+ * Determine if the lock is a valid current lock holder.
+ *
+ * @param keyspace
+ * @param table
+ * @param key
+ * @param lockRef
+ * @return true if lockRef is a lock owner of key
+ * @throws MusicServiceException
+ * @throws MusicQueryException
+ */
+ public boolean isLockOwner(String keyspace, String table, String key, String lockRef)
+ throws MusicServiceException, MusicQueryException {
+ logger.info(EELFLoggerDelegate.applicationLogger,
+ "Checking in lock table for " + keyspace + "." + table + "." + key);
+ table = table_prepend_name + table;
+ String selectQuery =
+ "select * from " + keyspace + "." + table + " where key=?;";
+ PreparedQueryObject queryObject = new PreparedQueryObject();
+ queryObject.appendQueryString(selectQuery);
+ queryObject.addValue(key);
+ ResultSet rs = dsHandle.executeOneConsistencyGet(queryObject);
+
+ boolean topOfQueue = true;
+ for (Row row : rs) {
+ String lockReference = "" + row.getLong("lockReference");
+ if (row.isNull("writeLock") || row.getBool("writeLock")) {
+ if (topOfQueue && lockRef.equals(lockReference)) {
+ return true;
+ } else {
+ return false;
+ }
+ }
+ if (lockRef.equals(lockReference)) {
+ return true;
+ }
+ topOfQueue = false;
+ }
+ logger.info(EELFLoggerDelegate.applicationLogger, "Could not find " + lockRef
+ + " in the lock queue. It has expired and no longer exists.");
+ return false;
+ }
+
+ /**
+ * Determine if the lock is a valid current lock holder.
+ *
+ * @param keyspace
+ * @param table
+ * @param key
+ * @param lockRef
+ * @return true if lockRef is a lock owner of key
+ * @throws MusicServiceException
+ * @throws MusicQueryException
+ */
+ public LockObject getLockInfo(String keyspace, String table, String key, String lockRef)
+ throws MusicServiceException, MusicQueryException {
+ logger.info(EELFLoggerDelegate.applicationLogger,
+ "Checking in lock table for " + keyspace + "." + table + "." + key);
+ String lockQ_table = table_prepend_name + table;
+ String selectQuery =
+ "select * from " + keyspace + "." + lockQ_table + " where key=? and lockReference=?;";
+ PreparedQueryObject queryObject = new PreparedQueryObject();
+ queryObject.appendQueryString(selectQuery);
+ queryObject.addValue(key);
+ queryObject.addValue(Long.parseLong(lockRef));
+ ResultSet rs = dsHandle.executeOneConsistencyGet(queryObject);
+ Row row = rs.one();
+ if (row == null || row.isNull("lockReference")) {
+ return null;
+ }
+
+ String lockReference = "" + row.getLong("lockReference");
+ String createTime = row.getString("createTime");
+ String acquireTime = row.getString("acquireTime");
+ LockType locktype = row.isNull("writeLock") || row.getBool("writeLock") ? LockType.WRITE : LockType.READ;
+ boolean isLockOwner = isLockOwner(keyspace, table, key, lockRef);
+ String owner = row.getString("owner");
+
+ return new LockObject(isLockOwner, lockReference, createTime, acquireTime, locktype, owner);
+ }
+
+
+
+ /**
+ * This method removes the lock ref from the lock table/queue for the key.
+ *
+ * @param keyspace of the application.
+ * @param table of the application.