关于MyBatis中Mapper XML热加载优化
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2024-01-01 15:44:28
前几天在琢磨mybatis xml热加载的问题，原理还是通过定时扫描xml文件去跟新，但放到项目上就各种问题，由于用了mybatisplus死活不生效。本着"即插即用"的原则，狠心...
前几天在琢磨mybatis xml热加载的问题，原理还是通过定时扫描xml文件去跟新，但放到项目上就各种问题，由于用了mybatisplus死活不生效。本着"即插即用"的原则，狠心把其中的代码优化了一遍，能够兼容mybatisplus，还加入了一些日志，直接上代码
package com.bzd.core.mybatis;
import java.io.file;
import java.io.filenotfoundexception;
import java.io.ioexception;
import java.io.inputstream;
import java.lang.reflect.field;
import java.net.url;
import java.util.arraylist;
import java.util.hashmap;
import java.util.list;
import java.util.map;
import java.util.properties;
import java.util.set;
import lombok.sneakythrows;
import org.apache.commons.lang3.stringutils;
import org.apache.ibatis.builder.xml.xmlmapperbuilder;
import org.apache.ibatis.executor.errorcontext;
import org.apache.ibatis.session.configuration;
import org.slf4j.logger;
import org.slf4j.loggerfactory;
import org.springframework.core.nestedioexception;
import org.springframework.core.io.resource;
import com.google.common.collect.sets;
/**
* 刷新mybatis mapper xml 线程
* @author thinkgem
* @version 2016-5-29
*/
public class mapperrefresh implements java.lang.runnable {
public static logger log = loggerfactory.getlogger(mapperrefresh.class);
private static string filename = "mybatis-refresh.properties";
private static properties prop = new properties();
private static boolean enabled; // 是否启用mapper刷新线程功能
private static boolean refresh; // 刷新启用后，是否启动了刷新线程
private set<string> location; // mapper实际资源路径
private resource[] mapperlocations; // mapper资源路径
private configuration configuration; // mybatis配置对象
private long beforetime = 0l; // 上一次刷新时间
private static int delayseconds; // 延迟刷新秒数
private static int sleepseconds; // 休眠时间
private static string mappingpath; // xml文件夹匹配字符串，需要根据需要修改
static {
// try {
// prop.load(mapperrefresh.class.getresourceasstream(filename));
// } catch (exception e) {
// e.printstacktrace();
// system.out.println("load mybatis-refresh “"+filename+"” file error.");
// }
url url = mapperrefresh.class.getclassloader().getresource(filename);
inputstream is;
try {
is = url.openstream();
if (is == null) {
log.warn("applicationconfig.properties not found.");
} else {
prop.load(is);
}
} catch (ioexception e) {
e.printstacktrace();
}
string value = getpropstring("enabled");
system.out.println(value);
enabled = "true".equalsignorecase(value);
delayseconds = getpropint("delayseconds");
sleepseconds = getpropint("sleepseconds");
//mappingpath = getpropstring("mappingpath");
delayseconds = delayseconds == 0 ? 50 : delayseconds;
sleepseconds = sleepseconds == 0 ? 3 : sleepseconds;
mappingpath = stringutils.isblank(mappingpath) ? "mappings" : mappingpath;
log.debug("[enabled] " + enabled);
log.debug("[delayseconds] " + delayseconds);
log.debug("[sleepseconds] " + sleepseconds);
log.debug("[mappingpath] " + mappingpath);
}
public static boolean isrefresh() {
return refresh;
}
public mapperrefresh(resource[] mapperlocations, configuration configuration) {
this.mapperlocations = mapperlocations;
this.configuration = configuration;
}
@override
public void run() {
beforetime = system.currenttimemillis();
log.debug("[location] " + location);
log.debug("[configuration] " + configuration);
if (enabled) {
// 启动刷新线程
final mapperrefresh runnable = this;
new thread(new java.lang.runnable() {
@sneakythrows
@override
public void run() {
/*if (location == null){
location = sets.newhashset();
log.debug("mapperlocation's length:" + mapperlocations.length);
for (resource mapperlocation : mapperlocations) {
string s = mapperlocation.tostring().replaceall("\\\\", "/");
s = s.substring("file [".length(), s.lastindexof(mappingpath) + mappingpath.length());
s = mapperlocation.getfile().getparent();
if (!location.contains(s)) {
location.add(s);
log.debug("location:" + s);
}
}
log.debug("locarion's size:" + location.size());
}*/
try {
thread.sleep(delayseconds * 1000);
} catch (interruptedexception e2) {
e2.printstacktrace();
}
refresh = true;
system.out.println("========= enabled refresh mybatis mapper =========");
while (true) {
try {
log.info("start refresh");
list<resource> res = getmodifyresource(mapperlocations,beforetime);
if(res.size()>0)
runnable.refresh(res);
// 如果刷新了文件，则修改刷新时间，否则不修改
beforetime = system.currenttimemillis();
log.info("end refresh("+res.size()+")");
} catch (exception e1) {
e1.printstacktrace();
}
try {
thread.sleep(sleepseconds * 1000);
} catch (interruptedexception e) {
e.printstacktrace();
}
}
}
}, "mybatis-mapper-refresh").start();
}
}
private list<resource> getmodifyresource(resource[] mapperlocations,long time){
list<resource> resources = new arraylist<>();
for (int i = 0; i < mapperlocations.length; i++) {
try {
if(ismodify(mapperlocations[i],time))
resources.add(mapperlocations[i]);
} catch (ioexception e) {
throw new runtimeexception("读取mapper文件异常",e);
}
}
return resources;
}
private boolean ismodify(resource resource,long time) throws ioexception {
if (resource.lastmodified() > time) {
return true;
}
return false;
}
/**
* 执行刷新
* @param filepath 刷新目录
* @param beforetime 上次刷新时间
* @throws nestedioexception 解析异常
* @throws filenotfoundexception 文件未找到
* @author thinkgem
*/
@suppresswarnings({ "rawtypes", "unchecked" })
private void refresh(list<resource> mapperlocations) throws exception {
// 获取需要刷新的mapper文件列表
/*list<file> filelist = this.getrefreshfile(new file(filepath), beforetime);
if (filelist.size() > 0) {
log.debug("refresh file: " + filelist.size());
}*/
for (int i = 0; i < mapperlocations.size(); i++) {
resource resource = mapperlocations.get(i);
inputstream inputstream = resource.getinputstream();
system.out.println("refreshed : "+resource.getdescription());
//这个是mybatis 加载的资源标识,没有绝对标准
string resourcepath = resource.getdescription();
try {
clearmybatis(resourcepath);
//重新编译加载资源文件。
xmlmapperbuilder xmlmapperbuilder = new xmlmapperbuilder(inputstream, configuration,
resourcepath, configuration.getsqlfragments());
xmlmapperbuilder.parse();
} catch (exception e) {
throw new nestedioexception("failed to parse mapping resource: '" + resourcepath + "'", e);
} finally {
errorcontext.instance().reset();
}
// system.out.println("refresh file: " + mappingpath + stringutils.substringafterlast(filelist.get(i).getabsolutepath(), mappingpath));
/*if (log.isdebugenabled()) {
log.debug("refresh file: " + filelist.get(i).getabsolutepath());
log.debug("refresh filename: " + filelist.get(i).getname());
}*/
}
}
private void clearmybatis(string resource) throws nosuchfieldexception, illegalaccessexception {
// 清理原有资源，更新为自己的strictmap方便，增量重新加载
string[] mapfieldnames = new string[]{
"mappedstatements", "caches",
"resultmaps", "parametermaps",
"keygenerators", "sqlfragments"
};
for (string fieldname : mapfieldnames){
field field = configuration.getclass().getdeclaredfield(fieldname);
field.setaccessible(true);
map map = ((map)field.get(configuration));
if (!(map instanceof strictmap)){
map newmap = new strictmap(stringutils.capitalize(fieldname) + "collection");
for (object key : map.keyset()){
try {
newmap.put(key, map.get(key));
}catch(illegalargumentexception ex){
newmap.put(key, ex.getmessage());
}
}
field.set(configuration, newmap);
}
}
// 清理已加载的资源标识，方便让它重新加载。
field loadedresourcesfield = configuration.getclass().getdeclaredfield("loadedresources");
loadedresourcesfield.setaccessible(true);
set loadedresourcesset = ((set)loadedresourcesfield.get(configuration));
loadedresourcesset.remove(resource);
}
/**
* 获取需要刷新的文件列表
* @param dir 目录
* @param beforetime 上次刷新时间
* @return 刷新文件列表
*/
private list<file> getrefreshfile(file dir, long beforetime) {
list<file> filelist = new arraylist<file>();
file[] files = dir.listfiles();
if (files != null) {
for (int i = 0; i < files.length; i++) {
file file = files[i];
if (file.isdirectory()) {
filelist.addall(this.getrefreshfile(file, beforetime));
} else if (file.isfile()) {
if (this.checkfile(file, beforetime)) {
filelist.add(file);
}
} else {
system.out.println("error file." + file.getname());
}
}
}
return filelist;
}
/**
* 判断文件是否需要刷新
* @param file 文件
* @param beforetime 上次刷新时间
* @return 需要刷新返回true，否则返回false
*/
private boolean checkfile(file file, long beforetime) {
if (file.lastmodified() > beforetime) {
return true;
}
return false;
}
/**
* 获取整数属性
* @param key
* @return
*/
private static int getpropint(string key) {
int i = 0;
try {
i = integer.parseint(getpropstring(key));
} catch (exception e) {
}
return i;
}
/**
* 获取字符串属性
* @param key
* @return
*/
private static string getpropstring(string key) {
return prop == null ? null : prop.getproperty(key).trim();
}
/**
* 重写 org.apache.ibatis.session.configuration.strictmap 类
* 来自 mybatis3.4.0版本，修改 put 方法，允许反复 put更新。
*/
public static class strictmap<v> extends hashmap<string, v> {
private static final long serialversionuid = -4950446264854982944l;
private string name;
public strictmap(string name, int initialcapacity, float loadfactor) {
super(initialcapacity, loadfactor);
this.name = name;
}
public strictmap(string name, int initialcapacity) {
super(initialcapacity);
this.name = name;
}
public strictmap(string name) {
super();
this.name = name;
}
public strictmap(string name, map<string, ? extends v> m) {
super(m);
this.name = name;
}
@suppresswarnings("unchecked")
public v put(string key, v value) {
// thinkgem 如果现在状态为刷新，则刷新(先删除后添加)
if (mapperrefresh.isrefresh()) {
remove(key);
// mapperrefresh.log.debug("refresh key:" + key.substring(key.lastindexof(".") + 1));
}
// thinkgem end
if (containskey(key)) {
throw new illegalargumentexception(name + " already contains value for " + key);
}
if (key.contains(".")) {
final string shortkey = getshortname(key);
if (super.get(shortkey) == null) {
super.put(shortkey, value);
} else {
super.put(shortkey, (v) new ambiguity(shortkey));
}
}
return super.put(key, value);
}
public v get(object key) {
v value = super.get(key);
if (value == null) {
throw new illegalargumentexception(name + " does not contain value for " + key);
}
if (value instanceof ambiguity) {
throw new illegalargumentexception(((ambiguity) value).getsubject() + " is ambiguous in " + name
+ " (try using the full name including the namespace, or rename one of the entries)");
}
return value;
}
private string getshortname(string key) {
final string[] keyparts = key.split("\\.");
return keyparts[keyparts.length - 1];
}
protected static class ambiguity {
private string subject;
public ambiguity(string subject) {
this.subject = subject;
}
public string getsubject() {
return subject;
}
}
}
}
这里提供两种配置方式一种是springboot，一种就是普通的spring项目
1.springboot 方式 就是
package com.bzd.bootadmin.conf;
import com.bzd.core.mybatis.mapperrefresh;
import org.apache.ibatis.session.sqlsessionfactory;
import org.mybatis.spring.annotation.mapperscan;
import org.mybatis.spring.boot.autoconfigure.mybatisproperties;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.context.annotation.configuration;
import org.springframework.core.io.resource;
import javax.annotation.postconstruct;
/**
*
* @author created by bzd on 2020/12/28/15:10
**/
@configuration
@mapperscan(value = {"com.bzd.bootadmin.modular.index.mapper"})
public class mybatisconfig {
@autowired
sqlsessionfactory factory;
@autowired
mybatisproperties properties;
@postconstruct
public void postconstruct() {
resource[] resources = this.properties.resolvemapperlocations();
new mapperrefresh(resources, factory.getconfiguration()).run();
}
}
2：普通spring项目
import org.apache.ibatis.session.configuration;
import org.apache.ibatis.session.sqlsessionfactory;
import org.springframework.core.io.resource;
import javax.annotation.postconstruct;
import java.io.ioexception;
import java.lang.reflect.invocationtargetexception;
import java.lang.reflect.method;
/**
* created by lxr on 2020/5/3
**/
public class refreshstarter {
sqlsessionfactory factory;
resource[] mapperlocations;
@postconstruct
public void postconstruct() throws ioexception {
resource[] resources = mapperlocations;
enablemybatisplusrefresh(factory.getconfiguration());
new mapperrefresh(resources, factory.getconfiguration()).run();
}
/**
* 反射配置开启 mybatisplus 的 refresh,不使用mybatisplus也不会有影响
* @param configuration
*/
public void enablemybatisplusrefresh(configuration configuration){
try {
method method = class.forname("com.baomidou.mybatisplus.toolkit.globalconfigutils")
.getmethod("getglobalconfig", configuration.class);
object globalconfiguration = method.invoke(null, configuration);
method = class.forname("com.baomidou.mybatisplus.entity.globalconfiguration")
.getmethod("setrefresh", boolean.class);
method.invoke(globalconfiguration, true);
} catch (classnotfoundexception e) {
} catch (nosuchmethodexception e) {
e.printstacktrace();
} catch (illegalaccessexception e) {
e.printstacktrace();
} catch (invocationtargetexception e) {
e.printstacktrace();
}
}
public sqlsessionfactory getfactory() {
return factory;
}
public void setfactory(sqlsessionfactory factory) {
this.factory = factory;
}
public resource[] getmapperlocations() {
return mapperlocations;
}
public void setmapperlocations(resource[] mapperlocations) {
this.mapperlocations = mapperlocations;
}
}
在xml中配置
<bean class="com.foxtail.core.mybatis.refreshstarter"> <property name="mapperlocations"> <array> <value>classpath:com/foxtail/mapping/*/*.xml</value> <value>classpath:com/foxtail/mapping/*.xml</value> </array> </property> <property name="factory" ref="sqlsessionfactory" /> </bean>
最后在resources中加入mybatis-refresh.properties
#是否开启刷新线程 enabled=true #延迟启动刷新程序的秒数 delayseconds=5 #刷新扫描间隔的时长秒数 sleepseconds=3
到这里就大功告成了，最后加到代码里面有没有生效呢，改完sql之后总会想到底是更新了还是没更新，又看不到，这是程序员最头疼的。因为加了日志都不用担心啦
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