Package ru.vyarus.dropwizard.guice.module.installer.feature.eager

Class EagerSingletonInstaller

  • All Implemented Interfaces:
    FeatureInstaller, BindingInstaller
    public class EagerSingletonInstaller
extends java.lang.Object
implements FeatureInstaller, BindingInstaller
    Search for classes with @EagerSingleton annotation and register them in guice context. This may be useful for outstanding classes (not injected by other beans and so not registered with guice. Normally such classes must be manually registered, but using @EagerSingleton annotation allows to register them automatically. Moreover, even in DEVELOPMENT stage instance will be requested, which makes class suitable for initialization logic.
    Since:
    01.09.2014

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void bind​(com.google.inject.Binder binder, java.lang.Class<?> type, boolean lazy)
      Called to apply custom binding for installed feature.
      void extensionBound​(com.google.inject.Stage stage, java.lang.Class<?> type)
      Called after execution of one of above methods.
      java.util.List<java.lang.String> getRecognizableSigns()
      Method used by extensions help report (GuiceBundle.Builder.printExtensionsHelp()) to show what signs this exact installer recognize so user could better understand extensions support specifics.
      <T> void manualBinding​(com.google.inject.Binder binder, java.lang.Class<T> type, com.google.inject.Binding<T> binding)
      Called for extensions, resolved from guice bindings (in user modules).
      boolean matches​(java.lang.Class<?> type)
      NOTE: consider using ru.vyarus.dropwizard.guice.module.installer.util.FeatureUtils to simplify checks (for example, types most likely must be checks to be not abstract).
      void report()
      Called to log registered endpoints in dropwizard log fashion.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • EagerSingletonInstaller

        public EagerSingletonInstaller()

    • Method Detail

      • matches

        public boolean matches​(java.lang.Class<?> type)
        Description copied from interface: FeatureInstaller
        NOTE: consider using ru.vyarus.dropwizard.guice.module.installer.util.FeatureUtils to simplify checks (for example, types most likely must be checks to be not abstract).

        When type accepted by any extension it's registered in guice module.

        Specified by:
        matches in interface FeatureInstaller
        Parameters:
        type - type to check
        Returns:
        true if extension recognized, false otherwise

      • bind

        public void bind​(com.google.inject.Binder binder,
                 java.lang.Class<?> type,
                 boolean lazy)
        Description copied from interface: BindingInstaller
        Called to apply custom binding for installed feature. By default, all found extensions are installed as binder.bind(type). This method will be called instead of default registration.

        Called only for non binding extensions (extensions that are not already bound in guice module.

        WARNING: may be called multiple times due to enabled bindings reporting! Be sure to produce correct logs.

        Specified by:
        bind in interface BindingInstaller
        Parameters:
        binder - guice binder
        type - extension class
        lazy - true if extension is annotated with LazyBinding

      • manualBinding

        public <T> void manualBinding​(com.google.inject.Binder binder,
                              java.lang.Class<T> type,
                              com.google.inject.Binding<T> binding)
        Description copied from interface: BindingInstaller
        Called for extensions, resolved from guice bindings (in user modules). May be used to validate binding or do some additional bindings with existing binding. Binding is detected primarily by main key Binding.getKey(), but linked bindings (LinkedKeyBinding) are also checked for target key (LinkedKeyBinding.getLinkedKey()).

        LazyBinding flag is not used here because guicey will automatically throw an error if existing binding is annotated as lazy binding (which don't makes any sense).

        WARNING: may be called multiple times due to enabled bindings reporting! Be sure to produce correct logs.

        Specified by:
        manualBinding in interface BindingInstaller
        Type Parameters:
        T - extension type, used to connect extension class with binding
        Parameters:
        binder - guice binder
        type - extension class
        binding - binding declaration from guice module
        See Also:
        for errors reporting

      • extensionBound

        public void extensionBound​(com.google.inject.Stage stage,
                           java.lang.Class<?> type)
        Description copied from interface: BindingInstaller
        Called after execution of one of above methods. Useful for reporting. Binder is not provided here to avoid confusion with BindingInstaller.bind(Binder, Class, boolean).

        WARNING: may be called multiple times due to enabled bindings reporting! Be sure to produce correct logs.

        Specified by:
        extensionBound in interface BindingInstaller
        Parameters:
        stage - stage (useful for differentiation between normal run (Stage.PRODUCTION) and report rendering (Stage.TOOL)
        type - extension class

      • report

        public void report()
        Description copied from interface: FeatureInstaller
        Called to log registered endpoints in dropwizard log fashion. It's important to naturally show all dynamically resolved classes to easily catch errors. Use Reporter to simplify reporting.

        Method may do nothing if reporting not required

        Specified by:
        report in interface FeatureInstaller