Idempotent and Non-idempotent activites

Can you give me the examples for Idempotent and Non-Idempotent activities in BPEL also describe them in brief.
Send to my mail id - [email protected]
Regards,
Hrushi.

Activities which can be retried are called idempotent activities. Examples are : assign activity, invoke activity etc. So if the BPEL process is recovered from the dehydration store , then these activities are retried again (idempotent activities are not stored in dehydration store if there is no dehydration activity like checkpoint() ) . Non idempotent activities are those which causes the BPEL process to dehydration and so there state is saved into dehydration store. If the BPEL process is recovered from the dehydration store, these activities are not retried . Examples are : wait activity, mid point receive activity, pick activity , checkpoint() etc.
So when you specify the idempotent property as "false" in the partner link of a BPEL process , this becomes non idempotent and cause the BPEL process for dehydration and so a commit occurs . This is another way of ending the current transaction of a BPEL process and start a new one.
Hope this helps.

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ContinuousQueryCache and non-idempotent Filters

From the documentation I read on the ContinuousQueryCache, I assume that it works in two stages. First, it runs the distributed query based on the given Filter and caches the results. Second, it registers MapListeners that update the query result whenever an underlying cache INSERT, DELETE or UPDATE occurs. This will work fine with idempotent Filter implementations. But this may fail if underlying Filter is allowed to produce different results over time.
To give a concrete example. I would like my cached values to have a Publish Time. My NamedCache would have all values in it. And my Filter would check whether System.currentTimeMillis()>value.getPublishTimeMillis(). I would expect my ContinuousQueryCache to show the values whose Publish Time has arrived reasonably soon after the Publish Time.
Naturally, there may be no UPDATE events that would trigger the Filter to be re-applied as soon as the Publish Time arrives. So, the values would not appear in my ContinuousQueryCache.
One workaround I can think of is to have a refresh() method in my ContinuousQueryCache that I could run on a scheduled basis from a separate thread. Such refresh() method would rerun the underlying distributed query.
Is there such capability? Or is there a better way people typically handle Publish Time? (I realize that I could put a dummy value in cache which would expire at Publish Time and then expect the cache to retrieve the real value via a CacheLoader. But for many reasons, I do not like this approach.)

We are JDK 1.4.2, so no AtomicReferences here :o) But
I get your point.
It is available for 1.4.2 as a separate JAR file, AFAIK.
Look at http://g.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html
In my opinion, CQC would still be preferable because
it uses events to attempt to keep the query result up
to date. This will allow me to run query *less
frequently* than I would have to in your solution.I don't see why. The events will in no case will mirror the passing of time, therefore you will need to rerun the query to get entries which became of age since the last running of the query.
This is keeping in mind that my Filter may be more
complex than just by Publish Time. There may be many
other additional complex conditions.If they can be indexed, that might even help if it reduces the result set size significantly.
>
So, do you think there's a way to rerun the
underlying query ad hoc?
I don't know of one, if it is not in the Javadoc, as the intentional purpose of the CQC is exactly not having to rerun that query. However this does not mean that there is not one.
Best regards,
Robert

What is non-idempotent?

What is non-idempotent?

Hi,
Just to illustrate... Let's say you have two methods... int sumOfTwoNumbers(int n1, int n2)... and int addToGrandTotal(int n2)...
sumOfTwoNumbers will be idempotent, you can pass the same numbers as many times as you want and it will give you always the same result...
addToGrandTotal is non-idempotent as it is adding a value to a grand total that's internal to the class, if called twice it will probably return different results... and alter the internal class value as well...
The concept is important in SOA, because idempotent operations are safer than non-idempotent operations... You can always safely resubmit a message to an idempotent operation, on the other hand you will need to perform every possible check in order to avoid double-submission for non-idempotent operations...
Cheers,
Vlad

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How do i know for sure if someone is accessing my phone and viewing my activities which i think are private

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Dear all,
Is it possible to implement SSO for both SAP and non-SAP applications without involvement of EP at all?
I have gone through this link.
<a href="http://help.sap.com/saphelp_nw04s/helpdata/en/e5/4344b6d24a05408ca4faa94554e851/frameset.htm">http://help.sap.com/saphelp_nw04s/helpdata/en/e5/4344b6d24a05408ca4faa94554e851/frameset.htm</a>
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A client of our's uses SAP Enterprise Portal, and is using the SAP SSO, which is implemented with tickets, and requires the use of SAPSECULIB. My company provides an application for this client, and our application in hosted in our data center for the client, as a Software as a Service application, obviously across the internet. Our client, which owns a SAP license, has asked that we support the SAP SSO as a non-SAP SSO application. The client user's SSO ticket will be created from SAP EP, and then passed across the internet to our application, and we are to use that SSO ticket as an authentication ticket to our application. I beleive I know how to do this work technically, having reviewed the SAP document named: "Dynamic Library for Verifying SSO Tickets in Third-Party Software" Specification Version 2.00 December 2005.
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thanks very much!

Key field
Each condition table contains keys that can be used for creating dependent condition records.
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Please reward points for good answers as this would help increase the total donation that SAP will make to the United Nations World Food Programme.

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Hello
Is there any Std report is there....it can give us the list of Excisable and Non excisable Vendors based on the Perticular Purchase Orgnisation.
Regards
sapman man

Hi
I do not think in SAP this kind of report is available.
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Awaiting your feedback.
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Connect b/w SAP and Non SAP -system

Hi All,
I have a requirement where i need to connect between a SAP system and Non-Sap System.
the front end is an E-Build tool (for construction Industry) from where the user will pick the data and the data should get store at the backend i.e in the SAP system.
E-build is a tool for construction industry with lots of flexible options for the user to check for their house, along with their prices.
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tks.. venkat

Difference between Valuated and Non valuated Sale order stock

Hi All,
Can anybody tell me the difference between the above said subject with the steps involved in each scenario.
That is valuated sale order stock and Non valuated sale order stock in Product cost by Sale Order.
With Journal entries at each step and whether any WIP or variances at Production order level and sale order level and all the financial entries related to them
Thanks in Advance,
Ravi Kumar

Hi Shail,
Thans for your inputs,
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Thanks & Regards,
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Idempotent and Non-idempotent activites

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