1 files changed, 106 insertions, 0 deletions
diff --git a/modules/queue/queue_channel.go b/modules/queue/queue_channel.go
new file mode 100644
index 0000000000..c8f8a53804
--- /dev/null
+++ b/modules/queue/queue_channel.go
@@ -0,0 +1,106 @@
+// 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 (
+	"context"
+	"fmt"
+	"reflect"
+	"time"
+
+	"code.gitea.io/gitea/modules/log"
+)
+
+// ChannelQueueType is the type for channel queue
+const ChannelQueueType Type = "channel"
+
+// ChannelQueueConfiguration is the configuration for a ChannelQueue
+type ChannelQueueConfiguration struct {
+	QueueLength  int
+	BatchLength  int
+	Workers      int
+	MaxWorkers   int
+	BlockTimeout time.Duration
+	BoostTimeout time.Duration
+	BoostWorkers int
+	Name         string
+}
+
+// ChannelQueue implements
+type ChannelQueue struct {
+	pool     *WorkerPool
+	exemplar interface{}
+	workers  int
+	name     string
+}
+
+// NewChannelQueue create a memory channel queue
+func NewChannelQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, error) {
+	configInterface, err := toConfig(ChannelQueueConfiguration{}, cfg)
+	if err != nil {
+		return nil, err
+	}
+	config := configInterface.(ChannelQueueConfiguration)
+	if config.BatchLength == 0 {
+		config.BatchLength = 1
+	}
+	dataChan := make(chan Data, config.QueueLength)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	queue := &ChannelQueue{
+		pool: &WorkerPool{
+			baseCtx:            ctx,
+			cancel:             cancel,
+			batchLength:        config.BatchLength,
+			handle:             handle,
+			dataChan:           dataChan,
+			blockTimeout:       config.BlockTimeout,
+			boostTimeout:       config.BoostTimeout,
+			boostWorkers:       config.BoostWorkers,
+			maxNumberOfWorkers: config.MaxWorkers,
+		},
+		exemplar: exemplar,
+		workers:  config.Workers,
+		name:     config.Name,
+	}
+	queue.pool.qid = GetManager().Add(queue, ChannelQueueType, config, exemplar, queue.pool)
+	return queue, nil
+}
+
+// Run starts to run the queue
+func (c *ChannelQueue) Run(atShutdown, atTerminate func(context.Context, func())) {
+	atShutdown(context.Background(), func() {
+		log.Warn("ChannelQueue: %s is not shutdownable!", c.name)
+	})
+	atTerminate(context.Background(), func() {
+		log.Warn("ChannelQueue: %s is not terminatable!", c.name)
+	})
+	go func() {
+		_ = c.pool.AddWorkers(c.workers, 0)
+	}()
+}
+
+// Push will push data into the queue
+func (c *ChannelQueue) Push(data Data) error {
+	if c.exemplar != nil {
+		// Assert data is of same type as r.exemplar
+		t := reflect.TypeOf(data)
+		exemplarType := reflect.TypeOf(c.exemplar)
+		if !t.AssignableTo(exemplarType) || data == nil {
+			return fmt.Errorf("Unable to assign data: %v to same type as exemplar: %v in queue: %s", data, c.exemplar, c.name)
+		}
+	}
+	c.pool.Push(data)
+	return nil
+}
+
+// Name returns the name of this queue
+func (c *ChannelQueue) Name() string {
+	return c.name
+}
+
+func init() {
+	queuesMap[ChannelQueueType] = NewChannelQueue
+}