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DEVELOPER_GUIDE.md

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Developer Guide

So you want to contribute code to this project? Excellent! We're glad you're here. Here's what you need to do.

Forking and Cloning

Fork this repository on GitHub, and clone locally with git clone.

Install Prerequisites

JDK 14

OpenSearch components build using Java 14 at a minimum. This means you must have a JDK 14 installed with the environment variable JAVA_HOME referencing the path to Java home for your JDK 14 installation, e.g. JAVA_HOME=/usr/lib/jvm/jdk-14.

Setup

  1. Check out this package from version control.
  2. Launch Intellij IDEA, choose Import Project, and select the settings.gradle file in the root of this package.
  3. To build from the command line, set JAVA_HOME to point to a JDK >= 14 before running ./gradlew.

  • Unix System

    1. export JAVA_HOME=jdk-install-dir: Replace jdk-install-dir with the JAVA_HOME directory of your system.
    2. export PATH=$JAVA_HOME/bin:$PATH

  • Windows System

    1. Find My Computers from file directory, right click and select properties.
    2. Select the Advanced tab, select Environment variables.
    3. Edit JAVA_HOME to path of where JDK software is installed.

Build

The JobScheduler plugin uses the Gradle build system.

  1. Checkout this package from version control.
  2. To build from command line set JAVA_HOME to point to a JDK >=14
  3. Run ./gradlew build

Then you will find the built artifact located at build/distributions directory

Install

Once you have built the plugin from source code, run

opensearch-plugin install file:///path/to/target/releases/opensearch-job-scheduler-<version>.zip

to install the JobScheduler plugin to your OpenSearch.

Develop a plugin that extends JobScheduler

JobScheduler plugin provides a SPI for other plugins to implement. Essentially, you need to

  1. Define your JobParameter type by implementing ScheduledJobParameter interface
  2. Implement your JobParameter parser function that can deserialize your JobParameter from XContent
  3. Create your JobRunner implementation by implementing ScheduledJobRunner interface
  4. Create your own plugin which implements JobSchedulerExtension interface
    • don't forget to create the service provider configuration file in your resources folder and bundle it into your plugin artifact

Please refer to the sample-extension-plugin subproject in this project, which provides a complete example of using JobScheduler to run periodical jobs.

The sample extension plugin takes an index name as input and logs the index shards to opensearch logs according to the specified Schedule. And it also exposes a REST endpoint for end users to create/delete jobs.

Using IntelliJ IDEA

Launch Intellij IDEA, choose Import Project, and select the settings.gradle file in the root of this package.

Submitting Changes

See CONTRIBUTING.