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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: CoreTransformsSolution2
// description: Core Transforms second motivating challenge.
// multifile: false
// context_line: 48
// categories:
// - Quickstart
// complexity: BASIC
// tags:
// - hellobeam
package main
import (
"context"
"github.com/apache/beam/sdks/v2/go/pkg/beam"
"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/filter"
"github.com/apache/beam/sdks/v2/go/pkg/beam/x/beamx"
"github.com/apache/beam/sdks/v2/go/pkg/beam/x/debug"
"strconv"
"strings"
)
func less(a, b string) bool {
return true
}
func main() {
ctx := context.Background()
p, s := beam.NewPipelineWithRoot()
input := textio.Read(s, "gs://apache-beam-samples/game/small/gaming_data.csv")
lines := getLines(s, input)
kvPCollection := getSplitLineAsMap(s, lines)
combined := combine(s, kvPCollection)
debug.Print(s, combined)
err := beamx.Run(ctx, p)
if err != nil {
log.Exitf(context.Background(), "Failed to execute job: %v", err)
}
}
func getLines(s beam.Scope, input beam.PCollection) beam.PCollection {
return filter.Include(s, input, func(element string) bool {
return element != ""
})
}
func getSplitLineAsMap(s beam.Scope, input beam.PCollection) beam.PCollection {
c := 0
return beam.ParDo(s, func(line string, emit func(string, int)) {
if c == 100 {
return
}
c++
split := strings.Split(line, ",")
count, _ := strconv.Atoi(split[2])
emit(split[1], count)
}, input)
}
func combine(s beam.Scope, input beam.PCollection) beam.PCollection {
return beam.CombinePerKey(s, func(score1, score2 int) int {
return score1 + score2
}, input)
}