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144 changes: 144 additions & 0 deletions
144
src/main/java/com/nike/cerberus/cache/MetricReportingCache.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,144 @@ | ||
| /* | ||
| * Copyright (c) 2019 Nike, 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 | ||
| * | ||
| * http://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. | ||
| * | ||
| */ | ||
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| package com.nike.cerberus.cache; | ||
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| import com.codahale.metrics.Counter; | ||
| import com.github.benmanes.caffeine.cache.Cache; | ||
| import com.github.benmanes.caffeine.cache.Policy; | ||
| import com.github.benmanes.caffeine.cache.stats.CacheStats; | ||
| import com.nike.cerberus.service.MetricsService; | ||
| import org.checkerframework.checker.nullness.qual.NonNull; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import java.util.Map; | ||
| import java.util.concurrent.ConcurrentMap; | ||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.function.Function; | ||
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| import static com.github.benmanes.caffeine.cache.Caffeine.newBuilder; | ||
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| /** | ||
| * A simple Caffeine backed cache that auto expires items after a certain time period, | ||
| * to help us against bursty traffic that does repeat reads. | ||
| */ | ||
| public class MetricReportingCache<K, V> implements Cache<K, V> { | ||
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| private final Logger log = LoggerFactory.getLogger(getClass()); | ||
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| private com.github.benmanes.caffeine.cache.Cache<K, V> delegate; | ||
| private final Counter hitCounter; | ||
| private final Counter missCounter; | ||
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| public MetricReportingCache(String namespace,int expireTimeInSeconds, MetricsService metricsService, | ||
| Map<String, String> dimensions) { | ||
| log.info("Cerberus cache with namespace: {} has been initialized with ttl: {}", namespace, expireTimeInSeconds); | ||
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| delegate = newBuilder() | ||
| .expireAfterWrite(expireTimeInSeconds, TimeUnit.SECONDS) | ||
| .build(); | ||
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| // Create Metrics for this cache. | ||
| hitCounter = metricsService.getOrCreateCounter(String.format("cms.cache.%s.hit", namespace), dimensions); | ||
| missCounter = metricsService.getOrCreateCounter(String.format("cms.cache.%s.miss", namespace), dimensions); | ||
| metricsService.getOrCreateLongCallbackGauge(String.format("cms.cache.%s.size", namespace), | ||
| () -> delegate.estimatedSize(), dimensions); | ||
| metricsService.getOrCreateLongCallbackGauge(String.format("cms.cache.%s.stats.totalHitCount", namespace), | ||
| () -> delegate.stats().hitCount(), dimensions); | ||
| metricsService.getOrCreateLongCallbackGauge(String.format("cms.cache.%s.stats.totalMissCount", namespace), | ||
| () -> delegate.stats().missCount(), dimensions); | ||
| } | ||
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| @Override | ||
| public V getIfPresent(Object key) { | ||
| V value = delegate.getIfPresent(key); | ||
| if (value == null) { | ||
| missCounter.inc(); | ||
| } else { | ||
| hitCounter.inc(); | ||
| } | ||
| return value; | ||
| } | ||
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| @Override | ||
| public V get(K key, Function<? super K, ? extends V> mappingFunction) { | ||
| V value = delegate.getIfPresent(key); | ||
| if (value == null) { | ||
| missCounter.inc(); | ||
| return delegate.get(key, mappingFunction); | ||
| } else { | ||
| hitCounter.inc(); | ||
| return value; | ||
| } | ||
| } | ||
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| @Override | ||
| public void put(K key, V value) { | ||
| delegate.put(key, value); | ||
| } | ||
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| @Override | ||
| public void putAll(Map map) { | ||
| delegate.putAll(map); | ||
| } | ||
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| @Override | ||
| public void invalidate(Object key) { | ||
| delegate.invalidate(key); | ||
| } | ||
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| @Override | ||
| public void invalidateAll() { | ||
| delegate.invalidateAll(); | ||
| } | ||
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| @Override | ||
| public long estimatedSize() { | ||
| return delegate.estimatedSize(); | ||
| } | ||
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| @Override | ||
| public CacheStats stats() { | ||
| return delegate.stats(); | ||
| } | ||
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| @Override | ||
| public ConcurrentMap asMap() { | ||
| return delegate.asMap(); | ||
| } | ||
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| @Override | ||
| public void cleanUp() { | ||
| delegate.cleanUp(); | ||
| } | ||
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| @Override | ||
| public Policy policy() { | ||
| return delegate.policy(); | ||
| } | ||
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| @Override | ||
| public void invalidateAll(Iterable keys) { | ||
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| } | ||
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| @Override | ||
| public @NonNull Map getAllPresent(Iterable keys) { | ||
| return delegate.getAllPresent(keys); | ||
| } | ||
| } |
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61 changes: 61 additions & 0 deletions
61
src/main/java/com/nike/cerberus/metrics/CallbackLongGauge.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| /* | ||
| * Copyright (c) 2019 Nike, 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 | ||
| * | ||
| * http://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. | ||
| * | ||
| */ | ||
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| package com.nike.cerberus.metrics; | ||
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| import com.codahale.metrics.Gauge; | ||
| import com.codahale.metrics.Metric; | ||
| import com.signalfx.codahale.metrics.MetricBuilder; | ||
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| import java.util.function.Supplier; | ||
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| public class CallbackLongGauge implements Metric, Gauge<Long> { | ||
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| private final Supplier<Long> supplier; | ||
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| public CallbackLongGauge(Supplier<Long> supplier) { | ||
| this.supplier = supplier; | ||
| } | ||
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| @Override | ||
| public Long getValue() { | ||
| return supplier.get(); | ||
| } | ||
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| public static class Builder implements MetricBuilder<CallbackLongGauge> { | ||
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| private final Supplier<Long> supplier; | ||
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| public static Builder getInstance(Supplier<Long> supplier) { | ||
| return new Builder(supplier); | ||
| } | ||
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| private Builder(Supplier<Long> supplier) { | ||
| this.supplier = supplier; | ||
| } | ||
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| @Override | ||
| public CallbackLongGauge newMetric() { | ||
| return new CallbackLongGauge(supplier); | ||
| } | ||
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| @Override | ||
| public boolean isInstance(Metric metric) { | ||
| return metric instanceof CallbackLongGauge; | ||
| } | ||
| } | ||
| } |
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