Merge branch '5.1.x'

spring-core/src/main/java/org/springframework/core/PriorityOrdered.java

 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,14 +18,19 @@ package org.springframework.core;
 
 /**
  * Extension of the {@link Ordered} interface, expressing a <em>priority</em>
- * ordering: order values expressed by {@code PriorityOrdered} objects
- * always apply before same order values expressed by <em>plain</em>
- * {@link Ordered} objects.
+ * ordering: {@code PriorityOrdered} objects are always applied before
+ * <em>plain</em> {@link Ordered} objects regardless of their order values.
  *
- * <p>This is primarily a special-purpose interface, used for objects where
- * it is particularly important to recognize <em>prioritized</em> objects
- * first, without even obtaining the remaining objects. A typical example:
- * prioritized post-processors in a Spring
+ * <p>When sorting a set of {@code Ordered} objects, {@code PriorityOrdered}
+ * objects and <em>plain</em> {@code Ordered} objects are effectively treated as
+ * two separate subsets, with the set of {@code PriorityOrdered} objects preceding
+ * the set of <em>plain</em> {@code Ordered} objects and with relative
+ * ordering applied within those subsets.
+ *
+ * <p>This is primarily a special-purpose interface, used within the framework
+ * itself for objects where it is particularly important to recognize
+ * <em>prioritized</em> objects first, potentially without even obtaining the
+ * remaining objects. A typical example: prioritized post-processors in a Spring
  * {@link org.springframework.context.ApplicationContext}.
  *
  * <p>Note: {@code PriorityOrdered} post-processor beans are initialized in
@@ -34,10 +39,10 @@ package org.springframework.core;
  * beans which do not require eager initialization for type matching.
  *
  * @author Juergen Hoeller
+ * @author Sam Brannen
  * @since 2.5
  * @see org.springframework.beans.factory.config.PropertyOverrideConfigurer
  * @see org.springframework.beans.factory.config.PropertyPlaceholderConfigurer
  */
 public interface PriorityOrdered extends Ordered {
-
 }