/*
 * 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.gobblin.util;

import lombok.Getter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Optional;


/**
 * A type of {@link java.lang.Thread.UncaughtExceptionHandler} that logs uncaught exceptions.
 *
 * @author Yinan Li
 */
public class LoggingUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {

  private final Logger logger;
  @Getter
  private Throwable exception = null;

  public LoggingUncaughtExceptionHandler(Optional<Logger> logger) {
    if (logger.isPresent()) {
      this.logger = logger.get();
    } else {
      this.logger = LoggerFactory.getLogger(LoggingUncaughtExceptionHandler.class);
    }
  }

  @Override
  public void uncaughtException(Thread t, Throwable e) {
    exception = e;
    this.logger.error(String.format("Thread %s threw an uncaught exception: %s", t, e), e);
  }
}
