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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.hadoop.yarn.server.router;

import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Common utility methods used by the Router server.
 *
 */
@Private
@Unstable
public final class RouterServerUtil {

  /** Disable constructor. */
  private RouterServerUtil() {
  }

  public static final Logger LOG =
      LoggerFactory.getLogger(RouterServerUtil.class);

  /**
   * Throws an exception due to an error.
   *
   * @param errMsg the error message
   * @param t the throwable raised in the called class.
   * @throws YarnException on failure
   */
  @Public
  @Unstable
  public static void logAndThrowException(String errMsg, Throwable t)
      throws YarnException {
    if (t != null) {
      LOG.error(errMsg, t);
      throw new YarnException(errMsg, t);
    } else {
      LOG.error(errMsg);
      throw new YarnException(errMsg);
    }
  }

}