// TestPrefilledMeta tests that WorkSpec.Meta() fills in correctly from
// "magic" keys in a work spec.
func (s *Suite) TestPrefilledMeta(c *check.C) {
	var (
		err  error
		spec coordinate.WorkSpec
		meta coordinate.WorkSpecMeta
	)
	spec, err = s.Namespace.SetWorkSpec(map[string]interface{}{
		"name":        "spec",
		"min_gb":      1,
		"priority":    10,
		"weight":      100,
		"disabled":    true,
		"continuous":  true,
		"interval":    60,
		"max_running": 10,
		"max_getwork": 1,
		"then":        "spec2",
	})
	c.Assert(err, check.IsNil)

	meta, err = spec.Meta(false)
	c.Assert(err, check.IsNil)
	c.Check(meta.Priority, check.Equals, 10)
	c.Check(meta.Weight, check.Equals, 100)
	c.Check(meta.Paused, check.Equals, true)
	c.Check(meta.Continuous, check.Equals, true)
	c.Check(meta.CanBeContinuous, check.Equals, true)
	c.Check(meta.Interval, check.Equals, time.Duration(60)*time.Second)
	c.Check(meta.NextContinuous, check.Equals, time.Time{})
	c.Check(meta.MaxRunning, check.Equals, 10)
	c.Check(meta.MaxAttemptsReturned, check.Equals, 1)
	c.Check(meta.NextWorkSpecName, check.Equals, "spec2")
	c.Check(meta.AvailableCount, check.Equals, 0)
	c.Check(meta.PendingCount, check.Equals, 0)
}

// TestDefaultMeta tests that WorkSpec.Meta gets the correct defaults,
// which in a couple of cases are not zero values.
func (s *Suite) TestDefaultMeta(c *check.C) {
	var (
		err  error
		spec coordinate.WorkSpec
		meta coordinate.WorkSpecMeta
	)
	spec, err = s.Namespace.SetWorkSpec(map[string]interface{}{
		"name":   "spec",
		"min_gb": 1,
	})
	c.Assert(err, check.IsNil)

	meta, err = spec.Meta(false)
	c.Assert(err, check.IsNil)
	c.Check(meta.Priority, check.Equals, 0)
	c.Check(meta.Weight, check.Equals, 20)
	c.Check(meta.Paused, check.Equals, false)
	c.Check(meta.Continuous, check.Equals, false)
	c.Check(meta.CanBeContinuous, check.Equals, false)
	c.Check(meta.Interval, check.Equals, time.Duration(0))
	c.Check(meta.NextContinuous, check.Equals, time.Time{})
	c.Check(meta.MaxRunning, check.Equals, 0)
	c.Check(meta.MaxAttemptsReturned, check.Equals, 0)
	c.Check(meta.NextWorkSpecName, check.Equals, "")
	c.Check(meta.AvailableCount, check.Equals, 0)
	c.Check(meta.PendingCount, check.Equals, 0)
}

// PrioritizeWorkUnits changes the priorities of some number of work
// units.  The actual work units are in options["work_unit_keys"].  A
// higher priority results in the work units being scheduled sooner.
func (jobs *JobServer) PrioritizeWorkUnits(workSpecName string, options map[string]interface{}) (bool, string, error) {
	var (
		err      error
		query    coordinate.WorkUnitQuery
		workSpec coordinate.WorkSpec
	)
	pwuOptions := PrioritizeWorkUnitsOptions{
		Priority:   math.NaN(),
		Adjustment: math.NaN(),
	}
	workSpec, err = jobs.Namespace.WorkSpec(workSpecName)
	if err == nil {
		err = decode(&pwuOptions, options)
	}
	if err == nil && pwuOptions.WorkUnitKeys == nil {
		return false, "missing work_unit_keys", err
	}
	if err == nil {
		query.Names = pwuOptions.WorkUnitKeys
		if !math.IsNaN(pwuOptions.Priority) {
			err = workSpec.SetWorkUnitPriorities(query, pwuOptions.Priority)
		} else if !math.IsNaN(pwuOptions.Adjustment) {
			err = workSpec.AdjustWorkUnitPriorities(query, pwuOptions.Adjustment)
		}
	}
	return err == nil, "", err
}

// ControlWorkSpec makes changes to a work spec that are not directly
// reflected in the work spec definition.  This allows work specs to
// be paused or to stop generating new continuous jobs.
// ControlWorkSpecOptions has a complete listing of what can be done.
func (jobs *JobServer) ControlWorkSpec(workSpecName string, options map[string]interface{}) (bool, string, error) {
	var (
		cwsOptions ControlWorkSpecOptions
		decoder    *mapstructure.Decoder
		err        error
		metadata   mapstructure.Metadata
		workSpec   coordinate.WorkSpec
		wsMeta     coordinate.WorkSpecMeta
	)

	workSpec, err = jobs.Namespace.WorkSpec(workSpecName)
	if err == nil {
		// We care a lot about "false" vs. not present for
		// these things.  Manually create the decoder.
		config := mapstructure.DecoderConfig{
			Result:   &cwsOptions,
			Metadata: &metadata,
		}
		decoder, err = mapstructure.NewDecoder(&config)
	}
	if err == nil {
		err = decoder.Decode(options)
	}

	// Get the existing metadata, then change it based on what
	// we got provided
	if err == nil {
		wsMeta, err = workSpec.Meta(false)
	}
	if err == nil {
		for _, key := range metadata.Keys {
			switch key {
			case "Continuous":
				wsMeta.Continuous = cwsOptions.Continuous
			case "Status":
				wsMeta.Paused = cwsOptions.Status == Paused
			case "Weight":
				wsMeta.Weight = cwsOptions.Weight
			case "Interval":
				wsMeta.Interval = time.Duration(cwsOptions.Interval) * time.Second
			case "MaxRunning":
				wsMeta.MaxRunning = cwsOptions.MaxRunning
			}
		}
	}
	if err == nil {
		err = workSpec.SetMeta(wsMeta)
	}
	return err == nil, "", err
}

// TestMetaContinuous specifically checks that you cannot enable the
// "continuous" flag on non-continuous work specs.
func (s *Suite) TestMetaContinuous(c *check.C) {
	var (
		err  error
		spec coordinate.WorkSpec
		meta coordinate.WorkSpecMeta
	)

	// ...also...
	spec, err = s.Namespace.SetWorkSpec(map[string]interface{}{
		"name":   "spec",
		"min_gb": 1,
	})
	c.Assert(err, check.IsNil)

	meta, err = spec.Meta(false)
	c.Assert(err, check.IsNil)
	c.Check(meta.Continuous, check.Equals, false)
	c.Check(meta.CanBeContinuous, check.Equals, false)

	meta.Continuous = true
	err = spec.SetMeta(meta)
	c.Assert(err, check.IsNil)

	meta, err = spec.Meta(false)
	c.Assert(err, check.IsNil)
	// Cannot set the "continuous" flag
	c.Check(meta.Continuous, check.Equals, false)
	c.Check(meta.CanBeContinuous, check.Equals, false)
}

// makeWorkUnits creates a handful of work units within a work spec.
// These have keys "available", "pending", "finished", "failed",
// "expired", and "retryable", and wind up in the corresponding
// states.
func makeWorkUnits(spec coordinate.WorkSpec, worker coordinate.Worker) (map[string]coordinate.WorkUnit, error) {
	result := map[string]coordinate.WorkUnit{
		"available": nil,
		"pending":   nil,
		"finished":  nil,
		"failed":    nil,
		"expired":   nil,
		"retryable": nil,
	}
	for key := range result {
		unit, err := spec.AddWorkUnit(key, map[string]interface{}{}, 0)
		if err != nil {
			return nil, err
		}
		result[key] = unit

		// Run the workflow
		if key == "available" {
			continue
		}
		attempt, err := worker.MakeAttempt(unit, time.Duration(0))
		if err != nil {
			return nil, err
		}
		switch key {
		case "pending":
			{
			} // leave it running
		case "finished":
			err = attempt.Finish(nil)
		case "failed":
			err = attempt.Fail(nil)
		case "expired":
			err = attempt.Expire(nil)
		case "retryable":
			err = attempt.Retry(nil)
		}
		if err != nil {
			return nil, err
		}
	}
	return result, nil
}

func getWorkSpecData(spec coordinate.WorkSpec) (map[string]interface{}, error) {
	data, err := spec.Data()
	if err != nil {
		return nil, err
	}
	byteify := func(key string) {
		value, present := data[key]
		if !present {
			return
		}
		string, ok := value.(string)
		if !ok {
			return
		}
		data[key] = []byte(string)
	}
	byteify("module")
	byteify("run_function")
	return data, nil
}

// TestSpecCreateDestroy performs basic work spec lifetime tests.
func (s *Suite) TestSpecCreateDestroy(c *check.C) {
	var (
		data  map[string]interface{}
		dict  map[string]interface{}
		spec  coordinate.WorkSpec
		name  string
		names []string
		err   error
	)
	name = "spec"

	spec, err = s.Namespace.WorkSpec(name)
	c.Check(err, check.DeepEquals,
		coordinate.ErrNoSuchWorkSpec{Name: name})

	names, err = s.Namespace.WorkSpecNames()
	c.Assert(err, check.IsNil)
	c.Check(names, check.HasLen, 0)

	dict = map[string]interface{}{
		"name":   name,
		"min_gb": 0.1,
	}
	spec, err = s.Namespace.SetWorkSpec(dict)
	c.Assert(err, check.IsNil)
	c.Check(spec, check.NotNil)
	c.Check(spec.Name(), check.Equals, name)

	spec, err = s.Namespace.WorkSpec(name)
	c.Assert(err, check.IsNil)
	c.Check(spec, check.NotNil)
	c.Check(spec.Name(), check.Equals, name)

	data, err = spec.Data()
	c.Assert(err, check.IsNil)
	c.Check(data, check.DeepEquals, dict)

	names, err = s.Namespace.WorkSpecNames()
	c.Assert(err, check.IsNil)
	c.Check(names, check.DeepEquals, []string{name})

	err = s.Namespace.DestroyWorkSpec(name)
	c.Check(err, check.IsNil)

	spec, err = s.Namespace.WorkSpec(name)
	c.Check(err, check.DeepEquals,
		coordinate.ErrNoSuchWorkSpec{Name: name})

	names, err = s.Namespace.WorkSpecNames()
	c.Assert(err, check.IsNil)
	c.Check(names, check.HasLen, 0)

	err = s.Namespace.DestroyWorkSpec(name)
	c.Check(err, check.DeepEquals,
		coordinate.ErrNoSuchWorkSpec{Name: name})
}

// checkWorkUnitOrder verifies that getting all of the work possible
// retrieves work units in a specific order.
func checkWorkUnitOrder(
	c *check.C,
	worker coordinate.Worker,
	spec coordinate.WorkSpec,
	unitNames ...string,
) {
	var processedUnits []string
	for {
		attempts, err := worker.RequestAttempts(coordinate.AttemptRequest{})
		c.Assert(err, check.IsNil)
		if len(attempts) == 0 {
			break
		}
		c.Assert(attempts, check.HasLen, 1)
		attempt := attempts[0]
		c.Check(attempt.WorkUnit().WorkSpec().Name(), check.Equals, spec.Name())
		processedUnits = append(processedUnits, attempt.WorkUnit().Name())
		err = attempt.Finish(nil)
		c.Assert(err, check.IsNil)
	}

	c.Check(processedUnits, check.DeepEquals, unitNames)
}

// GetWorkSpecMeta returns a set of control options for a given work
// spec.  The returned map has the full set of keys that
// ControlWorkSpec() will accept.
func (jobs *JobServer) GetWorkSpecMeta(workSpecName string) (result map[string]interface{}, _ string, err error) {
	var (
		workSpec coordinate.WorkSpec
		meta     coordinate.WorkSpecMeta
	)

	workSpec, err = jobs.Namespace.WorkSpec(workSpecName)
	if err == nil {
		meta, err = workSpec.Meta(false)
	}
	if err == nil {
		result = make(map[string]interface{})
		if meta.Paused {
			result["status"] = Paused
		} else {
			result["status"] = Runnable
		}
		result["continuous"] = meta.Continuous
		result["interval"] = meta.Interval.Seconds()
		result["max_running"] = meta.MaxRunning
		result["weight"] = meta.Weight
	}
	return
}

// TestChainingExpiry tests that, if an attempt finishes but is no
// longer the active attempt, then its successor work units will not
// be created.
func (s *Suite) TestChainingExpiry(c *check.C) {
	var (
		one, two coordinate.WorkSpec
		err      error
		worker   coordinate.Worker
		unit     coordinate.WorkUnit
		attempts []coordinate.Attempt
	)

	one, err = s.Namespace.SetWorkSpec(map[string]interface{}{
		"name": "one",
		"then": "two",
	})
	c.Assert(err, check.IsNil)

	two, err = s.Namespace.SetWorkSpec(map[string]interface{}{
		"name":     "two",
		"disabled": true,
	})
	c.Assert(err, check.IsNil)

	worker, err = s.Namespace.Worker("worker")
	c.Assert(err, check.IsNil)

	// Create and perform a work unit, with no output
	unit, err = one.AddWorkUnit("a", map[string]interface{}{}, 0.0)
	c.Assert(err, check.IsNil)

	attempts, err = worker.RequestAttempts(coordinate.AttemptRequest{})
	c.Assert(err, check.IsNil)
	c.Assert(attempts, check.HasLen, 1)
	attempt := attempts[0]

	// But wait!  We got preempted
	err = unit.ClearActiveAttempt()
	c.Assert(err, check.IsNil)
	attempts, err = worker.RequestAttempts(coordinate.AttemptRequest{})
	c.Assert(err, check.IsNil)
	c.Assert(attempts, check.HasLen, 1)

	// Now, let the original attempt finish, trying to generate
	// more outputs
	err = attempt.Finish(map[string]interface{}{
		"output": []string{"unit"},
	})
	c.Assert(err, check.IsNil)

	// Since attempt is no longer active, this shouldn't generate
	// new outputs
	units, err := two.WorkUnits(coordinate.WorkUnitQuery{})
	c.Assert(err, check.IsNil)
	c.Check(units, check.HasLen, 0)
}

// TestChangeSpecData tests WorkSpec.SetData().
func (s *Suite) TestChangeSpecData(c *check.C) {
	var (
		err  error
		data map[string]interface{}
		spec coordinate.WorkSpec
	)

	spec, err = s.Namespace.SetWorkSpec(map[string]interface{}{
		"name":   "spec",
		"min_gb": 1,
	})
	c.Assert(err, check.IsNil)
	c.Check(spec.Name(), check.Equals, "spec")

	err = spec.SetData(map[string]interface{}{
		"name":   "spec",
		"min_gb": 2,
		"foo":    "bar",
	})
	c.Assert(err, check.IsNil)

	data, err = spec.Data()
	c.Assert(err, check.IsNil)
	c.Check(data["name"], check.Equals, "spec")
	c.Check(data["min_gb"], Like, 2)
	c.Check(data["foo"], check.Equals, "bar")

	err = spec.SetData(map[string]interface{}{})
	c.Assert(err, check.NotNil)
	c.Check(err, check.Equals, coordinate.ErrNoWorkSpecName)

	err = spec.SetData(map[string]interface{}{
		"name":   "name",
		"min_gb": 3,
	})
	c.Assert(err, check.NotNil)
	c.Check(err, check.Equals, coordinate.ErrChangedName)

	data, err = spec.Data()
	c.Assert(err, check.IsNil)
	c.Check(data["name"], check.Equals, "spec")
	c.Check(data["min_gb"], Like, 2)
	c.Check(data["foo"], check.Equals, "bar")
}

// TestAttemptLifetime validates a basic attempt lifetime.
func (s *Suite) TestAttemptLifetime(c *check.C) {
	var (
		err               error
		data              map[string]interface{}
		attempt, attempt2 coordinate.Attempt
		aStatus           coordinate.AttemptStatus
		spec              coordinate.WorkSpec
		unit              coordinate.WorkUnit
		worker            coordinate.Worker
		uStatus           coordinate.WorkUnitStatus
	)
	spec, worker = s.makeWorkSpecAndWorker(c)

	// Create a work unit
	unit, err = spec.AddWorkUnit("a", map[string]interface{}{}, 0.0)
	c.Assert(err, check.IsNil)

	// The work unit should be "available"
	uStatus, err = unit.Status()
	c.Assert(err, check.IsNil)
	c.Check(uStatus, check.Equals, coordinate.AvailableUnit)

	// The work unit data should be defined but empty
	data, err = unit.Data()
	c.Assert(err, check.IsNil)
	c.Check(data, check.HasLen, 0)

	// Get an attempt for it
	attempts, err := worker.RequestAttempts(coordinate.AttemptRequest{})
	c.Assert(err, check.IsNil)
	c.Assert(attempts, check.HasLen, 1)
	attempt = attempts[0]

	// The work unit should be "pending"
	uStatus, err = unit.Status()
	c.Assert(err, check.IsNil)
	c.Check(uStatus, check.Equals, coordinate.PendingUnit)

	// The attempt should be "pending" too
	aStatus, err = attempt.Status()
	c.Assert(err, check.IsNil)
	c.Check(aStatus, check.Equals, coordinate.Pending)

	// The active attempt for the unit should match this
	attempt2, err = unit.ActiveAttempt()
	c.Assert(err, check.IsNil)
	c.Check(attempt2, AttemptMatches, attempt)

	// There should be one active attempt for the worker and it should
	// also match
	attempts, err = worker.ActiveAttempts()
	c.Assert(err, check.IsNil)
	c.Check(attempts, check.HasLen, 1)
	if len(attempts) > 0 {
		c.Check(attempts[0], AttemptMatches, attempt)
	}

	// The work unit data should (still) be defined but empty
	data, err = unit.Data()
	c.Assert(err, check.IsNil)
	c.Check(data, check.HasLen, 0)

	// Now finish the attempt with some updated data
	err = attempt.Finish(map[string]interface{}{
		"outputs": []string{"yes"},
	})
	c.Assert(err, check.IsNil)

	// The unit should report "finished"
	uStatus, err = unit.Status()
	c.Assert(err, check.IsNil)
	c.Check(uStatus, check.Equals, coordinate.FinishedUnit)

	// The attempt should report "finished"
	aStatus, err = attempt.Status()
	c.Assert(err, check.IsNil)
	c.Check(aStatus, check.Equals, coordinate.Finished)

	// The attempt should still be the active attempt for the unit
	attempt2, err = unit.ActiveAttempt()
	c.Assert(err, check.IsNil)
	c.Check(attempt2, AttemptMatches, attempt)

	// The attempt should not be in the active attempt list for the worker
	attempts, err = worker.ActiveAttempts()
	c.Assert(err, check.IsNil)
	c.Check(attempts, check.HasLen, 0)

	// Both the unit and the worker should have one archived attempt
	attempts, err = unit.Attempts()
	c.Assert(err, check.IsNil)
	c.Check(attempts, check.HasLen, 1)
	if len(attempts) > 0 {
		c.Check(attempts[0], AttemptMatches, attempt)
	}

	attempts, err = worker.AllAttempts()
	c.Assert(err, check.IsNil)
	c.Check(attempts, check.HasLen, 1)
//.........这里部分代码省略.........

// TestSetMeta tests the basic SetMeta() call and a couple of its
// documented oddities.
func (s *Suite) TestSetMeta(c *check.C) {
	var (
		err  error
		spec coordinate.WorkSpec
		meta coordinate.WorkSpecMeta
	)
	spec, err = s.Namespace.SetWorkSpec(map[string]interface{}{
		"name":       "spec",
		"min_gb":     1,
		"continuous": true,
	})
	c.Assert(err, check.IsNil)

	meta, err = spec.Meta(false)
	c.Assert(err, check.IsNil)
	c.Check(meta.Priority, check.Equals, 0)
	c.Check(meta.Weight, check.Equals, 20)
	c.Check(meta.Paused, check.Equals, false)
	c.Check(meta.Continuous, check.Equals, true)
	c.Check(meta.CanBeContinuous, check.Equals, true)
	c.Check(meta.Interval, check.Equals, time.Duration(0))
	c.Check(meta.NextContinuous, check.Equals, time.Time{})
	c.Check(meta.MaxRunning, check.Equals, 0)
	c.Check(meta.MaxAttemptsReturned, check.Equals, 0)
	c.Check(meta.NextWorkSpecName, check.Equals, "")
	c.Check(meta.AvailableCount, check.Equals, 0)
	c.Check(meta.PendingCount, check.Equals, 0)

	err = spec.SetMeta(coordinate.WorkSpecMeta{
		Priority:            10,
		Weight:              100,
		Paused:              true,
		Continuous:          false,
		CanBeContinuous:     false,
		Interval:            time.Duration(60) * time.Second,
		MaxRunning:          10,
		MaxAttemptsReturned: 1,
		NextWorkSpecName:    "then",
		AvailableCount:      100,
		PendingCount:        50,
	})
	c.Assert(err, check.IsNil)

	meta, err = spec.Meta(false)
	c.Assert(err, check.IsNil)
	c.Check(meta.Priority, check.Equals, 10)
	c.Check(meta.Weight, check.Equals, 100)
	c.Check(meta.Paused, check.Equals, true)
	c.Check(meta.Continuous, check.Equals, false)
	// Cannot clear "can be continuous" flag
	c.Check(meta.CanBeContinuous, check.Equals, true)
	c.Check(meta.Interval, check.Equals, time.Duration(60)*time.Second)
	c.Check(meta.NextContinuous, check.Equals, time.Time{})
	c.Check(meta.MaxRunning, check.Equals, 10)
	c.Check(meta.MaxAttemptsReturned, check.Equals, 1)
	// Cannot change following work spec
	c.Check(meta.NextWorkSpecName, check.Equals, "")
	// Cannot set the counts
	c.Check(meta.AvailableCount, check.Equals, 0)
	c.Check(meta.PendingCount, check.Equals, 0)
}

// TestWorkUnitChaining tests that completing work units in one work spec
// will cause work units to appear in another, if so configured.
func (s *Suite) TestWorkUnitChaining(c *check.C) {
	var (
		err      error
		worker   coordinate.Worker
		one, two coordinate.WorkSpec
		units    map[string]coordinate.WorkUnit
		attempts []coordinate.Attempt
		data     map[string]interface{}
		ok       bool
	)

	one, err = s.Namespace.SetWorkSpec(map[string]interface{}{
		"name": "one",
		"then": "two",
	})
	c.Assert(err, check.IsNil)

	two, err = s.Namespace.SetWorkSpec(map[string]interface{}{
		"name":     "two",
		"disabled": true,
	})
	c.Assert(err, check.IsNil)

	worker, err = s.Namespace.Worker("worker")
	c.Assert(err, check.IsNil)

	// Create and perform a work unit, with no output
	_, err = one.AddWorkUnit("a", map[string]interface{}{}, 0.0)
	c.Assert(err, check.IsNil)

	attempts, err = worker.RequestAttempts(coordinate.AttemptRequest{})
	c.Assert(err, check.IsNil)
	c.Assert(attempts, check.HasLen, 1)

	err = attempts[0].Finish(nil)
	c.Assert(err, check.IsNil)

	units, err = two.WorkUnits(coordinate.WorkUnitQuery{})
	c.Assert(err, check.IsNil)
	c.Check(units, HasKeys, []string{})

	// Create and perform a work unit, with a map output
	_, err = one.AddWorkUnit("b", map[string]interface{}{}, 0.0)
	c.Assert(err, check.IsNil)

	attempts, err = worker.RequestAttempts(coordinate.AttemptRequest{})
	c.Assert(err, check.IsNil)
	c.Assert(attempts, check.HasLen, 1)

	err = attempts[0].Finish(map[string]interface{}{
		"output": map[string]interface{}{
			"two_b": map[string]interface{}{"k": "v"},
		},
	})
	c.Assert(err, check.IsNil)

	units, err = two.WorkUnits(coordinate.WorkUnitQuery{})
	c.Assert(err, check.IsNil)
	c.Check(units, HasKeys, []string{"two_b"})

	if _, ok = units["two_b"]; ok {
		data, err = units["two_b"].Data()
		c.Assert(err, check.IsNil)
		c.Check(data, check.DeepEquals, map[string]interface{}{"k": "v"})
	}

	// Create and perform a work unit, with a slice output
	_, err = one.AddWorkUnit("c", map[string]interface{}{}, 0.0)
	c.Assert(err, check.IsNil)

	attempts, err = worker.RequestAttempts(coordinate.AttemptRequest{})
	c.Assert(err, check.IsNil)
	c.Assert(attempts, check.HasLen, 1)

	err = attempts[0].Finish(map[string]interface{}{
		"output": []string{"two_c", "two_cc"},
	})
	c.Assert(err, check.IsNil)

	units, err = two.WorkUnits(coordinate.WorkUnitQuery{})
	c.Assert(err, check.IsNil)
	c.Check(units, HasKeys, []string{"two_b", "two_c", "two_cc"})

	if _, ok = units["two_c"]; ok {
		data, err = units["two_c"].Data()
		c.Assert(err, check.IsNil)
		c.Check(data, check.DeepEquals, map[string]interface{}{})
	}

	// Put the output in the original work unit data
	_, err = one.AddWorkUnit("d", map[string]interface{}{
		"output": []string{"two_d"},
	}, 0.0)
	c.Assert(err, check.IsNil)
	attempts, err = worker.RequestAttempts(coordinate.AttemptRequest{})
	c.Assert(err, check.IsNil)
	c.Assert(attempts, check.HasLen, 1)

//.........这里部分代码省略.........

// UpdateWorkUnit causes some state change in a work unit.  If the
// work unit is pending, this is the principal interface to complete
// or renew it; if it is already complete this can cause it to be
// retried.
func (jobs *JobServer) UpdateWorkUnit(
	workSpecName string,
	workUnitKey string,
	options map[string]interface{},
) (bool, string, error) {
	// Note that in several corner cases, the behavior of this as
	// written disagrees with Python coordinated's:
	//
	// * If neither "lease_time" nor "status" is specified,
	//   Python coordinated immediately returns False without
	//   checking if workUnitKey is valid
	//
	// * Python coordinated allows arbitrary status changes,
	//   including AVAILABLE -> FINISHED
	//
	// * This openly ignores "worker_id", as distinct from Python
	//   coordinated, which logs an obscure warning and changes it,
	//   but only on a renew
	var (
		attempt    coordinate.Attempt
		changed    bool
		err        error
		status     coordinate.AttemptStatus
		uwuOptions UpdateWorkUnitOptions
		workSpec   coordinate.WorkSpec
		workUnit   coordinate.WorkUnit
	)
	err = decode(&uwuOptions, options)
	if err == nil {
		workSpec, err = jobs.Namespace.WorkSpec(workSpecName)
	}
	if err == nil {
		workUnit, err = workSpec.WorkUnit(workUnitKey)
	}
	if err == nil {
		if workUnit == nil {
			return false, fmt.Sprintf("no such work unit key=%v", workUnitKey), nil
		}
	}
	if err == nil {
		attempt, err = workUnit.ActiveAttempt()
	}
	if err == nil && attempt != nil {
		status, err = attempt.Status()
	}
	if err == nil && attempt != nil {
		if status == coordinate.Expired || status == coordinate.Retryable {
			// The Python Coordinate API sees both of these
			// statuses as "available", and we want to fall
			// into the next block.
			attempt = nil
		}
	}
	if err == nil && attempt == nil {
		// Caller is trying to manipulate an AVAILABLE work
		// unit.  Cowardly refuse to start a new attempt on
		// their behalf, or to update the persistent work unit
		// data this way.  (In theory there's no reason we
		// *couldn't* do either, though I'm not aware of any
		// callers that do; add_work_unit will replace
		// existing work units and is the more typical way to
		// refresh data.)
		err = errors.New("update_work_unit will not adjust an available work unit")
	}
	if err == nil {
		switch status {
		case coordinate.Pending:
			changed = true // or there's an error
			switch uwuOptions.Status {
			case 0, Pending:
				err = uwuRenew(attempt, uwuOptions)
			case Available:
				err = attempt.Expire(uwuOptions.Data)
			case Finished:
				err = attempt.Finish(uwuOptions.Data)
			case Failed:
				err = attempt.Fail(uwuOptions.Data)
			default:
				err = errors.New("update_work_unit invalid status")
			}
		case coordinate.Expired:
			err = errors.New("update_work_unit logic error, trying to refresh expired unit")
		case coordinate.Finished:
			switch uwuOptions.Status {
			case 0, Finished:
				changed = false // no-op
			case Available:
				err = workUnit.ClearActiveAttempt()
				changed = true
			case Failed:
				changed = false // see below
			default:
				err = errors.New("update_work_unit cannot change finished unit")
			}
		case coordinate.Failed:
			switch uwuOptions.Status {
//.........这里部分代码省略.........

// TestTwoWorkSpecsBasic ensures that two work specs can be created
// and have independent lifetimes.
func (s *Suite) TestTwoWorkSpecsBasic(c *check.C) {
	var (
		err          error
		dict1, dict2 map[string]interface{}
		name1, name2 string
		names        []string
		spec         coordinate.WorkSpec
	)
	name1 = "spec1"
	name2 = "spec2"

	dict1 = map[string]interface{}{"name": name1, "min_gb": 1}
	dict2 = map[string]interface{}{"name": name2, "min_gb": 2}

	names, err = s.Namespace.WorkSpecNames()
	c.Assert(err, check.IsNil)
	c.Check(names, check.HasLen, 0)

	spec, err = s.Namespace.SetWorkSpec(dict1)
	c.Assert(err, check.IsNil)

	names, err = s.Namespace.WorkSpecNames()
	c.Assert(err, check.IsNil)
	c.Check(names, check.DeepEquals, []string{name1})

	spec, err = s.Namespace.SetWorkSpec(dict2)
	c.Assert(err, check.IsNil)

	names, err = s.Namespace.WorkSpecNames()
	c.Assert(err, check.IsNil)
	c.Check(names, check.HasLen, 2)
	if len(names) > 0 {
		if names[0] == name1 {
			c.Check(names, check.DeepEquals, []string{name1, name2})
		} else {
			c.Check(names, check.DeepEquals, []string{name2, name1})
		}
	}

	spec, err = s.Namespace.WorkSpec(name1)
	c.Assert(err, check.IsNil)
	c.Assert(spec, check.NotNil)
	c.Check(spec.Name(), check.Equals, name1)

	spec, err = s.Namespace.WorkSpec(name2)
	c.Assert(err, check.IsNil)
	c.Assert(spec, check.NotNil)
	c.Check(spec.Name(), check.Equals, name2)

	err = s.Namespace.DestroyWorkSpec(name1)
	c.Assert(err, check.IsNil)

	names, err = s.Namespace.WorkSpecNames()
	c.Assert(err, check.IsNil)
	c.Check(names, check.DeepEquals, []string{name2})

	spec, err = s.Namespace.WorkSpec(name1)
	c.Check(err, check.DeepEquals, coordinate.ErrNoSuchWorkSpec{Name: name1})

	spec, err = s.Namespace.WorkSpec(name2)
	c.Assert(err, check.IsNil)
	c.Assert(spec, check.NotNil)
	c.Check(spec.Name(), check.Equals, name2)

	err = s.Namespace.DestroyWorkSpec(name2)
	c.Assert(err, check.IsNil)

	names, err = s.Namespace.WorkSpecNames()
	c.Assert(err, check.IsNil)
	c.Check(names, check.HasLen, 0)

	spec, err = s.Namespace.WorkSpec(name1)
	c.Check(err, check.DeepEquals, coordinate.ErrNoSuchWorkSpec{Name: name1})

	spec, err = s.Namespace.WorkSpec(name2)
	c.Check(err, check.DeepEquals, coordinate.ErrNoSuchWorkSpec{Name: name2})
}

// TestChainingMixed uses a combination of strings and tuples in its
// "output" data.
func (s *Suite) TestChainingMixed(c *check.C) {
	var (
		one, two coordinate.WorkSpec
		worker   coordinate.Worker
		attempts []coordinate.Attempt
		units    map[string]coordinate.WorkUnit
		unit     coordinate.WorkUnit
		data     map[string]interface{}
		priority float64
		ok       bool
		err      error
	)

	one, err = s.Namespace.SetWorkSpec(map[string]interface{}{
		"name": "one",
		"then": "two",
	})
	c.Assert(err, check.IsNil)

	two, err = s.Namespace.SetWorkSpec(map[string]interface{}{
		"name": "two",
	})
	c.Assert(err, check.IsNil)

	worker, err = s.Namespace.Worker("worker")
	c.Assert(err, check.IsNil)

	_, err = one.AddWorkUnit("a", map[string]interface{}{}, 0.0)
	c.Assert(err, check.IsNil)

	attempts, err = worker.RequestAttempts(coordinate.AttemptRequest{})
	c.Assert(err, check.IsNil)
	c.Assert(attempts, check.HasLen, 1)

	err = attempts[0].Finish(map[string]interface{}{
		"output": []interface{}{
			"key",
			cborrpc.PythonTuple{Items: []interface{}{
				"key",
				map[string]interface{}{
					"data": "x",
				},
				map[string]interface{}{
					"priority": 10.0,
				},
			}},
		},
	})
	c.Assert(err, check.IsNil)

	units, err = two.WorkUnits(coordinate.WorkUnitQuery{})
	c.Assert(err, check.IsNil)
	c.Check(units, HasKeys, []string{"key"})
	if unit, ok = units["key"]; ok {
		data, err = unit.Data()
		c.Assert(err, check.IsNil)
		c.Check(data, check.DeepEquals, map[string]interface{}{"data": "x"})

		priority, err = unit.Priority()
		c.Assert(err, check.IsNil)
		c.Check(priority, check.Equals, 10.0)
	}
}

// ------------------------------------------------------------------------
// Coordinate setup helpers:
func createWorkUnits(spec coordinate.WorkSpec, n int, c *check.C) {
	for i := 0; i < n; i++ {
		_, err := spec.AddWorkUnit(fmt.Sprintf("u%v", i), map[string]interface{}{}, 0.0)
		c.Assert(err, check.IsNil)
	}
}

// TestChainingTwoStep separately renews an attempt to insert an output
// key, then finishes the work unit; it should still chain.
func (s *Suite) TestChainingTwoStep(c *check.C) {
	var (
		one, two coordinate.WorkSpec
		worker   coordinate.Worker
		attempts []coordinate.Attempt
		units    map[string]coordinate.WorkUnit
		unit     coordinate.WorkUnit
		data     map[string]interface{}
		priority float64
		ok       bool
		err      error
	)

	one, err = s.Namespace.SetWorkSpec(map[string]interface{}{
		"name": "one",
		"then": "two",
	})
	c.Assert(err, check.IsNil)

	two, err = s.Namespace.SetWorkSpec(map[string]interface{}{
		"name": "two",
	})
	c.Assert(err, check.IsNil)

	worker, err = s.Namespace.Worker("worker")
	c.Assert(err, check.IsNil)

	_, err = one.AddWorkUnit("a", map[string]interface{}{}, 0.0)
	c.Assert(err, check.IsNil)

	attempts, err = worker.RequestAttempts(coordinate.AttemptRequest{})
	c.Assert(err, check.IsNil)
	c.Assert(attempts, check.HasLen, 1)

	err = attempts[0].Renew(time.Duration(900)*time.Second,
		map[string]interface{}{
			"output": []interface{}{
				[]byte{1, 2, 3, 4},
				cborrpc.PythonTuple{Items: []interface{}{
					[]byte{1, 2, 3, 4},
					map[interface{}]interface{}{},
					map[interface{}]interface{}{
						"priority": 0,
					},
				}},
			},
		})
	c.Assert(err, check.IsNil)

	err = attempts[0].Finish(nil)

	units, err = two.WorkUnits(coordinate.WorkUnitQuery{})
	c.Assert(err, check.IsNil)
	c.Check(units, HasKeys, []string{"\x01\x02\x03\x04"})
	if unit, ok = units["\x01\x02\x03\x04"]; ok {
		data, err = unit.Data()
		c.Assert(err, check.IsNil)
		c.Check(data, check.DeepEquals, map[string]interface{}{})

		priority, err = unit.Priority()
		c.Assert(err, check.IsNil)
		c.Check(priority, check.Equals, 0.0)
	}
}