Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/profile/Clock.java @ 4184:fa6b78681c54
Added copyright check to the gate.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 03 Jan 2012 12:37:31 +0100 |
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1 /* |
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2 * Copyright (c) 2007, 2011, 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.sun.max.profile; |
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24 |
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25 /** |
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26 * The {@code Clock} class represents a clock source that has a continuously increasing tick |
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27 * count. A clock can be used to produce a relative timing between events by comparing the |
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28 * number of ticks between events. This can be used to implement time-based profiling |
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29 * by using a clock based on the system time. |
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30 */ |
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31 public abstract class Clock { |
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32 |
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33 public abstract long getTicks(); |
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34 |
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35 /** |
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36 * Gets the resolution of this clock as the number of {@linkplain #getTicks() ticks} per second. |
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37 * @return the resolution of the clock |
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38 */ |
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39 public abstract long getHZ(); |
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40 |
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41 public static final Clock SYSTEM_NANOSECONDS = new SystemNS(); |
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42 public static final Clock SYSTEM_MILLISECONDS = new SystemMS(); |
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43 |
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44 private static class SystemMS extends Clock { |
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45 @Override |
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46 public long getTicks() { |
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47 return System.currentTimeMillis(); |
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48 } |
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49 @Override |
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50 public long getHZ() { |
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51 return 1000; |
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52 } |
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53 } |
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54 |
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55 private static class SystemNS extends Clock { |
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56 @Override |
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57 public long getTicks() { |
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58 return System.nanoTime(); |
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59 } |
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60 @Override |
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61 public long getHZ() { |
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62 return 1000000000; |
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63 } |
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64 } |
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65 |
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66 public static int[] sampleDeltas(Clock clock, int numberOfSamples) { |
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67 final int[] result = new int[numberOfSamples]; |
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68 long sample = clock.getTicks(); |
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69 for (int i = 0; i < numberOfSamples; i++) { |
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70 final long newSample = clock.getTicks(); |
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71 result[i] = (int) (newSample - sample); |
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72 sample = newSample; |
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73 } |
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74 return result; |
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75 } |
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76 |
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77 public static void sample5(Clock clock, long[] samples) { |
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78 final long sample0 = clock.getTicks(); |
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79 final long sample1 = clock.getTicks(); |
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80 final long sample2 = clock.getTicks(); |
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81 final long sample3 = clock.getTicks(); |
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82 final long sample4 = clock.getTicks(); |
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83 samples[0] = sample0; |
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84 samples[1] = sample1; |
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85 samples[2] = sample2; |
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86 samples[3] = sample3; |
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87 samples[4] = sample4; |
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88 } |
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89 } |