ThreadPoolExhaustedListener 在最新版本中未发现用户配置的入口，这个功能的设计初衷我理解，是发生线程池耗尽通知给应用，目前没看到应用如何添加监听的地方。
/*
 * 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.constants;
import org.apache.dubbo.common.URL;
import java.net.NetworkInterface;
import java.util.Properties;
import java.util.concurrent.ExecutorService;
import java.util.regex.Pattern;
public interface CommonConstants {
    String DUBBO = "dubbo";
    String TRIPLE = "tri";
    String PROVIDER = "provider";
    String CONSUMER = "consumer";
    String APPLICATION_KEY = "application";
    String APPLICATION_VERSION_KEY = "application.version";