drb-driver-java 1.4.0

DRB Java Driver

JavaNode driver

The drb-driver-java python module aims to wrap Java version of DRB model. It is able to navigates among java nodes content.

See documentation for details.

Library usage

Java (JDK) must be present in the system and the JAVA_HOME environment variable must be set.

Installation

Installing this library with execute the following in a terminal

pip install drb-driver-java

Configuration

Automatic

The classpath is initialized retrieving Java libraries using a specific entry point drb.driver.java where:

• name: represent the Java library package extension (e.g. jar)
• value: represent the package where Java libraries are stocked

The following example will retrieve all jar files resources from the Python package my.package.classpath:

from setuptools import setup

setup(
    entry_points={
        'drb.driver.java': 'jar = my.package.classpath'
    },
    # Other setuptools.setup parameters
)

Manual

To add custom Java libraries to the JVM classpath, please configure CLASSPATH_ADDON environment variable. It contains absolute path of additional Java libraries

export CLASSPATH_ADDON=$CLASSPATH_ADDON:/path/to/my/custom/java/lib

Java Factory and Java Node

The module implements the basic factory model defined in DRB in its node resolver. Based on the python entry point mechanism, this module can be dynamically imported into applications.

The entry point group reference is drb.driver.
The driver name is java.
The factory class DrbJavaFactory is encoded into drb.drivers.factory

The java factory creates a JavaNode from an existing java content. It uses a base node to access the content data using a streamed implementation from the base node.

The base node can be a DrbFileNode, DrbHttpNode, DrbTarNode or any other nodes able to provide streamed (BufferedIOBase, RawIOBase, IO) java content.

limitations

The current version does not manage child modification and insertion. JavaNode is currently read only.

Using this module

To include this module into your project, the drb-driver-java module shall be referenced into requirements.txt file, or the following pip line can be run:

pip install drb-driver-java

Set eventually environment variable CLASSPATH_ADDON and JAVA_HOME