Adding parameters to delay file processing in specific cases

[ljuillerat]

Purpose

Resolves some use cases where file transfer must be timed out. Especially where file content is not consistent or file not finalized to be retrieved.

Goals

2 additional properties are added to the VFS transport listener to manage:

• Empty files (boolean to state if they need to be read or not)
• Files that are not complete and where content is still changing by the time (we can define a value which is telling the check delay in ms). As long as these files are changing, they will not be picked up.

Samples

To ignore empty files, parameter has to be added to listening proxy:
<parameter name="transport.vfs.CheckSizeIgnoreEmpty">true</parameter>

To check if file is still uploading, we have to add this parameter to listening proxy:
<parameter name="transport.vfs.CheckSizeInterval">100</parameter>

[CLAassistant]

All committers have signed the CLA.

[arunans23]

Thank you for your contribution. It seems this PR has some conflicts. Can you resolve them to merge the PR?

[ljuillerat]

Building CI seems failing but for external reasons. Would it be possible to have a look ?

[arunans23]

Thank you for addressing the review comments. Created a doc issue to track the doc changes. wso2/docs-mi#809