/**
 * 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.apex.malhar.lib.appdata;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ThreadUtils
{
  private ThreadUtils()
  {
  }

  /**
   * Exception handler used for testing threads.
   */
  public static class ExceptionSaverExceptionHandler implements Thread.UncaughtExceptionHandler
  {
    private volatile Throwable caughtThrowable;

    public ExceptionSaverExceptionHandler()
    {
    }

    @Override
    public void uncaughtException(Thread t, Throwable e)
    {
      caughtThrowable.printStackTrace();
      caughtThrowable = e;
    }

    /**
     * Gets the {@link Throwable} caught by this exception handler;
     * @return The {@link Throwable} caught by this exception handler.
     */
    public Throwable getCaughtThrowable()
    {
      return caughtThrowable;
    }
  }

  private static final Logger LOG = LoggerFactory.getLogger(ThreadUtils.class);
}
