Mybatis拦截器机制以及Mybatis物理分页操作指南

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以下按照代码执行顺序从.xml配置文件开始，浅析Mybatis拦截器机制在整个运行过程中的主要环节。

1. xml配置文件

1.解析xml中的plugin节点，将interceptor添加到Configuration中
XMLConfigBuilder.pluginElement(XNode parent)

从xml配置文件中生成的Configuration对象中包含了plugin在内的所有属性，

package org.apache.ibatis.binding;import java.io.Serializable;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.util.Map;import org.apache.ibatis.reflection.ExceptionUtil;import org.apache.ibatis.session.SqlSession;/** * @author Clinton Begin * @author Eduardo Macarron */public class MapperProxy<T> implements InvocationHandler, Serializable {  private static final long serialVersionUID = -6424540398559729838L;  private final SqlSession sqlSession;  private final Class<T> mapperInterface;  private final Map<Method, MapperMethod> methodCache;  public MapperProxy(SqlSession sqlSession, Class<T> mapperInterface, Map<Method, MapperMethod> methodCache) {    this.sqlSession = sqlSession;    this.mapperInterface = mapperInterface;    this.methodCache = methodCache;  }  @Override  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);      }    }    final MapperMethod mapperMethod = cachedMapperMethod(method);    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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