@Override
protected boolean swapAndClearCache(String namespaceKey, String cacheKey) {
final Lock lock = nsLocks.get(namespaceKey);
lock.lock();
try {
Preconditions.checkArgument(
mmapDB.exists(cacheKey), "Namespace [%s] does not exist", cacheKey);
final String swapCacheKey = UUID.randomUUID().toString();
mmapDB.rename(cacheKey, swapCacheKey);
final String priorCache = currentNamespaceCache.put(namespaceKey, swapCacheKey);
if (priorCache != null) {
// TODO: resolve what happens here if query is actively going on
mmapDB.delete(priorCache);
dataSize.set(tmpFile.length());
return true;
} else {
dataSize.set(tmpFile.length());
return false;
}
} finally {
lock.unlock();
}
}
public long getQuotaUsage(String username) {
if (!db.exists(username)) db.createAtomicLong(username, 0);
return db.getAtomicLong(username).get();
}
