fluxdi 1.2.0

FluxDI - Semi-Automatic Dependency Injector
Documentation 
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use super::*;

impl Application {
    /// Recursively loads a module and its imports into the injector hierarchy.
    ///
    /// Creates a child injector for the module, loads all imported modules first,
    /// then registers the module's own providers. This ensures proper dependency
    /// resolution order.
    ///
    /// # Parameters
    ///
    /// - `parent`: The parent injector to create a child from
    /// - `module`: The module to load
    pub(super) fn load_module(parent: Shared<Injector>, module: ModuleObject) -> Result<(), Error> {
        #[cfg(feature = "tracing")]
        debug!("Loading module into injector hierarchy");

        let module_injector = Shared::new(Injector::child(parent.clone()));

        #[cfg(feature = "tracing")]
        debug!("Created child injector for module");

        let imports = module.imports();
        #[cfg(feature = "tracing")]
        if !imports.is_empty() {
            debug!("Module has {} imports, loading them first", imports.len());
        }

        #[allow(unused_variables)]
        for (index, import) in imports.into_iter().enumerate() {
            #[cfg(feature = "tracing")]
            debug!("Loading import {}", index + 1);

            Self::load_module(module_injector.clone(), import)?;
        }

        #[cfg(feature = "tracing")]
        debug!("Registering module providers");

        let module_name = std::any::type_name_of_val(&*module);
        module.configure(&module_injector).map_err(|err| {
            Error::module_lifecycle_failed(module_name, "configure", &err.to_string())
        })?;

        #[cfg(feature = "tracing")]
        debug!("Module loaded successfully");
        Ok(())
    }

    pub(super) async fn load_module_async(
        parent: Shared<Injector>,
        module: ModuleObject,
    ) -> Result<Vec<LoadedModule>, Error> {
        enum Frame {
            Enter {
                parent: Shared<Injector>,
                module: ModuleObject,
            },
            Exit {
                module_injector: Shared<Injector>,
                module: ModuleObject,
            },
        }

        let mut stack = vec![Frame::Enter { parent, module }];
        let mut loaded = Vec::new();

        while let Some(frame) = stack.pop() {
            match frame {
                Frame::Enter { parent, module } => {
                    let module_injector = Shared::new(Injector::child(parent));
                    let imports = module.imports();

                    stack.push(Frame::Exit {
                        module_injector: module_injector.clone(),
                        module,
                    });

                    for import in imports.into_iter().rev() {
                        stack.push(Frame::Enter {
                            parent: module_injector.clone(),
                            module: import,
                        });
                    }
                }
                Frame::Exit {
                    module_injector,
                    module,
                } => {
                    let module_name = std::any::type_name_of_val(&*module);
                    module.configure(&module_injector).map_err(|err| {
                        Error::module_lifecycle_failed(module_name, "configure", &err.to_string())
                    })?;

                    module
                        .on_start(module_injector.clone())
                        .await
                        .map_err(|err| {
                            Error::module_lifecycle_failed(
                                module_name,
                                "on_start",
                                &err.to_string(),
                            )
                        })?;

                    loaded.push(LoadedModule {
                        module,
                        injector: module_injector,
                    });
                }
            }
        }

        Ok(loaded)
    }
}