dubbo Prioritized 源码
dubbo Prioritized 代码
文件路径：/dubbo-common/src/main/java/org/apache/dubbo/common/lang/Prioritized.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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
*
* http://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.apache.dubbo.common.lang;
import java.util.Comparator;
import static java.lang.Integer.compare;
/**
* {@code Prioritized} interface can be implemented by objects that
* should be sorted, for example the tasks in executable queue.
*
* @since 2.7.5
*/
public interface Prioritized extends Comparable<Prioritized> {
/**
* The {@link Comparator} of {@link Prioritized}
*/
Comparator<Object> COMPARATOR = (one, two) -> {
boolean b1 = one instanceof Prioritized;
boolean b2 = two instanceof Prioritized;
if (b1 && !b2) { // one is Prioritized, two is not
return -1;
} else if (b2 && !b1) { // two is Prioritized, one is not
return 1;
} else if (b1 && b2) { // one and two both are Prioritized
return ((Prioritized) one).compareTo((Prioritized) two);
} else { // no different
return 0;
}
};
/**
* The maximum priority
*/
int MAX_PRIORITY = Integer.MIN_VALUE;
/**
* The minimum priority
*/
int MIN_PRIORITY = Integer.MAX_VALUE;
/**
* Normal Priority
*/
int NORMAL_PRIORITY = 0;
/**
* Get the priority
*
* @return the default is {@link #NORMAL_PRIORITY}
*/
default int getPriority() {
return NORMAL_PRIORITY;
}
@Override
default int compareTo(Prioritized that) {
return compare(this.getPriority(), that.getPriority());
}
}
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