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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: TriggersSolution
// description: TriggersSolution example.
// multifile: false
// context_line: 46
// 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/core/graph/window/trigger"
"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/x/beamx"
"strconv"
"strings"
"time"
)
func main() {
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)
trigger := trigger.AfterAll([]trigger.Trigger{trigger.AfterCount(10), trigger.AfterEndOfWindow().
EarlyFiring(trigger.AfterProcessingTime().
PlusDelay(60 * time.Second)).
LateFiring(trigger.Repeat(trigger.AfterCount(1)))})
fixedWindowedItems := beam.WindowInto(s, window.NewFixedWindows(60*time.Second), cost, beam.Trigger(trigger), beam.PanesDiscard())
output(s, fixedWindowedItems)
err := beamx.Run(context.Background(), 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)
}
func output(s beam.Scope, input beam.PCollection) {
beam.ParDo0(s, func(element interface{}) {
fmt.Println(element)
}, input)
}