src/com/google/inject/Singleton.java

/**
 * 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;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Target;

/**
 * Apply this to implementation classes when you want only one instance
 * (per {@link Injector}) to be reused for all injections for that binding.
 *
 * @author crazybob@google.com (Bob Lee)
 */
@Target({ ElementType.TYPE, ElementType.METHOD })
@Retention(RUNTIME)
@ScopeAnnotation
public @interface Singleton {}