mybatis源码-加载自定义日志实现

  作者:记性不好的阁主

加载自定义日志


/**
* Copyright 2009-2021 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.ibatis.builder.xml;


import org.apache.ibatis.builder.BaseBuilder;
import org.apache.ibatis.builder.BuilderException;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.io.VFS;
import org.apache.ibatis.logging.Log;
import org.apache.ibatis.parsing.XNode;
import org.apache.ibatis.parsing.XPathParser;
import org.apache.ibatis.reflection.DefaultReflectorFactory;
import org.apache.ibatis.reflection.MetaClass;
import org.apache.ibatis.reflection.ReflectorFactory;
import org.apache.ibatis.session.Configuration;

import java.io.InputStream;
import java.util.Properties;

/**
* @author Clinton Begin
* @author Kazuki Shimizu
*/
public class XMLConfigBuilder extends BaseBuilder {

private boolean parsed;
private final XPathParser parser;
private String environment;
private final ReflectorFactory localReflectorFactory = new DefaultReflectorFactory();


public XMLConfigBuilder(InputStream inputStream, String environment, Properties props) {
this(new XPathParser(inputStream, true, props, new XMLMapperEntityResolver()), environment, props);
}

private XMLConfigBuilder(XPathParser parser, String environment, Properties props) {
// 实例化配置类
super(new Configuration());
// 资源说明
ErrorContext.instance().resource("SQL Mapper Configuration");
// 根据.properties配置文件进行配置
this.configuration.setVariables(props);
// 初始化parsedenvironmentparser
this.parsed = false;
this.environment = environment;
this.parser = parser;
}

// 解析配置文件
public Configuration parse() {
if (parsed) {
throw new BuilderException("Each XMLConfigBuilder can only be used once.");
}
parsed = true;
parseConfiguration(parser.evalNode("/configuration"));
return configuration;
}

private void parseConfiguration(XNode root) {
try {
// 解析mybatis-config.xml文件中的<properties>元素
propertiesElement(root.evalNode("properties"));
// 解析mybatis-config.xml文件中的<settings>元素
Properties settings = settingsAsProperties(root.evalNode("settings"));
// 加载自定义虚拟文件系统 <settings><vfsImpl></vfsImpl></settings>
loadCustomVfs(settings);
// 加载自定义日志实现 <settings><logImpl></logImpl></settings>
loadCustomLogImpl(settings);

} catch (Exception e) {
throw new BuilderException("Error parsing SQL Mapper Configuration. Cause: " + e, e);
}
}
......
private void loadCustomLogImpl(Properties props) {
Class<? extends Log> logImpl = resolveClass(props.getProperty("logImpl"));
configuration.setLogImpl(logImpl);
}

}


日志接口:


/**
* Copyright 2009-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.ibatis.logging;

/**
* @author Clinton Begin
*/
public interface Log {

boolean isDebugEnabled();

boolean isTraceEnabled();

void error(String s, Throwable e);

void error(String s);

void debug(String s);

void trace(String s);

void warn(String s);

}


实现类:



日志实现类关系图:






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