Is there a way to discard an empty message?
I have a misbehaving HTTP endpoint which is causing me to get intermittent empty messages going through the flow.
These end up clogging up the logs.
It would be good if I could detect empty messages in the flow and discard them before they affect anything downstream
Best answer by lohith
If the REST connector produces an empty file without any contents, you can use the fileread() operation to check if the file contains content or not with the following script. You can then branch them appropriately using a branch connector based on the header:
<arc:set attr="file.file" value="[filepath]" />
<arc:call op="fileRead" in="file" out="result" >
<arc:if exp="[result.file:data | equals('')]">
<arc:set attr="output.header:Empty" value="Yes" />
<arc:else>
<arc:set attr="output.header:Empty" value="No" />
</arc:else>
</arc:if>
</arc:call>
<arc:set attr="output.FilePath" value="[FilePath]" />
<arc:push item="output" />Additionally, you can write the script based on file size as well.
There are generally two approaches here:
I think Russell needs a script that checks the file length.
If length > 0 continue, if length = 0 ignore and/or send to dead-end-connector.
If the REST connector produces an empty file without any contents, you can use the fileread() operation to check if the file contains content or not with the following script. You can then branch them appropriately using a branch connector based on the header:
<arc:set attr="file.file" value="[filepath]" />
<arc:call op="fileRead" in="file" out="result" >
<arc:if exp="[result.file:data | equals('')]">
<arc:set attr="output.header:Empty" value="Yes" />
<arc:else>
<arc:set attr="output.header:Empty" value="No" />
</arc:else>
</arc:if>
</arc:call>
<arc:set attr="output.FilePath" value="[FilePath]" />
<arc:push item="output" />Additionally, you can write the script based on file size as well.
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.
