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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 org.apache.sysml.runtime.io;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.JobConf;

import org.apache.sysml.conf.DMLConfig;
import org.apache.sysml.hops.OptimizerUtils;
import org.apache.sysml.runtime.controlprogram.parfor.stat.InfrastructureAnalyzer;
import org.apache.sysml.runtime.matrix.data.IJV;
import org.apache.sysml.runtime.matrix.data.MatrixBlock;
import org.apache.sysml.runtime.matrix.data.OutputInfo;
import org.apache.sysml.runtime.matrix.data.SparseRowsIterator;
import org.apache.sysml.runtime.util.MapReduceTool;

public class WriterTextCellParallel extends WriterTextCell
{
	/**
	 * 
	 * @param path
	 * @param job
	 * @param src
	 * @param rlen
	 * @param clen
	 * @param brlen
	 * @param bclen
	 * @throws IOException
	 */
	@Override
	protected void writeTextCellMatrixToHDFS( Path path, JobConf job, MatrixBlock src, long rlen, long clen )
		throws IOException
	{
		//estimate output size and number of output blocks (min 1)
		int numPartFiles = (int)(OptimizerUtils.estimateSizeTextOutput(src.getNumRows(), src.getNumColumns(), src.getNonZeros(), 
				              OutputInfo.TextCellOutputInfo)  / InfrastructureAnalyzer.getHDFSBlockSize());
		numPartFiles = Math.max(numPartFiles, 1);
		
		//determine degree of parallelism
		int numThreads = OptimizerUtils.getParallelTextWriteParallelism();
		numThreads = Math.min(numThreads, numPartFiles);
		
		//fall back to sequential write if dop is 1 (e.g., <128MB) in order to create single file
		if( numThreads <= 1 ) {
			super.writeTextCellMatrixToHDFS(path, job, src, rlen, clen);
			return;
		}
		
		//create directory for concurrent tasks
		MapReduceTool.createDirIfNotExistOnHDFS(path.toString(), DMLConfig.DEFAULT_SHARED_DIR_PERMISSION);

		//create and execute tasks
		try 
		{
			ExecutorService pool = Executors.newFixedThreadPool(numThreads);
			ArrayList tasks = new ArrayList();
			int blklen = (int)Math.ceil((double)rlen / numThreads);
			for(int i=0; i> rt = pool.invokeAll(tasks);	
			pool.shutdown();
			
			//check for exceptions 
			for( Future task : rt )
				task.get();
		} 
		catch (Exception e) {
			throw new IOException("Failed parallel write of text output.", e);
		}
	}

	
	/**
	 * 
	 * 
	 */
	private static class WriteTextTask implements Callable 
	{
		private JobConf _job = null;
		private MatrixBlock _src = null;
		private Path _path =null;
		private int _rl = -1;
		private int _ru = -1;
		
		public WriteTextTask(Path path, JobConf job, MatrixBlock src, int rl, int ru)
		{
			_path = path;
			_job = job;
			_src = src;
			_rl = rl;
			_ru = ru;
		}

		@Override
		public Object call() throws Exception 
		{
			boolean entriesWritten = false;
			FileSystem fs = FileSystem.get(_job);
			BufferedWriter bw = null;			
			int cols = _src.getNumColumns();

			try
			{
				//for obj reuse and preventing repeated buffer re-allocations
				StringBuilder sb = new StringBuilder();
		        bw = new BufferedWriter(new OutputStreamWriter(fs.create(_path,true)));
				
				if( _src.isInSparseFormat() ) //SPARSE
				{			   
					SparseRowsIterator iter = _src.getSparseRowsIterator(_rl, _ru);
					
					while( iter.hasNext() )
					{
						IJV cell = iter.next();

						sb.append(cell.i+1);
						sb.append(' ');
						sb.append(cell.j+1);
						sb.append(' ');
						sb.append(cell.v);
						sb.append('\n');
						bw.write( sb.toString() );
						sb.setLength(0); 
						entriesWritten = true;
					}
				}
				else //DENSE
				{
					for( int i=_rl; i<_ru; i++ )
					{
						String rowIndex = Integer.toString(i+1);					
						for( int j=0; j 















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