Java tutorial
/* * 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. * You may obtain a copy of the License at * * https://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 org.springframework.core; /** * Extension of the {@link Ordered} interface, expressing a <em>priority</em> * ordering: {@code PriorityOrdered} objects are always applied before * <em>plain</em> {@link Ordered} objects regardless of their order values. * * <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 * a special phase, ahead of other post-processor beans. This subtly * affects their autowiring behavior: they will only be autowired against * 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 { }