/
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: setting-pipeline
// description: Setting pipeline example.
// multifile: false
// context_line: 34
// pipeline_options: --output output.txt
// categories:
// - Quickstart
// complexity: BASIC
// tags:
// - hellobeam
package main
import (
"context"
"flag"
"github.com/apache/beam/sdks/v2/go/pkg/beam/io/textio"
"github.com/apache/beam/sdks/v2/go/pkg/beam"
"github.com/apache/beam/sdks/v2/go/pkg/beam/log"
"github.com/apache/beam/sdks/v2/go/pkg/beam/x/beamx"
)
var (
// By default, this example reads from a public dataset containing the text of
// King Lear. Set this option to choose a different input file or glob.
input = flag.String("input", "gs://apache-beam-samples/shakespeare/kinglear.txt", "File(s) to read.")
// Set this required option to specify where to write the output.
output = flag.String("output", "", "Output file (required).")
)
func main() {
// If beamx or Go flags are used, flags must be parsed first.
flag.Parse()
ctx := context.Background()
// Input validation is done as usual. Note that it must be after Init().
if *output == "" {
log.Exitf(ctx,"No output provided")
}
p := beam.NewPipeline()
s := p.Root()
// Read from option input file
lines := textio.Read(s, *input)
// Write to option output file
textio.Write(s, *output, lines)
err := beamx.Run(ctx, p)
if err != nil {
log.Exitf(ctx, "Failed to execute job: %v", err)
}
}