Work Manager and the Invocation Service - Items Queued?

Hi,
After reading the user guide & javadocs and searching this forum, I can't find documentation on how an Invocation Service works behind the scenes. I'm implementing a WorkManager (which sits atop an incovation service) with the goal of using some nodes in my Coherence cluster as essentially a distributed thread pool for parallel execution of work.
I want to know:
a) How work items are queued when all threads dedicated to the WorkManager are in use. I assume a cache is spawned to handle this, but if a queue is used, how do I configure the depth?
b) Can thread count be throttled dynamically? The post linked below seems to have tried it, but is there no cleaner way since the service is configured prior to startup? Maybe this has changed since 3.4.
How Can a Service's Configuration Be Modified Dynamically
Thanks

To answer Luk's question - yes the change in thread count took affect without me having to restart the service. I have only changed cache service thread counts via JMX but I assume invocation services would be the same.
Roberto,
Regarding the queue size - I suspect this is limited by the amount of heap your process has. Presumably Coherence uses some sort of queue structure internally to hold the requests and this is likely only limited by memory - or maybe number of entries if it uses an int for its size.
I am sure if you try hard enough you could blow the queue size if you could somehow push a sufficiently large number of slow running tasks into the server and even eaiser if your invocables contained a lot of data themselves so they took up more heap.
It would be very simple to write a test the just fires in invocables at a fast enough rate and see what happens.
JK

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Flow is PS_C--->BS_A (based on PS_A)
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@Anuj: Thanks for links, I am having a look..
Use case:
What is the target app/service? Is it DB, HTTP or anything else?
Back end: Amadeus web services
Role of DB:
1. It will store data to attach transaction context to a request. This is to call more than one services in the backend - it is necessary for backend to understand in which context services are being invoked.
For example, if I need to make PNR related changes, I need to invoke service X and fetch transaction context from back-end. The transaction specific identifier (read session) will be received in header part. After retrieve suppose I need retrieve PNR, I will invoke service Y. When I invoke, I need to put the transaction specific header part received in response of service X and then change body as per request format of service Y (read the response header of X will be the same as request and response header of Y) which will actually make changes and commit in the backend. (So back-end will understand that service X and Y are invoked as a part of single transaction, and transaction can be identified through logs)
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2. My PS_A is proxy which orchestrates these operations. (Read: SelectandUpdateDBForSessionRetrieve, UpdateDBWhenTransactionOver functionaries) Since there are two admin and four managed servers, all copies of PS_A will try to access DB simultaneously, and concurrency will fail.
3. Hence I made BS_A on the basis of PS_A. BS_A is deployed on all four managed servers, used Load Balancing Algorithm as "None" and gave hard-coded urls of four managed servers in sequence of MS1, MS2, MS3 and MS4.
4. Idea is if MS1 is ok, all requests will go to BS_A of MS1 only, and if somehow if I make it single threaded *(Read from DB+mark retrieved data as "in use" so other request can not use it)*, concurrency issue will not arise. In case MS1 is down, the requests will automatically forwarded to MS2 and since that is also single threaded, concurrency issue won't arise. In short both fail-over and concurrency can be achieved with BS_A making out of PS_A.
The problem as you have correctly pointed out, is that OSB is stateless and one request has no relation with another. Somehow, I need to make every retrieve/update/insert to database as single threaded, i.e. once one is done then another should not be done at the same time. Else entire point of this pooling will fail.
Please share any thoughts you might have. Even another approach to handle this single threaded need will do.
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Swapnil Kharwadkar

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Work Manager and the Invocation Service - Items Queued?

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