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此文只对磁盘缓存方式进行展述

hibernate执行sql，将数据转化为映射实体类后会进行数据缓存，其中调用AbstractRowReader#performTwoPhaseLoad方法时，会循环数据集，调用TwoPhaseLoad.initializeEntity();该方法会调用ehcache的put方法进行数据缓存。

ehcache在put数据实例（数据实例已转化为Element实例对象)，该对象到磁盘时（此时内存缓存已满，按照ehcache.xml中设定的策略，超过部分存储在磁盘），会判断当前disk store spool is full，如果已满，需进行50ms的sleep,降低生产线程放入的速度。

Cache.class

/**
     * Put an element in the cache.
     * <p/>
     * Resets the access statistics on the element, which would be the case if it has previously been
     * gotten from a cache, and is now being put back.
     * <p/>
     * Also notifies the CacheEventListener that:
     * <ul>
     * <li>the element was put, but only if the Element was actually put.
     * <li>if the element exists in the cache, that an update has occurred, even if the element would be expired
     * if it wa