Github user JonZeolla commented on a diff in the pull request:
https://github.com/apache/metron/pull/865#discussion_r157196243
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+ The ASF licenses this file to You under the Apache License, Version 2.0
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+ the License. You may obtain a copy of the License at
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+ 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.
+-->
+# Apache Metron Bundle Maven Plugin
+
+Apache Metron Bundles Maven Plugin helps to build Bundles Archives to
support the classloader isolation model.
+
+## Table of Contents
+
+- [Requirements](#requirements)
+- [Building](#building)
+- [Getting Stared](#getting_started)
+- [Getting Help](#getting-help)
+- [License](#license)
+
+## Requirements
+* JDK 1.7 or higher
+* Apache Maven 3.1.0 or higher
+
+## Building
+
+Building the bundles-maven-plugin module should be rare since it will be
released infrequently compared to
+the main 'metron' code tree.
+
+- Build with `mvn clean install`
+- Presuming you need to make use of changes to the bundles-maven-plugin
module, you should next
+ go to the [metron](../metron) directory and follow its instructions.
+
+## Getting Started
+
+While it is most likely
+that a maven archetype is being utilized to create bundles, as part of a
toolkit etc, you may want to create on manually, or may need to create a
project for use in an archetype.
+
+The plugin is utilized by setting the packaging of a maven module to
'bundle'.
+
+```xml
+<packaging>bundle</packaging>
+```
+
+This means that when you package this module, any of it's non-provided
dependencies will be packaged into the produced bundle ( and all of their
non-provided dependencies as well).
+Since a library may not always be distributed as part of a bundle with all
it's dependencies, the bundle module
+shall be a separate module from the actual classes and dependencies to be
bundled.
+
+A very simple example layout for a project that utilizes bundles would be:
+
+```bash
+âââ README.md
+âââ pom.xml
+âââ testapp
+â  âââ pom.xml
+â  âââ src
+â  â  âââ main
+â  â  â  âââ java
+â  â  â  âââ org
+â  â  â  âââ apache
+â  â  â  âââ test
+â  â  â  âââ App.java
+â  â  âââ test
+â  â  âââ java
+â  â  âââ org
+â  â  âââ apache
+â  â  âââ test
+â  â  âââ AppTest.java
+âââ testappbundle
+ âââ pom.xml
+```
+Where testappbundle is the bundle module that creates a bundle of testapp,
and contains the following pom.xml:
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0";
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
+ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd";>
+ <parent>
+ <artifactId>test.bundles.plugin</artifactId>
+ <groupId>org.apache.test</groupId>
+ <version>1.0-SNAPSHOT</version>
+ </parent>
+ <modelVersion>4.0.0</modelVersion>
+
+ <artifactId>test.app.bundle</artifactId>
+
+ <!-- Packaging is bundle -->
+ <packaging>bundle</packaging>
+
+ <!-- All dependencies of this module, and all the dependencies of THAT
dependency will
+ be included in the produced bundle -->
+ <dependencies>
+ <dependency>
+ <groupId>org.apache.test</groupId>
+ <artifactId>test.app</artifactId>
+ <version>1.0-SNAPSHOT</version>
+ </dependency>
+ </dependencies>
+
+ <build>
+ <!-- OUR PLUGIN REFERENCES -->
+ <pluginManagement>
+ <plugins>
+ <plugin>
+ <groupId>org.apache.metron</groupId>
+ <artifactId>bundles-maven-plugin</artifactId>
+ <version>0.4.2</version>
+ <extensions>true</extensions>
+ <configuration>
+ </configuration>
+ </plugin>
+ </plugins>
+ </pluginManagement>
+ <plugins>
+ <plugin>
+ <groupId>org.apache.metron</groupId>
+ <artifactId>bundles-maven-plugin</artifactId>
+ <version>0.4.2</version>
+ <extensions>true</extensions>
+ </plugin>
+ </plugins>
+ </build>
+</project>
+```
+When the module is packaged, it packages all of it's non-provided
dependencies into the bundles /bundled-dependencies directory.
+Thus, to create a bundle of a module's jar and that jar's non-provided
dependencies, you add that module to your
+bundle modules dependencies. You can unzip and examine the bundle in the
target directory, and verify
+it's contents, which should be similar to :
+
+```bash
+-> % tree .
+.
+âââ META-INF
+ âââ MANIFEST.MF
+ âââ bundled-dependencies
+ â  âââ log4j-1.2.17.jar
+ â  âââ metron-common-0.4.1.jar
+ â  âââ slf4j-api-1.7.7.jar
+ â  âââ slf4j-log4j12-1.7.7.jar
+ â  âââ test.app-1.0-SNAPSHOT.jar
+ âââ maven
+ âââ org.apache.test
+ âââ test.app.bundle
+ âââ pom.properties
+ âââ pom.xml
+```
+
+This reflects the testapp project, which has these dependencies :
+
+```xml
+<dependencies>
+ <dependency>
+ <groupId>org.apache.metron</groupId>
+ <artifactId>metron-common</artifactId>
+ <version>0.4.1</version>
+ </dependency>
+ <dependency>
+ <groupId>junit</groupId>
+ <artifactId>junit</artifactId>
+ <version>3.8.1</version>
+ <scope>test</scope>
+ </dependency>
+ </dependencies>
+```
+metron-common itself is a shaded jar, but it depends on log4j and slf4j,
so those libraries are pulled in..
+
+## Quickstart
+
+* Create a new multi module maven project (if you do not have one already)
+* Add a new module for your bundle, it needs only to have a pom.xml
+* Create the pom.xml as above, with the correct plugin and packaging
entries, and add dependencies
+for the module you want to bundle.
+* `mvn package`
+
+## Settings and configuration
+
+There are several properties that can be set to change the behavior of
this plugin.
+Two of special interest are:
+
+#### packageType
+packageType defines the type of archive to be produced and evaluated for
special dependencies. The default packageType is bundle. This property should
be changed if you have need to
+customize the file extension of archives produced by this plugin. This
plugin will build archives with .bundle extentions, and look for othe .bundle
dependencies by definition.
+Changing this value, for example to 'foo', will have the effect of having
the plugin produce archives with .foo as the extension, and look for .foo files
+as bundle dependencies.
+
+#### packageIDPrefix
+The archives produced by this plugin have the following entries added to
the manifest ( where packageIDPrefix defaults to 'Bundle'):
+
+- {packageIDPrefix}-Id
+- {packageIDPrefix}-Group
+- {packageIDPrefix}-Version
+- {packageIDPrefix}-Dependency-Group
+- {packageIDPrefix}-Dependency-Id
+- {packageIDPrefix}-Dependency-Version
+
+This property can be used to change the name of these manifest entries.
One convention being to continue as the original by capitalizing the
+type, such as:
+Bundle to bundle
+
+
+
+## Getting Help
+If you have questions, you can reach out to our mailing list:
dev@metron.apache.org
+We're also often available in IRC: #apache-metron on
+[irc.freenode.net](http://webchat.freenode.net/?channels=#apache-metron).
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