com.turbospaces.core.CacheStatisticsCounter.java Source code

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Here is the source code for com.turbospaces.core.CacheStatisticsCounter.java

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/**
 * Copyright (C) 2011-2012 Andrey Borisov <aandrey.borisov@gmail.com>
 *
 * 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.
 */
package com.turbospaces.core;

import javax.annotation.concurrent.Immutable;

import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import com.google.common.cache.AbstractCache.SimpleStatsCounter;
import com.google.common.cache.CacheStats;
import com.lmax.disruptor.Sequence;

/**
 * cache statistic wrapper. contains hits/puts/takes count information.
 * 
 * @since 0.1
 */
@SuppressWarnings("javadoc")
public final class CacheStatisticsCounter extends SimpleStatsCounter {
    private final Sequence putsCount = new Sequence(0);
    private final Sequence takesCount = new Sequence(0);
    private final Sequence exclusiveReadsCount = new Sequence(0);

    public void recordPuts(final int count) {
        putsCount.addAndGet(count);
    }

    public void recordTakes(final int count) {
        takesCount.addAndGet(count);
    }

    public void recordExclusiveReads(final int count) {
        exclusiveReadsCount.addAndGet(count);
    }

    @Override
    public String toString() {
        CacheStats snapshot = super.snapshot();

        return Objects.toStringHelper(this).add("putsCount", putsCount.get()).add("takesCount", takesCount.get())
                .add("exclusiveReadsCount", exclusiveReadsCount.get()).add("hitsCount", snapshot.hitCount())
                .add("missCount", snapshot.missCount()).add("loadSuccessCount", snapshot.loadSuccessCount())
                .add("loadExceptionCount", snapshot.loadExceptionCount())
                .add("loadSuccessRate", snapshot.loadExceptionRate())
                .add("loadExceptionRate", snapshot.loadExceptionRate()).toString();
    }

    public CompleteCacheStats snapshotCompleteCacheStats() {
        return new CompleteCacheStats(putsCount.get(), takesCount.get(), exclusiveReadsCount.get(), snapshot());
    }

    @Immutable
    public static class CompleteCacheStats {
        private final long putsCount;
        private final long takesCount;
        private final long exclusiveReadsCount;
        private final CacheStats readStats;

        private CompleteCacheStats(final long putsCount, final long takesCount, final long exclusiveReadsCount,
                final CacheStats readStats) {
            super();

            Preconditions.checkArgument(putsCount >= 0);
            Preconditions.checkArgument(takesCount >= 0);
            Preconditions.checkArgument(exclusiveReadsCount >= 0);

            this.putsCount = putsCount;
            this.takesCount = takesCount;
            this.exclusiveReadsCount = exclusiveReadsCount;
            this.readStats = Preconditions.checkNotNull(readStats);
        }

        public long putsCount() {
            return putsCount;
        }

        public long takesCount() {
            return takesCount;
        }

        public long exclusiveReadsCount() {
            return exclusiveReadsCount;
        }

        public CacheStats readStats() {
            return readStats;
        }

        public CompleteCacheStats minus(final CompleteCacheStats other) {
            return new CompleteCacheStats(Math.max(0, putsCount - other.putsCount), //
                    Math.max(0, takesCount - other.takesCount), //
                    Math.max(0, exclusiveReadsCount - other.exclusiveReadsCount), //
                    readStats.minus(other.readStats));
        }
    }
}