The Atsign Platform for Java developers

This repository contains libraries, tools, samples and examples for developers that wish to work with the Atsign Platform from Java code.

Modules

There are 4 modules.

1. at_client is the Java SDK for interacting with the Atsign Platform README.
2. at_shell is a self-contained "fatjar" that provides an interactive command line interface for performing various operations and tests README.
3. at_utils contains useful code which is not part of the SDK README.
4. examples contains sample code which illustrates how to use the SDK README.

Build Process

Prerequisites

• Java (JDK 11 or above)
• Maven (3.6.3 or above)

Check out, build and test with the following commands:

git clone https://github.com/atsign-foundation/at_java.git
mvn install

Note: The integration tests rely on the virtual env. The tests will attempt to start a docker container with this image but that relies on dockerd (or desktop docker). If you want to skip these tests then add -DskipITs. See subsequent section for more information.

Unit Tests

These have no external dependencies and are run as part of the maven test lifecycle. The surefire plugin will pick up classes that end in the following:

**/*Test.java
**/*Tests.java
**/*TestCase.java

Use -DskipTests to avoid running unit tests.

Integration Tests

These depend on running the atsign virtual environment and are run as part of the maven verify lifecycle. The failsafe plugin will pick up classes that end in the following:

**/*IT.java

Use -DskipITs to avoid running integration tests.

The integration tests check to see if a virtual env is running. If not they will attempt to start one. This requires dockerd or desktop docker to be running.

For CI, "standing up" and then "tearing down" the docker container is the intended behavior. However, for a developer this will be slow so it's preferable to "standup" the virtual env independently, like this:

cd at_client/src/test/resources/org/atsign/virtualenv
docker compose -f up

The start-up can take a few minutes and involves running scripts that install the test configuration. The environment is ready to test with when you see the following log output:

...
virtualenv-1  | SHOUT|...| install_PKAM_Keys |cramAndPkamAuth successful for @chris
virtualenv-1  | SHOUT|...| install_PKAM_Keys |cramAndPkamAuth successful for @policy1
virtualenv-1  | SHOUT|...| install_PKAM_Keys |cramAndPkamAuth successful for @emoji

The tests require test keys (CRAM keys and atKeys) which the virtual env was built with. The pom contains a plugin which downloads the at_demo_data package and unpacks it under target. When the tests run this is where they expect to find keys. The release version is specified as property in the POM and needs to be periodically updated to the latest release.

Note: The integration tests are designed to reset the virtual env as best as possible. This relies on teardown steps. If you are debugging tests and terminate the execution then this can leave the virtual env in an unreset state. Running the test again might fail because of this BUT that teardown should successfully reset the env and allow the next run to succeed. In extreme circumstances it may be necessary to reset the docker container, like this:

cd at_client/src/test/resources/org/atsign/virtualenv
docker compose -f down
docker compose -f up

Virtual Environment

This is a docker image that bundles the following:

• redis
• root server
• multiple at_servers in different states of configuration

The docker image is published as part of the at_server repository.

The keys (CRAM secrets, pre-cut AtKeys) are part the at_demos repository.

The pom.xml for modules which run have integration tests include a plugin which downloads the at_demos package to target.

Code Style And Formatting

The maven poms contain the following plugins to enforce a consistent coding style and format.

• checkstyle
• spotless

The rules which configure the respective plugins are here

• checkstyle.xml
• java-format.xml

Run the following maven command run the checks:

mvn validate

Run the following maven command to fix the spotless violations:

mvn spotless:apply

Intellij

To configure Intellij to use the same settings

1. Add the Adaptor for Eclipse Code Formatter plugin and configure in Settings -> Adaptor for Eclipse Code Formatter by setting Eclipse workspace/project folder or config file as config/java-format.xml
2. Add CheckStyle-IDEA plugin and configure in Settings -> Tools -> Checkstyle by adding config/checkstyle.xml

Contributions welcome

All of our software is open with intent. We welcome contributions - we want pull requests, and we want to hear about issues. See also CONTRIBUTING.md