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Nacos common pom.xml file

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/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * 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
 *
 *      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 com.alibaba.nacos.common.task.engine;

import com.alibaba.nacos.common.task.NacosTask;
import com.alibaba.nacos.common.task.NacosTaskProcessor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Collection;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Abstract nacos task execute engine.
 *
 * @author xiweng.yy
 */
public abstract class AbstractNacosTaskExecuteEngine implements NacosTaskExecuteEngine {
    
    private final Logger log;
    
    private final ConcurrentHashMap taskProcessors = new ConcurrentHashMap<>();
    
    private NacosTaskProcessor defaultTaskProcessor;
    
    public AbstractNacosTaskExecuteEngine(Logger logger) {
        this.log = null != logger ? logger : LoggerFactory.getLogger(AbstractNacosTaskExecuteEngine.class.getName());
    }
    
    @Override
    public void addProcessor(Object key, NacosTaskProcessor taskProcessor) {
        taskProcessors.putIfAbsent(key, taskProcessor);
    }
    
    @Override
    public void removeProcessor(Object key) {
        taskProcessors.remove(key);
    }
    
    @Override
    public NacosTaskProcessor getProcessor(Object key) {
        return taskProcessors.containsKey(key) ? taskProcessors.get(key) : defaultTaskProcessor;
    }
    
    @Override
    public Collection