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