| package backtype.storm.utils; |
| |
| import java.util.HashMap; |
| import java.util.UUID; |
| |
| /** |
| * This class is used as part of testing Storm. It is used to keep track of "global metrics" |
| * in an atomic way. For example, it is used for doing fine-grained detection of when a |
| * local Storm cluster is idle by tracking the number of transferred tuples vs the number of processed |
| * tuples. |
| */ |
| public class RegisteredGlobalState { |
| private static HashMap<String, Object> _states = new HashMap<String, Object>(); |
| private static final Object _lock = new Object(); |
| |
| public static Object globalLock() { |
| return _lock; |
| } |
| |
| public static String registerState(Object init) { |
| synchronized(_lock) { |
| String id = UUID.randomUUID().toString(); |
| _states.put(id, init); |
| return id; |
| } |
| } |
| |
| public static void setState(String id, Object init) { |
| synchronized(_lock) { |
| _states.put(id, init); |
| } |
| } |
| |
| public static Object getState(String id) { |
| synchronized(_lock) { |
| Object ret = _states.get(id); |
| //System.out.println("State: " + ret.toString()); |
| return ret; |
| } |
| } |
| |
| public static void clearState(String id) { |
| synchronized(_lock) { |
| _states.remove(id); |
| } |
| } |
| } |