dubbo ListenerExporterWrapper 源码

2022-10-20
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dubbo ListenerExporterWrapper 代码

文件路径：/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/listener/ListenerExporterWrapper.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.listener;

import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.utils.CollectionUtils;
import org.apache.dubbo.rpc.Exporter;
import org.apache.dubbo.rpc.ExporterListener;
import org.apache.dubbo.rpc.Invoker;

import java.util.List;
import java.util.function.Consumer;

/**
 * ListenerExporter
 */
public class ListenerExporterWrapper<T> implements Exporter<T> {

    private static final Logger logger = LoggerFactory.getLogger(ListenerExporterWrapper.class);

    private final Exporter<T> exporter;

    private final List<ExporterListener> listeners;

    public ListenerExporterWrapper(Exporter<T> exporter, List<ExporterListener> listeners) {
        if (exporter == null) {
            throw new IllegalArgumentException("exporter == null");
        }
        this.exporter = exporter;
        this.listeners = listeners;
        listenerEvent(listener -> listener.exported(this));
    }

    @Override
    public Invoker<T> getInvoker() {
        return exporter.getInvoker();
    }

    @Override
    public void unexport() {
        try {
            exporter.unexport();
        } finally {
            listenerEvent(listener -> listener.unexported(this));
        }
    }

    private void listenerEvent(Consumer<ExporterListener> consumer) {
        if (CollectionUtils.isNotEmpty(listeners)) {
            RuntimeException exception = null;
            for (ExporterListener listener : listeners) {
                if (listener != null) {
                    try {
                        consumer.accept(listener);
                    } catch (RuntimeException t) {
                        logger.error(t.getMessage(), t);
                        exception = t;
                    }
                }
            }
            if (exception != null) {
                throw exception;
            }
        }
    }
}

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所属分类： 后端技术
本文标签： Java
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