learning/tour-of-beam/learning-content/windowing/session-window/go-example/main.go

// 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.

// beam-playground:
//   name: session-window
//   description: Session window example.
//   multifile: false
//   context_line: 39
//   categories:
//     - Quickstart
//   complexity: ADVANCED
//   tags:
//     - hellobeam

package main

import (
	"context"
	"fmt"
	"github.com/apache/beam/sdks/v2/go/pkg/beam"
	"github.com/apache/beam/sdks/v2/go/pkg/beam/core/graph/window"
	"github.com/apache/beam/sdks/v2/go/pkg/beam/log"
	"github.com/apache/beam/sdks/v2/go/pkg/beam/x/beamx"
	"time"
)

func main() {
	p, s := beam.NewPipelineWithRoot()

	input := beam.Create(s, "Hello", "world", "it`s", "Windowing")

	sessionWindowedItems := beam.WindowInto(s, window.NewSessions(600*time.Second), input)

	output(s, sessionWindowedItems)

	err := beamx.Run(context.Background(), p)
	if err != nil {
		log.Exitf(context.Background(), "Failed to execute job: %v", err)
	}
}

func output(s beam.Scope, input beam.PCollection) {
	beam.ParDo0(s, func(element interface{}) {
		fmt.Println(element)
	}, input)
}