Reading url from REST sender adapter

[Former Member]

I am facing error when i try to read the value from url of sender REST adapter

I followed this blog.

http://host:port/RESTAdapter/Hub/Employee/<employeenumber>

here this part employeenumber is dynamic.

When I run the interface, I am not getting the correct rsponse. If I hard code in the mapping the input value, I get the correct response so something wrong with my code.

this is the code i used

public String getASMA(String namespace, String attribute, Container container) throws StreamTransformationException{

Map<String, Object> all = container.getInputHeader().getAll();

            DynamicConfiguration dynConf = (DynamicConfiguration)all.get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);

            DynamicConfigurationKey key = DynamicConfigurationKey.create( namespace, attribute);

            String value = dynConf.get(key);

            return value;

}

in mapping I did like this

two constants mapped to udf at input side and the output mapped to the value that i need to fill

first constant is employeenumber

second constant is http:// sap.com/xi/XI/System/REST

what is the wrong? I am entering two constants

[vadimklimov · Accepted solution]

Hello Midhun,

Please have a look into this blog post - it contains details about configuration of REST sender communication channel and mapping, that fulfils your requirement.

Few checks to be verified:

1. In REST sender channel: on "REST resources tab", did you specify URL pattern and mapping from custom attribute to PI dynamic attribute correctly? Variables in URL pattern shall be surrounded by curly brackets. For example, in a URL you provided above, URL custom pattern shall be /Hub/Employee/{employeenumber}, assuming employeenumber is a variable that you then map to a dynamic attribute (based on your description, having identical name).

2. Can you ensure a message gets corresponding custom dynamic attribute created and populated? For a processed message, please check its message attributes in Message Monitor > Message Versions (available by clicking a button "Open Message"). On the tab "Message Attributes", can you see an attribute "employeenumber" and a valid value assigned to it?

Regards,

Vadim

[Former Member · Accepted solution]

It's an RFC at the receiver side, so I am not able to check where to find the hits. RFC is not visible in MONI

I did this way

Channel Selection Tab

Specify Endpoint was ticked

Then in REST Resources tab

URL custom pattern is {employeenumnber}

Under that, XI Dynamic Attribute

dynamic Attribute REST id id

Value Source URL Pattern Element

Pattern Element employeenumber

Employeenumber value is then mapped to EMPNR in the RFC

I have given two inputs, to RFC, one is xi/sytem and the other is id

I am now getting output

irrespective of what i give i am getting output of one value 10001

The response always gives that even if i give 10002 in the url

[vadimklimov · Accepted solution]

Midhun,

Give a try to a following configuration of a channel (similar configuration works well for me):

(adopt a fixed part of an endpoint based on your needs - but looking to a URL you provided in your first post, it shall be provided as well)

Regards,

Vadim

[Former Member · Accepted solution]

I changed it to how you said.

Left the Channel selection tab blank

Now I am getting this eror

Parsed attribute "id": "100021"

Processing HTTP call: GET http://xxxxxxx:51000//Hub/Employee//100027

Even though I am sending the employee number 100027, it's parsing 100021 and fetching the details of the employee 21 from the ECC system.

Irrespective of whatever value I send in the url, I am getting the details of 10021

I used 100014, 100015 etc

[Former Member · Accepted solution]

Vadim

It's not working

Under REST resources tab, the moment i change rest id (id) frm Dynamic Attributes,

I am nnot able to get back anything. It just get a blank namespace of receiver as response

[vadimklimov · Accepted solution]

Midhun,

In an error message, I see two slash symbols in a called URL (before "100027"). Can you please check that and ensure you don't have typos when calling URL on a client side.

For REST sender configuration, please try to switch from "REST ID (id)" to "Custom Attribute" in order to me able to map custom attribute name ("employeenumber" in your case). When using custom attribute option, you will be able to map arbitrary name of an attribute you used in URL, with PI dynamic attribute.

Regards,

Vadim

[Former Member · Accepted solution]

Hi Vadim

It worked and many thanks.

My mistake was this. I was using CustomAttribute under the XI Dynamic Attributes. I gave CustomAttributeName and PatternElement ad "EmployeeNumber"

In the mapping, I used dynamic configuration. GetASMA. I gave two constants as inputs. The first was http://sap.com/xi/XI/System/REST and the second was "id". I saw in message attributes of the payload that the value passed is held in EmployeeNumber

I gave the attribute input for the udf as EmployeeNumber, and now it's working

Thanks a ton

[Former Member · Accepted solution]

Under XI Dynamic attributes, if you are using the Dynamic attribute as REST id (id), then we need to give the input for the dynamic configuration udf in message mapping shoulod be as the following

1) http://sap.com/xi/XI/System/REST

2) id

then also it will work

[former_member186851 · Accepted solution]

Nic to Hear Midhun.

[former_member201275 · Accepted solution]

Hello Vadim,

Do you perhaps still have the link for the 'REST adapter - using dynamic attributes', as above? The link above is old and does not work anymore. 😞

[vadimklimov]

Hi Glen,

Yes, thank you for pointing this out - the location of the blog post that I referred to, got changed. Here is a current link to that blog post: https://blogs.sap.com/2014/12/18/pi-rest-adapter-using-dynamic-attributes/.

Regards,

Vadim

[former_member186851]

Midhun,

So ur keeping emp No dyanmic and also u wish to get the URL in the mapping?