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Overview ¶
Package queue provides implementations of server-side queues.
Index ¶
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type Manager ¶
type Manager struct {
// contains filtered or unexported fields
}
Queue manager.
func NewManager ¶
Create a queue manager with the specified queue storage mechanism
type MemoryQueueStorage ¶
type MemoryQueueStorage struct {
// contains filtered or unexported fields
}
In-memory implementation of the QueueStorage interface.
func (*MemoryQueueStorage) Dequeue ¶
func (m *MemoryQueueStorage) Dequeue(queue string) (*frame.Frame, error)
Removes a frame from the head of the queue. Returns nil if no frame is available.
func (*MemoryQueueStorage) Enqueue ¶
func (m *MemoryQueueStorage) Enqueue(queue string, frame *frame.Frame) error
func (*MemoryQueueStorage) Requeue ¶
func (m *MemoryQueueStorage) Requeue(queue string, frame *frame.Frame) error
Pushes a frame to the head of the queue. Sets the "message-id" header of the frame if it is not already set.
func (*MemoryQueueStorage) Start ¶
func (m *MemoryQueueStorage) Start()
Called at server startup. Allows the queue storage to perform any initialization.
func (*MemoryQueueStorage) Stop ¶
func (m *MemoryQueueStorage) Stop()
Called prior to server shutdown. Allows the queue storage to perform any cleanup.
type Queue ¶
type Queue struct {
// contains filtered or unexported fields
}
Queue for storing message frames.
func (*Queue) Enqueue ¶
Send a message to the queue. If a subscription is available to receive the message, it is sent to the subscription without making it to the queue. Otherwise, the message is queued until a message is available.
func (*Queue) Requeue ¶
Send a message to the front of the queue, probably because it failed to be sent to a client. If a subscription is available to receive the message, it is sent to the subscription without making it to the queue. Otherwise, the message is queued until a message is available.
func (*Queue) Subscribe ¶
func (q *Queue) Subscribe(sub *client.Subscription) error
Add a subscription to a queue. The subscription is removed whenever a frame is sent to the subscription and needs to be re-added when the subscription decides that the message has been received by the client.
func (*Queue) Unsubscribe ¶
func (q *Queue) Unsubscribe(sub *client.Subscription)
Unsubscribe a subscription.
type Storage ¶
type Storage interface {
// Pushes a MESSAGE frame to the end of the queue. Sets
// the "message-id" header of the frame before adding to
// the queue.
Enqueue(queue string, frame *frame.Frame) error
// Pushes a MESSAGE frame to the head of the queue. Sets
// the "message-id" header of the frame if it is not
// already set.
Requeue(queue string, frame *frame.Frame) error
// Removes a frame from the head of the queue.
// Returns nil if no frame is available.
Dequeue(queue string) (*frame.Frame, error)
// Called at server startup. Allows the queue storage
// to perform any initialization.
Start()
// Called prior to server shutdown. Allows the queue storage
// to perform any cleanup.
Stop()
}
Interface for queue storage. The intent is that different queue storage implementations can be used, depending on preference. Queue storage mechanisms could include in-memory, and various persistent storage mechanisms (eg file system, DB, etc)
func NewMemoryQueueStorage ¶
func NewMemoryQueueStorage() Storage
Source Files