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+/*
+ * Copyright (C) 2009 The JSR-330 Expert Group
+ *
+ * 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 javax.inject;
+
+import java.lang.annotation.Target;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Documented;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
+
+/**
+ * Identifies scope annotations. A scope annotation applies to a class
+ * containing an injectable constructor and governs how the injector reuses
+ * instances of the type. By default, if no scope annotation is present, the
+ * injector creates an instance (by injecting the type's constructor), uses
+ * the instance for one injection, and then forgets it. If a scope annotation
+ * is present, the injector may retain the instance for possible reuse in a
+ * later injection. If multiple threads can access a scoped instance, its
+ * implementation should be thread safe. The implementation of the scope
+ * itself is left up to the injector.
+ *
+ * <p>In the following example, the scope annotation {@code @Singleton} ensures
+ * that we only have one Log instance:
+ *
+ * <pre>
+ *   &#064;Singleton
+ *   class Log {
+ *     void log(String message) { ... }
+ *   }</pre>
+ * 
+ * <p>The injector generates an error if it encounters more than one scope
+ * annotation on the same class or a scope annotation it doesn't support.
+ *
+ * <p>A scope annotation:
+ * <ul>
+ *   <li>is annotated with {@code @Scope}, {@code @Retention(RUNTIME)},
+ *      and typically {@code @Documented}.</li>
+ *   <li>should not have attributes.</li>
+ *   <li>is typically not {@code @Inherited}, so scoping is orthogonal to
+ *      implementation inheritance.</li>
+ *   <li>may have restricted usage if annotated with {@code @Target}. While
+ *      this specification covers applying scopes to classes only, some 
+ *      injector configurations might use scope annotations
+ *      in other places (on factory method results for example).</li>
+ * </ul>
+ *
+ * <p>For example:
+ *
+ * <pre>
+ *   &#064;java.lang.annotation.Documented
+ *   &#064;java.lang.annotation.Retention(RUNTIME)
+ *   &#064;javax.inject.Scope
+ *   public @interface RequestScoped {}</pre>
+ *
+ * <p>Annotating scope annotations with {@code @Scope} helps the injector
+ * detect the case where a programmer used the scope annotation on a class but
+ * forgot to configure the scope in the injector. A conservative injector
+ * would generate an error rather than not apply a scope.
+ *
+ * @see javax.inject.Singleton @Singleton
+ */
+@Target(ANNOTATION_TYPE)
+@Retention(RUNTIME)
+@Documented
+public @interface Scope {}