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+javax.inject</FONT>
+<BR>
+Annotation Type Scope</H2>
+<HR>
+<DL>
+<DT><PRE><FONT SIZE="-1">@Target(value=ANNOTATION_TYPE)
+@Retention(value=RUNTIME)
+@Documented
+</FONT>public @interface <B>Scope</B></DL>
+</PRE>
+
+<P>
+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</code> 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>, <code>@Retention(RUNTIME)</code>,
+ and typically <code>@Documented</code>.</li>
+ <li>should not have attributes.</li>
+ <li>is typically not <code>@Inherited</code>, so scoping is orthogonal to
+ implementation inheritance.</li>
+ <li>may have restricted usage if annotated with <code>@Target</code>. 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</code> 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.
+<P>
+
+<P>
+<DL>
+<DT><B>See Also:</B><DD><A HREF="../../javax/inject/Singleton.html" title="annotation in javax.inject"><CODE>@Singleton</CODE></A></DL>
+
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