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https://issues.apache.org/jira/browse/MINIFICPP-403?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aldrin Piri resolved MINIFICPP-403.
-----------------------------------
Resolution: Fixed
Assignee: marco polo (was: bqiu)
Fix Version/s: (was: 1.0.0)
0.5.0
> Enable tagging of flowfiles with flow metadata information in C++
> -----------------------------------------------------------------
>
> Key: MINIFICPP-403
> URL: https://issues.apache.org/jira/browse/MINIFICPP-403
> Project: NiFi MiNiFi C++
> Issue Type: Improvement
> Affects Versions: 1.0.0
> Reporter: bqiu
> Assignee: marco polo
> Priority: Minor
> Fix For: 0.5.0
>
>
> Provide framework level support to tag flowfiles with metadata about the flow
> that created them.
> Design proposal
> Right now, MiNiFi support core attributes like
> // FlowFile Attribute
> enum FlowAttribute {
> // The flowfile's path indicates the relative directory to which a FlowFile
> belongs and does not contain the filename
> PATH = 0,
> // The flowfile's absolute path indicates the absolute directory to which a
> FlowFile belongs and does not contain the filename
> ABSOLUTE_PATH,
> // The filename of the FlowFile. The filename should not contain any
> directory structure.
> FILENAME,
> // A unique UUID assigned to this FlowFile.
> UUID,
> // A numeric value indicating the FlowFile priority
> priority,
> // The MIME Type of this FlowFile
> MIME_TYPE,
> // Specifies the reason that a FlowFile is being discarded
> DISCARD_REASON,
> // Indicates an identifier other than the FlowFile's UUID that is known to
> refer to this FlowFile.
> ALTERNATE_IDENTIFIER,
> MAX_FLOW_ATTRIBUTES
> };
> So one approach is in the flow YAML file, specific the list of core flow
> attributes along with the processors that inject/import/create the flow files.
> When flow was created/imported/injected by this processor, we can apply these
> core attributes to the new flow.
> Also user can define their own core attributes template and EL for populate
> value for these core attributes, for example protocol, TTL, record route
> (expected route), key, version, etc.
> In current implementation, FILENAME, PATH and UUID are required attributes
> when flow was created, others are optional
> // Populate the default attributes
> addKeyedAttribute(FILENAME,
> std::to_string(getTimeNano()));
> addKeyedAttribute(PATH, DEFAULT_FLOWFILE_PATH);
> addKeyedAttribute(UUID,
> getUUIDStr())
> So if user specify the optional meta flow info section for the processor with
> the key/value pairs as above, MiNiFI will add these key attributes to the
> flow when flow was created by this processor.
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