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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.cassandra.index.sai.utils;
  
  import java.util.List;
  
  import org.junit.rules.TestRule;
  import org.junit.runner.Description;
  import org.junit.runners.model.Statement;
  
  import com.carrotsearch.randomizedtesting.rules.StatementAdapter;
  import org.apache.cassandra.inject.Injections;
  import org.apache.cassandra.inject.InvokePointBuilder;
  
  import static org.junit.Assert.assertEquals;
  
  public class ResourceLeakDetector implements TestRule
  {
      private static final Injections.Counter RESOURCE_LEAK_COUNTER = Injections.newCounter("ResourceLeakCounter")
                                                                                .add(InvokePointBuilder.newInvokePoint()
                                                                                                       .onClass("org.apache.cassandra.utils.concurrent.Ref$State")
                                                                                                       .onMethod("reportLeak"))
                                                                                .build();
  
      @Override
      public Statement apply(Statement statement, Description description)
      {
          return new StatementAdapter(statement)
          {
              @Override
              protected void before() throws Throwable
              {
                  ResourceLeakDetector.this.before();
              }
  
              @Override
              protected void afterAlways(List<Throwable> errors)
              {
                  ResourceLeakDetector.this.afterAlways();
              }
  
              @Override
              protected void afterIfSuccessful()
              {
                  ResourceLeakDetector.this.afterIfSuccessful();
              }
          };
      }
  
      protected void before() throws Throwable
      {
          Injections.inject(RESOURCE_LEAK_COUNTER);
      }
  
      protected void afterIfSuccessful()
      {
          assertEquals("Resource leaks were detected during this test. Add -Dcassandra.debugrefcount=true to analyze the leaks", 0, RESOURCE_LEAK_COUNTER.get());
      }
  
      protected void afterAlways()
      {
          Injections.deleteAll();
          RESOURCE_LEAK_COUNTER.reset();
      }
  }
  