D-Net

package eu.dnetlib.data.mapreduce.hbase.dataimport;

import java.io.IOException;

import java.lang.reflect.Type;

import java.util.Map;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.apache.hadoop.hbase.client.Put;

import org.apache.hadoop.hbase.io.ImmutableBytesWritable;

import org.apache.hadoop.hbase.util.Bytes;

import org.apache.hadoop.io.Text;

import org.apache.hadoop.mapreduce.Mapper;

import com.google.common.collect.Maps;

import com.google.gson.Gson;

import com.google.gson.reflect.TypeToken;

import eu.dnetlib.data.mapreduce.JobParams;

import eu.dnetlib.data.transform.Column;

import eu.dnetlib.data.transform.Row;

import eu.dnetlib.data.transform.XsltRowTransformer;

import eu.dnetlib.data.transform.XsltRowTransformerFactory;

public class ImportRecordsMapper extends Mapper<Text, Text, ImmutableBytesWritable, Put> {

	/**

	 * logger.

	 */

	private static final Log log = LogFactory.getLog(ImportRecordsMapper.class); // NOPMD by marko on 11/24/08 5:02 PM

	private static final boolean WRITE_TO_WAL = false;

	private XsltRowTransformer transformer;

	private ImmutableBytesWritable ibw;

	@Override

	protected void setup(final Context context) throws IOException, InterruptedException {

		super.setup(context);

		final String xslt = context.getConfiguration().get(JobParams.HBASE_IMPORT_XSLT).trim();

		if ((xslt == null) || xslt.isEmpty()) throw new IllegalArgumentException("missing xslt");

		final Map<String, Object> xslParams = Maps.newHashMap();

		if (context.getConfiguration().get("datasourceTypeMap") != null) {

			final Map<String, String> dsMap = getDatasourceTypeMap(context);

			log.info("using datasource type map:\n" + dsMap.toString());

			xslParams.put("mergeIdForHomonymsMap", dsMap);

		}

		transformer = XsltRowTransformerFactory.newInstance(xslt, xslParams);

		ibw = new ImmutableBytesWritable();

		log.info("got xslt: '" + xslt);

		log.info("using trasformer: '" + transformer.getTransformerClassName() + "'");

	}

	@Override

	protected void map(final Text key, final Text value, final Context context) throws IOException, InterruptedException {

		try {

			for (final Row row : transformer.apply(value.toString())) {

				final byte[] rowKey = Bytes.toBytes(row.getKey());

				final Put put = new Put(rowKey);

				put.setWriteToWAL(WRITE_TO_WAL);

				for (final Column<String, byte[]> col : row) {

					final byte[] family = Bytes.toBytes(row.getColumnFamily());

					final byte[] qualifier = Bytes.toBytes(col.getName());

					put.add(family, qualifier, col.getValue());

					context.getCounter("mdstore", row.getColumnFamily()).increment(1);

				}

				ibw.set(rowKey);

				context.write(ibw, put);

			}

		} catch (final Throwable e) {

			log.error("error importing the following record on HBase: " + value.toString(), e);

			context.getCounter("error", e.getClass().getName()).increment(1);

			throw new RuntimeException(e);

		}

	}

	private Map<String, String> getDatasourceTypeMap(final Context context) {

		final String dsType = context.getConfiguration().get("datasourceTypeMap");

		final Type token = new TypeToken<Map<String, String>>() {}.getType();

		final Map<String, String> dsMap = new Gson().fromJson(dsType, token);

		return dsMap;

	}

}