spring Ordered 源码
spring Ordered 代码
文件路径：/spring-core/src/main/java/org/springframework/core/Ordered.java
/*
* 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;
/**
* {@code Ordered} is an interface that can be implemented by objects that
* should be <em>orderable</em>, for example in a {@code Collection}.
*
* <p>The actual {@link #getOrder() order} can be interpreted as prioritization,
* with the first object (with the lowest order value) having the highest
* priority.
*
* <p>Note that there is also a <em>priority</em> marker for this interface:
* {@link PriorityOrdered}. Consult the Javadoc for {@code PriorityOrdered} for
* details on how {@code PriorityOrdered} objects are ordered relative to
* <em>plain</em> {@link Ordered} objects.
*
* <p>Consult the Javadoc for {@link OrderComparator} for details on the
* sort semantics for non-ordered objects.
*
* @author Juergen Hoeller
* @author Sam Brannen
* @since 07.04.2003
* @see PriorityOrdered
* @see OrderComparator
* @see org.springframework.core.annotation.Order
* @see org.springframework.core.annotation.AnnotationAwareOrderComparator
*/
public interface Ordered {
/**
* Useful constant for the highest precedence value.
* @see java.lang.Integer#MIN_VALUE
*/
int HIGHEST_PRECEDENCE = Integer.MIN_VALUE;
/**
* Useful constant for the lowest precedence value.
* @see java.lang.Integer#MAX_VALUE
*/
int LOWEST_PRECEDENCE = Integer.MAX_VALUE;
/**
* Get the order value of this object.
* <p>Higher values are interpreted as lower priority. As a consequence,
* the object with the lowest value has the highest priority (somewhat
* analogous to Servlet {@code load-on-startup} values).
* <p>Same order values will result in arbitrary sort positions for the
* affected objects.
* @return the order value
* @see #HIGHEST_PRECEDENCE
* @see #LOWEST_PRECEDENCE
*/
int getOrder();
}
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