1. Mapper 代理层执行
Mapper 代理上执行方法调用时,调用被委派给 MapperProxy 来处理。
public class MapperProxyimplements InvocationHandler, Serializable { private final SqlSession sqlSession; private final Class mapperInterface; private final Map methodCache; public MapperProxy(SqlSession sqlSession, Class mapperInterface, Map methodCache) { this.sqlSession = sqlSession; this.mapperInterface = mapperInterface; this.methodCache = methodCache; } public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { if (Object.class.equals(method.getDeclaringClass())) { try { return method.invoke(this, args); } catch (Throwable t) { throw ExceptionUtil.unwrapThrowable(t); } } // 接口里声明的方法,转换为 MapperMethod 来调用 final MapperMethod mapperMethod = cachedMapperMethod(method); // 与 Spring 集成时此处的 sqlSession 仍然 SqlSessionTemplate return mapperMethod.execute(sqlSession, args); } private MapperMethod cachedMapperMethod(Method method) { MapperMethod mapperMethod = methodCache.get(method); if (mapperMethod == null) { mapperMethod = new MapperMethod(mapperInterface, method, sqlSession.getConfiguration()); methodCache.put(method, mapperMethod); } return mapperMethod; } }
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