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Core module of Micrometer containing instrumentation API and implementation
/*
* Copyright 2017 VMware, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.micrometer.core.instrument.binder.cache;
import io.micrometer.core.instrument.*;
import io.micrometer.core.instrument.binder.BaseUnits;
import io.micrometer.core.lang.NonNullApi;
import io.micrometer.core.lang.NonNullFields;
import io.micrometer.core.lang.Nullable;
import java.util.concurrent.TimeUnit;
/**
* Collect metrics on Hazelcast caches, including detailed metrics on storage space, near
* cache usage, and timings.
*
* @author Jon Schneider
*/
@NonNullApi
@NonNullFields
public class HazelcastCacheMetrics extends CacheMeterBinder {
private final HazelcastIMapAdapter cache;
/**
* Record metrics on a Hazelcast cache.
* @param registry registry to bind metrics to
* @param cache Hazelcast IMap cache to instrument
* @param tags Tags to apply to all recorded metrics. Must be an even number of
* arguments representing key/value pairs of tags.
* @return The instrumented cache, unchanged. The original cache is not wrapped or
* proxied in any way.
*/
public static Object monitor(MeterRegistry registry, Object cache, String... tags) {
return monitor(registry, cache, Tags.of(tags));
}
/**
* Record metrics on a Hazelcast cache.
* @param registry registry to bind metrics to
* @param cache Hazelcast IMap cache to instrument
* @param tags Tags to apply to all recorded metrics.
* @return The instrumented cache, unchanged. The original cache is not wrapped or
* proxied in any way.
*/
public static Object monitor(MeterRegistry registry, Object cache, Iterable tags) {
new HazelcastCacheMetrics(cache, tags).bindTo(registry);
return cache;
}
/**
* Binder for Hazelcast cache metrics.
* @param cache Hazelcast IMap cache to instrument
* @param tags Tags to apply to all recorded metrics.
*/
public HazelcastCacheMetrics(Object cache, Iterable tags) {
super(cache, HazelcastIMapAdapter.nameOf(cache), tags);
this.cache = new HazelcastIMapAdapter(cache);
}
@Override
protected Long size() {
return cache.getLocalMapStats().getOwnedEntryCount();
}
/**
* @return The number of hits against cache entries held in this local partition. Not
* all gets had to result from a get operation against {@link #cache}. If a get
* operation elsewhere in the cluster caused a lookup against an entry held in this
* partition, the hit will be recorded against map stats in this partition and not in
* the map stats of the calling {@code IMap}.
*/
@Override
protected long hitCount() {
return cache.getLocalMapStats().getHits();
}
/**
* @return There is no way to calculate miss count in Hazelcast. See issue #586.
*/
@Override
protected Long missCount() {
return null;
}
@Nullable
@Override
protected Long evictionCount() {
return null;
}
@Override
protected long putCount() {
return cache.getLocalMapStats().getPutOperationCount();
}
@Override
protected void bindImplementationSpecificMetrics(MeterRegistry registry) {
Gauge.builder("cache.entries", cache, cache -> cache.getLocalMapStats().getBackupEntryCount())
.tags(getTagsWithCacheName()).tag("ownership", "backup")
.description("The number of backup entries held by this member").register(registry);
Gauge.builder("cache.entries", cache, cache -> cache.getLocalMapStats().getOwnedEntryCount())
.tags(getTagsWithCacheName()).tag("ownership", "owned")
.description("The number of owned entries held by this member").register(registry);
Gauge.builder("cache.entry.memory", cache, cache -> cache.getLocalMapStats().getBackupEntryMemoryCost())
.tags(getTagsWithCacheName()).tag("ownership", "backup")
.description("Memory cost of backup entries held by this member").baseUnit(BaseUnits.BYTES)
.register(registry);
Gauge.builder("cache.entry.memory", cache, cache -> cache.getLocalMapStats().getOwnedEntryMemoryCost())
.tags(getTagsWithCacheName()).tag("ownership", "owned")
.description("Memory cost of owned entries held by this member").baseUnit(BaseUnits.BYTES)
.register(registry);
FunctionCounter.builder("cache.partition.gets", cache, cache -> cache.getLocalMapStats().getGetOperationCount())
.tags(getTagsWithCacheName())
.description("The total number of get operations executed against this partition").register(registry);
timings(registry);
nearCacheMetrics(registry);
}
private void nearCacheMetrics(MeterRegistry registry) {
if (cache.getLocalMapStats().getNearCacheStats() != null) {
Gauge.builder("cache.near.requests", cache, cache -> cache.getLocalMapStats().getNearCacheStats().getHits())
.tags(getTagsWithCacheName()).tag("result", "hit")
.description("The number of hits (reads) of near cache entries owned by this member")
.register(registry);
Gauge.builder("cache.near.requests", cache,
cache -> cache.getLocalMapStats().getNearCacheStats().getMisses()).tags(getTagsWithCacheName())
.tag("result", "miss")
.description("The number of hits (reads) of near cache entries owned by this member")
.register(registry);
Gauge.builder("cache.near.evictions", cache,
cache -> cache.getLocalMapStats().getNearCacheStats().getEvictions()).tags(getTagsWithCacheName())
.description("The number of evictions of near cache entries owned by this member")
.register(registry);
Gauge.builder("cache.near.persistences", cache,
cache -> cache.getLocalMapStats().getNearCacheStats().getPersistenceCount())
.tags(getTagsWithCacheName())
.description("The number of Near Cache key persistences (when the pre-load feature is enabled)")
.register(registry);
}
}
private void timings(MeterRegistry registry) {
FunctionTimer
.builder("cache.gets.latency", cache, cache -> cache.getLocalMapStats().getGetOperationCount(),
cache -> cache.getLocalMapStats().getTotalGetLatency(), TimeUnit.MILLISECONDS)
.tags(getTagsWithCacheName()).description("Cache gets").register(registry);
FunctionTimer
.builder("cache.puts.latency", cache, cache -> cache.getLocalMapStats().getPutOperationCount(),
cache -> cache.getLocalMapStats().getTotalPutLatency(), TimeUnit.MILLISECONDS)
.tags(getTagsWithCacheName()).description("Cache puts").register(registry);
FunctionTimer
.builder("cache.removals.latency", cache, cache -> cache.getLocalMapStats().getRemoveOperationCount(),
cache -> cache.getLocalMapStats().getTotalRemoveLatency(), TimeUnit.MILLISECONDS)
.tags(getTagsWithCacheName()).description("Cache removals").register(registry);
}
}