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.spark.sql.auron;
  
  import static net.bytebuddy.matcher.ElementMatchers.named;
  
  import net.bytebuddy.ByteBuddy;
  import net.bytebuddy.agent.ByteBuddyAgent;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.dynamic.ClassFileLocator;
  import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
  import net.bytebuddy.implementation.MethodDelegation;
  import net.bytebuddy.pool.TypePool;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class ValidateSparkPlanInjector {
  
      private static final Logger logger = LoggerFactory.getLogger(ValidateSparkPlanInjector.class);
      private static boolean injected = false;
  
      public static synchronized void inject() {
          if (injected) {
              logger.warn("ValidateSparkPlan already injected, skipping.");
              return;
          }
          try {
              ByteBuddyAgent.install();
              ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
              TypeDescription typeDescription = TypePool.Default.of(contextClassLoader)
                      .describe("org.apache.spark.sql.execution.adaptive.ValidateSparkPlan$")
                      .resolve();
              new ByteBuddy()
                      .redefine(typeDescription, ClassFileLocator.ForClassLoader.of(contextClassLoader))
                      .method(named("apply"))
                      .intercept(MethodDelegation.to(ValidateSparkPlanApplyInterceptor.class))
                      .make()
                      .load(contextClassLoader, ClassLoadingStrategy.Default.INJECTION);
              logger.info("Successfully injected ValidateSparkPlan.");
              injected = true;
          } catch (TypePool.Resolution.NoSuchTypeException e) {
              logger.debug("No such type of ValidateSparkPlan", e);
          }
      }
  }
  