ReentrantLock修饰类文件，实现按类获取锁的逻辑

1.ReentrantLock 给类文件加锁，实现类似synchronized(class)的功能

核心是类文件中，使用static修饰的reentrantLock对象

public class SourceCache {

    public static final Lock reentrantLock = new ReentrantLock();

    /**
     * 系统名，devopsdata的映射map
     */
    private static Map<String,DevopsData> devopsDataCache;

    /**
     * 系统名, jonedata的映射map
     */
    private static Map<String,JoneData> joneDataCache;

    public static Map<String, DevopsData> getDevopsDataCache() {
        return devopsDataCache;
    }

    public static Map<String, JoneData> getJoneDataCache() {
        return joneDataCache;
    }

    public static void setDevopsDataCache(Map<String, DevopsData> devopsDataCache) {
        reentrantLock.lock();
        try {
            SourceCache.devopsDataCache = devopsDataCache;
        }finally {
            reentrantLock.unlock();
        }
    }

    public static void setJoneDataCache(Map<String, JoneData> joneDataCache) {
        reentrantLock.lock();
        try {
            SourceCache.joneDataCache = joneDataCache;
        }finally {
            reentrantLock.unlock();
        }
    }

}

2.加锁，执行写入，解锁三部曲

reentrantLock.lock();
try {
    SourceCache.joneDataCache = joneDataCache;
}finally {
    reentrantLock.unlock();
}