DPML Metro Component Task

Classpath Element

Description

A <classpath> element defines a classloader chain based on the three classloader categories - PUBLIC, PROTECTED and PRIVATE. Typically a classloader chain will be constructed relative to a supplied anchor classloader. The anchor will be used as the parent to a PUBLIC classloader which in-turn is used as the parent for the creatio of a protected (or SPI) classloader. The protected classloader is used as the parent to the PRIVATE implemention classloader.

Nested Elements

`public`	Declaration of the collection of resource uris that collectively define the public classloader. The `<public>` element is optional and may contain 0..n nested `<uri>` elements.
`protected`	Declaration of the collection of resource uris that collectively define the protected classloader which is itself defined using the public classloader as its parent. The `<protected>`element is optional and may contain 0..n nested `<uri>` elements.
`private`	Declaration of the collection of resource uris that collectively define the private implementation classloader which is itself defined using the protected classloader as its parent. The `<private>`element is optional and may contain 0..n nested `<uri>` elements.

Examples

<part xmlns="dpml:part">

  <info title="DPML Depot Toolkit">
    <description>Antlib supporting Depot-based build automation.</description>
  </info>
  
  <component xmlns="dpml:metro" name="builder" class="dpml.tools.impl.StandardBuilder"/>
  
  <classpath>
    <private>
      <uri>artifact:jar:dpml/transit/dpml-transit-main#2.0.0</uri>
      <uri>artifact:jar:dpml/metro/dpml-metro-part#2.0.0</uri>
      <uri>artifact:jar:dpml/depot/dpml-depot-library#2.0.0</uri>
      <uri>artifact:jar:dpml/util/dpml-util-cli#2.0.0</uri>
      <uri>artifact:jar:dpml/depot/dpml-depot-build#2.0.0</uri>
      <uri>artifact:jar:org/apache/ant/ant-launcher#1.7.0</uri>
      <uri>artifact:jar:org/apache/ant/ant#1.7.0</uri>
      <uri>artifact:jar:junit/junit#4.2</uri>
      <uri>artifact:jar:org/apache/ant/ant-junit#1.7.0</uri>
      <uri>artifact:jar:org/apache/ant/ant-trax#1.7.0</uri>
      <uri>artifact:jar:dpml/depot/dpml-depot-builder#2.0.0</uri>
    </private>
  </classpath>
</part>