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annotate truffle/com.oracle.truffle.object/src/com/oracle/truffle/object/DebugCounter.java @ 22548:6b76a24fffbd default tip

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author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 14 Jan 2016 14:20:57 +0100
parents c3ea80aa5762
children
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1 /*
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2 * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.truffle.object;
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24
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25 import java.io.PrintStream;
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26 import java.util.ArrayList;
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27 import java.util.concurrent.atomic.AtomicLong;
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28
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29 public abstract class DebugCounter {
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30 private DebugCounter() {
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31 }
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32
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33 public abstract long get();
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34
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35 public abstract void inc();
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36
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37 public static DebugCounter create(String name) {
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38 return ObjectStorageOptions.DebugCounters ? DebugCounterImpl.createImpl(name) : Dummy.INSTANCE;
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39 }
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40
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41 public static void dumpCounters() {
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42 if (ObjectStorageOptions.DebugCounters) {
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43 DebugCounterImpl.dumpCounters(System.out);
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44 }
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45 }
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46
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47 private static final class DebugCounterImpl extends DebugCounter {
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48 private static final ArrayList<DebugCounter> allCounters = new ArrayList<>();
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49
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50 private final String name;
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51 private final AtomicLong value;
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52
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53 private DebugCounterImpl(String name) {
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54 this.name = name;
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55 this.value = new AtomicLong();
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56 allCounters.add(this);
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57 }
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58
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59 private static DebugCounter createImpl(String name) {
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60 return new DebugCounterImpl(name);
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61 }
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62
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63 @Override
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64 public long get() {
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65 return value.get();
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66 }
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67
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68 @Override
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69 public void inc() {
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70 value.incrementAndGet();
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71 }
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72
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73 @Override
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74 public String toString() {
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75 return name + ": " + get();
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76 }
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77
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78 private static void dumpCounters(PrintStream out) {
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79 for (DebugCounter counter : allCounters) {
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80 out.println(counter);
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81 }
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82 }
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83 }
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84
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85 private static final class Dummy extends DebugCounter {
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86 static final DebugCounter INSTANCE = new Dummy();
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87
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88 private Dummy() {
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89 }
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90
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91 @Override
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92 public long get() {
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93 return 0;
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94 }
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95
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96 @Override
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97 public void inc() {
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98 }
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99 }
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100 }