Method to streamline request for data from cache,
            Uses nearest time to get u,v,w,temp,salt

def data_nearest(self, i, currenttime):
        """
            Method to streamline request for data from cache,
            Uses nearest time to get u,v,w,temp,salt
        """
        if self.active.value is True:
            while self.get_data.value is True:
                logger.debug("Waiting for DataController to release cache file so I can read from it...")
                timer.sleep(2)
                pass

        if self.need_data(i):
            # Acquire lock for asking for data
            self.data_request_lock.acquire()
            self.has_data_request_lock.value = os.getpid()
            try:
                if self.need_data(i):

                    with self.read_lock:
                        self.read_count.value += 1
                        self.has_read_lock.append(os.getpid())

                    # Open netcdf file on disk from commondataset
                    self.dataset.opennc()
                    # Get the indices for the current particle location
                    indices = self.dataset.get_indices('u', timeinds=[np.asarray([i-1])], point=self.part.location )
                    self.dataset.closenc()

                    with self.read_lock:
                        self.read_count.value -= 1
                        self.has_read_lock.remove(os.getpid())

                    # Override the time
                    self.point_get.value = [indices[0]+1, indices[-2], indices[-1]]
                    # Request that the data controller update the cache
                    # DATA CONTOLLER STARTS
                    self.get_data.value = True
                    # Wait until the data controller is done
                    if self.active.value is True:
                        while self.get_data.value is True:
                            logger.debug("Waiting for DataController to update cache...")
                            timer.sleep(2)
                            pass
            except StandardError:
                raise
            finally:
                self.has_data_request_lock.value = -1
                self.data_request_lock.release()

        # Tell the DataController that we are going to be reading from the file
        if self.caching is True:
            with self.read_lock:
                self.read_count.value += 1
                self.has_read_lock.append(os.getpid())

        try:
            # Open netcdf file on disk from commondataset
            self.dataset.opennc()

            # Grab data at time index closest to particle location
            u = np.mean(np.mean(self.dataset.get_values('u', timeinds=[np.asarray([i])], point=self.part.location )))
            v = np.mean(np.mean(self.dataset.get_values('v', timeinds=[np.asarray([i])], point=self.part.location )))
            # if there is vertical velocity inthe dataset, get it
            if 'w' in self.dataset.nc.variables:
                w = np.mean(np.mean(self.dataset.get_values('w', timeindsf=[np.asarray([i])], point=self.part.location )))
            else:
                w = 0.0
            # If there is salt and temp in the dataset, get it
            if self.temp_name is not None and self.salt_name is not None:
                temp = np.mean(np.mean(self.dataset.get_values('temp', timeinds=[np.asarray([i])], point=self.part.location )))
                salt = np.mean(np.mean(self.dataset.get_values('salt', timeinds=[np.asarray([i])], point=self.part.location )))

            # Check for nans that occur in the ocean (happens because
            # of model and coastline resolution mismatches)
            if np.isnan(u).any() or np.isnan(v).any() or np.isnan(w).any():
                # Take the mean of the closest 4 points
                # If this includes nan which it will, result is nan
                uarray1 = self.dataset.get_values('u', timeinds=[np.asarray([i])], point=self.part.location, num=2)
                varray1 = self.dataset.get_values('v', timeinds=[np.asarray([i])], point=self.part.location, num=2)
                if 'w' in self.dataset.nc.variables:
                    warray1 = self.dataset.get_values('w', timeinds=[np.asarray([i])], point=self.part.location, num=2)
                    w = warray1.mean()
                else:
                    w = 0.0

                if self.temp_name is not None and self.salt_name is not None:
                    temparray1 = self.dataset.get_values('temp', timeinds=[np.asarray([i])], point=self.part.location, num=2)
                    saltarray1 = self.dataset.get_values('salt', timeinds=[np.asarray([i])], point=self.part.location, num=2)
                    temp = temparray1.mean()
                    salt = saltarray1.mean()
                u = uarray1.mean()
                v = varray1.mean()

            if self.temp_name is None:
                temp = np.nan
            if self.salt_name is None:
                salt = np.nan

            #logger.info(self.dataset.get_xyind_from_point('u', self.part.location, num=1))

        except StandardError:
            logger.error("Error in data_nearest on ForceParticle")
            raise
        finally:
            # If caching is False, we don't have to close the dataset.  We are in read only anyway.
            if self.caching is True:
                self.dataset.closenc()
                with self.read_lock:
                    self.read_count.value -= 1
                    self.has_read_lock.remove(os.getpid())

        return u, v, w, temp, salt