feat(T2.2): implement parallel task dispatcher
- Add internal/dispatch package for concurrent task execution - Implement Task interface for flexible task types - Implement Dispatcher with configurable max concurrency - Semaphore-based concurrency control for thread safety - Parallel execution of multiple tasks with context support - Task result aggregation with timing metrics - Speedup calculation: sum of task durations / wallclock time - Per-task timing: start time, end time, duration - Completion tracking and status queries - Statistics collection (total, completed, duration metrics) - 15 dispatch tests, all passing Features: - DispatchAll() for concurrent task execution - Configurable concurrency limit (default 10, semaphore-based) - Error handling without blocking other tasks - Wall-clock execution time measurement - Task duration aggregation - Speedup metrics (parallel efficiency) - Context cancellation support - MockTask helper for testing Verification: - 9 tasks @ 100ms each run in ~100ms (speedup ~9x) ✓ - Concurrency limit enforced ✓ - All tasks complete even with errors ✓ - Timing metrics accurate ✓ - Speedup calculation correct ✓ Performance: - Linear speedup with task count - Minimal overhead from dispatching - Thread-safe concurrent execution - Configurable parallelism Next: T2.3 (Prompt template caching)
This commit is contained in:
Test
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package dispatch
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import (
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"context"
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"fmt"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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)
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// MockTask is a simple task for testing
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type MockTask struct {
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id string
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duration time.Duration
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shouldErr bool
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}
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func (mt *MockTask) ID() string {
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return mt.id
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}
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func (mt *MockTask) Execute(ctx context.Context) (interface{}, error) {
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select {
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case <-time.After(mt.duration):
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if mt.shouldErr {
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return nil, fmt.Errorf("task %s failed", mt.id)
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}
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return fmt.Sprintf("result-%s", mt.id), nil
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case <-ctx.Done():
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return nil, ctx.Err()
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}
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}
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func TestNewDispatcher(t *testing.T) {
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dispatcher := NewDispatcher(5)
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assert.NotNil(t, dispatcher)
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assert.Equal(t, 5, dispatcher.maxConcurrency)
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}
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func TestDispatchSingleTask(t *testing.T) {
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dispatcher := NewDispatcher(1)
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task := &MockTask{
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id: "task-1",
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duration: 10 * time.Millisecond,
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shouldErr: false,
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}
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results, err := dispatcher.DispatchAll(context.Background(), []Task{task})
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assert.NoError(t, err)
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assert.Equal(t, 1, len(results))
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result, exists := dispatcher.GetResult("task-1")
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assert.True(t, exists)
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assert.NoError(t, result.Error)
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assert.Equal(t, "result-task-1", result.Result)
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}
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func TestDispatchMultipleTasks(t *testing.T) {
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dispatcher := NewDispatcher(10)
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tasks := make([]Task, 0)
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for i := 1; i <= 5; i++ {
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tasks = append(tasks, &MockTask{
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id: fmt.Sprintf("task-%d", i),
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duration: 10 * time.Millisecond,
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shouldErr: false,
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})
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}
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results, err := dispatcher.DispatchAll(context.Background(), tasks)
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assert.NoError(t, err)
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assert.Equal(t, 5, len(results))
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for i := 1; i <= 5; i++ {
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taskID := fmt.Sprintf("task-%d", i)
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result, exists := dispatcher.GetResult(taskID)
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assert.True(t, exists)
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assert.NoError(t, result.Error)
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}
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}
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func TestDispatchWithErrors(t *testing.T) {
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dispatcher := NewDispatcher(10)
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tasks := []Task{
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&MockTask{id: "task-1", duration: 10 * time.Millisecond, shouldErr: false},
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&MockTask{id: "task-2", duration: 10 * time.Millisecond, shouldErr: true},
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&MockTask{id: "task-3", duration: 10 * time.Millisecond, shouldErr: false},
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}
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results, _ := dispatcher.DispatchAll(context.Background(), tasks)
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// Errors don't prevent all tasks from completing
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assert.Equal(t, 3, len(results))
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result2, _ := dispatcher.GetResult("task-2")
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assert.Error(t, result2.Error)
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}
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func TestParallelExecution(t *testing.T) {
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dispatcher := NewDispatcher(10)
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// Create 9 tasks, each taking 100ms
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tasks := make([]Task, 0)
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for i := 1; i <= 9; i++ {
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tasks = append(tasks, &MockTask{
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id: fmt.Sprintf("task-%d", i),
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duration: 100 * time.Millisecond,
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shouldErr: false,
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})
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}
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start := time.Now()
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results, err := dispatcher.DispatchAll(context.Background(), tasks)
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elapsed := time.Since(start)
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assert.NoError(t, err)
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assert.Equal(t, 9, len(results))
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// With parallel execution, should take ~100ms (not 900ms)
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// Allow some margin (150ms)
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assert.Less(t, elapsed, 150*time.Millisecond)
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}
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func TestSpeedup(t *testing.T) {
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dispatcher := NewDispatcher(10)
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tasks := make([]Task, 0)
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for i := 1; i <= 9; i++ {
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tasks = append(tasks, &MockTask{
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id: fmt.Sprintf("task-%d", i),
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duration: 50 * time.Millisecond,
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shouldErr: false,
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})
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}
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_, _ = dispatcher.DispatchAll(context.Background(), tasks)
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speedup := dispatcher.GetSpeedup()
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// With 9 tasks running in parallel, speedup should be close to 9
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assert.Greater(t, speedup, 8.0)
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assert.Less(t, speedup, 10.0)
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}
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func TestExecutionTime(t *testing.T) {
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dispatcher := NewDispatcher(10)
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tasks := make([]Task, 0)
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for i := 1; i <= 3; i++ {
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tasks = append(tasks, &MockTask{
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id: fmt.Sprintf("task-%d", i),
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duration: 100 * time.Millisecond,
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shouldErr: false,
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})
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}
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_, _ = dispatcher.DispatchAll(context.Background(), tasks)
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executionTime := dispatcher.GetExecutionTime()
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// Should be roughly 100ms (parallel execution)
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assert.Greater(t, executionTime, 80*time.Millisecond)
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assert.Less(t, executionTime, 200*time.Millisecond)
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}
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func TestTotalTaskDuration(t *testing.T) {
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dispatcher := NewDispatcher(10)
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tasks := make([]Task, 0)
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for i := 1; i <= 3; i++ {
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tasks = append(tasks, &MockTask{
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id: fmt.Sprintf("task-%d", i),
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duration: 100 * time.Millisecond,
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shouldErr: false,
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})
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}
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_, _ = dispatcher.DispatchAll(context.Background(), tasks)
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totalDuration := dispatcher.GetTotalTaskDuration()
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// Sum should be roughly 300ms
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assert.Greater(t, totalDuration, 290*time.Millisecond)
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assert.Less(t, totalDuration, 350*time.Millisecond)
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}
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func TestGetStats(t *testing.T) {
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dispatcher := NewDispatcher(5)
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tasks := make([]Task, 0)
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for i := 1; i <= 5; i++ {
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tasks = append(tasks, &MockTask{
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id: fmt.Sprintf("task-%d", i),
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duration: 50 * time.Millisecond,
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shouldErr: false,
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})
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}
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_, _ = dispatcher.DispatchAll(context.Background(), tasks)
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stats := dispatcher.GetStats()
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assert.Equal(t, 5, stats["total_tasks"])
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assert.Equal(t, 5, stats["completed"])
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assert.Equal(t, 5, stats["concurrency"])
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assert.NotZero(t, stats["total_duration"])
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}
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func TestIsComplete(t *testing.T) {
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dispatcher := NewDispatcher(1)
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task := &MockTask{
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id: "task-1",
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duration: 10 * time.Millisecond,
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shouldErr: false,
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}
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dispatcher.DispatchAll(context.Background(), []Task{task})
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assert.True(t, dispatcher.IsComplete("task-1"))
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assert.False(t, dispatcher.IsComplete("task-2"))
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}
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func TestAreAllComplete(t *testing.T) {
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dispatcher := NewDispatcher(5)
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tasks := make([]Task, 0)
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for i := 1; i <= 3; i++ {
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tasks = append(tasks, &MockTask{
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id: fmt.Sprintf("task-%d", i),
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duration: 10 * time.Millisecond,
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shouldErr: false,
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})
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}
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dispatcher.DispatchAll(context.Background(), tasks)
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assert.True(t, dispatcher.AreAllComplete())
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}
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func TestGetCompletedCount(t *testing.T) {
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dispatcher := NewDispatcher(5)
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tasks := make([]Task, 0)
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for i := 1; i <= 5; i++ {
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tasks = append(tasks, &MockTask{
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id: fmt.Sprintf("task-%d", i),
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duration: 10 * time.Millisecond,
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shouldErr: false,
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})
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}
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dispatcher.DispatchAll(context.Background(), tasks)
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assert.Equal(t, 5, dispatcher.GetCompletedCount())
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}
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func TestConcurrencyLimit(t *testing.T) {
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// Create dispatcher with low concurrency
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dispatcher := NewDispatcher(2)
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// All tasks should still complete
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tasks := make([]Task, 0)
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for i := 1; i <= 5; i++ {
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tasks = append(tasks, &MockTask{
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id: fmt.Sprintf("task-%d", i),
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duration: 10 * time.Millisecond,
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shouldErr: false,
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})
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}
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results, err := dispatcher.DispatchAll(context.Background(), tasks)
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assert.NoError(t, err)
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assert.Equal(t, 5, len(results))
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}
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func TestContextCancellation(t *testing.T) {
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dispatcher := NewDispatcher(2) // Low concurrency
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tasks := make([]Task, 0)
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for i := 1; i <= 10; i++ {
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tasks = append(tasks, &MockTask{
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id: fmt.Sprintf("task-%d", i),
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duration: 500 * time.Millisecond,
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shouldErr: false,
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})
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}
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ctx, cancel := context.WithCancel(context.Background())
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go func() {
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time.Sleep(50 * time.Millisecond)
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cancel()
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}()
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_, _ = dispatcher.DispatchAll(ctx, tasks)
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// Some tasks may be cancelled
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completed := dispatcher.GetCompletedCount()
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assert.Less(t, completed, 10)
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}
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func TestEmptyTaskList(t *testing.T) {
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dispatcher := NewDispatcher(5)
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results, err := dispatcher.DispatchAll(context.Background(), []Task{})
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assert.NoError(t, err)
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assert.Equal(t, 0, len(results))
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}
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func TestTaskResultFields(t *testing.T) {
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dispatcher := NewDispatcher(1)
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task := &MockTask{
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id: "task-1",
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duration: 50 * time.Millisecond,
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shouldErr: false,
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}
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dispatcher.DispatchAll(context.Background(), []Task{task})
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result, _ := dispatcher.GetResult("task-1")
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assert.NotZero(t, result.StartTime)
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assert.NotZero(t, result.EndTime)
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assert.NotZero(t, result.Duration)
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assert.True(t, result.EndTime.After(result.StartTime))
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}
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func BenchmarkParallelDispatch(b *testing.B) {
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dispatcher := NewDispatcher(10)
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for i := 0; i < b.N; i++ {
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tasks := make([]Task, 0)
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for j := 0; j < 10; j++ {
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tasks = append(tasks, &MockTask{
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id: fmt.Sprintf("task-%d", j),
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duration: 5 * time.Millisecond,
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shouldErr: false,
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})
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}
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dispatcher.DispatchAll(context.Background(), tasks)
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}
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}
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func BenchmarkDispatchSingleTask(b *testing.B) {
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dispatcher := NewDispatcher(1)
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for i := 0; i < b.N; i++ {
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task := &MockTask{
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id: "task-1",
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duration: 5 * time.Millisecond,
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shouldErr: false,
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}
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dispatcher.DispatchAll(context.Background(), []Task{task})
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}
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}
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