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# |
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# Published interface for retrieving data updates via awips.dataaccess package |
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# SOFTWARE HISTORY |
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# Date Ticket# Engineer Description |
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# ------------ ---------- ----------- -------------------------- |
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# May 26, 2016 2416 rjpeter Initial Creation. |
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# Aug 1, 2016 2416 tgurney Finish implementation |
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# |
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# |
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""" |
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Interface for the DAF's data notification feature, which allows continuous |
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retrieval of new data as it is coming into the system. |
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There are two ways to access this feature: |
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1. The DataQueue module (awips.dataaccess.DataQueue) offers a collection that |
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automatically fills up with new data as it receives notifications. See that |
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module for more information. |
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2. Depending on the type of data you want, use either getGridDataUpdates() or |
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getGeometryDataUpdates() in this module. Either one will give you back an |
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object that will retrieve new data for you and will call a function you specify |
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each time new data is received. |
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Example code follows. This example prints temperature as observed from KOMA |
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each time a METAR is received from there. |
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from awips.dataaccess import DataAccessLayer as DAL |
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from awips.dataaccess import DataNotificationLayer as DNL |
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def process_obs(list_of_data): |
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for item in list_of_data: |
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print(item.getNumber('temperature')) |
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request = DAL.newDataRequest('obs') |
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request.setParameters('temperature') |
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request.setLocationNames('KOMA') |
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notifier = DNL.getGeometryDataUpdates(request) |
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notifier.subscribe(process_obs) |
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# process_obs will called with a list of data each time new data comes in |
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""" |
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import re |
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import sys |
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from awips.dataaccess.PyGeometryNotification import PyGeometryNotification |
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from awips.dataaccess.PyGridNotification import PyGridNotification |
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THRIFT_HOST = "edex" |
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USING_NATIVE_THRIFT = False |
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JMS_HOST_PATTERN = re.compile('tcp://([^:]+):([0-9]+)') |
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if 'jep' in sys.modules: |
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# intentionally do not catch if this fails to import, we want it to |
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# be obvious that something is configured wrong when running from within |
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# Java instead of allowing false confidence and fallback behavior |
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import JepRouter |
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router = JepRouter |
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else: |
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from awips.dataaccess import ThriftClientRouter |
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router = ThriftClientRouter.ThriftClientRouter(THRIFT_HOST) |
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USING_NATIVE_THRIFT = True |
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def _getJmsConnectionInfo(notifFilterResponse): |
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serverString = notifFilterResponse.getJmsConnectionInfo() |
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try: |
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host, port = JMS_HOST_PATTERN.match(serverString).groups() |
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except AttributeError: |
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raise RuntimeError('Got bad JMS connection info from server: ' + serverString) |
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return {'host': host, 'port': port} |
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def getGridDataUpdates(request): |
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""" |
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Get a notification object that receives updates to grid data. |
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Args: |
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request: the IDataRequest specifying the data you want to receive |
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Returns: |
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an update request object that you can listen for updates to by |
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calling its subscribe() method |
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""" |
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response = router.getNotificationFilter(request) |
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notificationFilter = response.getNotificationFilter() |
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jmsInfo = _getJmsConnectionInfo(response) |
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notifier = PyGridNotification(request, notificationFilter, |
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requestHost=THRIFT_HOST, **jmsInfo) |
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return notifier |
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def getGeometryDataUpdates(request): |
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""" |
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Get a notification object that receives updates to geometry data. |
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Args: |
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request: the IDataRequest specifying the data you want to receive |
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Returns: |
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an update request object that you can listen for updates to by |
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calling its subscribe() method |
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""" |
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response = router.getNotificationFilter(request) |
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notificationFilter = response.getNotificationFilter() |
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jmsInfo = _getJmsConnectionInfo(response) |
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notifier = PyGeometryNotification(request, notificationFilter, |
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requestHost=THRIFT_HOST, **jmsInfo) |
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return notifier |
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def changeEDEXHost(newHostName): |
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""" |
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Changes the EDEX host the Data Access Framework is communicating with. Only |
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works if using the native Python client implementation, otherwise, this |
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method will throw a TypeError. |
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Args: |
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newHostName: the EDEX host to connect to |
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""" |
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if USING_NATIVE_THRIFT: |
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global THRIFT_HOST |
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THRIFT_HOST = newHostName |
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global router |
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router = ThriftClientRouter.ThriftClientRouter(THRIFT_HOST) |
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else: |
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raise TypeError("Cannot call changeEDEXHost when using JepRouter.") |
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Unidata /
python-awips
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