| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| * |
| */ |
| |
| package org.apache.jackrabbit.oak.cache; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static java.lang.String.format; |
| import static org.apache.jackrabbit.oak.commons.IOUtils.humanReadableByteCount; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| import com.google.common.base.Objects; |
| import com.google.common.cache.CacheStats; |
| import org.apache.jackrabbit.oak.api.jmx.CacheStatsMBean; |
| import org.apache.jackrabbit.oak.commons.jmx.AnnotatedStandardMBean; |
| import org.jetbrains.annotations.NotNull; |
| |
| /** |
| * Abstract base class for providing cache statistic via the {@link CacheStatsMBean}. |
| */ |
| public abstract class AbstractCacheStats extends AnnotatedStandardMBean implements CacheStatsMBean { |
| |
| @NotNull |
| private final String name; |
| |
| private CacheStats lastSnapshot = |
| new CacheStats(0, 0, 0, 0, 0, 0); |
| |
| /** |
| * Create a new {@code CacheStatsMBean} for a cache with the given {@code name}. |
| * @param name |
| */ |
| protected AbstractCacheStats(@NotNull String name) { |
| super(CacheStatsMBean.class); |
| this.name = checkNotNull(name); |
| } |
| |
| /** |
| * Call back invoked to retrieve the most recent {@code CacheStats} instance of the |
| * underlying cache. |
| */ |
| protected abstract CacheStats getCurrentStats(); |
| |
| private CacheStats stats() { |
| return getCurrentStats().minus(lastSnapshot); |
| } |
| |
| @Override |
| public synchronized void resetStats() { |
| // Cache stats cannot be rest at Guava level. Instead we |
| // take a snapshot and then subtract it from future stats calls |
| lastSnapshot = getCurrentStats(); |
| } |
| |
| @NotNull |
| @Override |
| public String getName() { |
| return name; |
| } |
| |
| @Override |
| public long getRequestCount() { |
| return stats().requestCount(); |
| } |
| |
| @Override |
| public long getHitCount() { |
| return stats().hitCount(); |
| } |
| |
| @Override |
| public double getHitRate() { |
| return stats().hitRate(); |
| } |
| |
| @Override |
| public long getMissCount() { |
| return stats().missCount(); |
| } |
| |
| @Override |
| public double getMissRate() { |
| return stats().missRate(); |
| } |
| |
| @Override |
| public long getLoadCount() { |
| return stats().loadCount(); |
| } |
| |
| @Override |
| public long getLoadSuccessCount() { |
| return stats().loadSuccessCount(); |
| } |
| |
| @Override |
| public long getLoadExceptionCount() { |
| return stats().loadExceptionCount(); |
| } |
| |
| @Override |
| public double getLoadExceptionRate() { |
| return stats().loadExceptionRate(); |
| } |
| |
| @Override |
| public long getTotalLoadTime() { |
| return stats().totalLoadTime(); |
| } |
| |
| @Override |
| public double getAverageLoadPenalty() { |
| return stats().averageLoadPenalty(); |
| } |
| |
| @Override |
| public long getEvictionCount() { |
| return stats().evictionCount(); |
| } |
| |
| @Override |
| public String cacheInfoAsString() { |
| return Objects.toStringHelper("CacheStats") |
| .add("hitCount", getHitCount()) |
| .add("hitRate", format("%1.2f", getHitRate())) |
| .add("missCount", getMissCount()) |
| .add("missRate", format("%1.2f", getMissRate())) |
| .add("requestCount", getRequestCount()) |
| .add("loadCount", getLoadCount()) |
| .add("loadSuccessCount", getLoadSuccessCount()) |
| .add("loadExceptionCount", getLoadExceptionCount()) |
| .add("totalLoadTime", timeInWords(getTotalLoadTime())) |
| .add("averageLoadPenalty", format("%1.2f ns", getAverageLoadPenalty())) |
| .add("evictionCount", getEvictionCount()) |
| .add("elementCount", getElementCount()) |
| .add("totalWeight", humanReadableByteCount(estimateCurrentWeight())) |
| .add("maxWeight", humanReadableByteCount(getMaxTotalWeight())) |
| .toString(); |
| } |
| |
| public static String timeInWords(long nanos) { |
| long millis = TimeUnit.NANOSECONDS.toMillis(nanos); |
| return String.format("%d min, %d sec", |
| TimeUnit.MILLISECONDS.toMinutes(millis), |
| TimeUnit.MILLISECONDS.toSeconds(millis) - |
| TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)) |
| ); |
| } |
| |
| } |