home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (PrivateModule.java)

This example Java source code file (PrivateModule.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

annotatedbindingbuilder, annotatedelementbuilder, annotation, linkedbindingbuilder, membersinjector, method, privatebinder, provider, provisionlistener, re-entry, reflection, scope, the, typeconverter, typeliteral

The PrivateModule.java Java example source code

/**
 * Copyright (C) 2008 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.inject;

import static com.google.common.base.Preconditions.checkState;

import com.google.inject.binder.AnnotatedBindingBuilder;
import com.google.inject.binder.AnnotatedConstantBindingBuilder;
import com.google.inject.binder.AnnotatedElementBuilder;
import com.google.inject.binder.LinkedBindingBuilder;
import com.google.inject.matcher.Matcher;
import com.google.inject.spi.Message;
import com.google.inject.spi.ProvisionListener;
import com.google.inject.spi.TypeConverter;
import com.google.inject.spi.TypeListener;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;

/**
 * A module whose configuration information is hidden from its environment by default. Only bindings
 * that are explicitly exposed will be available to other modules and to the users of the injector.
 * This module may expose the bindings it creates and the bindings of the modules it installs.
 *
 * <p>A private module can be nested within a regular module or within another private module using
 * {@link Binder#install install()}.  Its bindings live in a new environment that inherits bindings,
 * type converters, scopes, and interceptors from the surrounding ("parent") environment.  When you
 * nest multiple private modules, the result is a tree of environments where the injector's
 * environment is the root.
 *
 * <p>Guice EDSL bindings can be exposed with {@link #expose(Class) expose()}. {@literal @}{@link
 * com.google.inject.Provides Provides} bindings can be exposed with the {@literal @}{@link
 * Exposed} annotation:
 *
 * <pre>
 * public class FooBarBazModule extends PrivateModule {
 *   protected void configure() {
 *     bind(Foo.class).to(RealFoo.class);
 *     expose(Foo.class);
 *
 *     install(new TransactionalBarModule());
 *     expose(Bar.class).annotatedWith(Transactional.class);
 *
 *     bind(SomeImplementationDetail.class);
 *     install(new MoreImplementationDetailsModule());
 *   }
 *
 *   {@literal @}Provides {@literal @}Exposed
 *   public Baz provideBaz() {
 *     return new SuperBaz();
 *   }
 * }
 * </pre>
 *
 * <p>Private modules are implemented using {@link Injector#createChildInjector(Module[]) parent
 * injectors}. When it can satisfy their dependencies, just-in-time bindings will be created in the
 * root environment. Such bindings are shared among all environments in the tree.
 * 
 * <p>The scope of a binding is constrained to its environment. A singleton bound in a private
 * module will be unique to its environment. But a binding for the same type in a different private
 * module will yield a different instance.
 *
 * <p>A shared binding that injects the {@code Injector} gets the root injector, which only has
 * access to bindings in the root environment. An explicit binding that injects the {@code Injector}
 * gets access to all bindings in the child environment.
 *
 * <p>To promote a just-in-time binding to an explicit binding, bind it:
 * <pre>
 *   bind(FooImpl.class);
 * </pre>
 *
 * @author jessewilson@google.com (Jesse Wilson)
 * @since 2.0
 */
public abstract class PrivateModule implements Module {

  /** Like abstract module, the binder of the current private module */
  private PrivateBinder binder;

  public final synchronized void configure(Binder binder) {
    checkState(this.binder == null, "Re-entry is not allowed.");

    // Guice treats PrivateModules specially and passes in a PrivateBinder automatically.
    this.binder = (PrivateBinder) binder.skipSources(PrivateModule.class);
    try {
      configure();
    } finally {
      this.binder = null;
    }
  }

  /**
   * Creates bindings and other configurations private to this module. Use {@link #expose(Class)
   * expose()} to make the bindings in this module available externally.
   */
  protected abstract void configure();

  /** Makes the binding for {@code key} available to other modules and the injector. */
  protected final <T> void expose(Key key) {
    binder().expose(key);
  }

  /**
   * Makes a binding for {@code type} available to other modules and the injector. Use {@link
   * AnnotatedElementBuilder#annotatedWith(Class) annotatedWith()} to expose {@code type} with a
   * binding annotation.
   */
  protected final AnnotatedElementBuilder expose(Class<?> type) {
    return binder().expose(type);
  }

  /**
   * Makes a binding for {@code type} available to other modules and the injector. Use {@link
   * AnnotatedElementBuilder#annotatedWith(Class) annotatedWith()} to expose {@code type} with a
   * binding annotation.
   */
  protected final AnnotatedElementBuilder expose(TypeLiteral<?> type) {
    return binder().expose(type);
  }

  // everything below is copied from AbstractModule

  /**
   * Returns the current binder.
   */
  protected final PrivateBinder binder() {
    checkState(binder != null, "The binder can only be used inside configure()");
    return binder;
  }

  /**
   * @see Binder#bindScope(Class, Scope)
   */
  protected final void bindScope(Class<? extends Annotation> scopeAnnotation, Scope scope) {
    binder().bindScope(scopeAnnotation, scope);
  }

  /**
   * @see Binder#bind(Key)
   */
  protected final <T> LinkedBindingBuilder bind(Key key) {
    return binder().bind(key);
  }

  /**
   * @see Binder#bind(TypeLiteral)
   */
  protected final <T> AnnotatedBindingBuilder bind(TypeLiteral typeLiteral) {
    return binder().bind(typeLiteral);
  }

  /**
   * @see Binder#bind(Class)  
   */
  protected final <T> AnnotatedBindingBuilder bind(Class clazz) {
    return binder().bind(clazz);
  }

  /**
   * @see Binder#bindConstant()
   */
  protected final AnnotatedConstantBindingBuilder bindConstant() {
    return binder().bindConstant();
  }

  /**
   * @see Binder#install(Module)
   */
  protected final void install(Module module) {
    binder().install(module);
  }

  /**
   * @see Binder#addError(String, Object[])
   */
  protected final void addError(String message, Object... arguments) {
    binder().addError(message, arguments);
  }

  /**
   * @see Binder#addError(Throwable)
   */
  protected final void addError(Throwable t) {
    binder().addError(t);
  }

  /**
   * @see Binder#addError(Message)
   */
  protected final void addError(Message message) {
    binder().addError(message);
  }

  /**
   * @see Binder#requestInjection(Object)
   */
  protected final void requestInjection(Object instance) {
    binder().requestInjection(instance);
  }

  /**
   * @see Binder#requestStaticInjection(Class[])
   */
  protected final void requestStaticInjection(Class<?>... types) {
    binder().requestStaticInjection(types);
  }

  /*if[AOP]*/
  /**
   * @see Binder#bindInterceptor(com.google.inject.matcher.Matcher, com.google.inject.matcher.Matcher, org.aopalliance.intercept.MethodInterceptor[])
   */
  protected final void bindInterceptor(Matcher<? super Class classMatcher,
      Matcher<? super Method> methodMatcher,
      org.aopalliance.intercept.MethodInterceptor... interceptors) {
    binder().bindInterceptor(classMatcher, methodMatcher, interceptors);
  }
  /*end[AOP]*/

  /**
   * Instructs Guice to require a binding to the given key.
   */
  protected final void requireBinding(Key<?> key) {
    binder().getProvider(key);
  }

  /**
   * Instructs Guice to require a binding to the given type.
   */
  protected final void requireBinding(Class<?> type) {
    binder().getProvider(type);
  }

  /**
   * @see Binder#getProvider(Key)
   */
  protected final <T> Provider getProvider(Key key) {
    return binder().getProvider(key);
  }
  
  /**
   * @see Binder#getProvider(Class)
   */
  protected final <T> Provider getProvider(Class type) {
    return binder().getProvider(type);
  }

  /**
   * @see Binder#convertToTypes(com.google.inject.matcher.Matcher, com.google.inject.spi.TypeConverter)
   */
  protected final void convertToTypes(Matcher<? super TypeLiteral typeMatcher,
      TypeConverter converter) {
    binder().convertToTypes(typeMatcher, converter);
  }

  /**
   * @see Binder#currentStage()
   */
  protected final Stage currentStage() {
    return binder().currentStage();
  }

  /**
   * @see Binder#getMembersInjector(Class)
   */
  protected <T> MembersInjector getMembersInjector(Class type) {
    return binder().getMembersInjector(type);
  }

  /**
   * @see Binder#getMembersInjector(TypeLiteral)
   */
  protected <T> MembersInjector getMembersInjector(TypeLiteral type) {
    return binder().getMembersInjector(type);
  }

  /**
   * @see Binder#bindListener(com.google.inject.matcher.Matcher, com.google.inject.spi.TypeListener)
   */
  protected void bindListener(Matcher<? super TypeLiteral typeMatcher,
      TypeListener listener) {
    binder().bindListener(typeMatcher, listener);
  }
  
  /**
   * @see Binder#bindListener(Matcher, ProvisionListener...)
   * @since 4.0
   */
  protected void bindListener(Matcher<? super Binding bindingMatcher,
      ProvisionListener... listeners) {
    binder().bindListener(bindingMatcher, listeners);
  }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java PrivateModule.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.