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Apache Solr Solrj
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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.solr.common.util;

import java.io.Closeable;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.invoke.MethodHandles;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ObjectReleaseTracker {
  private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  public static Map OBJECTS = new ConcurrentHashMap<>();
  
  public static boolean track(Object object) {
    StringWriter sw = new StringWriter();
    PrintWriter pw = new PrintWriter(sw);
    new ObjectTrackerException().printStackTrace(pw);
    OBJECTS.put(object, sw.toString());
    return true;
  }
  
  public static boolean release(Object object) {
    OBJECTS.remove(object);
    return true;
  }
  
  public static void clear() {
    OBJECTS.clear();
  }
  
  /**
   * @return null if ok else error message
   */
  public static String clearObjectTrackerAndCheckEmpty() {
    String result = checkEmpty();
    
    OBJECTS.clear();
    
    return result;
  }
  
  /**
   * @return null if ok else error message
   */
  public static String checkEmpty() {
    String error = null;
    Set> entries = OBJECTS.entrySet();

    if (entries.size() > 0) {
      List objects = new ArrayList<>();
      for (Entry entry : entries) {
        objects.add(entry.getKey().getClass().getSimpleName());
      }
      
      error = "ObjectTracker found " + entries.size() + " object(s) that were not released!!! " + objects;
      
      System.err.println(error);
      for (Entry entry : entries) {
        System.err.println(entry.getValue());
      }
    }
    
    return error;
  }
  
  public static void tryClose() {
    Set> entries = OBJECTS.entrySet();

    if (entries.size() > 0) {
      for (Entry entry : entries) {
        if (entry.getKey() instanceof Closeable) {
          try {
            ((Closeable)entry.getKey()).close();
          } catch (Throwable t) {
            log.error("", t);
          }
        } else if (entry.getKey() instanceof ExecutorService) {
          try {
            ExecutorUtil.shutdownAndAwaitTermination((ExecutorService)entry.getKey());
          } catch (Throwable t) {
            log.error("", t);
          }
        }
      }
    }
  }
  
  private static class ObjectTrackerException extends RuntimeException {
    
  }

}