Parforeach

[Former Member]

Can anyone explain when we will use Parforeach and Foreach with some example and the difference between them?

[Former Member]

Hi naresh,

I have got the below doc in Sap Help. take a look.

Mode

In a dynamic mode, the block is executed for each line of a multiline container element. In ParForEach mode, an instance of the block is generated for each line of the multiline container element. All instances are processed simultaneously. In ForEach mode, the block first runs through for the first line of the multiline container element, then for the second, and so on.

You can use the ParForEach mode when you want to send a message to multiple receivers simultaneously, for example. To do so, you use a receiver determination step to determine a multiline container element with the list of receivers. You then define that the message is sent to these receivers in a block with the ParForEach mode. You can use the ForEach mode when you want to send a message to multiple receivers one after the other, for example.

You specify the multiline container element in the Multiline Element attribute. In the Current Line field specify a container element that takes the value of the multi-line container element for which the block will run.

You can define an end condition for the dynamic mode (see also: Condition Editor). This is checked as soon as the block has run through for one line of the multiline container element. The block is complete as soon as one of the lines of the multiline container element returns true for the end condition, or all lines of the multiline container element have been processed.

More information: Checklist: Making Correct Use of a ParForEach

--Sankar Choudhury

[Former Member]

Hi,

We can define the mode Parallel For Each (ParForEach) for a block or Dynamic Sequence (ForEach). This means that the block is executed for all elements of a multi-line container element.

In ParForEach mode, an instance of the block is generated for each line of the multiline container element. All instances are processed simultaneously.

In ForEach mode, the block first runs through for the first line of the multiline container element, then for the second, and so on.

regards,

arijit

[Former Member]

Hi naresh,

While Designing Integration Process in IR we may use block in Default or ForEach or ParForEach mode.

When we use block in ForEach or ParForEach mode it means the block will work dynamically.

In any of these two case you will get two extra properties in a block those are: MultiLine Element and Current Element.

In Dynamic mode we send a msg through a block by send step and receive response by the receive step.

So here the block waits for a response for the msg sent.

If you use ForEach then the block will send msg only after it receives a response.

and in ParForEach the block will send all messages parallely without waiting for one's response.

Please reward points if helpful.

---Sankar Choudhury

[aashish_sinha]

Hi,

ParForEach

You have the option of choosing a dynamic processing mode for a block. The following considerations will help you to decide which mode is appropriate for your particular use case.

ForEach or ParForEach?

A ParForEach is not a means of improving performance. A ParForEach will not result in a split into threads.

A ParForEach has a high resource consumption rate because one work item is created for every loop.

ParForEach Recommended

A ParForEach is recommended if:

● The messages are processed further in the parallel processing branches.

● The individual processing branches are not dependent on each other on a business level.

● The number of parallel processing branches is less than 999 (the multiline table element that is processed in the ParForEach contains less than 999 lines).

A ParForEach would be beneficial in the following example:

You want to send a message to multiple receivers, wait for the respective answers, and then edit each one independently of the others in a separate context. Once the messages have been sent asynchronously in the ParForEach, the step can wait for an acknowledgment or some kind of business confirmation, for example.

ParForEach Not Recommended

A ParForEach is not recommended if:

● The messages are not processed further in the processing branches.

If, for example, you want to send a message to multiple receivers, but do not want the step to wait for a response or acknowledgment, use a ForEach instead of a ParForEach.

● There are more than 999 processing branches.

Check whether you can use a ForEach instead of a ParForEach. In the case of a ForEach you can set the maximum number of processing branches as part of the absolute upper limit (transaction SWPA). The absolute upper limit is set to 999999.

ForEach

is maily used in places where sequencial processing is important or the order of the message has to be preserved by executing

Hope this will help you.

Regards

Aashish Sinha

PS : reward points if helpful

[Former Member]

Hi

parfor each and for each are used in block step

parforeach is used when u want to send the messages parlally

foreach is used when u want to send the messages one by one

for exaple ..3 messages are their if u want to process the 3 messaged parally then u choose parforeach

when u want to send the messages one after the other then u use foreach

thanq

krishna

[Former Member]

Sending messages simultaneously (ParForEach)

Sending messages one after the other (ForEach)

[former_member238007]

Hi,

It will come the block step is it right if it is follw this ...

In a block with a ParForEach, the elements of a multiline container element are processed in parallel instances of the block at runtime. If a send step within the ParForEach sends a message, and a separate message is to be received for this message for each element of the multiline container element, then the send step can activate the corresponding correlation.

You use a block ( ) to combine steps that you want to execute one after the other and which are to access the same local data . You can also use a block to combine steps that you want to have the same deadline or exception handler, or to define a local correlation.

You can define the mode Parallel For Each (ParForEach) for a block or For Each (ForEach). This means that the block is executed for all elements of a multi-line container element.

regards,

Kishore