def pend_io(self,timeout=None):
"""Flush the send buffer and wait until outstanding queries complete
or the specified timeout expires.
Parameters:
timeout: seconds to wait
"""
if timeout is None:
if self.__timeout is None:
timeout = CaChannel.ca_timeout
else:
timeout = self.__timeout
status = ca.pend_io(float(timeout))
if status != 0:
raise CaChannelException, ca.caError._caErrorMsg[status]
def pend_io(self, timeout=None):
"""Flush the send buffer and wait until outstanding queries complete
or the specified timeout expires.
Parameters:
timeout: seconds to wait
"""
if timeout is None:
if self.__timeout is None:
timeout = CaChannel.ca_timeout
else:
timeout = self.__timeout
status = ca.pend_io(float(timeout))
if status != 0:
raise CaChannelException, ca.caError._caErrorMsg[status]
def searchw(self, pvName=None):
"""Attempt to establish a connection to a process variable.
Parameters:
pvName: process variable name
>>> chan = CaChannel('non-exist-channel')
>>> chan.searchw()
Traceback (most recent call last):
...
CaChannelException: User specified timeout on IO operation expired
"""
if pvName is None:
pvName = self.pvname
else:
self.pvname = pvName
self.__chid = ca.search(pvName, None)
if self.__timeout is None:
timeout = CaChannel.ca_timeout
else:
timeout = self.__timeout
status = ca.pend_io(timeout)
if status != 0:
raise CaChannelException, ca.caError._caErrorMsg[status]
def searchw(self, pvName=None):
"""Attempt to establish a connection to a process variable.
Parameters:
pvName: process variable name
>>> chan = CaChannel('non-exist-channel')
>>> chan.searchw()
Traceback (most recent call last):
...
CaChannelException: User specified timeout on IO operation expired
"""
if pvName is None:
pvName = self.pvname
else:
self.pvname = pvName
self.__chid = ca.search(pvName, None)
if self.__timeout is None:
timeout = CaChannel.ca_timeout
else:
timeout = self.__timeout
status = ca.pend_io(timeout)
if status != 0:
raise CaChannelException, ca.caError._caErrorMsg[status]
def _caput(function, name, value, wait_timeout=None, timeout=None, req_type=None, retries=None, read_check_tolerance=None): global cadict, defaultTimeout, defaultRetries, readCheckTolerance #print function if not name: print "%s: no PV name supplied" % function raise ca_utilException, EXCEPTION_NULL_NAME return if ((timeout == None) and (defaultTimeout != None)): timeout = defaultTimeout if ((retries == None) and (defaultRetries != None)): retries = defaultRetries if ((retries == None) or (retries == "NONE")): retries = 0 if ((read_check_tolerance == None) and (readCheckTolerance != None)): read_check_tolerance = readCheckTolerance retries = max(retries,0) retry = retries + 1 success = 0 checkName(name, timeout=timeout, retries=retries) while ((not success) and (retry > 0)): retry -= 1 entry = cadict[name] state = castate(name, timeout) #print "%s: state='%s'" % (function, state) if (state != 'connected'): print "%s: Repairing CA connection to '%s'" % (function, name) del cadict[name] retry += 1 else: if req_type == None: req_type=entry.field_type if ((timeout != None) and (timeout != "NONE")): entry.channel.setTimeout(timeout) entry.callbackReceived = 0 # in case we're doing caputw() #value = convertToType(value, req_type) try: if function == "caput": entry.channel.putw(value, req_type=req_type) else: #caputw retval = entry.channel.array_put_callback(value,req_type,entry.element_count,__ca_util_waitCB,name) except CaChannel.CaChannelException, status: print "put() threw an exception (%s)" % status if ((int(status) == ca.ECA_BADTYPE) or (int(status) == ca.ECA_DISCONN)): # Delete dictionary entry. This clears the CA connection. print "%s: Repairing CA connection to '%s'" % (function, name) del cadict[name] retry += 1 if retry <= 0: raise CaChannel.CaChannelException, status entry.callbackReceived = 1 return else: if ((read_check_tolerance == None) or (read_check_tolerance == "NONE")): success = True else: if timeout: ca.pend_io(timeout) else: ca.pend_io(1.0) readback_success = False count = 0 while ((not readback_success) and (count < retries+1)): try: readback = caget(name, req_type=req_type) native_readback = caget(name) readback_success = True if same(value, readback, native_readback, entry.field_type, read_check_tolerance): success = True #print "%s: Success\n" % (function) else: print "%s: readback '%s' disagrees with the value '%s' we wrote." % (function, readback, value) raise ca_utilException, EXCEPTION_READBACK_DISAGREES entry.callbackReceived = 1 except CaChannel.CaChannelException, status: print "%s: exception during readback." % (function) count += 1
>>> chan.searchw()
>>> chan.putw(['string 1','string 2'])
>>> chan.getw()
['string 1', 'string 2', '']
"""
if req_type is None: req_type = -1
val = self._setup_put(value, req_type)
try:
ca.put(self.__chid, val, None, None, req_type)
except ca.error,msg:
raise CaChannelException,msg
if self.__timeout is None:
timeout = CaChannel.ca_timeout
else:
timeout = self.__timeout
status = ca.pend_io(timeout)
if status != 0:
raise CaChannelException, ca.caError._caErrorMsg[status]
def getw(self, req_type=None, count=None):
"""Return a value or array of values from a channel.
Parameters:
req_type: database request type. Defaults to be the native data type.
count: number of data values to read, Defaults to be the native count.
"""
updated = [False]
value = [0]
def update_value(valstat):
if valstat is None:
return
try:
>>> chan.searchw()
>>> chan.putw(['string 1','string 2'])
>>> chan.getw()
['string 1', 'string 2', '']
"""
if req_type is None: req_type = -1
val = self._setup_put(value, req_type)
try:
ca.put(self.__chid, val, None, None, req_type)
except ca.error, msg:
raise CaChannelException, msg
if self.__timeout is None:
timeout = CaChannel.ca_timeout
else:
timeout = self.__timeout
status = ca.pend_io(timeout)
if status != 0:
raise CaChannelException, ca.caError._caErrorMsg[status]
def getw(self, req_type=None, count=None):
"""Return a value or array of values from a channel.
Parameters:
req_type: database request type. Defaults to be the native data type.
count: number of data values to read, Defaults to be the native count.
"""
updated = [False]
value = [0]
def update_value(valstat):
if valstat is None:
return
