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- // Copyright 2019 The Gitea Authors. All rights reserved.
- // Use of this source code is governed by a MIT-style
- // license that can be found in the LICENSE file.
-
- package queue
-
- import (
- "gitea.com/lunny/levelqueue"
- )
-
- // LevelQueueType is the type for level queue
- const LevelQueueType Type = "level"
-
- // LevelQueueConfiguration is the configuration for a LevelQueue
- type LevelQueueConfiguration struct {
- ByteFIFOQueueConfiguration
- DataDir string
- }
-
- // LevelQueue implements a disk library queue
- type LevelQueue struct {
- *ByteFIFOQueue
- }
-
- // NewLevelQueue creates a ledis local queue
- func NewLevelQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, error) {
- configInterface, err := toConfig(LevelQueueConfiguration{}, cfg)
- if err != nil {
- return nil, err
- }
- config := configInterface.(LevelQueueConfiguration)
-
- byteFIFO, err := NewLevelQueueByteFIFO(config.DataDir)
- if err != nil {
- return nil, err
- }
-
- byteFIFOQueue, err := NewByteFIFOQueue(LevelQueueType, byteFIFO, handle, config.ByteFIFOQueueConfiguration, exemplar)
- if err != nil {
- return nil, err
- }
-
- queue := &LevelQueue{
- ByteFIFOQueue: byteFIFOQueue,
- }
- queue.qid = GetManager().Add(queue, LevelQueueType, config, exemplar)
- return queue, nil
- }
-
- var _ (ByteFIFO) = &LevelQueueByteFIFO{}
-
- // LevelQueueByteFIFO represents a ByteFIFO formed from a LevelQueue
- type LevelQueueByteFIFO struct {
- internal *levelqueue.Queue
- }
-
- // NewLevelQueueByteFIFO creates a ByteFIFO formed from a LevelQueue
- func NewLevelQueueByteFIFO(dataDir string) (*LevelQueueByteFIFO, error) {
- internal, err := levelqueue.Open(dataDir)
- if err != nil {
- return nil, err
- }
-
- return &LevelQueueByteFIFO{
- internal: internal,
- }, nil
- }
-
- // PushFunc will push data into the fifo
- func (fifo *LevelQueueByteFIFO) PushFunc(data []byte, fn func() error) error {
- if fn != nil {
- if err := fn(); err != nil {
- return err
- }
- }
- return fifo.internal.LPush(data)
- }
-
- // Pop pops data from the start of the fifo
- func (fifo *LevelQueueByteFIFO) Pop() ([]byte, error) {
- data, err := fifo.internal.RPop()
- if err != nil && err != levelqueue.ErrNotFound {
- return nil, err
- }
- return data, nil
- }
-
- // Close this fifo
- func (fifo *LevelQueueByteFIFO) Close() error {
- return fifo.internal.Close()
- }
-
- // Len returns the length of the fifo
- func (fifo *LevelQueueByteFIFO) Len() int64 {
- return fifo.internal.Len()
- }
-
- func init() {
- queuesMap[LevelQueueType] = NewLevelQueue
- }
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