forked from D-Net/dnet-hadoop
88 lines
2.4 KiB
Java
88 lines
2.4 KiB
Java
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package eu.dnetlib.dhp.oa.graph.raw.common;
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import java.io.Closeable;
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import java.io.IOException;
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import java.util.concurrent.atomic.AtomicInteger;
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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 com.fasterxml.jackson.databind.ObjectMapper;
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import eu.dnetlib.dhp.schema.oaf.Oaf;
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public class AbstractMigrationApplication implements Closeable {
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private final AtomicInteger counter = new AtomicInteger(0);
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private final Text key = new Text();
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private final Text value = new Text();
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private final SequenceFile.Writer writer;
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private final ObjectMapper objectMapper = new ObjectMapper();
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private static final Log log = LogFactory.getLog(AbstractMigrationApplication.class);
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protected AbstractMigrationApplication() { // ONLY FOR UNIT TEST
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this.writer = null;
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}
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public AbstractMigrationApplication(final String hdfsPath) throws Exception {
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log.info(String.format("Creating SequenceFile Writer, hdfsPath=%s", hdfsPath));
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this.writer = SequenceFile
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.createWriter(
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getConf(),
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SequenceFile.Writer.file(new Path(hdfsPath)),
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SequenceFile.Writer.keyClass(Text.class),
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SequenceFile.Writer.valueClass(Text.class));
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}
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private Configuration getConf() throws IOException {
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final Configuration conf = new Configuration();
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/*
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* conf.set("fs.defaultFS", hdfsNameNode); conf.set("fs.hdfs.impl",
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* org.apache.hadoop.hdfs.DistributedFileSystem.class.getName()); conf.set("fs.file.impl",
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* org.apache.hadoop.fs.LocalFileSystem.class.getName()); System.setProperty("HADOOP_USER_NAME", hdfsUser);
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* System.setProperty("hadoop.home.dir", "/"); FileSystem.get(URI.create(hdfsNameNode), conf);
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*/
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return conf;
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}
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protected void emit(final String s, final String type) {
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try {
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key.set(counter.getAndIncrement() + ":" + type);
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value.set(s);
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writer.append(key, value);
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} catch (final Exception e) {
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throw new RuntimeException(e);
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}
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}
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protected void emitOaf(final Oaf oaf) {
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try {
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emit(objectMapper.writeValueAsString(oaf), oaf.getClass().getSimpleName().toLowerCase());
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} catch (final Exception e) {
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throw new RuntimeException(e);
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}
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}
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public ObjectMapper getObjectMapper() {
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return objectMapper;
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}
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@Override
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public void close() throws IOException {
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writer.hflush();
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writer.close();
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}
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}
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