1 | package geniusweb.progress;
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2 |
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3 | import java.util.Date;
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4 |
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5 | import com.fasterxml.jackson.annotation.JsonCreator;
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6 | import com.fasterxml.jackson.annotation.JsonProperty;
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7 | import com.fasterxml.jackson.annotation.JsonTypeName;
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8 |
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9 | import geniusweb.deadline.DeadlineTime;
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10 |
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11 | /**
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12 | * keeps track of progress towards the Deadline and the time/rounds left.
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13 | * immutable. However, the time progresses nevertheless since this refers to the
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14 | * system clocks.
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15 | *
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16 | */
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17 | @JsonTypeName("time")
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18 | public class ProgressTime implements Progress {
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19 |
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20 | /**
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21 | * time in millis as returned from {@link System#currentTimeMillis()}. Note,
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22 | * we do not use RFC 3339 because we need millisecond accuracy.
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23 | */
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24 | private final Date start;
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25 |
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26 | /**
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27 | * duration in millis. we do not use ISO 8601 because we need millisecond
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28 | * accuracy.
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29 | */
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30 | private final Long duration;
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31 |
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32 | @SuppressWarnings("unused") // for deserializer
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33 | private ProgressTime() {
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34 | start = null;
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35 | duration = null;
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36 | }
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37 |
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38 | /**
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39 | *
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40 | * @param duration the duration, eg {@link DeadlineTime#getDuration()}. Must
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41 | * be >0.
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42 | * @param start the start Date (unix time in millisecs since 1970). See
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43 | * {@link System#currentTimeMillis()}.
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44 | */
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45 | @JsonCreator
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46 | public ProgressTime(@JsonProperty("duration") Long d,
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47 | @JsonProperty("start") Date start) {
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48 | this.start = start;
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49 | duration = (d == null || d <= 0) ? 1 : d;
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50 | }
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51 |
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52 | @Override
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53 | public Double get(long currentTimeMs) {
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54 | long delta = currentTimeMs - start.getTime();
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55 | // double should have ~53 digits of precision, and we're computing
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56 | // deltas here.
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57 | // 2^53 millis seems plenty for our purposes so no need to use
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58 | // BigDecimal here.
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59 | Double ratio = delta / (double) duration;
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60 | if (ratio > 1d)
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61 | ratio = 1d;
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62 | else if (ratio < 0d)
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63 | ratio = 0d;
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64 | return ratio;
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65 | }
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66 |
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67 | @Override
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68 | public boolean isPastDeadline(long currentTimeMs) {
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69 | return currentTimeMs > start.getTime() + duration;
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70 | }
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71 |
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72 | /**
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73 | *
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74 | * @return time measured in milliseconds, between the start time and
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75 | * midnight, January 1, 1970 UTCas returned from
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76 | * {@link System#currentTimeMillis()}
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77 | *
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78 | */
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79 | public Date getStart() {
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80 | return start;
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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 | * @return duration in milliseconds.
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86 | */
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87 | public Long getDuration() {
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88 | return duration;
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89 | }
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90 |
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91 | @Override
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92 | public Date getTerminationTime() {
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93 | return new Date(start.getTime() + duration);
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94 | }
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95 |
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96 | @Override
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97 | public String toString() {
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98 | return "ProgressTime[" + start.getTime() + " , " + duration + "ms]";
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99 | }
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100 |
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101 | @Override
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102 | public int hashCode() {
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103 | final int prime = 31;
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104 | int result = 1;
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105 | result = prime * result
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106 | + ((duration == null) ? 0 : duration.hashCode());
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107 | result = prime * result + ((start == null) ? 0 : start.hashCode());
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108 | return result;
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109 | }
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110 |
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111 | @Override
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112 | public boolean equals(Object obj) {
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113 | if (this == obj)
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114 | return true;
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115 | if (obj == null)
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116 | return false;
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117 | if (getClass() != obj.getClass())
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118 | return false;
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119 | ProgressTime other = (ProgressTime) obj;
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120 | if (duration == null) {
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121 | if (other.duration != null)
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122 | return false;
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123 | } else if (!duration.equals(other.duration))
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124 | return false;
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125 | if (start == null) {
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126 | if (other.start != null)
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127 | return false;
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128 | } else if (!start.equals(other.start))
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129 | return false;
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130 | return true;
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131 | }
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132 |
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133 | }
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