Context and System.IDisposable

Can be used to deliver context parameters if it is not possible to do it via usual method parameters.
Runnable job, which defines context:
final class VKTest
{
    /// <summary>
    /// Class entry point. The system will call this method when a designated menu 
    /// is selected or when execution starts and this class is set as the startup class.
    /// </summary>
    /// <param name = "_args">The specified arguments.</param>
    public static void main(Args _args)
    {
        info('Start using');
        using(VKTestContext context = new VKTestContext())
        {
            context.boolProperty = true;
            
            VKTestExecutable exec = new VKTestExecutable();
            exec.performAction();
        }

        VKTestExecutable exec = new VKTestExecutable();
        exec.performAction();
        info('End using');

        // try-finally alternative 
        info('Start try');
        VKTestContext context = new VKTestContext();
        try
        {
            context.boolProperty = true;
            exec = new VKTestExecutable();
            exec.performAction();
        }
        finally
        {
            context.dispose();
            context = null;
        }
        exec = new VKTestExecutable();
        exec.performAction();
        info('End try');
    }

}
Execution infolog:
Start using
True
False
End using
Start try
True
False

End try

Context class with required parameters/logic
class VKTestContext implements System.IDisposable
{
    static VKTestContext instance;
    public boolean boolProperty;

    public void new()
    {
        if(instance)
        {
            throw error("Nesting of VKTestContext is not supported");
        }
        instance = this;
    }

    public void dispose()
    {
        instance = null;
    }

    static public VKTestContext current()
    {
        return instance;
    }
}
The class that consumes context:
class VKTestExecutable
{
    void performAction()
    {
        VKTestContext context = VKTestContext::current();
        if (context && context.boolProperty)
        {
            info("True");
        }
        else
        {
            info("False");
        }
    }
}
https://learn.microsoft.com/en-us/dotnet/standard/design-guidelines/dispose-pattern
Alternative: Singleton pattern

 

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