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#!/usr/bin/env python
# --------------------------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for license information.
# --------------------------------------------------------------------------------------------
"""
Example to show sending message(s) to a Service Bus Topic.
WARNING: ServiceBusClient, ServiceBusSender, and ServiceBusMessageBatch are not thread-safe.
Do not share these instances between threads without proper thread-safe management using mechanisms like `threading.Lock()`.
Note: Native async APIs should be used instead of running in a `ThreadPoolExecutor`, if possible.
"""
import os
import threading
from concurrent.futures import ThreadPoolExecutor
from azure.servicebus import ServiceBusClient, ServiceBusMessage
from azure.identity import DefaultAzureCredential
FULLY_QUALIFIED_NAMESPACE = os.environ["SERVICEBUS_FULLY_QUALIFIED_NAMESPACE"]
TOPIC_NAME = os.environ["SERVICEBUS_TOPIC_NAME"]
def send_single_message(sender):
message = ServiceBusMessage("Single Message")
sender.send_messages(message)
def send_a_list_of_messages(sender):
messages = [ServiceBusMessage("Message in list") for _ in range(10)]
sender.send_messages(messages)
def send_batch_message(sender):
batch_message = sender.create_message_batch()
for _ in range(10):
try:
batch_message.add_message(ServiceBusMessage("Message inside ServiceBusMessageBatch"))
except ValueError:
# ServiceBusMessageBatch object reaches max_size.
# New ServiceBusMessageBatch object can be created here to send more data.
break
sender.send_messages(batch_message)
def send_concurrent_with_shared_client_and_lock():
"""
Example showing concurrent sending with a shared client using threading.Lock.
Note: Native async APIs should be used instead of running in a ThreadPoolExecutor, if possible.
"""
send_lock = threading.Lock()
credential = DefaultAzureCredential()
servicebus_client = ServiceBusClient(FULLY_QUALIFIED_NAMESPACE, credential)
def send_with_lock(thread_id):
try:
# Use lock to ensure thread-safe sending
with send_lock:
sender = servicebus_client.get_topic_sender(topic_name=TOPIC_NAME)
with sender:
message = ServiceBusMessage(f"Synchronized message from thread {thread_id}")
sender.send_messages(message)
print(f"Thread {thread_id} sent synchronized message successfully")
except Exception as e:
print(f"Thread {thread_id} failed: {e}")
with servicebus_client:
with ThreadPoolExecutor(max_workers=3) as executor:
futures = [executor.submit(send_with_lock, i) for i in range(3)]
# Wait for all threads to complete
for future in futures:
future.result()
credential = DefaultAzureCredential()
servicebus_client = ServiceBusClient(FULLY_QUALIFIED_NAMESPACE, credential, logging_enable=True)
with servicebus_client:
sender = servicebus_client.get_topic_sender(topic_name=TOPIC_NAME)
with sender:
send_single_message(sender)
send_a_list_of_messages(sender)
send_batch_message(sender)
print("Send message is done.")
print("\nDemonstrating concurrent sending with shared client and locks...")
send_concurrent_with_shared_client_and_lock()
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