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main.go
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main.go
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// 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: WindowingChallenge
// description: Windowing motivating challenge.
// multifile: false
// context_line: 43
// categories:
// - Quickstart
// complexity: ADVANCED
// tags:
// - hellobeam
package main
import (
"context"
"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/io/textio"
"github.com/apache/beam/sdks/v2/go/pkg/beam/log"
_ "github.com/apache/beam/sdks/v2/go/pkg/beam/transforms/stats"
"github.com/apache/beam/sdks/v2/go/pkg/beam/x/beamx"
"github.com/apache/beam/sdks/v2/go/pkg/beam/x/debug"
"strconv"
"strings"
_ "time"
)
func main() {
ctx := context.Background()
p, s := beam.NewPipelineWithRoot()
input := textio.Read(s, "gs://apache-beam-samples/nyc_taxi/misc/sample1000.csv")
// Extract cost from PCollection
cost := ExtractCostFromFile(s, input)
debug.Printf(s, "Above pCollection output", cost)
err := beamx.Run(ctx, p)
if err != nil {
log.Exitf(context.Background(), "Failed to execute job: %v", err)
}
}
func ExtractCostFromFile(s beam.Scope, input beam.PCollection) beam.PCollection {
return beam.ParDo(s, func(line string) float64 {
taxi := strings.Split(strings.TrimSpace(line), ",")
if len(taxi) > 16 {
cost, _ := strconv.ParseFloat(taxi[16], 64)
return cost
}
return 0.0
}, input)
}