Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Revise WindowedWordCount for runner and execution mode portability
- Loading branch information
1 parent
088811d
commit e8e65db
Showing
3 changed files
with
320 additions
and
110 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
71 changes: 71 additions & 0 deletions
71
examples/java/src/main/java/org/apache/beam/examples/common/WriteWindowedFilesDoFn.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,71 @@ | ||
/* | ||
* 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. | ||
*/ | ||
package org.apache.beam.examples.common; | ||
|
||
import com.google.common.annotations.VisibleForTesting; | ||
import java.io.OutputStream; | ||
import java.nio.channels.Channels; | ||
import java.nio.charset.StandardCharsets; | ||
import org.apache.beam.sdk.coders.Coder; | ||
import org.apache.beam.sdk.coders.StringUtf8Coder; | ||
import org.apache.beam.sdk.transforms.DoFn; | ||
import org.apache.beam.sdk.transforms.windowing.IntervalWindow; | ||
import org.apache.beam.sdk.util.IOChannelFactory; | ||
import org.apache.beam.sdk.util.IOChannelUtils; | ||
import org.apache.beam.sdk.values.KV; | ||
import org.joda.time.format.DateTimeFormatter; | ||
import org.joda.time.format.ISODateTimeFormat; | ||
|
||
/** Created by klk on 11/4/16. */ | ||
public class WriteWindowedFilesDoFn | ||
extends DoFn<KV<IntervalWindow, Iterable<KV<String, Long>>>, Void> { | ||
|
||
static final byte[] NEWLINE = "\n".getBytes(StandardCharsets.UTF_8); | ||
static final Coder<String> STRING_CODER = StringUtf8Coder.of(); | ||
|
||
private static DateTimeFormatter formatter = ISODateTimeFormat.hourMinute(); | ||
|
||
private final String output; | ||
|
||
public WriteWindowedFilesDoFn(String output) { | ||
this.output = output; | ||
} | ||
|
||
@VisibleForTesting | ||
public static String fileForWindow(String output, IntervalWindow window) { | ||
return String.format( | ||
"%s-%s-%s", output, formatter.print(window.start()), formatter.print(window.end())); | ||
} | ||
|
||
@ProcessElement | ||
public void processElement(ProcessContext context) throws Exception { | ||
// Build a file name from the window | ||
IntervalWindow window = context.element().getKey(); | ||
String outputShard = fileForWindow(output, window); | ||
|
||
// Open the file and write all the values | ||
IOChannelFactory factory = IOChannelUtils.getFactory(outputShard); | ||
OutputStream out = Channels.newOutputStream(factory.create(outputShard, "text/plain")); | ||
for (KV<String, Long> wordCount : context.element().getValue()) { | ||
STRING_CODER.encode( | ||
wordCount.getKey() + ": " + wordCount.getValue(), out, Coder.Context.OUTER); | ||
out.write(NEWLINE); | ||
} | ||
out.close(); | ||
} | ||
} |
Oops, something went wrong.