[ 
https://issues.apache.org/jira/browse/METRON-777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16118732#comment-16118732
 ] 

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_r131983133
  
    --- Diff: 
bundles-lib/src/main/java/org/apache/metron/bundles/bundle/BundleDetails.java 
---
    @@ -0,0 +1,189 @@
    +/*
    + * 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;
    +
    +import org.apache.commons.vfs2.FileObject;
    +
    +import java.text.ParseException;
    +import java.text.SimpleDateFormat;
    +import java.util.Date;
    +
    +/**
    + * Metadata about a bundle.
    + */
    +public class BundleDetails {
    +
    +    private final FileObject bundleFile;
    +
    +    private final BundleCoordinate coordinate;
    +    private final BundleCoordinate dependencyCoordinate;
    +
    +    private final String buildTag;
    +    private final String buildRevision;
    +    private final String buildBranch;
    +    private final String buildTimestamp;
    +    private final String buildJdk;
    +    private final String builtBy;
    +
    +    private BundleDetails(final Builder builder) {
    +        this.bundleFile = builder.bundleFile;
    +        this.coordinate = builder.coordinate;
    +        this.dependencyCoordinate = builder.dependencyCoordinate;
    +
    +        this.buildTag = builder.buildTag;
    +        this.buildRevision = builder.buildRevision;
    +        this.buildBranch = builder.buildBranch;
    +        this.buildTimestamp = builder.buildTimestamp;
    +        this.buildJdk = builder.buildJdk;
    +        this.builtBy = builder.builtBy;
    +
    +        if (this.coordinate == null) {
    +            if (this.bundleFile == null) {
    +                throw new IllegalStateException("Coordinate cannot be 
null");
    +            } else {
    +                throw new IllegalStateException("Coordinate cannot be null 
for " + this.bundleFile.getName());
    +            }
    +        }
    +
    +        if (this.bundleFile == null) {
    +            throw new IllegalStateException("Working directory cannot be 
null for " + this.coordinate.getId());
    +        }
    --- End diff --
    
    I think in this context this is enough


> 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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