Connection Adapters

class BaseConnection:
    """Abstract base class for all connection adapters."""
    
    def __init__(self, parameters, on_open_callback=None, on_open_error_callback=None,
                 on_close_callback=None):
        """
        Base connection initialization.
        
        Parameters:
        - parameters (ConnectionParameters): Connection configuration
        - on_open_callback (callable): Called when connection opens
        - on_open_error_callback (callable): Called on connection error
        - on_close_callback (callable): Called when connection closes
        """
    
    def channel(self, on_open_callback, channel_number=None):
        """
        Create a new channel asynchronously.
        
        Parameters:
        - on_open_callback (callable): Called when channel opens
        - channel_number (int, optional): Specific channel number
        """
    
    def close(self, reply_code=200, reply_text='Normal shutdown'):
        """
        Close connection.
        
        Parameters:
        - reply_code (int): AMQP reply code
        - reply_text (str): Human-readable reason
        """
    
    # Connection state properties
    @property
    def is_closed(self) -> bool:
        """True if connection is closed."""
    
    @property
    def is_open(self) -> bool:
        """True if connection is open."""

class AsyncioConnection(BaseConnection):
    """Connection adapter for Python asyncio."""
    
    def __init__(self, parameters, on_open_callback=None, on_open_error_callback=None,
                 on_close_callback=None, loop=None):
        """
        Create asyncio connection.
        
        Parameters:
        - parameters (ConnectionParameters): Connection configuration  
        - on_open_callback (callable): Called when connection opens
        - on_open_error_callback (callable): Called on connection error
        - on_close_callback (callable): Called when connection closes
        - loop (asyncio.AbstractEventLoop): Event loop (uses current if None)
        """
    
    def channel(self, on_open_callback, channel_number=None):
        """
        Create asyncio channel.
        
        Parameters:
        - on_open_callback (callable): Called when channel opens  
        - channel_number (int, optional): Specific channel number
        """

class TornadoConnection(BaseConnection):
    """Connection adapter for Tornado web framework."""
    
    def __init__(self, parameters, on_open_callback=None, on_open_error_callback=None,
                 on_close_callback=None, ioloop=None):
        """
        Create Tornado connection.
        
        Parameters:
        - parameters (ConnectionParameters): Connection configuration
        - on_open_callback (callable): Called when connection opens
        - on_open_error_callback (callable): Called on connection error  
        - on_close_callback (callable): Called when connection closes
        - ioloop (tornado.ioloop.IOLoop): Tornado IOLoop instance
        """

class TwistedProtocolConnection(BaseConnection):
    """Connection adapter for Twisted framework."""
    
    def __init__(self, parameters, on_open_callback=None, on_open_error_callback=None,
                 on_close_callback=None):
        """
        Create Twisted connection.
        
        Parameters:
        - parameters (ConnectionParameters): Connection configuration
        - on_open_callback (callable): Called when connection opens
        - on_open_error_callback (callable): Called on connection error
        - on_close_callback (callable): Called when connection closes
        """

class TwistedConnection(TwistedProtocolConnection):
    """Alias for TwistedProtocolConnection."""

class GeventConnection(BaseConnection):
    """Connection adapter for Gevent."""
    
    def __init__(self, parameters, on_open_callback=None, on_open_error_callback=None,
                 on_close_callback=None):
        """
        Create Gevent connection.
        
        Parameters:
        - parameters (ConnectionParameters): Connection configuration
        - on_open_callback (callable): Called when connection opens
        - on_open_error_callback (callable): Called on connection error
        - on_close_callback (callable): Called when connection closes
        """

class SelectConnection(BaseConnection):
    """Event-driven connection using select/poll/epoll."""
    
    def __init__(self, parameters, on_open_callback=None, on_open_error_callback=None,
                 on_close_callback=None, ioloop=None):
        """
        Create select-based connection.
        
        Parameters:
        - parameters (ConnectionParameters): Connection configuration
        - on_open_callback (callable): Called when connection opens
        - on_open_error_callback (callable): Called on connection error
        - on_close_callback (callable): Called when connection closes
        - ioloop (IOLoop): Event loop instance
        """
    
    @property
    def ioloop(self):
        """Get the IOLoop instance."""

class IOLoop:
    """Event loop implementation for SelectConnection."""
    
    def start(self):
        """Start the event loop."""
    
    def stop(self):
        """Stop the event loop."""
    
    def add_timeout(self, deadline, callback_method):
        """
        Add a timeout callback.
        
        Parameters:
        - deadline (float): Time when callback should be called
        - callback_method (callable): Callback function
        """
    
    def remove_timeout(self, timeout_id):
        """
        Remove a timeout callback.
        
        Parameters:
        - timeout_id: Timeout identifier to remove
        """
    
    def call_later(self, delay, callback, *args, **kwargs):
        """
        Schedule callback execution after delay.
        
        Parameters:
        - delay (float): Delay in seconds
        - callback (callable): Callback function
        - *args, **kwargs: Arguments for callback
        """

import asyncio
import pika
from pika.adapters.asyncio_connection import AsyncioConnection

async def main():
    # Connection callbacks
    def on_connection_open(connection):
        print('Connection opened')
        connection.channel(on_open_callback=on_channel_open)
    
    def on_connection_open_error(connection, error):
        print(f'Connection failed: {error}')
    
    def on_connection_closed(connection, reason):
        print(f'Connection closed: {reason}')
    
    def on_channel_open(channel):
        print('Channel opened')
        
        # Declare queue
        channel.queue_declare(
            queue='asyncio_test',
            callback=on_queue_declared
        )
    
    def on_queue_declared(method_frame):
        print('Queue declared')
        
        # Publish message
        channel.basic_publish(
            exchange='',
            routing_key='asyncio_test',
            body='Hello AsyncIO!'
        )
    
    # Create connection
    parameters = pika.ConnectionParameters('localhost')
    connection = AsyncioConnection(
        parameters,
        on_open_callback=on_connection_open,
        on_open_error_callback=on_connection_open_error,
        on_close_callback=on_connection_closed
    )
    
    # Keep running
    await asyncio.sleep(2)
    connection.close()

# Run the async function
asyncio.run(main())

import pika
from pika.adapters.tornado_connection import TornadoConnection
from tornado import ioloop

def on_connection_open(connection):
    print('Connection opened')
    connection.channel(on_open_callback=on_channel_open)

def on_connection_open_error(connection, error):
    print(f'Connection failed: {error}')
    ioloop.IOLoop.current().stop()

def on_connection_closed(connection, reason):
    print(f'Connection closed: {reason}')
    ioloop.IOLoop.current().stop()

def on_channel_open(channel):
    print('Channel opened')
    
    def on_queue_declared(method_frame):
        # Start consuming
        channel.basic_consume(
            queue='tornado_test',
            on_message_callback=on_message,
            auto_ack=True
        )
    
    # Declare queue
    channel.queue_declare(queue='tornado_test', callback=on_queue_declared)

def on_message(channel, method, properties, body):
    print(f'Received: {body.decode()}')
    
    # Stop after first message
    channel.close()

# Create connection
parameters = pika.ConnectionParameters('localhost')
connection = TornadoConnection(
    parameters,
    on_open_callback=on_connection_open,
    on_open_error_callback=on_connection_open_error,
    on_close_callback=on_connection_closed
)

# Start Tornado IOLoop
ioloop.IOLoop.current().start()

import pika
from pika.adapters.twisted_connection import TwistedProtocolConnection
from twisted.internet import reactor, defer

class TwistedExample:
    def __init__(self):
        self.connection = None
        self.channel = None
    
    def connect(self):
        parameters = pika.ConnectionParameters('localhost')
        self.connection = TwistedProtocolConnection(
            parameters,
            on_open_callback=self.on_connection_open,
            on_open_error_callback=self.on_connection_error,
            on_close_callback=self.on_connection_closed
        )
    
    def on_connection_open(self, connection):
        print('Connection opened')
        connection.channel(on_open_callback=self.on_channel_open)
    
    def on_connection_error(self, connection, error):
        print(f'Connection failed: {error}')
        reactor.stop()
    
    def on_connection_closed(self, connection, reason):
        print(f'Connection closed: {reason}')
        reactor.stop()
    
    def on_channel_open(self, channel):
        print('Channel opened')
        self.channel = channel
        
        # Declare queue
        channel.queue_declare(
            queue='twisted_test',
            callback=self.on_queue_declared
        )
    
    def on_queue_declared(self, method_frame):
        # Publish message
        self.channel.basic_publish(
            exchange='',
            routing_key='twisted_test',
            body='Hello Twisted!'
        )
        
        # Close connection after publishing
        reactor.callLater(1, self.connection.close)

# Usage
example = TwistedExample()
example.connect()
reactor.run()

import pika
from pika.adapters.gevent_connection import GeventConnection
import gevent

class GeventExample:
    def __init__(self):
        self.connection = None
        self.channel = None
        self.is_ready = False
    
    def connect(self):
        parameters = pika.ConnectionParameters('localhost')
        self.connection = GeventConnection(
            parameters,
            on_open_callback=self.on_connection_open,
            on_open_error_callback=self.on_connection_error,
            on_close_callback=self.on_connection_closed
        )
    
    def on_connection_open(self, connection):
        print('Connection opened')
        connection.channel(on_open_callback=self.on_channel_open)
    
    def on_connection_error(self, connection, error):
        print(f'Connection failed: {error}')
    
    def on_connection_closed(self, connection, reason):
        print(f'Connection closed: {reason}')
    
    def on_channel_open(self, channel):
        print('Channel opened')
        self.channel = channel
        self.is_ready = True
    
    def publish_message(self, message):
        if self.is_ready:
            self.channel.basic_publish(
                exchange='',
                routing_key='gevent_test',
                body=message
            )
            print(f'Published: {message}')

# Usage
example = GeventExample()
example.connect()

# Wait for connection to be ready
while not example.is_ready:
    gevent.sleep(0.1)

# Publish some messages
for i in range(5):
    example.publish_message(f'Message {i}')
    gevent.sleep(1)

example.connection.close()

import pika
from pika.adapters.select_connection import SelectConnection, IOLoop

class SelectExample:
    def __init__(self):
        self.connection = None
        self.channel = None
        self.ioloop = None
    
    def connect(self):
        # Create custom IOLoop
        self.ioloop = IOLoop()
        
        parameters = pika.ConnectionParameters('localhost')
        self.connection = SelectConnection(
            parameters,
            on_open_callback=self.on_connection_open,
            on_open_error_callback=self.on_connection_error,
            on_close_callback=self.on_connection_closed,
            ioloop=self.ioloop
        )
    
    def on_connection_open(self, connection):
        print('Connection opened')
        connection.channel(on_open_callback=self.on_channel_open)
    
    def on_connection_error(self, connection, error):
        print(f'Connection failed: {error}')
        self.ioloop.stop()
    
    def on_connection_closed(self, connection, reason):
        print(f'Connection closed: {reason}')
        self.ioloop.stop()
    
    def on_channel_open(self, channel):
        print('Channel opened')
        self.channel = channel
        
        # Schedule periodic message publishing
        self.schedule_publish()
    
    def schedule_publish(self):
        # Publish message
        self.channel.basic_publish(
            exchange='',
            routing_key='select_test',
            body='Hello Select!'
        )
        
        # Schedule next publish in 2 seconds
        self.ioloop.call_later(2.0, self.schedule_publish)
    
    def run(self):
        # Start the IOLoop
        self.ioloop.start()

# Usage
example = SelectExample()
example.connect()

# Stop after 10 seconds
example.ioloop.call_later(10.0, example.connection.close)

example.run()

import pika

def create_connection(adapter_type='blocking'):
    """Create connection based on adapter type."""
    parameters = pika.ConnectionParameters('localhost')
    
    if adapter_type == 'blocking':
        return pika.BlockingConnection(parameters)
    
    elif adapter_type == 'select':
        def on_open(connection):
            print('Select connection opened')
        
        return pika.SelectConnection(
            parameters,
            on_open_callback=on_open
        )
    
    elif adapter_type == 'asyncio':
        from pika.adapters.asyncio_connection import AsyncioConnection
        
        def on_open(connection):
            print('AsyncIO connection opened')
        
        return AsyncioConnection(
            parameters,
            on_open_callback=on_open
        )
    
    elif adapter_type == 'tornado':
        from pika.adapters.tornado_connection import TornadoConnection
        
        def on_open(connection):
            print('Tornado connection opened')
        
        return TornadoConnection(
            parameters,
            on_open_callback=on_open
        )
    
    else:
        raise ValueError(f"Unsupported adapter type: {adapter_type}")

# Usage examples
print("Available adapters:")
print("- blocking: Synchronous operations")  
print("- select: Event-driven with select/poll")
print("- asyncio: Python 3 async/await")
print("- tornado: Tornado web framework")
print("- twisted: Twisted framework") 
print("- gevent: Gevent cooperative multitasking")