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Java example source code file (ProvisionListener.java)

This example Java source code file (ProvisionListener.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

binding, provisioninvocation, provisionlistener, util

The ProvisionListener.java Java example source code

/*
 * Copyright (C) 2011 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.spi;

import com.google.inject.Binding;
import com.google.inject.Provider;
import com.google.inject.Scope;

import java.util.List;

/**
 * Listens for provisioning of objects. Useful for gathering timing information
 * about provisioning, post-provision initialization, and more.
 * 
 * @author sameb@google.com (Sam Berlin)
 * @since 4.0
 */
public interface ProvisionListener {

  /**
   * Invoked by Guice when an object requires provisioning. Provisioning occurs
   * when Guice locates and injects the dependencies for a binding. For types
   * bound to a Provider, provisioning encapsulates the {@link Provider#get}
   * method. For toInstance or constant bindings, provisioning encapsulates
   * the injecting of {@literal @}{@code Inject}ed fields or methods.
   * For other types, provisioning encapsulates the construction of the
   * object. If a type is bound within a {@link Scope}, provisioning depends on
   * the scope. Types bound in Singleton scope will only be provisioned once.
   * Types bound in no scope will be provisioned every time they are injected.
   * Other scopes define their own behavior for provisioning.
   * <p>
   * To perform the provision, call {@link ProvisionInvocation#provision()}.
   * If you do not explicitly call provision, it will be automatically done after
   * this method returns.  It is an error to call provision more than once.
   */
  <T> void onProvision(ProvisionInvocation provision);

  /**
   * Encapsulates a single act of provisioning.
   *
   * @since 4.0
   */ 
  public abstract static class ProvisionInvocation<T> {

    /**
     * Returns the Binding this is provisioning.
     * <p>
     * You must not call {@link Provider#get()} on the provider returned by
     * {@link Binding#getProvider}, otherwise you will get confusing error messages.
     */
    public abstract Binding<T> getBinding();

    /** Performs the provision, returning the object provisioned. */
    public abstract T provision();
    
    /** Returns the dependency chain that led to this object being provisioned. */
    public abstract List<DependencyAndSource> getDependencyChain();
    
  }
}

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