Hello,
I have a mod_perl application that takes a request from a client, then does
some transaction processing with a remote system, which then returns a
success/fail result to the client. The transaction MUST happen only ONCE per
client session.
PROBLEM: the client clicks the submit buttom twice thus sending two
requests, spawning two different processes to do the same remote
transaction. BUT, the client request MUST be processed only ONCE for a given
session_id. The first request will start a process to initiate the remote
transaction, and then the second request process start, not knowing about
the first process. The result is that the client has the transaction
performed two times!
How do you handle this? My first thought is to write a "processing status"
value to the session hash (using apache::session) AS SOON as the first
request is received, and then when the second duplicate request is received,
check the "processing status" in the session hash. If the processing status
is "in progress", then wait till the processing status in the session hash
is updated by the first request process and return the result.....
Is my concept on target? Is my implementation right? (or should I write
directly to the files system?)
Does anyone have any experience with such things? Can you give me your
wisdom?
Keith
