managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerFactoryMBeanImpl.java

/**
 * Copyright 2016 Yahoo 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.
 */
package org.apache.bookkeeper.mledger.impl;

import java.util.concurrent.TimeUnit;

import org.apache.bookkeeper.mledger.ManagedLedgerFactoryMXBean;
import org.apache.bookkeeper.mledger.util.Rate;

public class ManagedLedgerFactoryMBeanImpl implements ManagedLedgerFactoryMXBean {

    private final ManagedLedgerFactoryImpl factory;

    final Rate cacheHits = new Rate();
    final Rate cacheMisses = new Rate();
    final Rate cacheEvictions = new Rate();

    public ManagedLedgerFactoryMBeanImpl(ManagedLedgerFactoryImpl factory) throws Exception {
        this.factory = factory;
    }

    public void refreshStats(long period, TimeUnit unit) {
        double seconds = unit.toMillis(period) / 1000.0;

        cacheHits.calculateRate(seconds);
        cacheMisses.calculateRate(seconds);
        cacheEvictions.calculateRate(seconds);
    }

    public void recordCacheHit(long size) {
        cacheHits.recordEvent(size);
    }

    public void recordCacheHits(int count, long totalSize) {
        cacheHits.recordMultipleEvents(count, totalSize);
    }

    public void recordCacheMiss(int count, long totalSize) {
        cacheMisses.recordMultipleEvents(count, totalSize);
    }

    public void recordCacheEviction() {
        cacheEvictions.recordEvent();
    }

    // //

    @Override
    public int getNumberOfManagedLedgers() {
        return factory.ledgers.size();
    }

    @Override
    public long getCacheUsedSize() {
        return factory.getEntryCacheManager().getSize();
    }

    @Override
    public long getCacheMaxSize() {
        return factory.getEntryCacheManager().getMaxSize();
    }

    @Override
    public double getCacheHitsRate() {
        return cacheHits.getRate();
    }

    @Override
    public double getCacheMissesRate() {
        return cacheMisses.getRate();
    }

    @Override
    public double getCacheHitsThroughput() {
        return cacheHits.getValueRate();
    }

    @Override
    public double getCacheMissesThroughput() {
        return cacheMisses.getValueRate();
    }

    @Override
    public long getNumberOfCacheEvictions() {
        return cacheEvictions.getCount();
    }

}