JMXInstrumentedCacheMBean.java

package org.apache.cassandra.cache;
/*
 * 
 * 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
 * 
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public interface JMXInstrumentedCacheMBean
{
    public int getCapacity();
    public void setCapacity(int capacity);
    public int getSize();

    /** total request count since cache creation */
    public long getRequests();

    /** total cache hit count since cache creation */
    public long getHits();

    /**
     * hits / requests since the last time getHitRate was called.  serious telemetry apps should not use this,
     * and should instead track the deltas from getHits / getRequests themselves, since those will not be
     * affected by multiple users calling it.  Provided for convenience only.
     */
    public double getRecentHitRate();
}