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https://issues.apache.org/jira/browse/METRON-777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16103100#comment-16103100
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ASF GitHub Bot commented on METRON-777:
---------------------------------------
Github user ottobackwards commented on the issue:
https://github.com/apache/metron/pull/530
```code
-------------
To have a single lib, some things that were in other nifi libraries had to
be relocated.
./bundles:
ExtensionManager.java -> MODIFIED
NarClassLoader.java -> BundleClassLoader.java
NarThreadContextClassLoader.java -> BundleThreadContextClassLoader.java
ExtensionMapping.java -> MODIFIED
NarClassLoaders.java -> BundleClassLoaders.java
NarUnpacker.java -> BundleUnpacker.java
InstanceClassLoader.java -> MODIFIED
NarCloseable.java -> BundleCloseable.java
NarManifestEntry.java -> BundleManifestEntry.java
NotInitializedException.java -> CREATED
ExtensionClassInitializer.java -> CREATED
./bundles/bundle
MOVED FROM nifi-framework-api/src/main/java/org/apache/nifi/bundle/ into
this library
./bundles/annotation/behaviour
MOVED FROM
nifi-api/src/main/java/org/apache/nifi/annotation/behavior/RequiresInstanceClassLoading.java
into this library
./util:
BundleProperties.java -> MOVED FROM
/nifi-commons/nifi-properties/src/main/java/org/apache/nifi/util/NiFiProperties.java
VFSClassloaderUtil.java -> CREATED FROM
/metron-stellar/stellar-common/src/main/java/org/apache/metron/stellar/common/utils/VFSClassloaderUtil.java
BundleUtil.java -> CREATED
StringUtils.java -> MOVED FROM
nifi-commons/nifi-properties/src/main/java/org/apache/nifi/util/StringUtils.java
// I created an interface for FileUtils, and made the FileUtils front two
possible implementations, a VFS on and an HDFS one, because of the differences
required writing to HDFS
FileUtils.java -> MODIFIED
FileUtilities.java -> CREATED
HDFSFileUtilities.java -> CREATED
VFSFileUtilities.java ->CREATED
--
```
> Create a plugin system for Metron based on 'NAR'
> ------------------------------------------------
>
> Key: METRON-777
> URL: https://issues.apache.org/jira/browse/METRON-777
> Project: Metron
> Issue Type: New Feature
> Reporter: Otto Fowler
> Assignee: Otto Fowler
>
> The success of the Metron project will be greatly dependent on community
> participation, and with that the ability to adapt and extend Metron without
> having to maintain a fork of the project.
> As organizations and individuals look to extend the Metron system with custom
> parsers, enrichments, and stellar functions that may be proprietary in
> nature, the ability to develop and deploy these extensions outside the Metron
> code base is critically important.
> To that end, and after community discussion and proposal we create or
> formalize the 'plugin' development story in Metron.
> The proposal is to adapt the Apache Nifi NAR system for use in Metron. This
> will provide the system with:
> * archetype(s) for developer projects and independent development
> * defined packaging and metadata for 'plugin' products
> * loading and instantiation with classloader isolation capabilities
> * removing the necessity for shading plugin jars
> These capabilities will also enable other features, such as plugin lifecycle,
> plugin configuration+redeployment, and other things.
> The plugin archetypes and their installation will be a followon
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