scheduler

Documentation

Index

• Variables
• type JobFunc
• type RuntimeFunc
• type Service

Variables

var ErrJobAlreadyExists = errors.New("job already exists")

ErrJobAlreadyExists is returned when the scheduler is asked to create a job that already exists.

var ErrJobFinalised = errors.New("job finalised")

ErrJobFinalised is returned when the scheduler is asked to interact with a job that is finalised.

var ErrJobRunning = errors.New("job running")

ErrJobRunning is returned when the scheduler is asked to interact with a job that is running.

var ErrNoJobFunc = errors.New("no job function")

ErrNoJobFunc is returned when an attempt is made to run a nil job.

var ErrNoJobName = errors.New("no job name")

ErrNoJobName is returned when an attempt is made to control a job without a name.

var ErrNoMoreInstances = errors.New("no more instances")

ErrNoMoreInstances is returned by the runtime generator when it has no more instances.

var ErrNoRuntimeFunc = errors.New("no runtime function")

ErrNoRuntimeFunc is returned when an attempt is made to run a periodic job without a runtime function.

var ErrNoSuchJob = errors.New("no such job")

ErrNoSuchJob is returned when the scheduler is asked to act upon a job about which it has no information.

Types

type JobFunc

type JobFunc func(context.Context)

JobFunc is the type for jobs.

type RuntimeFunc

type RuntimeFunc func(context.Context) (time.Time, error)

RuntimeFunc is the type of a function that generates the next runtime.

type Service

type Service interface {
	// ScheduleJob schedules a one-off job for a given time.
	// This function returns two cancel funcs.  If the first is triggered the job will not run.  If the second is triggered the job
	// runs immediately.
	// Note that if the parent context is cancelled the job wil not run.
	ScheduleJob(ctx context.Context, class string, name string, runtime time.Time, job JobFunc) error

	// SchedulePeriodicJob schedules a job to run in a loop.
	// The loop starts by calling runtimeFunc, which sets the time for the first run.
	// Once the time as specified by runtimeFunc is met, jobFunc is called.
	// Once jobFunc returns, go back to the beginning of the loop.
	SchedulePeriodicJob(ctx context.Context, class string, name string, runtime RuntimeFunc, job JobFunc) error

	// CancelJob cancels a known job.
	// If this is a period job then all future instances are cancelled.
	CancelJob(ctx context.Context, name string) error

	// CancelJobIfExists cancels a job that may or may not exist.
	// If this is a period job then all future instances are cancelled.
	CancelJobIfExists(ctx context.Context, name string)

	// CancelJobs cancels all jobs with the given prefix.
	// If the prefix matches a period job then all future instances are cancelled.
	CancelJobs(ctx context.Context, prefix string)

	// RunJob runs a known job.
	// If this is a period job then the next instance will be scheduled.
	RunJob(ctx context.Context, name string) error

	// JobExists returns true if a job exists.
	JobExists(ctx context.Context, name string) bool

	// RunJobIfExists runs a job if it exists.
	// If this is a period job then the next instance will be scheduled.
	RunJobIfExists(ctx context.Context, name string)

	// ListJobs returns the names of all jobs.
	ListJobs(ctx context.Context) []string
}

Service is the interface for schedulers.