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allinone2.go
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allinone2.go
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// package allinone is an experimental mockup of an Apache Beam Go SDK API that
// leverages generics, and a more opinionated construction method. It exists
// to explore the ergonomics and feasibility of such an approach.
//
// Core Ideas:
// * Single Process method, that is passed a special beam context object: DoFnC.
// - User manage Iteration avoids start and finish bundle.
// - Isolating certain types to passed in callbacks avoids context errors.
// - Should also avoid certain issues around sampling, and
// - Beam context object has specific methods that can accept a function to push iterate over.
package main
import (
"context"
"fmt"
"github.com/lostluck/experimental/altbeams/allinone2/beam"
)
type MyDoFn struct {
Name string
Output beam.Output[string]
beam.OnBundleFinish
}
func (fn *MyDoFn) ProcessBundle(ctx context.Context, dfc *beam.DFC[string]) error {
// Do some startbundle work.
fmt.Printf("%v started\n", fn.Name)
processed := 0
dfc.Process(func(ec beam.ElmC, elm string) error {
processed++
fmt.Printf("%v \n", fn.Name)
fn.Output.Emit(ec, elm)
return nil
})
fn.OnBundleFinish.Do(dfc, func() error {
// Do some finish bundle work.
fmt.Printf("%v finished - %v processsed\n", fn.Name, processed)
return nil
})
return nil
}
type MyIncDoFn struct {
Name string
Output beam.Output[int]
beam.OnBundleFinish
}
func (fn *MyIncDoFn) ProcessBundle(ctx context.Context, dfc *beam.DFC[int]) error {
// Do some startbundle work.
fmt.Printf("%v started\n", fn.Name)
processed := 0
dfc.Process(func(ec beam.ElmC, elm int) error {
processed++
elm += 1
fmt.Printf("%v %v\n", fn.Name, elm)
fn.Output.Emit(ec, elm)
return nil
})
fn.OnBundleFinish.Do(dfc, func() error {
// Do some finish bundle work.
fmt.Printf("%v finished - %v processsed\n", fn.Name, processed)
return nil
})
return nil
}
type SourceFn struct {
Name string
Count int
Output beam.Output[int]
beam.OnBundleFinish
}
func (fn *SourceFn) ProcessBundle(ctx context.Context, dfc *beam.DFC[[]byte]) error {
// Do some startbundle work.
fmt.Printf("%v started\n", fn.Name)
processed := 0
dfc.Process(func(ec beam.ElmC, _ []byte) error {
for i := 0; i < fn.Count; i++ {
processed++
fmt.Printf("%v %v\n", fn.Name, i)
fn.Output.Emit(ec, i)
}
return nil
})
fn.OnBundleFinish.Do(dfc, func() error {
// Do some finish bundle work.
fmt.Printf("%v finished - %v processsed\n", fn.Name, processed)
return nil
})
return nil
}
type DiscardFn[E any] struct {
Name string
beam.OnBundleFinish
Processed beam.Counter
}
func (fn *DiscardFn[E]) ProcessBundle(ctx context.Context, dfc *beam.DFC[E]) error {
// Do some startbundle work.
fmt.Printf("%v started\n", fn.Name)
dfc.Process(func(ec beam.ElmC, elm E) error {
fn.Processed.Inc(dfc, 1)
fmt.Printf("%v %v\n", fn.Name, elm)
return nil
})
fn.OnBundleFinish.Do(dfc, func() error {
// Do some finish bundle work.
fmt.Printf("%v finished\n", fn.Name)
return nil
})
return nil
}
func main() {
pr, err := beam.Run(context.TODO(), func(s *beam.Scope) error {
imp := beam.Impulse(s)
src := beam.ParDo(s, imp, &SourceFn{
Name: "Source",
Count: 10,
})
inc := beam.ParDo(s, src.Output, &MyIncDoFn{
Name: "IncFn",
})
beam.ParDo(s, inc.Output, &DiscardFn[int]{
Name: "DiscardFn",
}, beam.Name("sink"))
return nil
}, beam.Name("testjob"), beam.Endpoint("localhost:8073"))
if err != nil {
fmt.Println("error:", err)
} else {
fmt.Println("results:", pr)
}
}