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#!/usr/bin/env python
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
import cqpid
from qmf2 import *
class ExampleAgent(AgentHandler):
"""
This example agent is implemented as a single class that inherits AgentHandler.
It does not use a separate thread since once set up, it is driven strictly by
incoming method calls.
"""
def __init__(self, url):
##
## Create and open a messaging connection to a broker.
##
self.connection = cqpid.Connection(url, "{reconnect:True}")
self.session = None
self.connection.open()
##
## Create, configure, and open a QMFv2 agent session using the connection.
##
self.session = AgentSession(self.connection, "{interval:30}")
self.session.setVendor('profitron.com')
self.session.setProduct('blastinator')
self.session.setAttribute('attr1', 1000)
self.session.open()
##
## Initialize the parent class.
##
AgentHandler.__init__(self, self.session)
def shutdown(self):
"""
Clean up the session and connection.
"""
if self.session:
self.session.close()
self.connection.close()
def method(self, handle, methodName, args, subtypes, addr, userId):
"""
Handle incoming method calls.
"""
if addr == self.controlAddr:
self.control.methodCount += 1
try:
if methodName == "stop":
self.session.methodSuccess(handle)
self.cancel()
elif methodName == "echo":
handle.addReturnArgument("sequence", args["sequence"])
handle.addReturnArgument("map", args["map"])
self.session.methodSuccess(handle)
elif methodName == "event":
ev = Data(self.sch_event)
ev.text = args['text']
self.session.raiseEvent(ev, args['severity'])
self.session.methodSuccess(handle)
elif methodName == "fail":
if args['useString']:
self.session.raiseException(handle, args['stringVal'])
else:
ex = Data(self.sch_exception)
ex.whatHappened = "It Failed"
ex.howBad = 75
ex.details = args['details']
self.session.raiseException(handle, ex)
elif methodName == "create_child":
name = args['name']
child = Data(self.sch_child)
child.name = name
addr = self.session.addData(child, name)
handle.addReturnArgument("childAddr", addr.asMap())
self.session.methodSuccess(handle)
except BaseException, e:
self.session.raiseException(handle, "%r" % e)
def setupSchema(self):
"""
Create and register the schema for this agent.
"""
package = "com.profitron.bntor"
##
## Declare a schema for a structured exception that can be used in failed
## method invocations.
##
self.sch_exception = Schema(SCHEMA_TYPE_DATA, package, "exception")
self.sch_exception.addProperty(SchemaProperty("whatHappened", SCHEMA_DATA_STRING))
self.sch_exception.addProperty(SchemaProperty("howBad", SCHEMA_DATA_INT))
self.sch_exception.addProperty(SchemaProperty("details", SCHEMA_DATA_MAP))
##
## Declare a control object to test methods against.
##
self.sch_control = Schema(SCHEMA_TYPE_DATA, package, "control")
self.sch_control.addProperty(SchemaProperty("state", SCHEMA_DATA_STRING))
self.sch_control.addProperty(SchemaProperty("methodCount", SCHEMA_DATA_INT))
stopMethod = SchemaMethod("stop", desc="Stop Agent")
stopMethod.addArgument(SchemaProperty("message", SCHEMA_DATA_STRING, direction=DIR_IN))
self.sch_control.addMethod(stopMethod)
echoMethod = SchemaMethod("echo", desc="Echo Arguments")
echoMethod.addArgument(SchemaProperty("sequence", SCHEMA_DATA_INT, direction=DIR_IN_OUT))
echoMethod.addArgument(SchemaProperty("map", SCHEMA_DATA_MAP, direction=DIR_IN_OUT))
self.sch_control.addMethod(echoMethod)
eventMethod = SchemaMethod("event", desc="Raise an Event")
eventMethod.addArgument(SchemaProperty("text", SCHEMA_DATA_STRING, direction=DIR_IN))
eventMethod.addArgument(SchemaProperty("severity", SCHEMA_DATA_INT, direction=DIR_IN))
self.sch_control.addMethod(eventMethod)
failMethod = SchemaMethod("fail", desc="Expected to Fail")
failMethod.addArgument(SchemaProperty("useString", SCHEMA_DATA_BOOL, direction=DIR_IN))
failMethod.addArgument(SchemaProperty("stringVal", SCHEMA_DATA_STRING, direction=DIR_IN))
failMethod.addArgument(SchemaProperty("details", SCHEMA_DATA_MAP, direction=DIR_IN))
self.sch_control.addMethod(failMethod)
createMethod = SchemaMethod("create_child", desc="Create Child Object")
createMethod.addArgument(SchemaProperty("name", SCHEMA_DATA_STRING, direction=DIR_IN))
createMethod.addArgument(SchemaProperty("childAddr", SCHEMA_DATA_MAP, direction=DIR_OUT))
self.sch_control.addMethod(createMethod)
##
## Declare a child object
##
self.sch_child = Schema(SCHEMA_TYPE_DATA, package, "child")
self.sch_child.addProperty(SchemaProperty("name", SCHEMA_DATA_STRING))
##
## Declare the event class
##
self.sch_event = Schema(SCHEMA_TYPE_EVENT, package, "event")
self.sch_event.addProperty(SchemaProperty("text", SCHEMA_DATA_STRING))
##
## Register our schemata with the agent session.
##
self.session.registerSchema(self.sch_exception)
self.session.registerSchema(self.sch_control)
self.session.registerSchema(self.sch_child)
self.session.registerSchema(self.sch_event)
def populateData(self):
"""
Create a control object and give it to the agent session to manage.
"""
self.control = Data(self.sch_control)
self.control.state = "OPERATIONAL"
self.control.methodCount = 0
self.controlAddr = self.session.addData(self.control, "singleton")
try:
agent = ExampleAgent("localhost")
agent.setupSchema()
agent.populateData()
agent.run() # Use agent.start() to launch the agent in a separate thread
agent.shutdown()
except Exception, e:
print "Exception Caught:", e
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