我在其中的一个开源项目上看到了如下配置，是什么意思？

dao : {
		type : "org.nutz.dao.impl.NutDaoExt",
		args : [ {
			refer : "dataSource"
		} ],
		fields : {
			executor : {
				refer : "cacheExecutor"
			}
		}
	},
	cacheExecutor : {
		type : "org.nutz.plugins.cache.dao.CachedNutDaoExecutor",
		fields : {
			cacheProvider : {
				refer : "cacheProvider"
			},
			cachedTableNames : [ "article", "article_category", "acquisition",
					"crawler_rule", "system_permission", "permission_category",
					"system_role", "system_setting" ],
			enableWhenTrans : false, // 事务作用域内不启用缓存,默认也是false
			db : "MYSQL"
		}
	},
	cacheProvider : {
		type : "org.nutz.plugins.cache.dao.impl.provider.MemoryDaoCacheProvider",
		fields : {
			cacheSize : 10000000
		},
		events : {
			create : "init"
		}
	}