How to use

evictionCount

method

in

com.google.common.cache.CacheStats

@Override
public Number getValue() {
  if (getCache() == null) return Long.valueOf(0);
  return Double.valueOf(getStats().evictionCount());
}

@com.netflix.servo.annotations.Monitor(name = "evictionCount", type = COUNTER)
long evictionCount() {
 return memoStats.get().evictionCount();
}

@Override
public LookupCacheStats getStats()
{
 return new LookupCacheStats(
   cache.stats().hitCount(),
   cache.stats().missCount(),
   cache.stats().evictionCount()
 );
}

assertEquals(removalListener.size(), stats.evictionCount());
assertEquals(computeCount.get(), stats.loadSuccessCount());
assertEquals(exceptionCount.get() + computeNullCount.get(), stats.loadExceptionCount());

 /** Increments all counters by the values in {@code other}. */
 public void incrementBy(StatsCounter other) {
  CacheStats otherStats = other.snapshot();
  hitCount.add(otherStats.hitCount());
  missCount.add(otherStats.missCount());
  loadSuccessCount.add(otherStats.loadSuccessCount());
  loadExceptionCount.add(otherStats.loadExceptionCount());
  totalLoadTime.add(otherStats.totalLoadTime());
  evictionCount.add(otherStats.evictionCount());
 }
}

 /** Increments all counters by the values in {@code other}. */
 public void incrementBy(StatsCounter other) {
  CacheStats otherStats = other.snapshot();
  hitCount.add(otherStats.hitCount());
  missCount.add(otherStats.missCount());
  loadSuccessCount.add(otherStats.loadSuccessCount());
  loadExceptionCount.add(otherStats.loadExceptionCount());
  totalLoadTime.add(otherStats.totalLoadTime());
  evictionCount.add(otherStats.evictionCount());
 }
}

 /** Increments all counters by the values in {@code other}. */
 public void incrementBy(StatsCounter other) {
  CacheStats otherStats = other.snapshot();
  hitCount.add(otherStats.hitCount());
  missCount.add(otherStats.missCount());
  loadSuccessCount.add(otherStats.loadSuccessCount());
  loadExceptionCount.add(otherStats.loadExceptionCount());
  totalLoadTime.add(otherStats.totalLoadTime());
  evictionCount.add(otherStats.evictionCount());
 }
}

assertEquals(removalListener.size(), stats.evictionCount());
assertEquals(computeCount.get(), stats.loadSuccessCount());
assertEquals(exceptionCount.get() + computeNullCount.get(), stats.loadExceptionCount());

@Override
public CacheStats stats() {
 com.google.common.cache.CacheStats stats = statsCounter.snapshot().plus(cache.stats());
 return new CacheStats(stats.hitCount(), stats.missCount(), stats.loadSuccessCount(),
   stats.loadExceptionCount(), stats.totalLoadTime(), stats.evictionCount(), 0L);
}

assertTrue(totalLoadTime >= 0);
assertTrue(stats.averageLoadPenalty() >= 0.0);
assertEquals(0, stats.evictionCount());
assertEquals(1.0 / 2, stats.missRate());
assertEquals(1, stats.loadCount());
assertEquals(0, stats.evictionCount());
totalLoadTime = stats.totalLoadTime();
assertTrue(stats.averageLoadPenalty() >= 0.0);
assertEquals(0, stats.evictionCount());
totalLoadTime = stats.totalLoadTime();
assertTrue(stats.averageLoadPenalty() >= 0.0);
assertEquals(1, stats.evictionCount());

public void testEmptySimpleStats() {
 StatsCounter counter = new SimpleStatsCounter();
 CacheStats stats = counter.snapshot();
 assertEquals(0, stats.requestCount());
 assertEquals(0, stats.hitCount());
 assertEquals(1.0, stats.hitRate());
 assertEquals(0, stats.missCount());
 assertEquals(0.0, stats.missRate());
 assertEquals(0, stats.loadSuccessCount());
 assertEquals(0, stats.loadExceptionCount());
 assertEquals(0, stats.loadCount());
 assertEquals(0, stats.totalLoadTime());
 assertEquals(0.0, stats.averageLoadPenalty());
 assertEquals(0, stats.evictionCount());
}

public void testEmpty() {
 CacheStats stats = new CacheStats(0, 0, 0, 0, 0, 0);
 assertEquals(0, stats.requestCount());
 assertEquals(0, stats.hitCount());
 assertEquals(1.0, stats.hitRate());
 assertEquals(0, stats.missCount());
 assertEquals(0.0, stats.missRate());
 assertEquals(0, stats.loadSuccessCount());
 assertEquals(0, stats.loadExceptionCount());
 assertEquals(0.0, stats.loadExceptionRate());
 assertEquals(0, stats.loadCount());
 assertEquals(0, stats.totalLoadTime());
 assertEquals(0.0, stats.averageLoadPenalty());
 assertEquals(0, stats.evictionCount());
}

public void testSingle() {
 CacheStats stats = new CacheStats(11, 13, 17, 19, 23, 27);
 assertEquals(24, stats.requestCount());
 assertEquals(11, stats.hitCount());
 assertEquals(11.0 / 24, stats.hitRate());
 assertEquals(13, stats.missCount());
 assertEquals(13.0 / 24, stats.missRate());
 assertEquals(17, stats.loadSuccessCount());
 assertEquals(19, stats.loadExceptionCount());
 assertEquals(19.0 / 36, stats.loadExceptionRate());
 assertEquals(17 + 19, stats.loadCount());
 assertEquals(23, stats.totalLoadTime());
 assertEquals(23.0 / (17 + 19), stats.averageLoadPenalty());
 assertEquals(27, stats.evictionCount());
}

assertTrue(totalLoadTime >= 0);
assertTrue(stats.averageLoadPenalty() >= 0.0);
assertEquals(0, stats.evictionCount());
assertEquals(1.0/2, stats.missRate());
assertEquals(1, stats.loadCount());
assertEquals(0, stats.evictionCount());
totalLoadTime = stats.totalLoadTime();
assertTrue(stats.averageLoadPenalty() >= 0.0);
assertEquals(0, stats.evictionCount());
totalLoadTime = stats.totalLoadTime();
assertTrue(stats.averageLoadPenalty() >= 0.0);
assertEquals(1, stats.evictionCount());

 public void testPlus() {
  CacheStats one = new CacheStats(11, 13, 15, 13, 11, 9);
  CacheStats two = new CacheStats(53, 47, 41, 39, 37, 35);

  CacheStats sum = two.plus(one);
  assertEquals(124, sum.requestCount());
  assertEquals(64, sum.hitCount());
  assertEquals(64.0 / 124, sum.hitRate());
  assertEquals(60, sum.missCount());
  assertEquals(60.0 / 124, sum.missRate());
  assertEquals(56, sum.loadSuccessCount());
  assertEquals(52, sum.loadExceptionCount());
  assertEquals(52.0 / 108, sum.loadExceptionRate());
  assertEquals(56 + 52, sum.loadCount());
  assertEquals(48, sum.totalLoadTime());
  assertEquals(48.0 / (56 + 52), sum.averageLoadPenalty());
  assertEquals(44, sum.evictionCount());

  assertEquals(sum, one.plus(two));
 }
}

public void testMinus() {
 CacheStats one = new CacheStats(11, 13, 17, 19, 23, 27);
 CacheStats two = new CacheStats(53, 47, 43, 41, 37, 31);
 CacheStats diff = two.minus(one);
 assertEquals(76, diff.requestCount());
 assertEquals(42, diff.hitCount());
 assertEquals(42.0 / 76, diff.hitRate());
 assertEquals(34, diff.missCount());
 assertEquals(34.0 / 76, diff.missRate());
 assertEquals(26, diff.loadSuccessCount());
 assertEquals(22, diff.loadExceptionCount());
 assertEquals(22.0 / 48, diff.loadExceptionRate());
 assertEquals(26 + 22, diff.loadCount());
 assertEquals(14, diff.totalLoadTime());
 assertEquals(14.0 / (26 + 22), diff.averageLoadPenalty());
 assertEquals(4, diff.evictionCount());
 assertEquals(new CacheStats(0, 0, 0, 0, 0, 0), one.minus(two));
}

assertEquals(214, stats.totalLoadTime());
assertEquals(214.0 / (13 + 17), stats.averageLoadPenalty());
assertEquals(27, stats.evictionCount());

final Map<String, Object> cacheStatistics = new HashMap<String, Object>(11);
cacheStatistics.put("averageLoadPenalty", cacheStats.averageLoadPenalty());
cacheStatistics.put("evictionCount", cacheStats.evictionCount());
cacheStatistics.put("hitCount", cacheStats.hitCount());
cacheStatistics.put("hitRate", cacheStats.hitRate());

cacheMissTotal.addMetric(cacheName, stats.missCount());
cacheRequestsTotal.addMetric(cacheName, stats.requestCount());
cacheEvictionTotal.addMetric(cacheName, stats.evictionCount());
cacheSize.addMetric(cacheName, c.getValue().size());

@Override
public void init(Context context) {
 super.init(context);
 TableMetricsUtil tableMetricsUtil = new TableMetricsUtil(context, this, tableId);
 // hit- and miss-rate are provided by CachingTable.
 tableMetricsUtil.newGauge("evict-count", () -> cache.stats().evictionCount());
}