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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: text-io-local-read
// description: TextIO read local file example.
// multifile: true
// files:
// - name: myfile.txt
// context_line: 30
// categories:
// - Quickstart
// complexity: MEDIUM
// tags:
// - hellobeam
package main
import (
"regexp"
"github.com/apache/beam/sdks/v2/go/pkg/beam"
"github.com/apache/beam/sdks/v2/go/pkg/beam/io/textio"
"context"
"github.com/apache/beam/sdks/v2/go/pkg/beam/log"
"github.com/apache/beam/sdks/v2/go/pkg/beam/x/beamx"
)
var wordRE = regexp.MustCompile(`[a-zA-Z]+('[a-z])?`)
func main() {
p, s := beam.NewPipelineWithRoot()
input := textio.Read(s, "myfile.txt")
beam.ParDo(s, func(line string, emit func(string)) {
for _, word := range wordRE.FindAllString(line, -1) {
emit(word)
}
}, input)
err := beamx.Run(context.Background(), p)
if err != nil {
log.Exitf(context.Background(), "Failed to execute job: %v", err)
}
}