gradle-tooling.java

// Assuming there is a "ConsumerActionExecutor actionExecutor(ActionExecutorContext context)" in ProjectConnection.

final class ActionExecutorContext {
    // Properties, like JavaHome, JvmArguments, Std[Err/Out/In] redirection
    // I recommend this class to be immutable (created by a Builder).
}

interface ConsumerActionExecutor {
    // After this method returns the actionListener will no longer be notified
    // and the action has been executed.
    <T> void execute(CancellationToken cancelToken, ConsumerAction<T> action, ConsumerActionListener<T> actionListener) throws IOException;
}

interface ConsumerActionListener<T> {
    void progressChanged(ProgressEvent event);

    void modelLoaded(T model);
}

interface ConsumerAction<T> {
    void doAction(CancellationToken cancelToken, GradleAccessor accessor, ActionResultProvider<T> resultProvider);
}

interface ActionResultProvider<T> {
    void sendModel(T model);
    void setProgress(ProgressEvent event);
}

interface GradleAccessor {
    // Only for project independent models
    <T> T getModel(Class<T> modelClass);

    // ProjectTree should contain only things available from
    // evaluation of "settings.gradle". As a minimum, the fully qualified
    // project name (i.e., "path") and the project folder.
    ProjectTree getProjectTree();

    // Returns the fully qualified name of the project defined for
    // the associated ProjectConnection.
    String getMainProjectPath();

    // Evaluates a project specified by its fully qualified name
    void evaluateProject(String path);

    // Returns the fully qualified name of the evaluated projects.
    List<EvaluatedProject> getEvaluatedProjects();
}

interface EvaluatedProject {
    // Returns the fully qualified name of this project.
    String getPath();

    File getProjectDir();

    <T> T getModel(Class<T> modelClass);
}