com.google.common.cache.CacheStats.missCount 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()
Smart code suggestions by Codota
}

public void testPutAll_populated() {
 for (LoadingCache<Object, Object> cache : caches()) {
  // don't let the entries get GCed
  List<Entry<Object, Object>> warmed = warmUp(cache);
  Object newKey = new Object();
  Object newValue = new Object();
  cache.asMap().putAll(ImmutableMap.of(newKey, newValue));
  // this getUnchecked() call shouldn't be a cache miss; verified below
  assertEquals(newValue, cache.getUnchecked(newKey));
  assertEquals(WARMUP_SIZE, cache.stats().missCount());
  checkValidState(cache);
 }
}

public void testReplace_populated() {
 for (LoadingCache<Object, Object> cache : caches()) {
  // don't let the entries get GCed
  List<Entry<Object, Object>> warmed = warmUp(cache);
  for (int i = WARMUP_MIN; i < WARMUP_MAX; i++) {
   Entry<Object, Object> entry = warmed.get(i - WARMUP_MIN);
   Object newValue = new Object();
   assertSame(entry.getValue(), cache.asMap().replace(entry.getKey(), newValue));
   assertTrue(cache.asMap().replace(entry.getKey(), newValue, entry.getValue()));
   Object newKey = new Object();
   assertNull(cache.asMap().replace(newKey, entry.getValue()));
   assertFalse(cache.asMap().replace(newKey, entry.getValue(), newValue));
   // this getUnchecked() call shouldn't be a cache miss; verified below
   assertEquals(entry.getValue(), cache.getUnchecked(entry.getKey()));
   assertFalse(cache.asMap().containsKey(newKey));
  }
  assertEquals(WARMUP_SIZE, cache.stats().missCount());
  checkValidState(cache);
 }
}

public void testPutIfAbsent_populated() {
 for (LoadingCache<Object, Object> cache : caches()) {
  // don't let the entries get GCed
  List<Entry<Object, Object>> warmed = warmUp(cache);
  for (int i = WARMUP_MIN; i < WARMUP_MAX; i++) {
   Entry<Object, Object> entry = warmed.get(i - WARMUP_MIN);
   Object newValue = new Object();
   assertSame(entry.getValue(), cache.asMap().putIfAbsent(entry.getKey(), newValue));
   Object newKey = new Object();
   assertNull(cache.asMap().putIfAbsent(newKey, entry.getValue()));
   // this getUnchecked() call shouldn't be a cache miss; verified below
   assertEquals(entry.getValue(), cache.getUnchecked(entry.getKey()));
   assertEquals(entry.getValue(), cache.getUnchecked(newKey));
   // don't let the new entry get GCed
   warmed.add(entryOf(newKey, entry.getValue()));
  }
  assertEquals(WARMUP_SIZE, cache.stats().missCount());
  checkValidState(cache);
 }
}

public void testContainsKey_found() {
 for (LoadingCache<Object, Object> cache : caches()) {
  // don't let the entries get GCed
  List<Entry<Object, Object>> warmed = warmUp(cache);
  for (int i = WARMUP_MIN; i < WARMUP_MAX; i++) {
   Entry<Object, Object> entry = warmed.get(i - WARMUP_MIN);
   assertTrue(cache.asMap().containsKey(entry.getKey()));
   assertTrue(cache.asMap().containsValue(entry.getValue()));
   // this getUnchecked() call shouldn't be a cache miss; verified below
   assertEquals(entry.getValue(), cache.getUnchecked(entry.getKey()));
  }
  assertEquals(WARMUP_SIZE, cache.stats().missCount());
  checkValidState(cache);
 }
}

public void testPut_populated() {
 for (LoadingCache<Object, Object> cache : caches()) {
  // don't let the entries get GCed
  List<Entry<Object, Object>> warmed = warmUp(cache);
  for (int i = WARMUP_MIN; i < WARMUP_MAX; i++) {
   Entry<Object, Object> entry = warmed.get(i - WARMUP_MIN);
   Object newValue = new Object();
   assertSame(entry.getValue(), cache.asMap().put(entry.getKey(), newValue));
   // don't let the new entry get GCed
   warmed.add(entryOf(entry.getKey(), newValue));
   Object newKey = new Object();
   assertNull(cache.asMap().put(newKey, entry.getValue()));
   // this getUnchecked() call shouldn't be a cache miss; verified below
   assertEquals(newValue, cache.getUnchecked(entry.getKey()));
   assertEquals(entry.getValue(), cache.getUnchecked(newKey));
   // don't let the new entry get GCed
   warmed.add(entryOf(newKey, entry.getValue()));
  }
  assertEquals(WARMUP_SIZE, cache.stats().missCount());
  checkValidState(cache);
 }
}

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

public void testBulkLoadInterruptedException() {
 Exception e = new InterruptedException();
 CacheLoader<Object, Object> loader = exceptionLoader(e);
 LoadingCache<Object, Object> cache =
   CacheBuilder.newBuilder().recordStats().build(bulkLoader(loader));
 CacheStats stats = cache.stats();
 assertEquals(0, stats.missCount());
 assertEquals(0, stats.loadSuccessCount());
 assertEquals(0, stats.loadExceptionCount());
 assertEquals(0, stats.hitCount());
 try {
  cache.getAll(asList(new Object()));
  fail();
 } catch (ExecutionException expected) {
  assertThat(expected).hasCauseThat().isSameAs(e);
 }
 assertTrue(currentThread().interrupted());
 stats = cache.stats();
 assertEquals(1, stats.missCount());
 assertEquals(0, stats.loadSuccessCount());
 assertEquals(1, stats.loadExceptionCount());
 assertEquals(0, stats.hitCount());
}

public void testBulkLoadCheckedException() {
 Exception e = new Exception();
 CacheLoader<Object, Object> loader = exceptionLoader(e);
 LoadingCache<Object, Object> cache =
   CacheBuilder.newBuilder().recordStats().build(bulkLoader(loader));
 CacheStats stats = cache.stats();
 assertEquals(0, stats.missCount());
 assertEquals(0, stats.loadSuccessCount());
 assertEquals(0, stats.loadExceptionCount());
 assertEquals(0, stats.hitCount());
 try {
  cache.getAll(asList(new Object()));
  fail();
 } catch (ExecutionException expected) {
  assertThat(expected).hasCauseThat().isSameAs(e);
 }
 stats = cache.stats();
 assertEquals(1, stats.missCount());
 assertEquals(0, stats.loadSuccessCount());
 assertEquals(1, stats.loadExceptionCount());
 assertEquals(0, stats.hitCount());
}

public void testRecordStats() {
 CacheBuilder<Object, Object> builder =
   createCacheBuilder().recordStats().concurrencyLevel(1).maximumSize(2);
 LocalLoadingCache<Object, Object> cache = makeCache(builder, identityLoader());
 assertEquals(0, cache.stats().hitCount());
 assertEquals(0, cache.stats().missCount());
 Object one = new Object();
 cache.getUnchecked(one);
 assertEquals(0, cache.stats().hitCount());
 assertEquals(1, cache.stats().missCount());
 cache.getUnchecked(one);
 assertEquals(1, cache.stats().hitCount());
 assertEquals(1, cache.stats().missCount());
 Object two = new Object();
 cache.getUnchecked(two);
 assertEquals(1, cache.stats().hitCount());
 assertEquals(2, cache.stats().missCount());
 Object three = new Object();
 cache.getUnchecked(three);
 assertEquals(1, cache.stats().hitCount());
 assertEquals(3, cache.stats().missCount());
}

public void testBulkLoadError() throws ExecutionException {
 Error e = new Error();
 CacheLoader<Object, Object> loader = errorLoader(e);
 LoadingCache<Object, Object> cache =
   CacheBuilder.newBuilder().recordStats().build(bulkLoader(loader));
 CacheStats stats = cache.stats();
 assertEquals(0, stats.missCount());
 assertEquals(0, stats.loadSuccessCount());
 assertEquals(0, stats.loadExceptionCount());
 assertEquals(0, stats.hitCount());
 try {
  cache.getAll(asList(new Object()));
  fail();
 } catch (ExecutionError expected) {
  assertThat(expected).hasCauseThat().isSameAs(e);
 }
 stats = cache.stats();
 assertEquals(1, stats.missCount());
 assertEquals(0, stats.loadSuccessCount());
 assertEquals(1, stats.loadExceptionCount());
 assertEquals(0, stats.hitCount());
}

public void testBulkLoadUncheckedException() throws ExecutionException {
 Exception e = new RuntimeException();
 CacheLoader<Object, Object> loader = exceptionLoader(e);
 LoadingCache<Object, Object> cache =
   CacheBuilder.newBuilder().recordStats().build(bulkLoader(loader));
 CacheStats stats = cache.stats();
 assertEquals(0, stats.missCount());
 assertEquals(0, stats.loadSuccessCount());
 assertEquals(0, stats.loadExceptionCount());
 assertEquals(0, stats.hitCount());
 try {
  cache.getAll(asList(new Object()));
  fail();
 } catch (UncheckedExecutionException expected) {
  assertThat(expected).hasCauseThat().isSameAs(e);
 }
 stats = cache.stats();
 assertEquals(1, stats.missCount());
 assertEquals(0, stats.loadSuccessCount());
 assertEquals(1, stats.loadExceptionCount());
 assertEquals(0, stats.hitCount());
}

public void testBulkLoadNull() throws ExecutionException {
 LoadingCache<Object, Object> cache =
   CacheBuilder.newBuilder().recordStats().build(bulkLoader(constantLoader(null)));
 CacheStats stats = cache.stats();
 assertEquals(0, stats.missCount());
 assertEquals(0, stats.loadSuccessCount());
 assertEquals(0, stats.loadExceptionCount());
 assertEquals(0, stats.hitCount());
 try {
  cache.getAll(asList(new Object()));
  fail();
 } catch (InvalidCacheLoadException expected) {
 }
 stats = cache.stats();
 assertEquals(1, stats.missCount());
 assertEquals(0, stats.loadSuccessCount());
 assertEquals(1, stats.loadExceptionCount());
 assertEquals(0, stats.hitCount());
}

 /** 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());
 }
}

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());
}

 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(11.0 / requestCount, stats.hitRate());
int missCount = 23;
assertEquals(missCount, stats.missCount());
assertEquals(((double) missCount) / requestCount, stats.missRate());
assertEquals(13, stats.loadSuccessCount());

Javadoc

Returns the number of times Cache lookup methods have returned an uncached (newly loaded) value, or null. Multiple concurrent calls to Cache lookup methods on an absent value can result in multiple misses, all returning the results of a single cache load operation.

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
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
loadExceptionRate
Returns the ratio of cache loading attempts which threw exceptions. This is defined as loadException

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

Best Java code snippets using com.google.common.cache.CacheStats.missCount (Showing top 20 results out of 558)

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