mport java.io.IOException;

import java.util.StringTokenizer;

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.fs.Path;

import org.apache.hadoop.io.IntWritable;

import org.apache.hadoop.io.Text;

import org.apache.hadoop.mapreduce.Job;

import org.apache.hadoop.mapreduce.Mapper;

import org.apache.hadoop.mapreduce.Reducer;

import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;

import org.apache.hadoop.mapreduce.lib.jobcontrol.ControlledJob;

import org.apache.hadoop.mapreduce.lib.jobcontrol.JobControl;

import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

import org.apache.hadoop.util.GenericOptionsParser;

public class Driver {

    public static class TokenizerMapper extends

            Mapper<Object, Text, Text, IntWritable> {

        private final static IntWritable one = new IntWritable(1);

        private Text word = new Text();

        public void map(Object key, Text value, Context context)

                throws IOException, InterruptedException {

            StringTokenizer itr = new StringTokenizer(value.toString());

            while (itr.hasMoreTokens()) {

                word.set(itr.nextToken());

                context.write(word, one);

            }

        }

    }

    public static class IntSumReducer extends

            Reducer<Text, IntWritable, Text, IntWritable> {

        private IntWritable result = new IntWritable();

        public void reduce(Text key, Iterable<IntWritable> values,

                Context context) throws IOException, InterruptedException {

            int sum = 0;

            for (IntWritable val : values) {

                sum += val.get();

            }

            result.set(sum);

            context.write(key, result);

        }

    }

    public static class DependenceMapper extends

            Mapper<Object, Text, Text, Text> {

        private Text word = new Text();

        public void map(Object key, Text value, Context context)

                throws IOException, InterruptedException {

            String []sep=value.toString().split("\t");

            word.set(sep[1]+"\t"+sep[0]);

            System.out.println(value.toString());

            context.write(word,new Text(""));

        }

    }

    public static class DependenceReducer extends

            Reducer<Text,Text,Text,Text> {

        public void reduce(Text key, Iterable<Text> values,

                Context context) throws IOException, InterruptedException {

            String[] sep = key.toString().split("\t");

            System.out.println( sep[0]+"++++++++="+ sep[1]);

            context.write(key,new Text(""));

        }

    }

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

        Configuration conf = new Configuration();

        String[] otherArgs = new GenericOptionsParser(conf, args)

                .getRemainingArgs();

        if (otherArgs.length < 2) {

            System.err.println("Usage: wordcount <in> <out>");

            System.exit(2);

        }

        Job job = new Job(conf, "word count");

        //加入控制容器

        ControlledJob ctrljob1=new  ControlledJob(conf);

        ctrljob1.setJob(job);

        job.setJarByClass(Driver.class);

        job.setMapperClass(TokenizerMapper.class);

        job.setCombinerClass(IntSumReducer.class);

        job.setReducerClass(IntSumReducer.class);

        job.setOutputKeyClass(Text.class);

        job.setOutputValueClass(IntWritable.class);

        FileInputFormat.addInputPath(job, new Path(otherArgs[0]));

        FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));

//        job.waitForCompletion(true);

        Configuration conf2 = new Configuration();

        Job job2 = new Job(conf2, "word count1");

         ControlledJob ctrljob2=new ControlledJob(conf);

            ctrljob2.setJob(job2);

            ctrljob2.addDependingJob(ctrljob1);

        job2.setJarByClass(Driver.class);

        job2.setMapperClass(DependenceMapper.class);

        job2.setReducerClass(DependenceReducer.class);

        job2.setOutputKeyClass(Text.class);

        job2.setOutputValueClass(Text.class);

        FileInputFormat.addInputPath(job2, new Path(otherArgs[1]));

        FileOutputFormat.setOutputPath(job2, new Path(otherArgs[2]));

    //    job2.waitForCompletion(true);

          JobControl jobCtrl=new JobControl("myctrl");

          

            //添加到总的JobControl里，进行控制

            jobCtrl.addJob(ctrljob1);

            jobCtrl.addJob(ctrljob2);

            jobCtrl.run();

            

    }

}