com.datasayer.meerkat.TestMeerkatMain.java Source code

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Here is the source code for com.datasayer.meerkat.TestMeerkatMain.java

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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.
 */
package com.datasayer.meerkat;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Iterator;
import java.util.Random;

import junit.framework.TestCase;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hama.HamaConfiguration;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class TestMeerkatMain extends TestCase {
    private static final Log LOG = LogFactory.getLog(TestMeerkatMain.class);
    private final int maxWord = 1000;
    private final String testLogFileName = "./meerkat.log";

    public static class ObserverMeers extends GuardMeer<IntWritable> {
        @Override
        public void observe(String line) {
            try {
                this.sendToBoss(new IntWritable(line.length()));
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static class FindMaxLength extends BossMeer<IntWritable, Text> {
        private int maxLineLength = 0;

        @Override
        public void masterCompute(Iterator<IntWritable> values, SignalMeer<Text> signalMeer) {

            while (values.hasNext()) {
                int currValue = values.next().get();
                if (maxLineLength < currValue) {
                    maxLineLength = currValue;
                }
            }
            System.out.println("find max : " + maxLineLength);

            signalMeer.setResult(new Text("Current max length of line is :" + maxLineLength));
        }

    }

    private String randomString(final int length) {
        Random r = new Random();
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            char c = (char) (r.nextInt((int) (Character.MAX_VALUE)));
            sb.append(c);
        }
        sb.append(System.lineSeparator());
        return sb.toString();
    }

    @Before
    public void setUp() throws Exception {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    String randomWord = "";

                    for (int a = 1; a <= maxWord; a++) {
                        randomWord = randomString(a);
                        LOG.info(randomWord);
                        Thread.sleep(20);
                    }
                    /*
                    File testLogFile = new File(testLogFileName);
                    if(testLogFile.exists()) {
                      testLogFile.delete();
                    }else{
                      testLogFile.createNewFile();
                    }
                    OutputStreamWriter writer;
                    for(int a=1;a<=maxWord;a++) {
                      writer = new OutputStreamWriter(new FileOutputStream(testLogFile, true), "UTF-8"); 
                      randomWord = randomString(a);
                      writer.write(randomWord);
                      writer.close();
                          
                      //System.out.println(randomWord.length());
                      Thread.sleep(100);
                      // print out string size will be 101
                      // (100 string + lineSeparator)
                      // but file reader will be remove lineSeparator
                    }
                    */
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }

    @Test
    public void test() throws Exception {
        //fail("Not yet implemented");
        // Job launcher
        HamaConfiguration conf = new HamaConfiguration();
        MeerJob testJob = null;
        try {
            testJob = new MeerJob(conf);
            testJob.setLogPath(new Path(testLogFileName));
            testJob.setGuardMeerClass(ObserverMeers.class);
            testJob.setBossMeerClass(FindMaxLength.class);
            testJob.setSignalMeerClass(TextSignalMeer.class);

            testJob.setBossAggregationInterval(1000);
            testJob.setSignalServer(true);
            testJob.waitForCompletion(false);
            //testJob.submit();
        } catch (IOException e) {
            e.printStackTrace();
        } /*
          catch (ClassNotFoundException e) {
           e.printStackTrace();
          } catch (InterruptedException e) {
           e.printStackTrace();
          }
          */

        // Client-side
        /*
        TextSignalMeer client = new TextSignalMeer(conf);
        while (true) {
          System.out.println(client.getLatestResult());
        }
        */
    }

    @After
    public void tearDown() throws Exception {
        HamaConfiguration conf = new HamaConfiguration();
        FileSystem fs = FileSystem.get(conf);
        fs.delete(new Path(testLogFileName), true);
    }
}