Examples of com.google.inject.Module

com.google.inject.Module
A module contributes configuration information, typically interface bindings, which will be used to create an {@link Injector}. A guice-based application is ultimately composed of little more than a set of {@code Module}s and some bootstrapping code.
Your Module classes can use a more streamlined syntax by extending {@link AbstractModule} rather than implementing this interface directly.

  
  /**
   * With overrides, we should get the union of all map bindings.
   */
  public void testModuleOverrideAndMapBindings() {
    Module ab = new AbstractModule() {
      @Override protected void configure() {
        MapBinder<String, String> multibinder = MapBinder.newMapBinder(binder(), String.class, String.class);
        multibinder.addBinding("a").toInstance("A");
        multibinder.addBinding("b").toInstance("B");
      }
    };
    Module cd = new AbstractModule() {
      @Override protected void configure() {
        MapBinder<String, String> multibinder = MapBinder.newMapBinder(binder(), String.class, String.class);
        multibinder.addBinding("c").toInstance("C");
        multibinder.addBinding("d").toInstance("D");
      }
    };
    Module ef = new AbstractModule() {
      @Override protected void configure() {
        MapBinder<String, String> multibinder = MapBinder.newMapBinder(binder(), String.class, String.class);
        multibinder.addBinding("e").toInstance("E");
        multibinder.addBinding("f").toInstance("F");
      }
    };


    Module abcd = Modules.override(ab).with(cd);
    Injector injector = Guice.createInjector(abcd, ef);
    assertEquals(mapOf("a", "A", "b", "B", "c", "C", "d", "D", "e", "E", "f", "F"),
        injector.getInstance(Key.get(mapOfString)));
    assertMapVisitor(Key.get(mapOfString), stringType, stringType, setOf(abcd, ef), BOTH, false, 0,
        instance("a", "A"), instance("b", "B"), instance("c", "C"), instance("d", "D"), instance(

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        instance("a", "A"), instance("b", "B"), instance("c", "C"), instance("d", "D"), instance(
            "e", "E"), instance("f", "F"));
  }
  
  public void testDeduplicateMapBindings() {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        MapBinder<String, String> mapbinder =
            MapBinder.newMapBinder(binder(), String.class, String.class);
        mapbinder.addBinding("a").toInstance("A");
        mapbinder.addBinding("a").toInstance("A");

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  /**
   * With overrides, we should get the union of all map bindings.
   */
  public void testModuleOverrideAndMapBindingsWithPermitDuplicates() {
    Module abc = new AbstractModule() {
      @Override protected void configure() {
        MapBinder<String, String> multibinder = MapBinder.newMapBinder(binder(), String.class, String.class);
        multibinder.addBinding("a").toInstance("A");
        multibinder.addBinding("b").toInstance("B");
        multibinder.addBinding("c").toInstance("C");
        multibinder.permitDuplicates();
      }
    };
    Module cd = new AbstractModule() {
      @Override protected void configure() {
        MapBinder<String, String> multibinder = MapBinder.newMapBinder(binder(), String.class, String.class);
        multibinder.addBinding("c").toInstance("C");
        multibinder.addBinding("d").toInstance("D");
        multibinder.permitDuplicates();
      }
    };
    Module ef = new AbstractModule() {
      @Override protected void configure() {
        MapBinder<String, String> multibinder = MapBinder.newMapBinder(binder(), String.class, String.class);
        multibinder.addBinding("e").toInstance("E");
        multibinder.addBinding("f").toInstance("F");
        multibinder.permitDuplicates();
      }
    };


    Module abcd = Modules.override(abc).with(cd);
    Injector injector = Guice.createInjector(abcd, ef);
    assertEquals(mapOf("a", "A", "b", "B", "c", "C", "d", "D", "e", "E", "f", "F"),
        injector.getInstance(Key.get(mapOfString)));
    assertMapVisitor(Key.get(mapOfString), stringType, stringType, setOf(abcd, ef), BOTH, true, 0,
        instance("a", "A"), instance("b", "B"), instance("c", "C"), instance(

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    final Object anObject = new Object() {
      @Inject void initialize(Map<String, String> map) {
        injectedMap.set(map);
      }
    };
    Module abc = new AbstractModule() {
      @Override protected void configure() {
        requestInjection(anObject);
        MapBinder<String, String> multibinder =
            MapBinder.newMapBinder(binder(), String.class, String.class);
        multibinder.addBinding("a").toInstance("A");

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    final Object anObject = new Object() {
      @Inject void initialize(Map<String, Set<Provider<String>>> multimap) {
        injectedMultimap.set(multimap);
      }
    };
    Module abc = new AbstractModule() {
      @Override protected void configure() {
        requestInjection(anObject);
        MapBinder<String, String> multibinder =
            MapBinder.newMapBinder(binder(), String.class, String.class);
        multibinder.permitDuplicates();

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      OptionalBinder.javaOptionalOfJavaxProvider(intKey.getTypeLiteral()) : null;


  final TypeLiteral<List<String>> listOfStrings = new TypeLiteral<List<String>>() {};


  public void testTypeNotBoundByDefault() {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class);
        requireBinding(new Key<Optional<String>>() {}); // the above specifies this.
        requireBinding(String.class); // but it doesn't specify this.
        binder().requireExplicitBindings(); // need to do this, otherwise String will JIT

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      assertEquals(1, ce.getErrorMessages().size());
    }
  } 
  
  public void testOptionalIsAbsentByDefault() throws Exception {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class);
      }
    };

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      assertFalse(optionalJxP.isPresent());
    }
  }
  
  public void testUsesUserBoundValue() throws Exception {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class);
      }
      @Provides String provideString() { return "foo"; }
    };

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      assertEquals("foo", optionalJxP.get().get());
    }
  }
  
  public void testSetDefault() throws Exception {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class).setDefault().toInstance("a");
      }
    };
    Injector injector = Guice.createInjector(module);

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      assertEquals("a", optionalJxP.get().get());
    }
  }
  
  public void testSetBinding() throws Exception {
    Module module = new AbstractModule() {
      @Override protected void configure() {
        OptionalBinder.newOptionalBinder(binder(), String.class).setBinding().toInstance("a");
      }
    };
    Injector injector = Guice.createInjector(module);

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