Examples of org.hornetq.utils.UUID

org.hornetq.utils.UUID
UUID represents Universally Unique Identifiers (aka Global UID in Windows world). UUIDs are usually generated via UUIDGenerator (or in case of 'Null UUID', 16 zero bytes, via static method getNullUUID()), or received from external systems.
By default class caches the string presentations of UUIDs so that description is only created the first time it's needed. For memory stingy applications this caching can be turned off (note though that if uuid.toString() is never called, desc is never calculated so only loss is the space allocated for the desc pointer... which can of course be commented out to save memory).
Similarly, hash code is calculated when it's needed for the first time, and from thereon that value is just returned. This means that using UUIDs as keys should be reasonably efficient.
UUIDs can be compared for equality, serialized, cloned and even sorted. Equality is a simple bit-wise comparison. Ordering (for sorting) is done by first ordering based on type (in the order of numeric values of types), secondarily by time stamp (only for time-based time stamps), and finally by straight numeric byte-by-byte comparison (from most to least significant bytes).


   public String getJMSMessageID()
   {
      if (msgID == null)
      {
         UUID uid = message.getUserID();


         msgID = uid == null ? null : "ID:" + uid.toString();
      }
      return msgID;
   }

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      if (!disableMessageID)
      {
         // Generate a JMS id


         UUID uid = UUIDGenerator.getInstance().generateUUID();


         hqJmsMessage.getCoreMessage().setUserID(uid);


         hqJmsMessage.resetMessageID(null);
      }

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      {
         byte[] bytes = new byte[16];


         buffer.readBytes(bytes);


         uuid = new UUID(UUID.TYPE_TIME_BASED, bytes);
      }

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      address = buffer.readNullableSimpleString();
      if (buffer.readByte() == DataConstants.NOT_NULL)
      {
         byte[] bytes = new byte[16];
         buffer.readBytes(bytes);
         userID = new UUID(UUID.TYPE_TIME_BASED, bytes);
      }
      else
      {
         userID = null;
      }

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            nodeID = new SimpleString(uuid.toString());
         }
      }
      else
      {
         UUID currentUUID = storageManager.getPersistentID();


         if (currentUUID != null)
         {
            if (!currentUUID.equals(uuid))
            {
               throw new IllegalStateException("Backup server already has an id but it's not the same as live");
            }
         }
         else

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      address = buffer.readNullableSimpleString();
      if (buffer.readByte() == DataConstants.NOT_NULL)
      {
         byte[] bytes = new byte[16];
         buffer.readBytes(bytes);
         userID = new UUID(UUID.TYPE_TIME_BASED, bytes);
      }
      else
      {
         userID = null;
      }

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      {
         byte[] bytes = new byte[16];


         buffer.readBytes(bytes);


         uuid = new UUID(UUID.TYPE_TIME_BASED, bytes);
      }

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      else
      {
         byte[] bytes = new byte[16];
         id.position(0);
         id.get(bytes);
         uuid = new UUID(UUID.TYPE_TIME_BASED, bytes);
         nodeID = new SimpleString(uuid.toString());
      }
   }

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      else
      {
         byte[] bytes = new byte[16];
         id.position(0);
         id.get(bytes);
         uuid = new UUID(UUID.TYPE_TIME_BASED, bytes);
         nodeID = new SimpleString(uuid.toString());
      }
   }

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   public String getJMSMessageID()
   {
      if (msgID == null)
      {
         UUID uid = message.getUserID();


         msgID = uid == null ? null : "ID:" + uid.toString();
      }
      return msgID;
   }

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Related Classes of org.hornetq.utils.UUID

org.hornetq.core.message.impl.MessageImpl

org.hornetq.core.persistence.impl.journal.JournalStorageManager$PersistentIDEncoding

org.hornetq.core.server.impl.FileLockNodeManager

org.hornetq.core.server.impl.HornetQServerImpl

org.hornetq.core.server.impl.ServerSessionImpl

org.hornetq.core.server.NodeManager

org.hornetq.jms.client.HornetQMessage

org.hornetq.jms.client.HornetQMessageProducer

org.hornetq.rest.queue.PostMessage

org.hornetq.tests.integration.cluster.RealNodeManagerTest

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