com.alibaba.nacos.naming.core.SubscribeManager Maven / Gradle / Ivy
/*
* 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.naming.core;
import com.alibaba.nacos.naming.pojo.Subscriber;
import com.alibaba.nacos.naming.push.NamingSubscriberServiceAggregationImpl;
import com.alibaba.nacos.naming.push.NamingSubscriberServiceLocalImpl;
import org.apache.commons.collections.CollectionUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;
/**
* Subscribe manager.
*
* @author Nicholas
* @author xiweng.yy
* @since 1.0.1
*/
@Service
public class SubscribeManager {
@Autowired
private NamingSubscriberServiceLocalImpl localService;
@Autowired
private NamingSubscriberServiceAggregationImpl aggregationService;
/**
* Get subscribers.
*
* @param serviceName service name
* @param namespaceId namespace id
* @param aggregation aggregation
* @return list of subscriber
*/
public List getSubscribers(String serviceName, String namespaceId, boolean aggregation) {
if (aggregation) {
Collection result = aggregationService.getFuzzySubscribers(namespaceId, serviceName);
return CollectionUtils.isNotEmpty(result) ? result.stream().filter(distinctByKey(Subscriber::toString))
.collect(Collectors.toList()) : Collections.EMPTY_LIST;
} else {
return new LinkedList<>(localService.getFuzzySubscribers(namespaceId, serviceName));
}
}
public static Predicate distinctByKey(Function keyExtractor) {
Map seen = new ConcurrentHashMap<>(128);
return object -> seen.putIfAbsent(keyExtractor.apply(object), Boolean.TRUE) == null;
}
}