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package eu.dnetlib.data.hadoop;
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import java.util.Date;
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import java.util.List;
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import java.util.Map;
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import java.util.Map.Entry;
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import eu.dnetlib.rmi.data.hadoop.ClusterName;
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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.springframework.beans.factory.annotation.Required;
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import com.google.common.collect.BiMap;
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import com.google.common.collect.HashBiMap;
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import com.google.common.collect.Iterables;
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import com.google.common.collect.Lists;
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import com.google.common.collect.Maps;
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import eu.dnetlib.data.hadoop.HadoopJob.Status;
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import eu.dnetlib.rmi.data.hadoop.HadoopJobDescriptor;
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import eu.dnetlib.rmi.data.hadoop.HadoopServiceException;
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import eu.dnetlib.data.hadoop.utils.HadoopUtils;
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public class JobRegistry {
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private static final Log log = LogFactory.getLog(JobRegistry.class); // NOPMD by marko on 11/24/08 5:02 PM
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private int maxJobs;
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private final BiMap<String, HadoopJob> jobs = HashBiMap.create();
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public String registerJob(HadoopJob hadoopJob) throws HadoopServiceException {
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if (jobs.containsValue(hadoopJob)) { return jobs.inverse().get(hadoopJob); }
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if (jobs.size() > getMaxJobs()) {
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removeOldestProcess();
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}
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jobs.put(hadoopJob.getId(), hadoopJob);
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log.info("Registered hadoop job " + hadoopJob.getId());
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hadoopJob.startMonitor();
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return hadoopJob.getId();
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}
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public Status getJobStatus(String id) {
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return findJob(id).getStatus();
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}
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public HadoopJob findJob(String id) {
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return jobs.get(id);
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}
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public void unregisterJob(String id) throws HadoopServiceException {
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if (!jobs.containsKey(id)) { throw new HadoopServiceException("unable to unregister job, could not find jobId in registry: " + id); }
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log.info("unregistering job: " + id);
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jobs.get(id).getJobMonitor().kill();
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jobs.remove(id);
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}
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private void removeOldestProcess() throws HadoopServiceException {
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Date oldDate = new Date();
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String oldId = null;
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for (Entry<String, HadoopJob> e : jobs.entrySet()) {
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final HadoopJob hadoopJob = e.getValue();
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if (hadoopJob.isComplete()) {
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final Date date = hadoopJob.getLastActivity();
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if (date.before(oldDate)) {
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oldDate = date;
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oldId = e.getKey();
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}
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}
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}
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if (oldId != null) {
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unregisterJob(oldId);
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}
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}
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public List<HadoopJobDescriptor> listJobs(ClusterName clusterName) {
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Map<String, HadoopJob> filtered = Maps.filterValues(jobs, HadoopUtils.filterByCluster(clusterName));
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return Lists.newArrayList(Iterables.transform(filtered.entrySet(), HadoopUtils.hadoopJobDescriptor()));
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}
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@Required
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public void setMaxJobs(final int maxJobs) {
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this.maxJobs = maxJobs;
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}
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public int getMaxJobs() {
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return maxJobs;
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}
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}
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