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Creating a plugin for Stress Pilot involves implementing a set of Java interfaces.

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1. Set Up Your Maven Project

Create a new Maven project and add the stresspilot-core dependency (or link it as a module). 
<dependency>
    <groupId>dev.zeann3th</groupId>
    <artifactId>stresspilot-core</artifactId>
    <version>0.0.1-SNAPSHOT</version>
</dependency>

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2. Implement the Endpoint Executor

The EndpointExecutor is responsible for performing the actual test operation. 
public class MyCustomExecutor implements EndpointExecutor {
    @Override
    public ExecutionResult execute(Endpoint endpoint, Environment environment) {
        // Implement your execution logic here
        // e.g., send a custom network message
        return ExecutionResult.builder()
                .status(ExecutionStatus.SUCCESS)
                .responseBody("Execution completed successfully")
                .build();
    }
}

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3. Implement the Endpoint Validator

The EndpointValidator ensures that the endpoint configuration is valid. 
public class MyCustomValidator implements EndpointValidator {
    @Override
    public ValidationResult validate(Endpoint endpoint) {
        if (endpoint.getUrl() == null || endpoint.getUrl().isEmpty()) {
            return ValidationResult.error("URL must not be empty");
        }
        return ValidationResult.success();
    }
}

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4. Register Your Plugin

Currently, plugins are registered via the PluginService. You need to package your plugin as a JAR and upload it to the marketplace or add it to the classpath of the stresspilot core.

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Example: JavaScript Plugin

The JavaScript plugin allows you to execute custom JS code as part of your test. 
public class JsEndpointExecutor implements EndpointExecutor {
    @Override
    public ExecutionResult execute(Endpoint endpoint, Environment environment) {
        String script = endpoint.getConfig().get("script");
        // Use GraalVM or similar to execute the script
        return ExecutionResult.builder()
                .status(ExecutionStatus.SUCCESS)
                .build();
    }
}