source: timeline/src/main/java/geniusweb/progress/ProgressTime.java@ 3

Last change on this file since 3 was 1, checked in by bart, 5 years ago

Initial Release

File size: 3.1 KB
Line 
1package geniusweb.progress;
2
3import java.util.Date;
4
5import com.fasterxml.jackson.annotation.JsonCreator;
6import com.fasterxml.jackson.annotation.JsonProperty;
7import com.fasterxml.jackson.annotation.JsonTypeName;
8
9import geniusweb.deadline.DeadlineTime;
10
11/**
12 * keeps track of progress towards the Deadline and the time/rounds left.
13 * immutable. However, the time progresses nevertheless since this refers to the
14 * system clocks.
15 *
16 */
17@JsonTypeName("time")
18public class ProgressTime implements Progress {
19
20 /**
21 * time in millis as returned from {@link System#currentTimeMillis()}. Note,
22 * we do not use RFC 3339 because we need millisecond accuracy.
23 */
24 private final Date start;
25
26 /**
27 * duration in millis. we do not use ISO 8601 because we need millisecond
28 * accuracy.
29 */
30 private final Long duration;
31
32 @SuppressWarnings("unused") // for deserializer
33 private ProgressTime() {
34 start = null;
35 duration = null;
36 }
37
38 /**
39 *
40 * @param duration the duration, eg {@link DeadlineTime#getDuration()}. Must
41 * be >0.
42 * @param start the start Date (unix time in millisecs since 1970). See
43 * {@link System#currentTimeMillis()}.
44 */
45 @JsonCreator
46 public ProgressTime(@JsonProperty("duration") Long d,
47 @JsonProperty("start") Date start) {
48 this.start = start;
49 duration = (d == null || d <= 0) ? 1 : d;
50 }
51
52 @Override
53 public Double get(long currentTimeMs) {
54 long delta = currentTimeMs - start.getTime();
55 // double should have ~53 digits of precision, and we're computing
56 // deltas here.
57 // 2^53 millis seems plenty for our purposes so no need to use
58 // BigDecimal here.
59 Double ratio = delta / (double) duration;
60 if (ratio > 1d)
61 ratio = 1d;
62 else if (ratio < 0d)
63 ratio = 0d;
64 return ratio;
65 }
66
67 @Override
68 public boolean isPastDeadline(long currentTimeMs) {
69 return currentTimeMs > start.getTime() + duration;
70 }
71
72 /**
73 *
74 * @return time measured in milliseconds, between the start time and
75 * midnight, January 1, 1970 UTCas returned from
76 * {@link System#currentTimeMillis()}
77 *
78 */
79 public Date getStart() {
80 return start;
81 }
82
83 /**
84 *
85 * @return duration in milliseconds.
86 */
87 public Long getDuration() {
88 return duration;
89 }
90
91 @Override
92 public Date getTerminationTime() {
93 return new Date(start.getTime() + duration);
94 }
95
96 @Override
97 public String toString() {
98 return "ProgressTime[" + start.getTime() + " , " + duration + "ms]";
99 }
100
101 @Override
102 public int hashCode() {
103 final int prime = 31;
104 int result = 1;
105 result = prime * result
106 + ((duration == null) ? 0 : duration.hashCode());
107 result = prime * result + ((start == null) ? 0 : start.hashCode());
108 return result;
109 }
110
111 @Override
112 public boolean equals(Object obj) {
113 if (this == obj)
114 return true;
115 if (obj == null)
116 return false;
117 if (getClass() != obj.getClass())
118 return false;
119 ProgressTime other = (ProgressTime) obj;
120 if (duration == null) {
121 if (other.duration != null)
122 return false;
123 } else if (!duration.equals(other.duration))
124 return false;
125 if (start == null) {
126 if (other.start != null)
127 return false;
128 } else if (!start.equals(other.start))
129 return false;
130 return true;
131 }
132
133}
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