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Java example source code file (Scope.java)

This example Java source code file (Scope.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

provider, scope, string

The Scope.java Java example source code

/**
 * Copyright (C) 2006 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;

/**
 * A scope is a level of visibility that instances provided by Guice may have.
 * By default, an instance created by the {@link Injector} has <i>no scope,
 * meaning it has no state from the framework's perspective -- the
 * {@code Injector} creates it, injects it once into the class that required it,
 * and then immediately forgets it. Associating a scope with a particular
 * binding allows the created instance to be "remembered" and possibly used
 * again for other injections.
 *
 * <p>An example of a scope is {@link Scopes#SINGLETON}.
 *
 * @author crazybob@google.com (Bob Lee)
 */
public interface Scope {

  /**
   * Scopes a provider. The returned provider returns objects from this scope.
   * If an object does not exist in this scope, the provider can use the given
   * unscoped provider to retrieve one.
   *
   * <p>Scope implementations are strongly encouraged to override
   * {@link Object#toString} in the returned provider and include the backing
   * provider's {@code toString()} output.
   *
   * @param key binding key
   * @param unscoped locates an instance when one doesn't already exist in this
   *  scope.
   * @return a new provider which only delegates to the given unscoped provider
   *  when an instance of the requested object doesn't already exist in this
   *  scope
   */
  public <T> Provider scope(Key key, Provider unscoped);

  /**
   * A short but useful description of this scope.  For comparison, the standard
   * scopes that ship with guice use the descriptions
   * {@code "Scopes.SINGLETON"}, {@code "ServletScopes.SESSION"} and
   * {@code "ServletScopes.REQUEST"}.
   */
  String toString();
}

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