How to design multiple file polling BPEL process?

Question

Hi all,
I am trying to solve/design the following in BPEL process:
- The integration process flow I am trying to design is an interaction b/n system A (FTP server), an Integration platform and system B.
- The integration platform will poll files from an internal FTP server. It has 2 Time files (“Time1” and “Time2”) alternatives to poll from the FTP server. It will then transform the message/information inside the files (time information) to an internal XML format. At the end it shall send the message to system B.
- The information inside the files is identical. The reason to have 2 files with identical information is for redundancy. The integration-platform shall only poll file “TIME1” as long as the conditions are met. If the conditions are not met, then it polls file “Time2”.
Normal succeeded scenario:
1- The integration platform polls the latest “Time1” file from the internal FTP server. The polling is done every 15th minute.
2- The integration platform logs to BAM and reports that the file is received.
3- The platform then converts the message to an internal format.
4- The platform sends the converted message/time information to system B.
5 - The use-case ends.
Not normal scenario:
1- The platform cannot get/receive file “Time1” file.
- The platform logs to BAM and reports that the file could not be received.
- The platform polls file “Time2” from the FTP server and it does the same normal scenario as above. The use case ends.
2 - Time message/information from the Time1 file has not full information (less than 24 rows). The file is supposed to have 24 rows (for 24 hours).
- The platform logs to BAM and reports that there is missing information on the message.
- The platform gets/polls instead the “Time2” file from the FTP server and it does the normal scenario.
- The use case ends.
3- The platform can find/get neither file “Time1” nor “Time2”.
- The platform alarms to BAM that it could not get/find the files.
** I am considering either the pick activity or the switch activity solution. Does any one of you have an idea how to design this in oracle BPEL process?
Thanks.

Answer 1

Not sure I understand your use case completly so if I'm off track I apploigise.
I think there are 3 ways to solve this. The 3rd may be closest to what you are looking for.
1. Have 2 processes that read into a common area, e.g. database where you can compare. From there you can choose which file to pick. This is high leve but I think this would be dificult to implement.
2. Implement a combination of a rejectedMessage handler and error processing witn the BPEL process itself. The rejecte message handler can call another BPEL process if the time1 file is in a invalid state. This process will then read the time2 file. The issue with this is that the rejecte message handler will only get invoked when the file doesn't conform to the schema.
3. Use the quarts scheduler whcih invokes a BPEL process every 15 miniutes. Using the file adapter to perform a synchronous read to read time1, analyse it, if it fails read time2 using synchronous read. Then perform the approprate action id this fails.
hope this give some ideas.
cheers
James