content: /*
   * 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.carbondata.core.util;
  
  import java.lang.reflect.Method;
  
  import org.apache.carbondata.common.logging.LogServiceFactory;
  
  import org.apache.log4j.Logger;
  
  /**
   * This wrapper class is created so that core doesnt have direct dependency on spark
   * TODO: Need to have carbon implementation if carbon needs to be used without spark
   */
  public final class ObjectSizeCalculator {
    /**
     * Logger object for the class
     */
    private static final Logger LOGGER =
        LogServiceFactory.getLogService(ObjectSizeCalculator.class.getName());
  
    /**
     * Class of spark to invoke
     */
    private static String className = "org.apache.spark.util.SizeEstimator";
  
    private static Method estimateMethod = null;
  
    private static boolean methodAccessible = true;
  
    /**
     * Invoke the spark's implementation of Object size computation
     * return the default value passed if function cannot be invoked
     * @param anObject
     * @param defValue
     * @return
     */
    public static long estimate(Object anObject, long defValue) {
      try {
        if (methodAccessible) {
          if (null == estimateMethod) {
            estimateMethod = Class.forName(className).getMethod("estimate", Object.class);
            estimateMethod.setAccessible(true);
          }
          return (Long) estimateMethod.invoke(null, anObject);
        } else {
          return defValue;
        }
      } catch (Throwable ex) {
        // throwable is being caught as external interface is being invoked through reflection
        // and runtime exceptions might get thrown
        LOGGER.error("Could not access method SizeEstimator:estimate.Returning default value", ex);
        methodAccessible = false;
        return defValue;
      }
    }
  }
  