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package eu.dnetlib.data.hadoop.action;
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import java.io.IOException;
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import org.apache.commons.lang.StringUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.io.SequenceFile;
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import org.apache.hadoop.io.Text;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.beans.factory.annotation.Required;
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import eu.dnetlib.data.hadoop.config.ClusterName;
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import eu.dnetlib.data.hadoop.config.ConfigurationEnumerator;
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import eu.dnetlib.data.hadoop.hdfs.SequenceFileWriterFactory;
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import eu.dnetlib.enabling.resultset.client.ResultSetClientFactory;
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public class SequenceFileFeeder {
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private static final Log log = LogFactory.getLog(SequenceFileFeeder.class); // NOPMD by marko on 11/24/08 5:02 PM
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private ResultSetClientFactory resultSetClientFactory;
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@Autowired
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protected ConfigurationEnumerator configurationEnumerator;
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@Autowired
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protected SequenceFileWriterFactory sequenceFileWriterFactory;
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public int feed(final String epr, final ClusterName clusterName, final String path) throws IOException {
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return doWrite(epr, clusterName, path);
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}
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private int doWrite(final String epr, final ClusterName clusterName, final String path) throws IOException {
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final SequenceFile.Writer writer = sequenceFileWriterFactory.getSequenceFileWriter(Text.class, Text.class, getConf(clusterName), new Path(path));
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log.info("Opened sequence file writer: " + writer.toString());
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try {
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final Text idText = new Text();
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final Text bodyText = new Text();
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int count = 0;
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int nulls = 0;
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for (String record : getResultSetClientFactory().getClient(epr)) {
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if (StringUtils.isBlank(record)) {
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nulls++;
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} else {
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idText.set(String.valueOf(count++));
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bodyText.set(record);
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writer.append(idText, bodyText);
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}
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}
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log.info("written " + count + " records in sequence file: " + path);
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if (nulls > 0) {
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log.warn("found " + nulls + " records in epr!");
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}
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return count;
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} finally {
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writer.close();
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}
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}
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protected Configuration getConf(final ClusterName clusterName) {
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return configurationEnumerator.get(clusterName);
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}
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public ResultSetClientFactory getResultSetClientFactory() {
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return resultSetClientFactory;
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}
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@Required
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public void setResultSetClientFactory(final ResultSetClientFactory resultSetClientFactory) {
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this.resultSetClientFactory = resultSetClientFactory;
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}
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}
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