001/* 002 * Copyright 2002-2019 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.core; 018 019/** 020 * Extension of the {@link Ordered} interface, expressing a <em>priority</em> 021 * ordering: {@code PriorityOrdered} objects are always applied before 022 * <em>plain</em> {@link Ordered} objects regardless of their order values. 023 * 024 * <p>When sorting a set of {@code Ordered} objects, {@code PriorityOrdered} 025 * objects and <em>plain</em> {@code Ordered} objects are effectively treated as 026 * two separate subsets, with the set of {@code PriorityOrdered} objects preceding 027 * the set of <em>plain</em> {@code Ordered} objects and with relative 028 * ordering applied within those subsets. 029 * 030 * <p>This is primarily a special-purpose interface, used within the framework 031 * itself for objects where it is particularly important to recognize 032 * <em>prioritized</em> objects first, potentially without even obtaining the 033 * remaining objects. A typical example: prioritized post-processors in a Spring 034 * {@link org.springframework.context.ApplicationContext}. 035 * 036 * <p>Note: {@code PriorityOrdered} post-processor beans are initialized in 037 * a special phase, ahead of other post-processor beans. This subtly 038 * affects their autowiring behavior: they will only be autowired against 039 * beans which do not require eager initialization for type matching. 040 * 041 * @author Juergen Hoeller 042 * @author Sam Brannen 043 * @since 2.5 044 * @see org.springframework.beans.factory.config.PropertyOverrideConfigurer 045 * @see org.springframework.beans.factory.config.PropertyPlaceholderConfigurer 046 */ 047public interface PriorityOrdered extends Ordered { 048}