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package eu.dnetlib.msro.workflows.resultset;
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import java.util.List;
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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 com.google.common.collect.Lists;
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import com.googlecode.sarasvati.GraphProcess;
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import eu.dnetlib.enabling.resultset.ResultSet;
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import eu.dnetlib.enabling.resultset.ResultSetAware;
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import eu.dnetlib.enabling.resultset.ResultSetListener;
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import eu.dnetlib.enabling.resultset.rmi.ResultSetException;
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import eu.dnetlib.enabling.resultset.rmi.ResultSetService;
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public class ProcessCountingResultSetListener implements ResultSetListener, ResultSetAware {
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private int count;
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private GraphProcess process;
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private ResultSetService inputService;
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private String inputRsId;
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private ResultSet outputResulset;
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private int inputSize;
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private boolean inaccurate = false;
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private final static String RS_CLOSED = "closed";
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/**
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* Logger.
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*/
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private static final Log log = LogFactory.getLog(ProcessCountingResultSetListener.class);
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public ProcessCountingResultSetListener(final GraphProcess process, final ResultSetService inputService, final String inputRsId) throws ResultSetException {
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super();
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this.process = process;
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this.inputService = inputService;
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this.inputRsId = inputRsId;
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this.inputSize = inputService.getNumberOfElements(inputRsId);
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this.count = 0;
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}
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@Override
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public List<String> getResult(final int from, final int to) {
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if (process.isCanceled()) {
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this.outputResulset.close();
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return Lists.newArrayList();
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}
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try {
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this.count = to;
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if (count >= this.inputSize) {
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closeRSIfNeeded();
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}
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return inputService.getResult(inputRsId, from, to, "WAITING");
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} catch (ResultSetException e) {
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log.error("Error fetching records from resultset: " + inputRsId);
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throw new RuntimeException(e);
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}
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}
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@Override
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public int getSize() {
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if (process.isCanceled()) {
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this.outputResulset.close();
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return count;
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}
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try {
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int size = inputService.getNumberOfElements(inputRsId);
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if (this.inputSize != size) {
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this.inputSize = size;
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this.inaccurate = true;
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}
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this.inputSize = size;
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if (count >= this.inputSize) {
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closeRSIfNeeded();
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this.inaccurate = false;
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}
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return this.inputSize;
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} catch (ResultSetException e) {
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log.error("Error fetching records from resultset: " + inputRsId);
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throw new RuntimeException(e);
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}
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}
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private void closeRSIfNeeded() throws ResultSetException {
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if (inputService.getProperty(inputRsId, "classSimpleName").equalsIgnoreCase("TransientPushResultSetImpl")) {
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log.info("Not closing the counting resultset unless the underlying push result is already closed ");
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if (inputService.getRSStatus(inputRsId).equals(RS_CLOSED)) {
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outputResulset.close();
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}
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} else {
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outputResulset.close();
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}
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}
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@Override
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public void setResultSet(final ResultSet outputResulset) {
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this.outputResulset = outputResulset;
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}
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public int getCount() {
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return count;
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}
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public void setCount(final int count) {
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this.count = count;
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}
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public boolean isInaccurate() {
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return inaccurate;
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}
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}
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