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# This sample demonstrates how to register a callback to receive Event messages
# from the DXL fabric. Once the callback is registered, the sample sends a
# set number of Event messages to the fabric and waits for them all to be
# received by the callback.
from __future__ import absolute_import
from __future__ import print_function
import logging
import os
import sys
import time
from threading import Condition
from dxlclient.callbacks import EventCallback
from dxlclient.client import DxlClient
from dxlclient.client_config import DxlClientConfig
from dxlclient.message import Event
# Import common logging and configuration
sys.path.append(os.path.dirname(os.path.abspath(__file__)) + "/..")
from common import *
# Configure local logger
logger = logging.getLogger(__name__)
# The topic to publish to
EVENT_TOPIC = "/isecg/sample/basicevent"
# The total number of events to send
# Condition/lock used to protect changes to counter
event_count_condition = Condition()
# The events received (use an array so we can modify in callback)
event_count = [0]
# Create DXL configuration from file
config = DxlClientConfig.create_dxl_config_from_file(CONFIG_FILE)
# Create the client
with DxlClient(config) as client:
# Connect to the fabric
# Register callback and subscribe
# Create and add event listener
class MyEventCallback(EventCallback):
def on_event(self, event):
with event_count_condition:
# Print the payload for the received event
print("Received event: " + event.payload.decode())
# Increment the count
event_count[0] += 1
# Notify that the count was increment
# Register the callback with the client
client.add_event_callback(EVENT_TOPIC, MyEventCallback())
# Send events
# Record the start time
start = time.time()
# Loop and send the events
for event_id in range(TOTAL_EVENTS):
# Create the event
event = Event(EVENT_TOPIC)
# Set the payload
event.payload = str(event_id).encode()
# Send the event
# Wait until all events have been received
print("Waiting for events to be received...")
with event_count_condition:
while event_count[0] < TOTAL_EVENTS:
# Print the elapsed time
print("Elapsed time (ms): " + str((time.time() - start) * 1000))