. The default base operation schedule for any resource is the school which "owns" the resource.
But then there are exceptions to the base operation schedule. The school (and therefore all its resources) are closed on holidays. The gym is closed on the third friday of every month for maintenance, or something like that. There are also exceptions to the available schedule due to reservations. I've implemented reservations as exceptions with a different status code to simplify things a little bit: because the basic idea is that an exception is either an addition to or removal from the scheduleable times of that resource. Each exception (reservation, closed for maintenance, etc) can be an (effectively) unrestricted amount of time.
Ok, enough set up. Somehow I need to be able to "flatten" all this information into a schedule that I can display to the user, query against, and update.
The issue is complicated more by recurring events, but I think I have that handled already and can make a recurring event be transparent from the application point of view. I just need to figure out how to represent this.
This is my current idea, and I don't like it at all:
A TimeSlot object, holding a beginning date and ending date. A data structure that holds list of TimeSlot objects in order by date. I'd probably also hold an index of some sort that maps some constant span of time to a general area in the data structure where times around there can be found, so I avoid O(n) time searching for a given time to find whether or not it is open.
I don't like this idea, because it requires me to call getBeginningDate() and getEndDate() for every single time slot I search.
Anyone have any ideas?

If I am correct, your requirement is to display a schedule, showing the occupancy of a resource (open/closed/used/free and other kind of information) on a time line.
I do not say that your design is incorrect. What I state below is strictly my views and should be treated that way.
I would not go by time-slot, instead, I would go by resource, for instance the gym, the class rooms (identified accordingly), the swimming pool etc. are all resources. Therefore (for the requirements you have specified), I would create a class, lets say "Resource" to represent all the resources. I would recommend two attributes at this stage ("name" & "identifier").
The primary attribute of interest in this case would be a date (starting at 00:00hrs and ending at 24:00hrs.), a span of 24hrs broken to the smallest unit of a minute (seconds really are not very practical here).
I would next encapsulate the availability factor, which represents the concept of availability in a class, for instance "AvailabilityStatus". The recommended attributes would be "date" and "status".
You have mentioned different status, for instance, available, booked, closed, under-maintainance etc. Each of these is a category. Let us say, numbered from 0 to n (where n<128).
The "date" attribute could be a java.util.Date object, representing a date. The "status", is byte array of 1440 elements (one element for each minute of the day). Each element of the byte array is populated by the number designation of the status (i.e, 0,1,2...n etc.), where the numbers represent the status of the minute.
The "Resource" class would carry an attribute of "resourceStatus", an ordered vector of "ResourceStatus" objects.
The object (all the objects) could be populated manually at any time, or the entire process could be automated (that is a separate area).
The problem of representation is over. You could add any number of resources as well as any number of status categories.
This is a simple solution, I do not address the issues of querying this information and rendering the actual schedule, which I believe is straight forward enough.
It is recognized that there are scope for optimizations/design rationalization here, however, this is a simple and effective enough solution.
regards
[email protected]

Table design question

Hello,
I have a quick question on a table design. I currently have a table that will store approval information on a report. The individual report will need to go through 3 levels of approval before it's considered final. I have considered a few different scenarios on how to design the table but I'm not sure on what is the best choice. Currently I'm using 3 columns that will store each approval. For example,
Table 1:
file_id,
subject,
summary,
division_approve,
program_approve,
group_approve
I thought about using one column and simply stepping through a higher numeric value for each approval but found that doesn't work if I want to view items that were approved only at the division_approve level. Does anyone else have any suggestions? Hopefully I provided enough information.....
Thanks in advance!
Randy

yes, better going for higher level of normalisation and desiging more tables:
tab_aproval ( id,File_id,Approval_authority,rank )
id      File_id Approval_level rank
1     1 first_level 1
2     1 second_level 2
3     1 third_level 3
4     2 first_level 1
5     2 second_level 2
tab_file_approval
file_id, subject, summary, id
1 'doc 1' 'first level done' 1
1 'doc 1' 'second level done' 2
1 'doc 1' 'third level done' 3

High-level business process scenario

Hi all, I have a business process scenario for which CRM and ECC has to be used. The scenario is like this:
There are 2 subsidiaries of a company - A and B, which are into trading of materials.
Between A and customer there is sales agreement. Between B and vendor there is purchase agreement.
Whenever customer requires materials, it will send request to A. So, A creates a sales order. B in turn sends a request to vendor for which a purchase order is created. The vendor ships the goods directly to customer. The vendor bills B for the purchase order. B adds some margin and then it goes for inter-company settlement with A. A bills the customer for the materials. In this entire process, both A and B earns profit through margins.
It has to be noted that CRM has to be used as contact point with customer.
Now I have the following questions:
1. How would the high-level business design be like?
2. How would be the document flow?
3. How can inter-company settlement and billing be done?
All constructive comments and feedback will be rewarded.

Hello Animesh,
Can you please let me know the solution you found for the intercompany business process. I have the similar kind process which needs to be configured in CRM7.
Thanks a lot
Lingaiah Manne

Where can I find various high level examples of workflows being used

I am about to start a project with TCS 3.5 and have been participating in the Adobe webinars to help learn components and specific techniques but what I am lacking is an understanding of various workflows I can model my project after or take bits from various sources. Why start with Framemaker in this workflow versus RoboHelp or even Word? Questions like this I think come from experience with the process and I am thinking that what I am getting myself into is a chessgame with all these pieces and don't want to paint myself into a corner by traveling down one route. I have seen this graphic:
And this one:
And this one:
But they are too generic and do not contain enough information to really understand the descision making process one must go through on various projects.
Can we have a series of webinars made, all with the underlining theme of defining a working process or workflow, by having guests describe how they have or are using this suite in real life on their own projects? One that might include a graphic showing the routes taken through the suite with reasons why?
My project hopes to make a single source internal site that will tie together various 3D portable industrial coordinate metrology systems (hardware and software). It would be used as a dispersal site for help, communications between users and SME, OEM information, QA requirements, established processes, scripting snipet downloads, statistics, and training (including SOJT). Portable industrial metrology has 8 different softwares that are used and right now about 8 different instruments. These include laser trackers and radars, articulated arms, scanners, structered white and blue light to name a few. The softwares include Spatial Analyzer, Veriserf, CompIT, eMscon, AXYZ to a few there as well. I want to be able to participate and add content to an internal Sharpoint site, push content to users for stand-alone workstations, ePub, capture knowledge leaving the company through attrition, develop easy graphic rich job aid sheets, and aid in evaluations of emergent software and hardware. I would also like to leave the option open to use the finished product as a rosetta stone like translator between the software packages; doing this is the equivelent of doing this in these other software pacages for example.

PDF is definately a format I want to include, to collaborate with other divisions and SME for one reason, but also for the ease in including 3D interactive target models with in it and portability. I plan on being able to provide individual PDFs that are very specific in their topics and to also use them to disperse user guides, cheat sheets or job aids... something the user may want to laminate on their own and keep with them for reference, printed out. Discussion in these sheets would be drasticly reduced to only the elements, relying heavely on bullet points or steps, usfull graphs, charts and tables... and of course illustrative images. I am thinking that these should be downloadable buttons to print on each topic section, not in a general apendix or such. They would hopefully be limited to one page, double sided 8x10.
The cheet sheet would have a simplistic flow chart of how or where this specific topic fits in the bigger picture,
The basic steps,
Illustrations, equipment, setup
Software settings for various situations in a table or chart,
Typical result graph to judge with,
Applicable QA, FAA regulation settings or concerns,
Troubleshooting table,
Topic SME contact info
On the back, a screen shot infographic of software process
The trouble here is that I have read that FM has a problem sometimes in succesfully transfering highly structured or formatted material to RoboHelp. Does this then mean that I would take it from FM straight to PDF?
Our OEM material is very high level stuff... basicly for engineers and not shop floor users... but that is not to say they don't have some good material that could be useful. Our internal content is spread out across many different divisions and continents, with various ways of saying the same thing. This leads QA to interpret the information differently depending where the systems are put to work. We also have FAA requirements that need to be addressed and reminded to the user.
Our company is starting to also see an exodus of the most knowledagble of the users through retirement. Capturing the knowledge and soft skill packages they have developed working here for 20-30 years is something I am really struggling with. I have only come up with two ideas so far:
Internal User Web based Forum
Interviews (some SMEs do not want to make the effort in transfering knowledge by participating in anything if it requires an effort they don't see of benefit to themseleves), to get video, audio or transcription records

Assign a Position in CRM to an Organization Unit at a higher level.

Hi,
While configuring the Organizational Management in CRM 5.1, I have copied the sales areas created in ECC to CRM.
The resulting structure is a freely definable Org Unit at the top level called Sales Area (as is was created in ECC) and under that all the Sales Organizations are existing.
I need to create positions for the Sales Organizations and assign employees to these positions created.
As per our client requirement, I need to create the positions at the higher level (probably the Org unit level) and assign the employees to these positions created.
The reason for doing this is that the same employees work across different Sales Orgs.
Is it possible to create the positions at the highest level so that they can be inherited by the Sales Orgs defined below or do i need to create the positions and the employees separately for each Sales Org.
I would appreciate if you could answer at the earliest. I need to complete the configuration at the earliest.
warm regards,
Rohan Bhate

Hello,
Try this SAP CRM: Webclient UI - Framework for this kind of question.
Regards,
Fred

High-Level JTS/TopLink design question

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