damccorm commented on code in PR #17574: URL: https://github.com/apache/beam/pull/17574#discussion_r867397465
########## sdks/go/pkg/beam/registration/emitterIterRegistration.go: ########## @@ -0,0 +1,298 @@ +// Licensed to the Apache Software Foundation (ASF) under one or more +// contributor license agreements. See the NOTICE file distributed with +// this work for additional information regarding copyright ownership. +// The ASF licenses this file to You under the Apache License, Version 2.0 +// (the "License"); you may not use this file except in compliance with +// the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package registration + +import ( + "context" + "fmt" + "io" + "reflect" + + "github.com/apache/beam/sdks/v2/go/pkg/beam/core/runtime/exec" + "github.com/apache/beam/sdks/v2/go/pkg/beam/core/typex" +) + +type emitNative1[T any] struct { + n exec.ElementProcessor + fn interface{} + + ctx context.Context + ws []typex.Window + et typex.EventTime + value exec.FullValue +} + +func (e *emitNative1[T]) Init(ctx context.Context, ws []typex.Window, et typex.EventTime) error { + e.ctx = ctx + e.ws = ws + e.et = et + return nil +} + +func (e *emitNative1[T]) Value() interface{} { + return e.fn +} + +func (e *emitNative1[T]) invoke(val T) { + e.value = exec.FullValue{Windows: e.ws, Timestamp: e.et, Elm: val} + if err := e.n.ProcessElement(e.ctx, &e.value); err != nil { + panic(err) + } +} + +type emitNative2[T1, T2 any] struct { + n exec.ElementProcessor + fn interface{} + + ctx context.Context + ws []typex.Window + et typex.EventTime + value exec.FullValue +} + +func (e *emitNative2[T1, T2]) Init(ctx context.Context, ws []typex.Window, et typex.EventTime) error { + e.ctx = ctx + e.ws = ws + e.et = et + return nil +} + +func (e *emitNative2[T1, T2]) Value() interface{} { + return e.fn +} + +func (e *emitNative2[T1, T2]) invoke(key T1, val T2) { + e.value = exec.FullValue{Windows: e.ws, Timestamp: e.et, Elm: key, Elm2: val} + if err := e.n.ProcessElement(e.ctx, &e.value); err != nil { + panic(err) + } +} + +type emitNative1WithTimestamp[T any] struct { + n exec.ElementProcessor + fn interface{} + + ctx context.Context + ws []typex.Window + et typex.EventTime + value exec.FullValue +} + +func (e *emitNative1WithTimestamp[T]) Init(ctx context.Context, ws []typex.Window, et typex.EventTime) error { + e.ctx = ctx + e.ws = ws + e.et = et + return nil +} + +func (e *emitNative1WithTimestamp[T]) Value() interface{} { + return e.fn +} + +func (e *emitNative1WithTimestamp[T]) invoke(et typex.EventTime, val T) { + e.value = exec.FullValue{Windows: e.ws, Timestamp: et, Elm: val} + if err := e.n.ProcessElement(e.ctx, &e.value); err != nil { + panic(err) + } +} + +type emitNative2WithTimestamp[T1, T2 any] struct { + n exec.ElementProcessor + fn interface{} + + ctx context.Context + ws []typex.Window + et typex.EventTime + value exec.FullValue +} + +func (e *emitNative2WithTimestamp[T1, T2]) Init(ctx context.Context, ws []typex.Window, et typex.EventTime) error { + e.ctx = ctx + e.ws = ws + e.et = et + return nil +} + +func (e *emitNative2WithTimestamp[T1, T2]) Value() interface{} { + return e.fn +} + +func (e *emitNative2WithTimestamp[T1, T2]) invoke(et typex.EventTime, key T1, val T2) { + e.value = exec.FullValue{Windows: e.ws, Timestamp: et, Elm: key, Elm2: val} + if err := e.n.ProcessElement(e.ctx, &e.value); err != nil { + panic(err) + } +} + +// RegisterEmitter1 registers parameters from your DoFn with a +// signature func(T) and optimizes their execution. +// This must be done by passing in a reference to an instantiated version +// of the function, aka: +// registration.RegisterEmitter1[T]((*func(T))(nil)) +func RegisterEmitter1[T1 any](e *func(T1)) { + registerFunc := func(n exec.ElementProcessor) exec.ReusableEmitter { + gen := &emitNative1[T1]{n: n} + gen.fn = gen.invoke + return gen + } + exec.RegisterEmitter(reflect.TypeOf(e).Elem(), registerFunc) +} + +// RegisterEmitter2 registers parameters from your DoFn with a +// signature func(T1, T2) and optimizes their execution. +// This must be done by passing in a reference to an instantiated version +// of the function, aka: +// registration.RegisterEmitter2[T1, T2]((*func(T1, T2))(nil)) +func RegisterEmitter2[T1, T2 any](e *func(T1, T2)) { + registerFunc := func(n exec.ElementProcessor) exec.ReusableEmitter { + gen := &emitNative2[T1, T2]{n: n} + gen.fn = gen.invoke + return gen + } + if reflect.TypeOf(e).Elem().In(0) == typex.EventTimeType { + registerFunc = func(n exec.ElementProcessor) exec.ReusableEmitter { + gen := &emitNative1WithTimestamp[T2]{n: n} + gen.fn = gen.invoke + return gen + } + } + exec.RegisterEmitter(reflect.TypeOf(e).Elem(), registerFunc) +} + +// RegisterEmitter3 registers parameters from your DoFn with a +// signature func(T1, T2, T3) and optimizes their execution. +// This must be done by passing in a reference to an instantiated version +// of the function, aka: +// registration.RegisterEmitter3[T1, T2, T3]((*func(T1, T2, T3))(nil)) +func RegisterEmitter3[T1, T2, T3 any](e *func(T1, T2, T3)) { + registerFunc := func(n exec.ElementProcessor) exec.ReusableEmitter { + gen := &emitNative2WithTimestamp[T2, T3]{n: n} + gen.fn = gen.invoke + return gen + } + exec.RegisterEmitter(reflect.TypeOf(e).Elem(), registerFunc) +} + +type iterNative1[T any] struct { + s exec.ReStream + fn interface{} + + // cur is the "current" stream, if any. + cur exec.Stream +} + +func (v *iterNative1[T]) Init() error { + cur, err := v.s.Open() + if err != nil { + return err + } + v.cur = cur + return nil +} + +func (v *iterNative1[T]) Value() interface{} { + return v.fn +} + +func (v *iterNative1[T]) Reset() error { + if err := v.cur.Close(); err != nil { + return err + } + v.cur = nil + return nil +} + +func (v *iterNative1[T]) invoke(value *T) bool { + elm, err := v.cur.Read() + if err != nil { + if err == io.EOF { + return false + } + panic(fmt.Sprintf("broken stream: %v", err)) + } + *value = elm.Elm.(T) + return true +} + +type iterNative2[T1, T2 any] struct { + s exec.ReStream + fn interface{} + + // cur is the "current" stream, if any. + cur exec.Stream +} + +func (v *iterNative2[T1, T2]) Init() error { + cur, err := v.s.Open() + if err != nil { + return err + } + v.cur = cur + return nil +} + +func (v *iterNative2[T1, T2]) Value() interface{} { + return v.fn +} + +func (v *iterNative2[T1, T2]) Reset() error { + if err := v.cur.Close(); err != nil { + return err + } + v.cur = nil + return nil +} + +func (v *iterNative2[T1, T2]) invoke(key *T1, value *T2) bool { + elm, err := v.cur.Read() + if err != nil { + if err == io.EOF { + return false + } + panic(fmt.Sprintf("broken stream: %v", err)) + } + *key = elm.Elm.(T1) + *value = elm.Elm2.(T2) + return true +} + +// RegisterIter1 registers parameters from your DoFn with a +// signature func(*T) bool and optimizes their execution. +// This must be done by passing in a reference to an instantiated version +// of the function, aka: +// registration.RegisterIter1[T]((*func(*T) bool)(nil)) +func RegisterIter1[T any](i *func(*T) bool) { Review Comment: Yeah, I think its a good idea to do that eventually, I'd scope that out of this PR though. It shouldn't be too hard to build off of this one once we have a pattern established though. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
