apache beam Events By Location - Java Big Data

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Description

apache beam Events By Location

Demo Code

/*//w  w  w.j av  a2s .c  o m
 * 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.samples;

import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.io.TextIO;
import org.apache.beam.sdk.options.*;
import org.apache.beam.sdk.transforms.*;
import org.apache.beam.sdk.values.KV;
import org.apache.beam.sdk.values.PCollection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.text.SimpleDateFormat;
import java.util.Date;

public class EventsByLocation {

    private static final Logger LOG = LoggerFactory
            .getLogger(EventsByLocation.class);

    /**
     * Specific pipeline options.
     */
    private interface Options extends PipelineOptions {
        String GDELT_EVENTS_URL = "http://data.gdeltproject.org/events/";

        @Description("GDELT file date")
        @Default.InstanceFactory(GDELTFileFactory.class)
        String getDate();

        void setDate(String value);

        @Description("Input Path")
        String getInput();

        void setInput(String value);

        @Description("Output Path")
        String getOutput();

        void setOutput(String value);

        class GDELTFileFactory implements DefaultValueFactory<String> {
            public String create(PipelineOptions options) {
                SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
                return format.format(new Date());
            }
        }
    }

    private static String getCountry(String row) {
        String[] fields = row.split("\\t+");
        if (fields.length > 22) {
            if (fields[21].length() > 2) {
                return fields[21].substring(0, 1);
            }
            return fields[21];
        }
        return "NA";
    }

    public static void main(String[] args) throws Exception {

        Options options = PipelineOptionsFactory.fromArgs(args)
                .withValidation().as(Options.class);
        if (options.getInput() == null) {
            options.setInput(Options.GDELT_EVENTS_URL + options.getDate()
                    + ".export.CSV.zip");
        }
        if (options.getOutput() == null) {
            options.setOutput("/tmp/gdelt-" + options.getDate());
        }
        LOG.info(options.toString());

        Pipeline pipeline = Pipeline.create(options);
        PCollection<String> read = pipeline.apply("ReadFromGDELTFile",
                TextIO.Read.from(options.getInput())).apply("TakeASample",
                Sample.<String> any(10));
        read.apply(ParDo.of(new DoFn<String, Void>() {
            @ProcessElement
            public void processElement(ProcessContext c) {
                LOG.info(String.format("READ C.ELEMENT |%s|", c.element()));
            }
        }));

        read.apply("ExtractLocation", ParDo.of(new DoFn<String, String>() {
            @ProcessElement
            public void processElement(ProcessContext c) {
                c.output(getCountry(c.element()));
            }
        }))
                .apply("FilterValidLocations",
                        Filter.by(new SerializableFunction<String, Boolean>() {
                            public Boolean apply(String input) {
                                return (!input.equals("NA")
                                        && !input.startsWith("-") && input
                                        .length() == 2);
                            }
                        }))
                .apply("CountByLocation", Count.<String> perElement())
                .apply("ConvertToJson",
                        MapElements
                                .via(new SimpleFunction<KV<String, Long>, String>() {
                                    public String apply(
                                            KV<String, Long> input) {
                                        return "{\"" + input.getKey()
                                                + "\": " + input.getValue()
                                                + "}";
                                    }
                                }))
                .apply("WriteResults", TextIO.Write.to(options.getOutput()));

        pipeline.run();
    }

}

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