/*
* (non-Javadoc)
* @see com.lmiky.admin.lock.service.LockService#isLock(java.lang.String)
*/
public boolean isLock(String lockTarget) throws LockException {
synchronized (mutex) {
try {
String key = CACHE_HEAD + lockTarget;
LockData lockData = (LockData) cache.get(key);
if (lockData == null) { // 未被加锁
return false;
} else if (System.currentTimeMillis() - lockData.getLockTime() > maxLockMillis) { // 超时
return false;
}
return true;
} catch (CacheException e) {
throw new LockException(e.getMessage());
}
}
}
/*
* (non-Javadoc)
* @see com.lmiky.admin.lock.service.LockService#lock(java.lang.String, java.lang.Long, java.lang.String)
*/
public void lock(String lockTarget, Long userId, String userName) throws LockException {
synchronized (mutex) {
try {
String cacheKey = CACHE_HEAD + lockTarget;
LockData lockData = (LockData) cache.get(cacheKey);
if (lockData == null) { // 未被加锁
lockData = new LockData(userId, userName, System.currentTimeMillis());
cache.put(cacheKey, lockData);
} else if (!lockData.getUserId().equals(userId)
&& System.currentTimeMillis() - lockData.getLockTime() < maxLockMillis) { // 已经加锁，并且还未超时
throw new LockException("locked by " + lockData.getUserName(), lockData.getUserName());
} else { // 被自己加锁或者加锁超时
lockData.setUserId(userId);
lockData.setUserName(userName);
lockData.setLockTime(System.currentTimeMillis());
}
} catch (CacheException e) {
throw new LockException(e.getMessage());
}
}
}