package batcher

import "github.com/eapache/go-resiliency/batcher"

Package batcher implements the batching resiliency pattern for Go.

Index ¶

• type Batcher
• func New(timeout time.Duration, doWork func([]interface{}) error) *Batcher
• func (b *Batcher) Prefilter(filter func(interface{}) error)
• func (b *Batcher) Run(param interface{}) error
• func (b *Batcher) Shutdown(wait bool)

Examples ¶

• Batcher

Types ¶

type Batcher ¶

type Batcher struct {
	// contains filtered or unexported fields
}

Batcher implements the batching resiliency pattern

{
	b := New(10*time.Millisecond, func(params []interface{}) error {
		// do something with the batch of parameters
		return nil
	})

	b.Prefilter(func(param interface{}) error {
		// do some sort of sanity check on the parameter, and return an error if it fails
		return nil
	})

	for i := 0; i < 10; i++ {
		go b.Run(i)
	}
}

func New ¶

func New(timeout time.Duration, doWork func([]interface{}) error) *Batcher

New constructs a new batcher that will batch all calls to Run that occur within `timeout` time before calling doWork just once for the entire batch. The doWork function must be safe to run concurrently with itself as this may occur, especially when the doWork function is slow, or the timeout is small.

func (*Batcher) Prefilter ¶

func (b *Batcher) Prefilter(filter func(interface{}) error)

Prefilter specifies an optional function that can be used to run initial checks on parameters passed to Run before being added to the batch. If the prefilter returns a non-nil error, that error is returned immediately from Run and the batcher is not invoked. A prefilter cannot safely be specified for a batcher if Run has already been invoked. The filter function specified must be concurrency-safe.

func (*Batcher) Run ¶

func (b *Batcher) Run(param interface{}) error

Run runs the work function with the given parameter, possibly including it in a batch with other calls to Run that occur within the specified timeout. It is safe to call Run concurrently on the same batcher.

func (*Batcher) Shutdown ¶

func (b *Batcher) Shutdown(wait bool)

Shutdown flushes and executes any pending batches. If wait is true, it also waits for the pending batches to finish executing before it returns. This can be used to avoid waiting for the timeout to expire when gracefully shutting down your application. Calling Run at any point after calling Shutdown will lead to undefined behaviour.

Source Files ¶

batcher.go