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/*
 * 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.hudi.common.util;

import java.util.Arrays;
import java.util.List;

/**
 * Utils for Java threading.
 */
public class ThreadUtils {

  /**
   * Fetches all active threads currently running in the JVM
   */
  public static List collectActiveThreads() {
    ThreadGroup threadGroup = Thread.currentThread().getThreadGroup();
    while (threadGroup.getParent() != null) {
      threadGroup = threadGroup.getParent();
    }

    Thread[] activeThreads = new Thread[threadGroup.activeCount()];
    threadGroup.enumerate(activeThreads);

    return Arrays.asList(activeThreads);
  }

}




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