下面列出了怎么用org.apache.hadoop.mapred.StatisticsCollector.Stat的API类实例代码及写法，或者点击链接到github查看源代码。
@SuppressWarnings("rawtypes")
public void testMovingWindow() throws Exception {
StatisticsCollector collector = new StatisticsCollector(1);
TimeWindow window = new TimeWindow("test", 6, 2);
TimeWindow sincStart = StatisticsCollector.SINCE_START;
TimeWindow[] windows = {sincStart, window};
Stat stat = collector.createStat("m1", windows);
stat.inc(3);
collector.update();
assertEquals(0, stat.getValues().get(window).getValue());
assertEquals(3, stat.getValues().get(sincStart).getValue());
stat.inc(3);
collector.update();
assertEquals((3+3), stat.getValues().get(window).getValue());
assertEquals(6, stat.getValues().get(sincStart).getValue());
stat.inc(10);
collector.update();
assertEquals((3+3), stat.getValues().get(window).getValue());
assertEquals(16, stat.getValues().get(sincStart).getValue());
stat.inc(10);
collector.update();
assertEquals((3+3+10+10), stat.getValues().get(window).getValue());
assertEquals(26, stat.getValues().get(sincStart).getValue());
stat.inc(10);
collector.update();
stat.inc(10);
collector.update();
assertEquals((3+3+10+10+10+10), stat.getValues().get(window).getValue());
assertEquals(46, stat.getValues().get(sincStart).getValue());
stat.inc(10);
collector.update();
assertEquals((3+3+10+10+10+10), stat.getValues().get(window).getValue());
assertEquals(56, stat.getValues().get(sincStart).getValue());
stat.inc(12);
collector.update();
assertEquals((10+10+10+10+10+12), stat.getValues().get(window).getValue());
assertEquals(68, stat.getValues().get(sincStart).getValue());
stat.inc(13);
collector.update();
assertEquals((10+10+10+10+10+12), stat.getValues().get(window).getValue());
assertEquals(81, stat.getValues().get(sincStart).getValue());
stat.inc(14);
collector.update();
assertEquals((10+10+10+12+13+14), stat.getValues().get(window).getValue());
assertEquals(95, stat.getValues().get(sincStart).getValue());
// test Stat class
Map updaters= collector.getUpdaters();
assertEquals(updaters.size(),2);
Map<String, Stat> ststistics=collector.getStatistics();
assertNotNull(ststistics.get("m1"));
Stat newStat= collector.createStat("m2");
assertEquals(newStat.name, "m2");
Stat st=collector.removeStat("m1");
assertEquals(st.name, "m1");
assertEquals((10+10+10+12+13+14), stat.getValues().get(window).getValue());
assertEquals(95, stat.getValues().get(sincStart).getValue());
st=collector.removeStat("m1");
// try to remove stat again
assertNull(st);
collector.start();
// waiting 2,5 sec
Thread.sleep(2500);
assertEquals(69, stat.getValues().get(window).getValue());
assertEquals(95, stat.getValues().get(sincStart).getValue());
}
@SuppressWarnings("rawtypes")
public void testMovingWindow() throws Exception {
StatisticsCollector collector = new StatisticsCollector(1);
TimeWindow window = new TimeWindow("test", 6, 2);
TimeWindow sincStart = StatisticsCollector.SINCE_START;
TimeWindow[] windows = {sincStart, window};
Stat stat = collector.createStat("m1", windows);
stat.inc(3);
collector.update();
assertEquals(0, stat.getValues().get(window).getValue());
assertEquals(3, stat.getValues().get(sincStart).getValue());
stat.inc(3);
collector.update();
assertEquals((3+3), stat.getValues().get(window).getValue());
assertEquals(6, stat.getValues().get(sincStart).getValue());
stat.inc(10);
collector.update();
assertEquals((3+3), stat.getValues().get(window).getValue());
assertEquals(16, stat.getValues().get(sincStart).getValue());
stat.inc(10);
collector.update();
assertEquals((3+3+10+10), stat.getValues().get(window).getValue());
assertEquals(26, stat.getValues().get(sincStart).getValue());
stat.inc(10);
collector.update();
stat.inc(10);
collector.update();
assertEquals((3+3+10+10+10+10), stat.getValues().get(window).getValue());
assertEquals(46, stat.getValues().get(sincStart).getValue());
stat.inc(10);
collector.update();
assertEquals((3+3+10+10+10+10), stat.getValues().get(window).getValue());
assertEquals(56, stat.getValues().get(sincStart).getValue());
stat.inc(12);
collector.update();
assertEquals((10+10+10+10+10+12), stat.getValues().get(window).getValue());
assertEquals(68, stat.getValues().get(sincStart).getValue());
stat.inc(13);
collector.update();
assertEquals((10+10+10+10+10+12), stat.getValues().get(window).getValue());
assertEquals(81, stat.getValues().get(sincStart).getValue());
stat.inc(14);
collector.update();
assertEquals((10+10+10+12+13+14), stat.getValues().get(window).getValue());
assertEquals(95, stat.getValues().get(sincStart).getValue());
// test Stat class
Map updaters= collector.getUpdaters();
assertEquals(updaters.size(),2);
Map<String, Stat> ststistics=collector.getStatistics();
assertNotNull(ststistics.get("m1"));
Stat newStat= collector.createStat("m2");
assertEquals(newStat.name, "m2");
Stat st=collector.removeStat("m1");
assertEquals(st.name, "m1");
assertEquals((10+10+10+12+13+14), stat.getValues().get(window).getValue());
assertEquals(95, stat.getValues().get(sincStart).getValue());
st=collector.removeStat("m1");
// try to remove stat again
assertNull(st);
collector.start();
// waiting 2,5 sec
Thread.sleep(2500);
assertEquals(69, stat.getValues().get(window).getValue());
assertEquals(95, stat.getValues().get(sincStart).getValue());
}
public void testMovingWindow() throws Exception {
StatisticsCollector collector = new StatisticsCollector(1);
TimeWindow window = new TimeWindow("test", 6, 2);
TimeWindow sincStart = StatisticsCollector.SINCE_START;
TimeWindow[] windows = {sincStart, window};
Stat stat = collector.createStat("m1", windows);
stat.inc(3);
collector.update();
assertEquals(0, stat.getValues().get(window).getValue());
assertEquals(3, stat.getValues().get(sincStart).getValue());
stat.inc(3);
collector.update();
assertEquals((3+3), stat.getValues().get(window).getValue());
assertEquals(6, stat.getValues().get(sincStart).getValue());
stat.inc(10);
collector.update();
assertEquals((3+3), stat.getValues().get(window).getValue());
assertEquals(16, stat.getValues().get(sincStart).getValue());
stat.inc(10);
collector.update();
assertEquals((3+3+10+10), stat.getValues().get(window).getValue());
assertEquals(26, stat.getValues().get(sincStart).getValue());
stat.inc(10);
collector.update();
stat.inc(10);
collector.update();
assertEquals((3+3+10+10+10+10), stat.getValues().get(window).getValue());
assertEquals(46, stat.getValues().get(sincStart).getValue());
stat.inc(10);
collector.update();
assertEquals((3+3+10+10+10+10), stat.getValues().get(window).getValue());
assertEquals(56, stat.getValues().get(sincStart).getValue());
stat.inc(12);
collector.update();
assertEquals((10+10+10+10+10+12), stat.getValues().get(window).getValue());
assertEquals(68, stat.getValues().get(sincStart).getValue());
stat.inc(13);
collector.update();
assertEquals((10+10+10+10+10+12), stat.getValues().get(window).getValue());
assertEquals(81, stat.getValues().get(sincStart).getValue());
stat.inc(14);
collector.update();
assertEquals((10+10+10+12+13+14), stat.getValues().get(window).getValue());
assertEquals(95, stat.getValues().get(sincStart).getValue());
}