### Connect to AMQP Broker using Configuration Object

Source: https://github.com/funcmike/rabbitmq-nio/blob/main/README.md

Establishes a connection to an AMQP broker using a configuration object. This method allows for more granular control over connection parameters and relies on Swift-NIO for network operations.

```swift
let eventLoopGroup = MultiThreadedEventLoopGroup(numberOfThreads: 1)

var connection: AMQPConnection

do {
    connection = try await AMQPConnection.connect(use: eventLoopGroup.next(), from: .init(connection: .plain, server: .init()))

    print("Succesfully connected")
} catch {
    print("Error while connecting", error)
}
```

--------------------------------

### Open AMQP Channel

Source: https://github.com/funcmike/rabbitmq-nio/blob/main/README.md

Opens a new channel on an existing AMQP connection. Channels are multiplexed over a single connection and are used for performing AMQP operations. Errors during channel opening are caught and logged.

```swift
var channel: AMQPChannel
 
do {
    channel = try await connection.openChannel()

    print("Succesfully opened a channel")
} catch {
    print("Error while opening a channel", error)
}
```

--------------------------------

### Connect to AMQP Broker using Connection String

Source: https://github.com/funcmike/rabbitmq-nio/blob/main/README.md

Establishes a connection to an AMQP broker using a provided connection string. It utilizes a MultiThreadedEventLoopGroup for managing NIO threads and handles potential connection errors.

```swift
let eventLoopGroup = MultiThreadedEventLoopGroup(numberOfThreads: 1)

var connection: AMQPConnection

do {
    connection = try await AMQPConnection.connect(use: eventLoopGroup.next(), from: .init(url: "amqp://guest:guest@localhost:5672/%2f"))

    print("Succesfully connected")
} catch {
    print("Error while connecting", error)
}
```

--------------------------------

### Publish Message to Queue

Source: https://github.com/funcmike/rabbitmq-nio/blob/main/README.md

Publishes a message to a specified queue via the AMQP channel. The message content is provided as a ByteBuffer. Errors during publishing are caught and reported.

```swift
do {
    let deliveryTag = try await channel.basicPublish(
        from: ByteBuffer(string: "{}"),
        exchange: "",
        routingKey: "test"
    )

    print("Succesfully publish a message")
} catch {
    print("Error while publishing a message", error)
}
```

--------------------------------

### Retry Pattern for Channel/Connection Errors in Swift

Source: https://github.com/funcmike/rabbitmq-nio/blob/main/README.md

Demonstrates a simple retry pattern to re-create channels or connections when errors like `AMQPConnectionError.channelClosed` or `AMQPConnectionError.connectionClosed` occur during operations.

```swift
let eventLoopGroup = MultiThreadedEventLoopGroup(numberOfThreads: 1)
var connection =  try await AMQPConnection.connect(use: eventLoopGroup.next(), from: .init(connection: .plain, server: .init()))
var channel = try await connection.openChannel()

for _ in 0..<3 {
    do {
        let deliveryTag = try await channel.basicPublish(
            from: ByteBuffer(string: "{}"),
            exchange: "",
            routingKey: "test"
        )
        break
    } catch AMQPConnectionError.channelClosed {
        do {
            channel = try await connection.openChannel()
        } catch AMQPConnectionError.connectionClosed {
            connection = try await AMQPConnection.connect(use: eventLoopGroup.next(), from: .init(connection: .plain, server: .init()))
            channel = try await connection.openChannel()
        }
    } catch {
        print("Unknown problem", error)
    }
}
```

--------------------------------

### Safe Channel Pattern in Swift

Source: https://github.com/funcmike/rabbitmq-nio/blob/main/README.md

Implements a safe channel pattern by wrapping standard connection and channel objects in a class. This ensures a reusable channel is available before operations like publishing.

```swift
@available(macOS 12.0, *)
class SimpleSafeConnection {
    private let eventLoop: EventLoop
    private let config: AMQPConnectionConfiguration

    private var channel: AMQPChannel?
    private var connection: AMQPConnection?

    init(eventLoop: EventLoop, config: AMQPConnectionConfiguration) {
        self.eventLoop = eventLoop
        self.config = config
    }
    
    func reuseChannel() async throws -> AMQPChannel {
        guard let channel = self.channel, channel.isOpen else {
            if self.connection == nil || self.connection!.isConnected {
                self.connection = try await AMQPConnection.connect(use: self.eventLoop, from: self.config)
            }

            self.channel = try await connection!.openChannel()
            return self.channel!
        }
        return channel
    }
}

let eventLoopGroup = MultiThreadedEventLoopGroup(numberOfThreads: 1)
let connection = SimpleSafeConnection(eventLoop: eventLoopGroup.next(), config: .init(connection: .plain, server: .init()))

while(true) {
    let deliveryTag = try await connection.reuseChannel().basicPublish(
        from: ByteBuffer(string: "{}"),
        exchange: "",
        routingKey: "test"
    )
}
```

--------------------------------

### Mixed Recovery Patterns (Safe Channel + Retry) in Swift

Source: https://github.com/funcmike/rabbitmq-nio/blob/main/README.md

Combines the safe channel pattern with a retry mechanism to handle channel closure errors. It attempts to reuse the channel and re-establishes it if a `channelClosed` error is encountered.

```swift
let eventLoopGroup = MultiThreadedEventLoopGroup(numberOfThreads: 1)
let connection = SimpleSafeConnection(eventLoop: eventLoopGroup.next(), config: .init(connection: .plain, server: .init()))
var channel = try await connection.reuseChannel()

for _ in 0..<3 {
    do {
        let deliveryTag = try await channel.basicPublish(
            from: ByteBuffer(string: "{}"),
            exchange: "",
            routingKey: "test"
        )
        break
    } catch AMQPConnectionError.channelClosed {
        channel = try await connection.reuseChannel()
    } catch {
        print("Unknown problem", error)
    }
}
```

--------------------------------

### Set Quality of Service (QOS) Limit

Source: https://github.com/funcmike/rabbitmq-nio/blob/main/README.md

Sets a Quality of Service (QOS) limit for message prefetching on the channel. This helps prevent memory overflow on the consumer by limiting the number of unacknowledged messages.

```swift
try await channel.basicQos(count: 1000)
```

--------------------------------

### Declare AMQP Queue

Source: https://github.com/funcmike/rabbitmq-nio/blob/main/README.md

Declares a queue on the AMQP broker. This operation can specify queue properties like durability. If the queue already exists, it will not be recreated. Errors during declaration are handled.

```swift
do {
    try await channel.queueDeclare(name: "test", durable: false)

    print("Succesfully created queue")
} catch {
    print("Error while creating queue", error)
}
```

--------------------------------

### Close AMQP Channel and Connection

Source: https://github.com/funcmike/rabbitmq-nio/blob/main/README.md

Gracefully closes the AMQP channel and the underlying connection to the broker. This ensures that all resources are released properly. Errors encountered during the closing process are handled.

```swift
do {
    try await channel.close()
    try await connection.close()

    print("Succesfully closed", msg)
} catch {
    print("Error while closing", error)
}
```

--------------------------------

### Manually Cancel Consumer

Source: https://github.com/funcmike/rabbitmq-nio/blob/main/README.md

Allows for manual cancellation of an active message consumer using its unique consumer tag. This is an alternative to relying on automatic cancellation during deinitialization.

```swift
try await channel.basicCancel(consumerTag: consumer.name)
```

--------------------------------

### Consume Multiple Messages as AsyncThrowingStream

Source: https://github.com/funcmike/rabbitmq-nio/blob/main/README.md

Consumes messages from a queue as an asynchronous stream. This allows for continuous message processing. The consumer is automatically cancelled upon deinitialization or can be manually cancelled using its tag.

```swift
do {
    let consumer = try await channel.basicConsume(queue: "test")

    for try await msg in consumer {
        print("Succesfully consumed a message", msg)
        break
    }
} catch {
    print("Delivery failure", error)
}
```

--------------------------------

### Consume Single Message

Source: https://github.com/funcmike/rabbitmq-nio/blob/main/README.md

Retrieves a single message from a specified queue. If no message is available, it returns nil. This is a non-blocking operation that returns the message or indicates its absence. Errors during consumption are handled.

```swift
do {
    guard let msg = try await channel.basicGet(queue: "test") else {
        print("No message currently available")
        return
    }

    print("Succesfully consumed a message", msg)
} catch {
    print("Error while consuming a message", error)
}
```

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