What is stateful and stateless message processing

What is stateful and stateless message processing ?
When it is used ?

Hi
Before going to Statefull or Stateless...u have to know about java and EBJ and what is session as well.
Basically we are using 2 S in EBJ.It is nothing but persistance of data.
Statefull: It means data are persists in multiple sessions.
Stateless: It means data are persists in single session.
in simple terms
if you use BPM in your integration scenario then it is stateful.
without BPM can be considered as stateless.
Business Process Management provides SAP Exchange Infrastructure with functions for stateful message processing: The status of an integration process is persisted on the Integration Server. This means that you can specify how long an integration process must wait for further messages to arrive, for example. Furthermore, this enables you to process messages within an integration process further still; for example, you can collect certain messages and then send them in a particular order.
This basically means SAP XI as a EAI tool without the BPM provides stateless message. this means that one message coming in SAP is not dependtent on another message.
BPM in SAP XI is used to make messages stateful and this allows us to do functionalities like collecting message , splitting message, waiting for a message etc.
Refer
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/5c656a9d-0901-0010-bcaf-fed14210c991#q-16
http://help.sap.com/saphelp_nw04s/helpdata/en/93/33b504f33cb9468bf35f8fbda11294/frameset.htm
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/5c656a9d-0901-0010-bcaf-fed14210c991
thanks
Swarup

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How to get stateful and stateless session bean in second jsp

I create stateful session bean in the first jsp, then how can I get the stateful session bean in the second jsp? I find that somebody store the bean in HttpSession.
If I store the stateful session bean in HttpSession, then I can get it in the second jsp. My problem is that I can store the stateless session bean in HttpSession, and get it in the second jsp. Then, both stateful and stateless can maintain the state in the second jsp. What is the difference between stateful and stateless session bean in this case ?
I understand the definition of stateful and stateless session bean, but I'm confuse how to use session bean. Can anyone provide sample jsp to show difference of stateful and stateless? How the stateful session bean can maintain the state for the client?

Greetings,
I create stateful session bean in the first jsp, then how can I get the stateful session bean in the
second jsp? I find that somebody store the bean in HttpSession.Which is the correct scope for sharing client-specific data when 'request' scope is insufficient.
If I store the stateful session bean in HttpSession, then I can get it in the second jsp. My problem is
that I can store the stateless session bean in HttpSession, and get it in the second jsp. Then, bothWhy is that a "problem"? Does your application not require the stateless bean to be shared? If so, then don't store the EJBObject reference in the session...
stateful and stateless can maintain the state in the second jsp. What is the difference betweenWhat do you mean by this exactly?..
stateful and stateless session bean in this case ?Statefulness of session beans is in regard to maintaining client state (er, in all cases). If your "stateless" bean is receiving information from the client (i.e. its caller) - either through a create method or a business method - and that information is available (retrievable from the bean) on subsequent method calls, then that bean is, in fact, stateful - regardless of how it is deployed.
I understand the definition of stateful and stateless session bean, but I'm confuse how to use
session bean.The correct question, it here seems, is "when" to use which type... Use a "stateful" bean when information about (from) the client (i.e. the caller) must be maintained across method calls of the bean. Use a "stateless" bean for general business methods that do not depend on "prior knowledge" of the client (i.e. the caller).
Can anyone provide sample jsp to show difference of stateful and stateless? How the statefulA "sample JSP" would yield nothing additional... The semantics of calling, using, and "persisting", bean references are always the same - regardless of type or class. However, the reason(s) for using one over the other depends entirely on the needs of your application.
session bean can maintain the state for the client?I recommend that you spend more time learning about EJBs generally. In particular, it seems you require more fundamental understanding of their scope and lifecycle. Refer to sections 4, 6, and 7 of the EJB 2.0 Specification.
Regards,
Tony "Vee Schade" Cook

Difference between stateful and stateless session beans

can any body explain simply what is the difference between stateful and stateless session beans? also in what kind of situations we can use these.

Hi
This is the classificatio os Session Bean.
(1) Statfull
(2) Stateless
Stateful means u will persists the state of the object.
USESE:
In a Banking system u can use the statful session just for maintaing the
state.
(2) STATELESS: that's mean u do't want to persists any state of the object. that's mean a single Request is coming ,do the desire and give the output.
EX: A Credit Card System is the Example of Stateless.
May it will helpfull to understands u. if any need write here
saM

GetUserPrincipalName() and mixing between stateful and stateless

I am using VPD, BC4J and the Struts version included in JDEV 9.0.3 final version.
When I am calling
String userName = getUserPrincipalName();
from ApplicationModuleImpl it works fine as long as I am using stateful for all BC4J viewobjects, but when I am mixing between a stateful and stateless application module, getUserPrincipalName() will return the previous users principal.
An Example that will cause this problem:
User 1: Goes to a web page using a stateful AM
User 1: Goes to a web page using a stateless AM
User 2: Goes to a web page using a stateful AM
when user 2 goes to a stateful page he will retrieve
user 1's principal.
My questions are:
1) Does getUserPrincipalName() only work under stateful?
2) Does a struts application using stateful application module lose stateful state after calling a stateless application module?

Ahhh forgot to add something...
if you want to keep your existing exception hirarchy (ABCException extends RemoteException).
then make sure that in your statefull session bean the order of the catch block is first the catch(ABCException) and then the remote exception.
If the catch block for remote exception comes first, then the ABCException will be sent to that block itself because ABCException is a sub class of remote exception.
However, IMHO, business exceptions should not extend the remote exception... as the RemoteException is used to report technical errors and not business errors.
hope this helps ....
regards,
Abhishek.

Stateful and Stateless BSP Application

Hi Experts,
I would like to know what a stateful/Stateles BSP Applicaiton means. I read the description given in help file but couldn't get the full idea behind it. Could anyone give a practical example for the same and explain. Thanks.
Regards,
Prabaharan

Hi,A stateful BSP application is executed like a normal SAP transaction, independent of all user interactions - in one single context (roll area). This means that data specified by the user during the application execution or data determined by the application itself is available potentially throughout the entire execution duration of the session.
Since the HTTP protocol itself operates in stateless mode and knows no implicit mechanism to assign independent requests to a common logical session, the BSP runtime uses Session Cookies to group requests into one common session. The name of the cookie is sap-contextid, the validity area is restricted to the URL of the BSP application. This means that a BSP application can be executed within a browser only once at any one time. Different BSP applications can operate in parallel in the same browser. Multiple users/browsers can execute the same BSP application in parallel as often as required.
Advantage
The main advantage of stateful BSP applications is that they are simple to program. As usual, you have access to data determined previously and reading or re-calculating data can often be omitted. For database-intensive applications, this can lead to considerably better system performance compared to a procedure where identical read operations have to be executed for every request.
Disadvantage
This significant advantage is at the same time however a disadvantage the improved runtime is offset by a larger memory requirement. The number of possible parallel sessions in an SAP Web Application Server is restricted not least by the amount of available memory space. When this space is exhausted, no further sessions can be started and users cannot log on
Stateless BSP applications only block resources on the SAP Web Application Server during the time one single request is being processed. When the request has been processed, all resources in particular the application context are returned to the system for use in other requests.
Stateless applications allow - at least from the viewpoint of the memory resource optimal scaling regardless of the number of users. On the other hand, releasing the application context after every request may mean that identical data is read from the database and formatted multiple times. In this respect, the runtime may offset the memory saving. This should be evaluated and analyzed on a case by case basis.
Rule of Thumb: Stateful or Stateless?
As a rule of thumb, it is recommended that Internet scenarios used at the same time by a large number of users operate in stateless mode. Stateful programming is recommended for more complex applications that are used by a limited number of users in parallel and that operate with data that is expensive to determine.
hope this helps.
regards,
keerthi.

Stateful and stateless firewall

ASA5505 has a feature of "Stateless Active/standby" HA? What is the meant of stateless? And what is the meant of "stateful firewall". Thanks

Hi Eric
To answer the 2nd part of your question.
A stateful firewall keeps track of the "state" of connections based on source/destination IP, source/destination port and connections flags. It can really only keep state for TCP connections because TCP uses flags in the packet headers. eg
When a client telnets to a server.
Client address = 192.168.5.1
Server address = 172.16.5.2
The client picks a random port eg 33212 and sends a packet to the server
source IP = 192.168.5.1
source port = 33212
destination IP = 172.16.5.2
destination port = 23 ( 23 is telnet port )
TCP Flag = SYN
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source IP = 172.16.5.1
source port = 23
destination IP = 192.168.5.1
destination port = 33212
TCP FLAG = SYN/ACK
Client responds
Same as original client packet except
TCP FLAG = ACK
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Now lets say there is a stateful firewall in between the client and the server.
When the firewall sees the initial packet from the client it records all the info above.
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Now lets say the client hasn't sent an intital packet and the server sent a packet with the same info as above. The TCP FLAGS are SYN/ACK but the firewall has no record of a SYN packet sent from the client. So the packet is dropped.
In essence this is how stateful firewalls work . They keep track of each connection and allow the traffic to flow through only if there are corresponding entries in it's state table.
For non-TCP protocols eg UDP there are no flags so the stateful firewall sets a timer ie. if it sees a DNS query go out it records the IP source/destination and the Port source/destination. If within a certain amount of time a packet is received back with the same IP'S and port number, although obviously the source and destination are flipped, the packet is allowed through.
Hope this makes sense
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What are Swift_payload and Swift_par messages?

Hi All,
I want to know why there are two messages in Swift interfaces Swift_payload and Swift_par?. In standard file act interface Swift_payload_par gets splitted into these two messages.
Can anyone please tell me the significance of this splitt? Also why payload is genrated first follwing it the par?
Thanks
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After Splitting the file, the payload file will be PGP encrypted before sending to SWIFT.
I have created one sender File communication channel to pick input file generated by SAP BCM which they place in our system landscape directory.
Have used the adapter module: localejbs/swift/FileActConversionToSWIFTModule
Parameters: DetachParameters - true
I have created two receiver FILE communication channels, one for payload file and the other for .par file to send these files to SWIFT.
Payload receiver channel
Have used the adapter module: localejbs/swift/FileActConversionToSWIFTModule
Parameters: DetachParameters - true
Parameter receiver chanel
Have used the adapter module: localejbs/swift/FileActConversionToSWIFTModule
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Stateful message processing for async scenario

Dear all,
my async scenarios:
1. RFC -> PI -> File
2. File -> PI -> RFC
Following facts:
- The second message is a response to the first one. Both message are separted and async.
- Scenario 2 can be send some hours after Scenario1.
- A response should only be send if a specified field in the message of first scenario is filled.
For example: Message in scenario has a field <ResponseNeeded>YES</ResponseNeeded>
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corresponding message.
Questions:
- Is it possible to use stateful message processing for this scenario? Or do I need BMP + Correlation?
- A service interface with pattern "stateful" can only be used synchronously. So is it
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response will be sends with same ID. After this I would check message of scenario1 and
send (or even not) the message of scenario2 to receiver depending on <ResponseNeeded>.
Thanks in advanced.
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Hi Chris,
Although BPM is possible here, I would not recommend you to use one here for the reason,
>>Scenario 2 can be send some hours after Scenario1.
This means you are keeping a process alive for so long which is not a good thing to do.
You could end up with a lot of open/live process instances.
Having said that, if you still wish to go ahead with BPM, the steps would be
1. Receive async (RFC req) - start process, correlation based on ID.
2. Switch step (Evaluate ResponseNeeded)
branch 1(True): a. Send asynch step - File
b. Receive async - File correlation - ID.
c. Send async - RFC call.
branch 2(false) a. Send async -File
3. Stop process.
Regards
Jai

Stateful vs Stateless

Hello,
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Chris

hi,
stateless session cannot maintain the state of the client i.e between the method calls no client inforamation is retained. once the request is processed the container may remove the bean from the memory or it maintain the bean in the pool in order to process the requests that are coming from other clients for the same.
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....code
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public void ejbCreate()
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v.addElement(item);
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1.
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It was an error in the SourceCode and is now corrected by SAP:
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"up and running no message processing until now"

Hi,
I am doing a multiline scenario with File Content Conversion. In Adapter Monitor, Message is processed in the sender CC and in the Receiver CC it shows "up and running no message processing until now"
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hi,
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Regards,
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<a href="/people/michal.krawczyk2/blog/2005/06/28/xipi-faq-frequently-asked-questions"><b>XI / PI FAQ - Frequently Asked Questions</b></a>

What is stateful and stateless message processing

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