Exemplo n.º 1
0
  @Override
  public void onDeliverIndication(JCsyncAbstractOperation op) {
    if (getConsistencyManager(op.getObjectID()) != null) {
      // if the consistency manager is already defined for the object related with this operation
      getConsistencyManager(op.getObjectID()).indicationReceived(op.changeTypeToRequest());

    } else {
      this.dcManager.indicationReceived(op.changeTypeToRequest());
    }
  }
Exemplo n.º 2
0
 @Override
 public synchronized Topic createSharedObject(
     String name, boolean blocking, AccessControlRules acRules)
     throws ObjectExistsException, Exception {
   if (this.sharedObjects.containsKey(name)) {
     throw ObjectExistsException.instance();
   } else {
     // preparing locker to wait for response
     try {
       JCsyncAbstractOperation operation =
           JCsyncAbstractOperation.get_OP_REQ_CREATE_SHARED_OBJECT(
               name, this.getNodeInfo().getName());
       // inform Consistency Manager before sending request
       this.dcManager.inititBuffer(name);
       this.dcManager.beforeRequestSend(operation, blocking);
       this.pubsubLayer.getCustomAlgorith().registerSharedObjectName(name);
       this.pubsubLayer.getCustomAlgorith().createTopic(name, false, acRules);
       Short respCode = (Short) this.dcManager.afterRequestSend(operation, blocking);
       if (respCode != null) {
         // if the topic was created
         if (respCode.shortValue() == JCSyncConstans.J_RESP_GENERAL_SUCCESS) {
           return this.pubsubLayer.getTopic(name);
           // if node can't subscribe to this topic
         } else if (respCode == JCSyncConstans.J_ERR_COLLECTION_EXISTS) {
           throw ObjectExistsException.instance();
         } else {
           log.fatal(
               "received UNHANLED respCode for operation: "
                   + operation.getOperationType()
                   + ", objectID:"
                   + operation.getObjectID());
         }
       } else {
         log.fatal(
             "received [null] respCode for operation: "
                 + operation.getOperationType()
                 + ", objectID:"
                 + operation.getObjectID());
       }
     } catch (InterruptedException e) {
       throw new Exception("An error while creating new shared object");
     }
   }
   log.error("(createSharedObject) returns Topic = null from unknow reason!");
   return null;
 }
Exemplo n.º 3
0
  @Override
  public synchronized Topic subscribeSharedObject(String name, boolean blocking)
      throws ObjectNotExistsException, OperationForbiddenException, Exception {
    // preparing locker to wait for response
    try {
      JCsyncAbstractOperation operation =
          JCsyncAbstractOperation.get_OP_REQ_SUBSCRIBE(name, this.getNodeInfo().getName());
      // inform Consistency Manager before sending request
      this.dcManager.inititBuffer(name);
      this.dcManager.beforeRequestSend(operation, blocking);
      this.pubsubLayer.getCustomAlgorith().registerSharedObjectName(name);
      this.pubsubLayer.getCustomAlgorith().networkSubscribe(name);
      Short respCode = (Short) this.dcManager.afterRequestSend(operation, blocking);
      if (respCode != null) {
        // if the topic was created
        if (respCode == JCSyncConstans.J_RESP_GENERAL_SUCCESS) {
          return this.pubsubLayer.getTopic(name);
          // if node can't subscribe to this topic
        } else if (respCode == JCSyncConstans.J_ERR_COLLECTION_AUTH_ERROR) {
          throw OperationForbiddenException.instance();
          // if the topic not exists
        } else if (respCode == JCSyncConstans.J_ERR_OBJECT_NOT_EXISTS) {
          throw ObjectNotExistsException.instance();
        } else {
          log.fatal(
              "received UNHANLED respCode for operation: "
                  + operation.getOperationType()
                  + ", objectID:"
                  + operation.getObjectID());
        }
      } else {
        log.fatal(
            "received [null] respCode for operation: "
                + operation.getOperationType()
                + ", objectID:"
                + operation.getObjectID());
      }

    } catch (InterruptedException e) {
      throw new Exception("An error on (subscribeSharedObject)");
    }
    log.error("(subscribeSharedObject) returns Topic = null from unknow reason!");
    return null;
  }
Exemplo n.º 4
0
  @Override
  public synchronized boolean unsubscribeSharedObject(String name, boolean blocking)
      throws ObjectNotExistsException, Exception {
    // preparing locker to wait for response
    try {
      JCsyncAbstractOperation operation =
          JCsyncAbstractOperation.get_OP_REQ_UNSUBSCRIBE(name, this.getNodeInfo().getName());
      // inform Consistency Manager before sending request
      this.dcManager.beforeRequestSend(operation, blocking);
      this.pubsubLayer.getCustomAlgorith().registerSharedObjectName(name);
      this.pubsubLayer.getCustomAlgorith().networkUnsubscribe(name);
      Short respCode = (Short) this.dcManager.afterRequestSend(operation, blocking);
      if (respCode != null) {
        if (respCode == JCSyncConstans.J_RESP_GENERAL_SUCCESS) {
          return true;
          // if the node is not a subscriber
        } else if (respCode == JCSyncConstans.J_ERR_OBJECT_NOT_EXISTS) {
          throw ObjectNotExistsException.instance();
        } else {
          log.fatal(
              "received UNHANLED respCode for operation: "
                  + operation.getOperationType()
                  + ", objectID:"
                  + operation.getObjectID());
        }
      } else {
        log.fatal(
            "received [null] respCode for operation: "
                + operation.getOperationType()
                + ", objectID:"
                + operation.getObjectID());
      }

    } catch (InterruptedException e) {
      throw new Exception("An error on (unsubscribeSharedObject)");
    }
    log.error("(unsubscribeSharedObject) returns false from unknown reason.");
    return false;
  }
Exemplo n.º 5
0
  @Override
  public void onDeliverRequest(PublishRequest req) {
    try {
      //        // TODO remove 4 lines below - just for debug
      //        byte[] details = req.getMessage();
      //        if (req.getEventType() == 1413) {
      //            System.out.println("zzz");
      //        }
      JCsyncAbstractOperation op = JCsyncAbstractOperation.encode(req.getMessage());
      op.setReqestID(req.getTransactionID());

      log.trace(
          this.pubsubLayer.getNodeInfo().getName()
              + " (onDeliverRequest) - [publisher]:"
              + req.getPublisher()
              + ", [node relay]:"
              + req.getSourceInfo()
              + ": "
              + op);
      if (this.checkIfAlreadyReceived(req)) {
        log.trace(
            this.pubsubLayer.getNodeInfo().getName()
                + " (onDeliverRequest): - received request that was aready received, skipping ... : "
                + op);
        return;
      }
      // check that this node can hold this request
      JCSyncAbstractSharedObject so = this.sharedObjects.get(op.getObjectID());
      if (so != null) {
        if ((op.getOperationType() & OP_REQ_GENERIC) == OP_REQ_GENERIC) {
          if (op.getOperationType() == OP_REQ_TRANSFER_OBJECT) {
            // there is no need to inform consistency manager about this kind of request, just send
            // response and indication
            sendResponse(req, PubSubConstants.RESP_SUCCESS);
            synchronized (so.operationIdIncrementLocker) {
              log.trace(
                  getNodeInfo().getName()
                      + ": transferring shared object with current operation id: "
                      + so.getCurrentOperationID()
                      + ", to node: "
                      + req.getPublisher());
              JCsyncAbstractOperation op_ =
                  JCsyncAbstractOperation.get_OP_IND_TRANSFER_OBJECT(
                      op.getObjectID(), so.encode(), req.getPublisher());
              op_.setReqestID(op.getReqestID());
              sendMessage(req, op_, false);
            }

          } else {
            // if this node is a root
            if (getAssignedTopic(req.getTopicID())
                .isTopicRoot(this.pubsubLayer.getNodeInfo().getID())) {
              AbstractConsistencyManager acm = getConsistencyManager(req.getTopicID());
              if (acm != null) {
                log.trace(
                    "(onDeliverRequest) - passing operation to consistency model: "
                        + op.toString());
                acm.requestReceived(req, op);
              } else {
                log.fatal(
                    "(onDeliverRequest) - there is no registered consistency manager for this operation: "
                        + op.toString());
              }
            } else {
              log.trace(
                  "(onDeliverRequest) - forwarding operation request to the parent node: "
                      + op.toString());
              this.pubsubLayer.forwardToParent(req, getAssignedTopic(req.getTopicID()));
            }
          }
        } else {
          log.fatal("(onDeliverRequest) - unhandled operation type: " + op.toString());
        }
      } else {
        if (op.getOperationType() == OP_REQ_TRANSFER_OBJECT) {
          log.trace(
              getNodeInfo().getName()
                  + ": (onDeliverRequest) - shared object not found!: "
                  + op.toString()
                  + ", forwarding request to the topic owner: "
                  + op.toString());
          this.pubsubLayer.forwardToOtherNode(
              req, this.pubsubLayer.getTopic(op.getObjectID()).getOwner().getNodeInfo());
        } else {
          log.fatal(
              getNodeInfo().getName()
                  + ": (onDeliverRequest) - shared object not found!: "
                  + op.toString());
          sendResponse(req, PubSubConstants.RESP_DOESNOTEXIST);
        }
      }
    } catch (Exception e) {
      log.error("An error occurred:", e);
    }
  }
Exemplo n.º 6
0
  /**
   * Sends operation as a pub-sub message thought overlay. If the <tt>blocking</tt> value is
   * <tt>true</tt> then working thread will be suspended until the response and indication (if
   * required) will be received from the overlay, if <tt>blocking</tt> value is <tt>false</tt> then
   * working thread will not be suspended and method returns <tt>null</tt>.<br>
   * Typically used to sends requests.
   *
   * @param op operation that will be send
   * @param blocking determines whenever the calling thread will be suspended until the results of
   *     given operation will be received.
   * @return the results of given operation or <tt>null</tt> if the blocking argument value is set
   *     to <tt>false</tt>
   * @throws Exception any error which was occurred during this operation
   */
  @Override
  public Object sendMessage(JCsyncAbstractOperation op, boolean blocking) throws Exception {
    // if the topic for this object is unknown then throw new exception
    try {
      this.request_response_locker.writeLock().lock();
      if (getAssignedTopic(op.getObjectID()) == null) {
        throw ObjectNotExistsException.instance();
      }
      // try to get the consistency manager if there is already selected
      AbstractConsistencyManager acm = getConsistencyManager(op.getObjectID());
      if (acm == null) {
        acm = this.dcManager;
      }
      short type = op.getOperationType();
      if ((type & OP_REQ_GENERIC) == OP_REQ_GENERIC) {
        acm.beforeRequestSend(op, blocking);
        this.pubsubLayer.getCustomAlgorith().registerSharedObjectName(op.getObjectID());
        Transaction t =
            this.pubsubLayer
                .getCustomAlgorith()
                .nextPublishTransaction(op.getObjectID(), op.getOperationType());
        op.setReqestID(t.getID());
        log.trace(
            "(sendMessage) - operation sent (blocking=["
                + blocking
                + "]) operation: "
                + op.toString());
        this.messagesToSend.put(new MessageToSend(op, t));
        this.request_response_locker.writeLock().unlock();
        Object result = acm.afterRequestSend(op, blocking);
        return result;

      } else if ((type & OP_INDICATION_GENERIC) == OP_INDICATION_GENERIC) {

        acm.beforeRequestSend(op, blocking);
        this.pubsubLayer.getCustomAlgorith().registerSharedObjectName(op.getObjectID());
        Transaction t =
            this.pubsubLayer
                .getCustomAlgorith()
                .nextPublishTransaction(op.getObjectID(), op.getOperationType());
        op.setReqestID(t.getID());
        log.trace(
            "(sendMessage) - operation sent (blocking=["
                + blocking
                + "]) operation: "
                + op.toString());
        this.messagesToSend.put(new MessageToSend(op, t));
        this.request_response_locker.writeLock().unlock();
        Object result = acm.afterRequestSend(op, blocking);
        return result;

      } else {
        log.error("Unhandled operation type: " + op.toString());
      }
    } catch (Exception e) {
      throw e;
    } finally {
      if (this.request_response_locker.writeLock().getHoldCount() > 0
          && this.request_response_locker.writeLock().isHeldByCurrentThread()) {
        this.request_response_locker.writeLock().unlock();
      }
    }

    return null;
  }