7e5abd504f
Add three DBOS SDK skills with reference documentation for building reliable, fault-tolerant applications with durable workflows. Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
54 lines
1.4 KiB
Markdown
54 lines
1.4 KiB
Markdown
---
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title: Use Queues for Concurrent Workflows
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impact: HIGH
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impactDescription: Queues provide managed concurrency and flow control
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tags: queue, concurrency, enqueue, workflow
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---
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## Use Queues for Concurrent Workflows
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Queues run many workflows concurrently with managed flow control. Use them when you need to control how many workflows run at once.
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**Incorrect (uncontrolled concurrency):**
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```go
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// Starting many workflows without control - could overwhelm resources
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for _, task := range tasks {
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dbos.RunWorkflow(ctx, processTask, task)
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}
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```
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**Correct (using a queue):**
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```go
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// Create queue before Launch()
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queue := dbos.NewWorkflowQueue(ctx, "task_queue")
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func processAllTasks(ctx dbos.DBOSContext, tasks []string) ([]string, error) {
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var handles []dbos.WorkflowHandle[string]
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for _, task := range tasks {
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handle, err := dbos.RunWorkflow(ctx, processTask, task,
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dbos.WithQueue(queue.Name),
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)
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if err != nil {
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return nil, err
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}
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handles = append(handles, handle)
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}
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// Wait for all tasks
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var results []string
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for _, h := range handles {
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result, err := h.GetResult()
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if err != nil {
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return nil, err
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}
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results = append(results, result)
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}
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return results, nil
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}
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```
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Queues process workflows in FIFO order. All queues must be created with `dbos.NewWorkflowQueue` before `Launch()`.
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Reference: [DBOS Queues](https://docs.dbos.dev/golang/tutorials/queue-tutorial)
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