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This is the ehcache core module. Pair it with other modules for added functionality.
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/**
 *  Copyright 2003-2010 Terracotta, 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 net.sf.ehcache.statistics;

/**
 * Interface for listeners to any change in usage statistics of an
 * Ehcache.
 *
 * 
 * Implementations of this interface should implement the {@link Object#equals(Object)} and the {@link Object#hashCode()} as registering and
 * removing listeners depends on these
 * 
 *
 * @author Abhishek Sanoujam
 * @since 1.7
 */
public interface CacheUsageListener {

    /**
     * Called when statistics is enabled/disabled
     *
     * @param enableStatistics
     */
    void notifyStatisticsEnabledChanged(boolean enableStatistics);

    /**
     * Called when statistics is cleared
     */
    void notifyStatisticsCleared();

    /**
     * Called on a cache hit in the MemoryStore
     */
    void notifyCacheHitInMemory();

    /**
     * Called on a cache hit in the off-heap store
     */
    void notifyCacheHitOffHeap();

    /**
     * Called on a cache hit in the DiskStore
     */
    void notifyCacheHitOnDisk();

    /**
     * Called when an element is inserted in the cache
     */
    void notifyCacheElementPut();

    /**
     * Called when an element is updated in the cache, i.e. a put for an already
     * existing key
     */
    void notifyCacheElementUpdated();

    /**
     * Called when an element is not found in the cache
     */
    void notifyCacheMissedWithNotFound();

    /**
     * Called on a cache miss in the MemoryStore
     */
    void notifyCacheMissInMemory();

    /**
     * Called on a cache miss in the off-heap store
     */
    void notifyCacheMissOffHeap();

    /**
     * Called on a cache miss in the DiskStore
     */
    void notifyCacheMissOnDisk();

    /**
     * Called when an element is found in the cache but already expired
     */
    void notifyCacheMissedWithExpired();

    /**
     * Notified with time taken for a get operation in the cache
     *
     * @param millis
     */
    void notifyTimeTakenForGet(final long millis);

    /**
     * Called when an element is expired in the cache
     */
    void notifyCacheElementEvicted();

    /**
     * Called when an element in the cache expires
     */
    void notifyCacheElementExpired();

    /**
     * Called when an element is removed from the cache
     */
    void notifyCacheElementRemoved();

    /**
     * Called when Cache.removeAll() is called
     */
    void notifyRemoveAll();

    /**
     * Notified when the statistics accuracy is changed.
     *
     * @param statisticsAccuracy
     *            one of Statistics#STATISTICS_ACCURACY_BEST_EFFORT,
     *            Statistics#STATISTICS_ACCURACY_GUARANTEED,
     *            Statistics#STATISTICS_ACCURACY_NONE
     */
    void notifyStatisticsAccuracyChanged(int statisticsAccuracy);

    /**
     * Called to dispose off the listener
     */
    void dispose();

    /**
     * Called when a search finishes execution
     *
     * @param executeTime elapsed time in millis
     */
    void notifyCacheSearch(long executeTime);

    /**
     * Called when the Cache's XAResource has been asked to commit
     */
    void notifyXaCommit();

    /**
     * Called when the Cache's XAResource has been asked to rollback
     */
    void notifyXaRollback();

}