@Cacheable增加定时更新缓存功能

src/javax/persistence/Cacheable.java

@@ -1,4 +1,4 @@
-/*******************************************************************************
+/** *****************************************************************************
  * Copyright (c) 2008 - 2013 Oracle Corporation. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
@@ -12,7 +12,7 @@
  *     Linda DeMichiel - Java Persistence 2.1
  *     Linda DeMichiel - Java Persistence 2.0
  *
- ******************************************************************************/ 
+ ***************************************************************************** */
 package javax.persistence;
 
 import static java.lang.annotation.ElementType.TYPE;
@@ -27,19 +27,28 @@ import java.lang.annotation.Target;
  * The value of the <code>Cacheable</code> annotation is inherited by
  * subclasses; it can be overridden by specifying
  * <code>Cacheable</code> on a subclass.
- * 
- * <p> <code>Cacheable(false)</code> means that the entity and its state must 
+ *
+ * <p>
+ * <code>Cacheable(false)</code> means that the entity and its state must
  * not be cached by the provider.
- * 
+ *
  * @since Java Persistence 2.0
  */
-@Target( { TYPE })
+@Target({TYPE})
 @Retention(RUNTIME)
 public @interface Cacheable {
 
     /**
      * (Optional) Whether or not the entity should be cached.
+     *
      * @return boolean
      */
     boolean value() default true;
+
+    /**
+     * (Optional) 定时自动更新缓存的周期秒数，为0表示不做定时更新， 大于0表示每经过interval秒后会自动从数据库中拉取数据更新Cache
+     *
+     * @return
+     */
+    int interval() default 0;
 }