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111 lines
2.9 KiB
Go
111 lines
2.9 KiB
Go
package queue
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import (
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"context"
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"errors"
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)
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var (
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// ErrCancel indicates the task was cancelled.
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ErrCancel = errors.New("queue: task cancelled")
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// ErrNotFound indicates the task was not found in the queue.
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ErrNotFound = errors.New("queue: task not found")
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)
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// Task defines a unit of work in the queue.
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type Task struct {
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// ID identifies this task.
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ID string `json:"id,omitempty"`
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// Data is the actual data in the entry.
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Data []byte `json:"data"`
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// Labels represents the key-value pairs the entry is lebeled with.
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Labels map[string]string `json:"labels,omitempty"`
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}
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// InfoT provides runtime information.
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type InfoT struct {
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Pending []*Task `json:"pending"`
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Running []*Task `json:"running"`
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Stats struct {
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Workers int `json:"worker_count"`
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Pending int `json:"pending_count"`
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Running int `json:"running_count"`
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Complete int `json:"completed_count"`
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} `json:"stats"`
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}
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// Filter filters tasks in the queue. If the Filter returns false,
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// the Task is skipped and not returned to the subscriber.
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type Filter func(*Task) bool
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// Queue defines a task queue for scheduling tasks among
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// a pool of workers.
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type Queue interface {
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// Push pushes an task to the tail of this queue.
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Push(c context.Context, task *Task) error
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// Poll retrieves and removes a task head of this queue.
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Poll(c context.Context, f Filter) (*Task, error)
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// Extend extends the deadline for a task.
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Extend(c context.Context, id string) error
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// Done signals the task is complete.
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Done(c context.Context, id string) error
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// Error signals the task is complete with errors.
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Error(c context.Context, id string, err error) error
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// Wait waits until the task is complete.
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Wait(c context.Context, id string) error
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// Info returns internal queue information.
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Info(c context.Context) InfoT
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}
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// // global instance of the queue.
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// var global = New()
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//
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// // Set sets the global queue.
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// func Set(queue Queue) {
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// global = queue
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// }
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//
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// // Push pushes an task to the tail of the global queue.
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// func Push(c context.Context, task *Task) error {
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// return global.Push(c, task)
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// }
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//
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// // Poll retrieves and removes a task head of the global queue.
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// func Poll(c context.Context, f Filter) (*Task, error) {
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// return global.Poll(c, f)
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// }
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//
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// // Extend extends the deadline for a task.
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// func Extend(c context.Context, id string) error {
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// return global.Extend(c, id)
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// }
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//
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// // Done signals the task is complete.
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// func Done(c context.Context, id string) error {
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// return global.Done(c, id)
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// }
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//
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// // Error signals the task is complete with errors.
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// func Error(c context.Context, id string, err error) {
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// global.Error(c, id, err)
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// }
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//
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// // Wait waits until the task is complete.
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// func Wait(c context.Context, id string) error {
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// return global.Wait(c, id)
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// }
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//
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// // Info returns internal queue information.
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// func Info(c context.Context) InfoT {
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// return global.Info(c)
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// }
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