프로젝트를 하다가 xml파일을 수정하면 일일이 서버를 내렷다가 다시 켜야 반영이되는 일이 많이 반복된다.
그래서 이번에 RefreshableSqlSessionFactoryBean라는 클래스파일을 사용하여 xml파일을 바로바로 적용할 수 있다.
일단 설정은 RefreshableSqlSessionFactoryBean이라는 java class파일을 하나 만들어야 한다.
1. java class 파일 만들기.(RefreshableSqlSessionFactoryBean)
<java />
import java.io.IOException;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Timer;
import java.util.TimerTask;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.core.io.Resource;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
public class RefreshableSqlSessionFactoryBean extends SqlSessionFactoryBean implements DisposableBean {
private static final Log log = LogFactory.getLog(RefreshableSqlSessionFactoryBean.class);
private SqlSessionFactory proxy;
private int interval = 500;
private Timer timer;
private TimerTask task;
private Resource[] mapperLocations;
/**
* 파일 감시 쓰레드가 실행중인지 여부.
*/
private boolean running = false;
private final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();
private final Lock r = rwl.readLock();
private final Lock w = rwl.writeLock();
public void setMapperLocations(Resource[] mapperLocations) {
super.setMapperLocations(mapperLocations);
this.mapperLocations = mapperLocations;
}
public void setInterval(int interval) {
this.interval = interval;
}
/**
* @throws Exception
*/
public void refresh() throws Exception {
if (log.isInfoEnabled()) {
log.info("refreshing sqlMapClient.");
}
w.lock();
try {
super.afterPropertiesSet();
} finally {
w.unlock();
}
}
/**
* 싱글톤 멤버로 SqlMapClient 원본 대신 프록시로 설정하도록 오버라이드.
*/
public void afterPropertiesSet() throws Exception {
super.afterPropertiesSet();
setRefreshable();
}
private void setRefreshable() {
proxy = (SqlSessionFactory) Proxy.newProxyInstance(
SqlSessionFactory.class.getClassLoader(),
new Class[]{SqlSessionFactory.class},
new InvocationHandler() {
public Object invoke(Object proxy, Method method,
Object[] args) throws Throwable {
// log.debug("method.getName() : " + method.getName());
return method.invoke(getParentObject(), args);
}
});
task = new TimerTask() {
private Map<Resource, Long> map = new HashMap<Resource, Long>();
public void run() {
if (isModified()) {
try {
refresh();
} catch (Exception e) {
log.error("caught exception", e);
}
}
}
private boolean isModified() {
boolean retVal = false;
if (mapperLocations != null) {
for (int i = 0; i < mapperLocations.length; i++) {
Resource mappingLocation = mapperLocations[i];
retVal |= findModifiedResource(mappingLocation);
}
}
return retVal;
}
private boolean findModifiedResource(Resource resource) {
boolean retVal = false;
List<String> modifiedResources = new ArrayList<String>();
try {
long modified = resource.lastModified();
if (map.containsKey(resource)) {
long lastModified = ((Long) map.get(resource))
.longValue();
if (lastModified != modified) {
map.put(resource, new Long(modified));
modifiedResources.add(resource.getDescription());
retVal = true;
}
} else {
map.put(resource, new Long(modified));
}
} catch (IOException e) {
log.error("caught exception", e);
}
if (retVal) {
if (log.isInfoEnabled()) {
log.info("modified files : " + modifiedResources);
}
}
return retVal;
}
};
timer = new Timer(true);
resetInterval();
}
private Object getParentObject() throws Exception {
r.lock();
try {
return super.getObject();
} finally {
r.unlock();
}
}
public SqlSessionFactory getObject() {
return this.proxy;
}
public Class<? extends SqlSessionFactory> getObjectType() {
return (this.proxy != null ? this.proxy.getClass()
: SqlSessionFactory.class);
}
public boolean isSingleton() {
return true;
}
public void setCheckInterval(int ms) {
interval = ms;
if (timer != null) {
resetInterval();
}
}
private void resetInterval() {
if (running) {
timer.cancel();
running = false;
}
if (interval > 0) {
timer.schedule(task, 0, interval);
running = true;
}
}
public void destroy() throws Exception {
timer.cancel();
}
}
2. context-mapper.xml 파일에 설정을 해준다.
<java />
<bean id="sqlSessionFactory" class="com.example.config.mybatis.RefreshableSqlSessionFactoryBean"> <!-- 서버 재시작 없이 mybatis mapper xml 파일을 reloading 하는 클래스 -->
<property name="dataSource" ref="dataSource" />
<property name="typeAliasesPackage" value="com.example" />
<property name="configLocation" value="classpath:mybatis/mybatis-config.xml" />
<property name="interval" value="5000" /> <!-- mapper xml 파일을 재로딩 하는 간격 -->
<property name="mapperLocations" value="classpath:com/example/**/dao/*Mapper.xml" />
<!-- 프로젝트에 맞게 mapperLocations을 수정한다.-->
</bean>
<!-- scan for mappers and let them be autowired -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.example" /> <!-- value값에 적용할 패키지를 작성해준다.-->
</bean>
이렇게 설정하면
프로젝트를 하면서 xml을 수정하면 refresh라는 로그와함께 xml이 바로바로 반영된다.
