| /* |
| * 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.openjpa.enhance.stats; |
| |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.Timer; |
| import java.util.TimerTask; |
| import java.util.TreeSet; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.apache.openjpa.lib.log.Log; |
| import org.apache.openjpa.lib.util.Localizer; |
| import org.apache.openjpa.meta.ClassMetaData; |
| |
| /** |
| * FetchStatsCollector aggregates fetch statistics and outputs the data periodically (10 minutes). |
| */ |
| public final class FetchStatsCollector { |
| // Fully qualified persistent field name -> number of access |
| private static ConcurrentHashMap<String, AtomicInteger> _used = new ConcurrentHashMap<>(); |
| private static Set<String> _entities = new TreeSet<>(); |
| |
| private static Log _log; |
| private static final Localizer _loc = Localizer.forPackage(FetchStatsCollector.class); |
| // default to 10 min |
| private final static int DEFAULT_INTERVAL = 10 * 60 * 1000; |
| private static Timer timer; |
| |
| public static void setlogger(Log log) { |
| if (FetchStatsCollector._log == null) { |
| FetchStatsCollector._log = log; |
| FetchStatsCollector._log.info(_loc.get("start-monitoring")); |
| } |
| } |
| |
| static { |
| Runtime.getRuntime().addShutdownHook(new Shutdown()); |
| AccessController.doPrivileged(new PrivilegedAction<Object>() { |
| @Override |
| public Object run() { |
| TimerTask statsOutputTask = new TimerTask() { |
| @Override |
| public void run() { |
| dump(); |
| } |
| }; |
| timer = new Timer(); |
| timer.schedule(statsOutputTask, DEFAULT_INTERVAL, DEFAULT_INTERVAL); |
| return null; |
| } |
| }); |
| } |
| |
| public static void registerEntity(ClassMetaData cmd) { |
| _entities.add(cmd.getDescribedTypeString()); |
| } |
| |
| public static AtomicInteger registerField(String field) { |
| return _used.putIfAbsent(field, new AtomicInteger(0)); |
| } |
| |
| public static void hit(String field) { |
| AtomicInteger value = _used.get(field); |
| if (value != null) { |
| value.incrementAndGet(); |
| } |
| } |
| |
| static class Shutdown extends Thread { |
| @Override |
| public void run() { |
| timer.cancel(); |
| dump(); |
| } |
| } |
| |
| public static Set<String> getStatistics() { |
| // TreeSet for a sorted set. |
| Set<String> noAccess = new TreeSet<>(); |
| for (Map.Entry<String, AtomicInteger> entry : _used.entrySet()) { |
| if (entry.getValue().intValue() == 0) { |
| noAccess.add(entry.getKey()); |
| } |
| } |
| |
| return noAccess; |
| } |
| |
| public static void dump() { |
| Set<String> zeroAccessFieldSet = getStatistics(); |
| |
| StringBuilder message = new StringBuilder(); |
| message.append(_loc.get("fields-never-fetched", |
| new Object[] { _entities, zeroAccessFieldSet.size()}).getMessage()); |
| |
| for (String field : zeroAccessFieldSet) { |
| message.append("\n\t" + field); |
| |
| } |
| _log.info(message); |
| } |
| |
| public static void clear() { |
| for (Map.Entry<String, AtomicInteger> entry : _used.entrySet()) { |
| entry.setValue(new AtomicInteger(0)); |
| } |
| } |
| |
| static class Container { |
| String _name; |
| Integer _value; |
| |
| public Container(String name, int value) { |
| _name = name; |
| _value = value; |
| } |
| |
| String getName() { |
| return _name; |
| } |
| |
| public Integer getValue() { |
| return _value; |
| } |
| |
| @Override |
| public String toString() { |
| return _name; |
| } |
| } |
| } |