[ 
https://issues.apache.org/jira/browse/METRON-777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16118849#comment-16118849
 ] 

ASF GitHub Bot commented on METRON-777:
---------------------------------------

Github user ottobackwards commented on a diff in the pull request:

    https://github.com/apache/metron/pull/530#discussion_r131999633
  
    --- Diff: 
bundles-lib/src/main/java/org/apache/metron/bundles/bundle/Bundle.java ---
    @@ -0,0 +1,48 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You under the Apache License, Version 2.0
    + * (the "License"); you may not use this file except in compliance with
    + * the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +package org.apache.metron.bundles.bundle;
    +
    +/**
    + * Represents a bundle that contains one or more extensions.
    + */
    +public class Bundle {
    +
    +    private final BundleDetails bundleDetails;
    +
    +    private final ClassLoader classLoader;
    +
    +    public Bundle(final BundleDetails bundleDetails, final ClassLoader 
classLoader) {
    +        this.bundleDetails = bundleDetails;
    +        this.classLoader = classLoader;
    +
    +        if (this.bundleDetails == null) {
    +            throw new IllegalStateException("BundleDetails cannot be 
null");
    +        }
    +
    +        if (this.classLoader == null) {
    +            throw new IllegalStateException("ClassLoader cannot be null");
    --- End diff --
    
    @bbende sorry to pull you into the middle of this opus.  I was planning on 
talking to you about this after it passed review and settled a bit.
    
    I *think* there a couple of things in here that may be worth a thought for 
nifi, and my plan is to bring that up later.



> 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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