dubbo ListMerger 源码
dubbo ListMerger 代码
文件路径：/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/merger/ListMerger.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.rpc.cluster.merger;
import org.apache.dubbo.common.utils.ArrayUtils;
import org.apache.dubbo.rpc.cluster.Merger;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class ListMerger implements Merger<List<?>> {
@Override
public List<Object> merge(List<?>... items) {
if (ArrayUtils.isEmpty(items)) {
return Collections.emptyList();
}
return Stream.of(items).filter(Objects::nonNull)
.flatMap(Collection::stream)
.collect(Collectors.toList());
}
}
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