com.google.common.cache.CacheStats.loadExceptionRate java code examples

Common ways to obtain CacheStats

private void myMethod () {
 CacheStats c =LoadingCache cache;cache.stats()
Cache cache;cache.stats()
ForwardingCache forwardingCache;forwardingCache.delegate().stats()
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}

@Override
public Number getValue() {
  if (getCache() == null) return Long.valueOf(0);
  return Double.valueOf(getStats().loadExceptionRate() * 100);
}

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());
}

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 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));
}

 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));
 }
}

cacheStatistics.put("loadCount", cacheStats.loadCount());
cacheStatistics.put("loadExceptionCount", cacheStats.loadExceptionCount());
cacheStatistics.put("loadExceptionRate", cacheStats.loadExceptionRate());
cacheStatistics.put("loadSuccessCount", cacheStats.loadSuccessCount());
cacheStatistics.put("missCount", cacheStats.missCount());

  @Override
  public Double getValue() {
    return cache.stats().loadExceptionRate();
  }
});

  @Override
  public Double getValue() {
    return cache.stats().loadExceptionRate();
  }
});

@Override
public double getLoadExceptionRate() {
  return stats().loadExceptionRate();
}

@Override
public double getLoadExceptionRate() {
  return stats().loadExceptionRate();
}

public final double getLoadExceptionRate() {
  return getCachedCacheStats().loadExceptionRate();
}

@Override
public double getLoadExceptionRate() {
  return _cache.stats().loadExceptionRate();
}

public final double getLoadExceptionRate() {
  return getCachedCacheStats().loadExceptionRate();
}

  @Override public Double getValue() {
    return client.stats().incrementBufferStats()
        .loadExceptionRate();
  }
});

  @Override
  public void applyMetrics(Map<String, Object> map) {
    CacheStats stats = cache.stats();
    map.put(prefix + "averageLoadPenalty", stats.averageLoadPenalty());
    map.put(prefix + "evictionCount", stats.evictionCount());
    map.put(prefix + "hitCount", stats.hitCount());
    map.put(prefix + "hitRate", stats.hitRate());
    map.put(prefix + "hitCount", stats.hitCount());
    map.put(prefix + "loadExceptionCount", stats.loadExceptionCount());
    map.put(prefix + "loadExceptionRate", stats.loadExceptionRate());
    map.put(prefix + "loadSuccessCount", stats.loadSuccessCount());
    map.put(prefix + "missCount", stats.missCount());
    map.put(prefix + "missRate", stats.missRate());
    map.put(prefix + "requestCount", stats.requestCount());
    map.put(prefix + "totalLoadTime", stats.totalLoadTime());
  }
}

 public static void instrument(String prefix, Registry registry, Cache<?, ?> cache) {
  registry.gauge(prefix + ".averageLoadPenalty", cache, (c) -> c.stats().averageLoadPenalty());
  registry.gauge(prefix + ".evictionCount", cache, (c) -> c.stats().evictionCount());
  registry.gauge(prefix + ".hitCount", cache, (c) -> c.stats().hitCount());
  registry.gauge(prefix + ".hitRate", cache, (c) -> c.stats().hitRate());
  registry.gauge(prefix + ".loadCount", cache, (c) -> c.stats().loadCount());
  registry.gauge(prefix + ".loadExceptionCount", cache, (c) -> c.stats().loadExceptionCount());
  registry.gauge(prefix + ".loadExceptionRate", cache, (c) -> c.stats().loadExceptionRate());
  registry.gauge(prefix + ".loadSuccessCount", cache, (c) -> c.stats().loadSuccessCount());
  registry.gauge(prefix + ".missCount", cache, (c) -> c.stats().missCount());
  registry.gauge(prefix + ".missRate", cache, (c) -> c.stats().missRate());
  registry.gauge(prefix + ".requestCount", cache, (c) -> c.stats().requestCount());
  registry.gauge(prefix + ".totalLoadTime", cache, (c) -> c.stats().totalLoadTime());
 }
}

metricFactory.registerGauge(cacheName, "loadExceptionRate", () -> cache.stats().loadExceptionRate());

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());
}

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));
}

Javadoc

Returns the ratio of cache loading attempts which threw exceptions. This is defined as loadExceptionCount / (loadSuccessCount + loadExceptionCount), or 0.0 when loadSuccessCount + loadExceptionCount == 0.

Popular methods of CacheStats

hitCount
Returns the number of times Cache lookup methods have returned a cached value.
evictionCount
Returns the number of times an entry has been evicted. This count does not include manual Cache#inva
missCount
Returns the number of times Cache lookup methods have returned an uncached (newly loaded) value, or
loadExceptionCount
Returns the number of times Cache lookup methods threw an exception while loading a new value. This
totalLoadTime
Returns the total number of nanoseconds the cache has spent loading new values. This can be used to
loadSuccessCount
Returns the number of times Cache lookup methods have successfully loaded a new value. This is alway
requestCount
Returns the number of times Cache lookup methods have returned either a cached or uncached value. Th
hitRate
Returns the ratio of cache requests which were hits. This is defined as hitCount / requestCount, or
loadCount
Returns the total number of times that Cache lookup methods attempted to load new values. This inclu
<init>
Constructs a new CacheStats instance.Five parameters of the same type in a row is a bad thing, but t
missRate
Returns the ratio of cache requests which were misses. This is defined as missCount / requestCount,
averageLoadPenalty
Returns the average time spent loading new values. This is defined as totalLoadTime / (loadSuccessCo

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How to use loadExceptionRatemethodin com.google.common.cache.CacheStats

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How to use
loadExceptionRate
method
in
com.google.common.cache.CacheStats