/**
* 根据namespace查找需要的信息，避免每次反射的耗时操作
*
* @param conf
* @param statementId
* @return
* @throws ClassNotFoundException
*/
private MapperMeta getMapperMeta(Configuration conf, final String statementId)
throws ClassNotFoundException {
MapperMeta meta = CACHED.get(statementId);
if (meta == null) {
int pos = statementId.lastIndexOf('.');
String namespace = statementId.substring(0, pos); // mapper类名
String methodName = statementId.substring(pos + 1);
Class<?> mapperClass;
mapperClass = Class.forName(namespace);
synchronized (this) {
meta = CACHED.get(statementId);
if (meta == null) {
meta = buildMapperMeta(conf, namespace, methodName, mapperClass);
CACHED.put(statementId, meta);
}
}
}
return meta;
}
private Class<?> getEntityClass(String namespace) {
Class<?> entityClazz = ENTITY_CACHE.get(namespace);
if (entityClazz == null) {
try {
Type[] genTypes = Class.forName(namespace).getGenericInterfaces();
if (genTypes.length == 0) {
return null;
}
Type type = genTypes[0];
if (!(type instanceof ParameterizedType)) {
return null;
}
Type[] actualTypeArguments = ((ParameterizedType) type).getActualTypeArguments();
logger.info("namespace:{}, EntityClass: {}", namespace, actualTypeArguments);
entityClazz = (Class<?>) actualTypeArguments[0];
} catch (ClassNotFoundException e) {
logger.error("getEntityClass({})", namespace, e);
entityClazz = Object.class;
}
ENTITY_CACHE.put(namespace, entityClazz);
}
return entityClazz;
}