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package eu.dnetlib.msro.openaireplus.workflows.nodes.index;
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import java.util.Queue;
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import com.googlecode.sarasvati.Arc;
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import com.googlecode.sarasvati.NodeToken;
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import eu.dnetlib.msro.rmi.MSROException;
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import eu.dnetlib.msro.workflows.nodes.SimpleJobNode;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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/**
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* SwitchIndexesJobNode guides the index switches on all search services whose ids are in the queue available in the parameter named 'searchService_ids'.
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*
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* @author claudio, alessia
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* @see eu.dnetlib.msro.openaireplus.workflows.nodes.index.FindSearchServicesJobNode
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* @see eu.dnetlib.msro.openaireplus.workflows.nodes.index.SwitchIndexJobNode
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*/
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public class SwitchIndexesJobNode extends SimpleJobNode {
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private static final Log log = LogFactory.getLog(SwitchIndexesJobNode.class);
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@Override
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protected String execute(final NodeToken token) throws Exception {
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Queue<String> q = (Queue<String>) token.getEnv().getTransientAttribute("searchService_ids");
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log.debug("Got the searchService_ids queue: " + q.toString());
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if (q == null) throw new MSROException("Transient param 'searchService_ids' with queue of string could not be found");
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if (q.isEmpty()) {
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log.info("searchService_ids queue consumed, now ending cycle");
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return Arc.DEFAULT_ARC;
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} else {
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//we have something to do: setting the xqueryForServiceIdParam for the SwitchIndexJobNode
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String id = q.poll();
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log.debug("Polled id: " + id);
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log.debug("And now the queue is " + q);
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token.getEnv().setAttribute("search_service_ID", id);
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log.debug("Asking to switch on profile with id: " + id);
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//updating the queue for next iteration
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token.getEnv().setTransientAttribute("searchService_ids", q);
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return "switch";
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}
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}
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}
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