package com.st.tks.utils.mybatis;
import com.google.common.collect.Sets;
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.apache.ibatis.session.SqlSessionFactory;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.core.NestedIOException;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.stereotype.Component;
import org.springframework.util.ClassUtils;
import javax.annotation.PostConstruct;
import java.io.;
import java.lang.reflect.Field;
import java.util.;
@Component
public class MapperRefresh implements ApplicationContextAware {
private static org.slf4j.Logger log = LoggerFactory.getLogger(MapperRefresh.class.getName());
private static String filename = "/conf/mybatis-refresh.properties";
private static Properties prop = new Properties();
private ApplicationContext applicationContext ;
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 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
private static final String XML_RESOURCE_PATTERN = "**/*.xml";
private String basePackage = "/mybatis";
static {
try {
prop.load(MapperRefresh.class.getResourceAsStream(filename));
} catch (Exception e) {
log.error("Load mybatis-refresh “"+filename+"” file error.");
}
enabled = "true".equalsIgnoreCase(getPropString("enabled"));
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);
}
@PostConstruct
public void start() throws IOException {
SqlSessionFactory factory = applicationContext.getBean(SqlSessionFactory.class);
Configuration configuration = factory.getConfiguration();
this.configuration = configuration ;
mapperLocations = getResource(basePackage, XML_RESOURCE_PATTERN);
exeTask();
}
public static boolean isRefresh() {
return refresh;
}
public void exeTask() {
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 Runnable() {
@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());
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;
log.info("========= Enabled refresh mybatis mapper =========");
while (true) {
try {
for (String s : location) {
runnable.refresh(s, beforeTime);
}
} catch (Exception e1) {
e1.printStackTrace();
}
try {
Thread.sleep(sleepSeconds * 1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}, "MyBatis-Mapper-Refresh").start();
}
}
/**
* 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(String filePath, Long beforeTime) throws Exception {
// 本次刷新时间
Long refrehTime = System.currentTimeMillis();
// 获取需要刷新的Mapper文件列表
List fileList = this.getRefreshFile(new File(filePath), beforeTime);
if (fileList.size() > 0) {
log.debug("Refresh file: " + fileList.size());
}
for (int i = 0; i < fileList.size(); i++) {
InputStream inputStream = new FileInputStream(fileList.get(i));
String resource = fileList.get(i).getAbsolutePath();
try {
// 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);
//重新编译加载资源文件。
XMLMapperBuilder xmlMapperBuilder = new XMLMapperBuilder(inputStream, configuration,
resource, configuration.getSqlFragments());
xmlMapperBuilder.parse();
} catch (Exception e) {
throw new NestedIOException("Failed to parse mapping resource: '" + resource + "'", e);
} finally {
ErrorContext.instance().reset();
}
if (log.isDebugEnabled()) {
log.debug("Refresh file: " + fileList.get(i).getAbsolutePath());
log.debug("Refresh filename: " + fileList.get(i).getName());
}
}
if (fileList.size() > 0) {
this.beforeTime = refrehTime;
}
}
/**
* 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 getRefreshFile(File dir, Long beforeTime) {
List fileList = new ArrayList();
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);
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.applicationContext = applicationContext ;
}
/**
* 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 extends HashMap {
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 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);
}
// 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;
}
}
}
public Resource[] getResource(String basePackage, String pattern) throws IOException {
String packageSearchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX
+ ClassUtils.convertClassNameToResourcePath(applicationContext.getEnvironment().resolveRequiredPlaceholders(
basePackage)) + "/" + pattern;
ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
Resource[] resources = resourcePatternResolver.getResources(packageSearchPath);
return resources;
} }