io.micrometer.core.instrument.binder.cache

Class JCacheMetrics

java.lang.Object

io.micrometer.core.instrument.binder.cache.CacheMeterBinder

io.micrometer.core.instrument.binder.cache.JCacheMetrics

All Implemented Interfaces:

MeterBinder

@NonNullApi
 @NonNullFields
public class JCacheMetrics
extends CacheMeterBinder

Collect metrics on JSR-107 JCache caches, including detailed metrics on manual puts and removals. See https://github.com/jsr107/demo/blob/master/src/test/java/javax/cache/core/StatisticsExample.java

Note that JSR-107 does not provide any insight into the size or estimated size of the cache, so the size metric of a JCache cache will always report 0.

Constructor Summary

Constructors

Constructor and Description
JCacheMetrics(javax.cache.Cache<?,?> cache, java.lang.Iterable<Tag> tags)

Method Summary

Modifier and Type	Method and Description
protected void	bindImplementationSpecificMetrics(MeterRegistry registry) Bind detailed metrics that are particular to the cache implementation, e.g.
protected java.lang.Long	evictionCount()
protected long	hitCount()
protected long	missCount()
static <K,V,C extends javax.cache.Cache<K,V>> C	monitor(MeterRegistry registry, C cache, java.lang.Iterable<Tag> tags) Record metrics on a JCache cache.
static <K,V,C extends javax.cache.Cache<K,V>> C	monitor(MeterRegistry registry, C cache, java.lang.String... tags) Record metrics on a JCache cache.
protected long	putCount() The put mechanism is unimportant - this count applies to entries added to the cache according to a pre-defined load function such as exists in Guava/Caffeine caches as well as manual puts.
protected java.lang.Long	size() MOST cache implementations provide a means of retrieving the number of entries.

Methods inherited from class io.micrometer.core.instrument.binder.cache.CacheMeterBinder

bindTo, getTagsWithCacheName

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JCacheMetrics

public JCacheMetrics(javax.cache.Cache<?,?> cache,
                     java.lang.Iterable<Tag> tags)

Method Detail

monitor

public static <K,V,C extends javax.cache.Cache<K,V>> C monitor(MeterRegistry registry,
                                                               C cache,
                                                               java.lang.String... tags)

Record metrics on a JCache cache.

Type Parameters:

C - The cache type.

K - The cache key type.

V - The cache value type.

Parameters:

registry - The registry to bind metrics to.

cache - The cache to instrument.

tags - Tags to apply to all recorded metrics. Must be an even number of arguments representing key/value pairs of tags.

Returns:

The instrumented cache, unchanged. The original cache is not wrapped or proxied in any way.

See Also:

CacheStats

monitor

public static <K,V,C extends javax.cache.Cache<K,V>> C monitor(MeterRegistry registry,
                                                               C cache,
                                                               java.lang.Iterable<Tag> tags)

Record metrics on a JCache cache.

Type Parameters:

C - The cache type.

K - The cache key type.

V - The cache value type.

Parameters:

registry - The registry to bind metrics to.

cache - The cache to instrument.

tags - Tags to apply to all recorded metrics.

Returns:

The instrumented cache, unchanged. The original cache is not wrapped or proxied in any way.

See Also:

CacheStats

size

protected java.lang.Long size()

Description copied from class: CacheMeterBinder

MOST cache implementations provide a means of retrieving the number of entries. Even if

Specified by:

size in class CacheMeterBinder

Returns:

Total number of cache entries. This value may go up or down with puts, removes, and evictions. Returns null if the cache implementation does not provide a way to track cache size.

hitCount

protected long hitCount()

Specified by:

hitCount in class CacheMeterBinder

Returns:

Get requests that resulted in a "hit" against an existing cache entry. Monotonically increasing hit count.

missCount

protected long missCount()

Specified by:

missCount in class CacheMeterBinder

Returns:

Get requests that resulted in a "miss", or didn't match an existing cache entry. Monotonically increasing count.

evictionCount

protected java.lang.Long evictionCount()

Specified by:

evictionCount in class CacheMeterBinder

Returns:

Total number of entries that have been evicted from the cache. Monotonically increasing eviction count. Returns null if the cache implementation does not support eviction, or does not provide a way to track the eviction count.

putCount

protected long putCount()

Description copied from class: CacheMeterBinder

The put mechanism is unimportant - this count applies to entries added to the cache according to a pre-defined load function such as exists in Guava/Caffeine caches as well as manual puts.

Specified by:

putCount in class CacheMeterBinder

Returns:

Total number of entries added to the cache. Monotonically increasing count.

bindImplementationSpecificMetrics

protected void bindImplementationSpecificMetrics(MeterRegistry registry)

Description copied from class: CacheMeterBinder

Bind detailed metrics that are particular to the cache implementation, e.g. load duration for Caffeine caches, heap and disk size for EhCache caches. These metrics are above and beyond the basic set of metrics that is common to all caches.

Specified by:

bindImplementationSpecificMetrics in class CacheMeterBinder

Parameters:

registry - The registry to bind metrics to.