APACHE OODT

Apache OODT Development with IntelliJ IDEA

Image created by the author

Apache OODT is a configurable middleware that allows data managing, processing, and archiving for any subject domain. It was introduced by the Jet Propulsion Laboratory, NASA in 1998 to conveniently manage the planetary data across a number of universities and data collection points. In the present, it is being developed as a top-level project of Apache Software Foundation.

This post will guide you through setting up the local development environment for Apache OODT with IntelliJ IDEA IDE.

0. Install and configure IntelliJ IDEA and Apache Tomcat

First of all, we should have IntelliJ IDEA and Apache Tomcat installed and configured on our computers. To download the IntelliJ IDEA, head over to the Jetbrains website. , download and run the suitable installer for your operating system. After it’s installed, open the project in the IntelliJ IDEA.

To download Apache Tomcat, go to the Tomcat downloads page and download one of the suitable files under the binary distributions section. Once the zip file is downloaded, extract it into a suitable location.

To test the Tomcat installation, change the directory to /bin in a terminal and run catalina.bat start (Windows) or catalina.sh start (*NIX). Go to https://localhost:8080 and see whether it shows the following page. If yes, your Tomcat installation is complete.

Tomcat installation welcome page — Screenshot by author

1. Build and run the file manager component

File manager is one of the main components in Apache OODT. To run it, locate oodt/filemgr/src/main/java/org/apache/oodt/cas/filemgr/system/FileManagerServerMain.java in the IDE. Then click on the green arrow that is left to the main method of the Java class, to run the file manager server.

Run the file manager class from within the IntelliJ IDEA

Well, you will be greeted with an error and that’s reasonable because we haven’t specified a port for the file manager to run. The file manager server expects the port to be passed as a program argument.

To supply program arguments, click the same green arrow again and select modify run configuration, the bottom option from the appearing menu.

Fill the program arguments field in the opening window with the value --portNum 9000 . The default port is 9000 but you are free to supply any available port number.

Also, add the following in the VM options field. If the VM options field is not visible, click the modify options dropdown and check Add VM options to enable it.

-D org.apache.oodt.cas.filemgr.properties=F:\oodt\filemgr\src\main\resources\filemgr.properties

After entering the above configurations, the modified run configuration window for the file manager component should look as follows. Click Apply and OK to confirm it, and then run the file manager server again. The file manager component will spin up successfully.

Modified run configuration for file manager component in IntelliJ IDEA

2. Build and run the workflow manager component

The workflow manager is another main component of Apache OODT. It helps non-programming people to provision workflows to process files. To run it, first, locate the file oodt/workflow/src/main/java/org/apache/oodt/cas/workflow/system/WorkflowManagerStarter.java from within the IDE.

Before starting the workflow manager, make sure to modify its run configuration in the same way we did for the file manager, but with different values.

Add the following to the VM Options field.

-Dorg.apache.oodt.cas.workflow.properties=<your_project_location>\workflow\src\main\resources\workflow.properties

also, add --portNum 9001 to the program arguments field. Then click Apply, OK, and run WorkflowManagerStarter.java.

3. Build and run the resource manager component

The resource manager is the OODT component that is responsible for the execution, monitoring, and tracking of jobs, storage, and networking resources for an underlying set of hardware resources. To run it, first, locate the file oodt/workflow/src/main/java/org/apache/oodt/cas/resource/system/ResourceManagerMain.java from within the IDE.

Before starting the resource manager, make sure to modify its run configuration in the same way we did for the file manager, but with different values.

Add the following to the VM Options field.

-Dorg.apache.oodt.cas.resource.properties=<your_project_location>\resource\src\main\resources\resource.properties

also, add --portNum 9002 to the program arguments field. Then click Apply, OK, and run .ResourceManagerMain.java.

4. Build and run the REST APIs

The webapp directory consists of the REST APIs for the main OODT components. The existing OPSUI and the new React. js-based OPSUI consumes these APIs to display information and execute tasks such as fetching ingested products, executing workflows, etc.

Currently, OODT has the following REST APIs.

  • fmprod - REST API for the file manager OODT component
  • wmservices - REST API for the workflow manager OODT component

To run each API from within the IntelliJ IDEA, change directory to the corresponding folders and run mvn clean install to build the projects. For example, If the fmprod app is successfully built, you will see the following message on the terminal.

FMprod build success message — screenshot by the author

Then go to run -> edit configurations and press the + icon at the top left corner. In the appearing menu, select tomcat local.

In the appearing window, fill in the server tab as shown in the below screenshot.

Then switch to the deployment tab and select artifacts to deploy. Finally, click apply and then OK.

Now select the tomcat configuration from the Select run/debug configuration and run. The REST APIs will now be deployed.

Wrapping up

In this post, we discussed in detail, how to set up the development environment for Apache OODT with Tomcat and IntelliJ IDEA. Special thanks to Imesha Sudasingha and Nadeeshan Gimhana for their guidance. I hope this post was useful to you. If you encounter any problems while following this guide, please inform me in the responses.

Thanks for reading ❤️

References:
[1] https://oodt.apache.org/
[2]https://www.jetbrains.com/help/idea/run-debug-configuration-tomcat-server.html
[3]https://cwiki.apache.org/confluence/display/OODT/CAS+Product+Server+Web+Application+-+Installation+Guide

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Pavindu Lakshan

Pavindu Lakshan

Software Engineer at WSO2 | Tech Blogger | Open-source Enthusiast - Views and opinions are strictly my own