if (enableIndexLRU) {
final long maxMemory = Runtime.getRuntime().maxMemory();
// Ĭ��ʹ������ڴ��1/40���洢������Ŀǰֻ�ǹ���ֵ����Ҫ����
final int capacity = (int) (maxMemory / 40 / 60);
this.indices =
new LRUIndexMap(capacity, this.getPath() + File.separator + name + "_indexCache",
enableIndexLRU);
}
else {
this.indices = new ConcurrentIndexMap();
}