Bootstrap

In some cases, it is useful to hook into the startup process of a Mangoo I/O application, such as initializing a database connection. For these cases, Mangoo I/O provides the MangooBootstrap interface, which can be implemented in a class within the /conf package of your application.

Implementing the Bootstrap Class

The Bootstrap class allows you to execute code at different stages of the application lifecycle. Below is a basic implementation:

package app;

import io.mangoo.interfaces.MangooBootstrap;

public class Bootstrap implements MangooBootstrap {

    @Override
    public void initializeRoutes() {
        // Executed when routes are initialized
    }

    @Override
    public void applicationInitialized() {
        // Executed after the application has been initialized
    }

    @Override
    public void applicationStarted() {
        // Executed after the application has fully started
    }

    @Override
    public void applicationStopped() {
        // Executed when the application is shutting down
    }
}

The class name does not need to be Bootstrap, but it must implement the MangooBootstrap interface. Additionally, you must bind the implementation using Google Guice in the Module class.

Configuring the Module Class

The Module class is also located in the /conf package and is responsible for defining dependency bindings using Google Guice. You can bind the MangooBootstrap implementation as shown below:

package app;

import com.google.inject.AbstractModule;
import io.mangoo.interfaces.MangooBootstrap;

public class Module extends AbstractModule {
    @Override
    protected void configure() {
        bind(MangooBootstrap.class).to(Bootstrap.class);
    }
}

The Module class can also be used to define additional custom Google Guice bindings as needed.