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package eu.dnetlib.msro.workflows.nodes;
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import javax.annotation.Resource;
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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.googlecode.sarasvati.Engine;
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import com.googlecode.sarasvati.NodeToken;
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import eu.dnetlib.enabling.is.lookup.rmi.ISLookUpService;
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import eu.dnetlib.enabling.tools.ServiceLocator;
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import eu.dnetlib.enabling.tools.blackboard.BlackboardClientHandler;
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import eu.dnetlib.enabling.tools.blackboard.BlackboardJob;
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import eu.dnetlib.enabling.tools.blackboard.BlackboardJobImpl;
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import eu.dnetlib.enabling.tools.blackboard.BlackboardJobRegistry;
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import eu.dnetlib.msro.workflows.nodes.blackboard.BlackboardWorkflowJobListener;
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import eu.dnetlib.msro.workflows.util.WorkflowsConstants;
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public abstract class BlackboardJobNode extends SarasvatiJobNode {
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@Resource(name="lookupLocator")
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private ServiceLocator<ISLookUpService> lookupLocator;
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/**
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* logger.
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*/
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private static final Log log = LogFactory.getLog(BlackboardJobNode.class); // NOPMD by marko on 11/24/08 5:02 PM
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/**
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* blackboard handler.
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*/
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@Resource
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private BlackboardClientHandler blackboardClientHandler;
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/**
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* blackboard job registry.
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*/
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@Resource
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private BlackboardJobRegistry jobRegistry;
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@Override
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public void execute(final Engine engine, final NodeToken token) {
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super.execute(engine, token);
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log.info("executing blackboard node");
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try {
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token.getEnv().setAttribute(WorkflowsConstants.BLACKBOARD_IS_BLACKBOARD, true);
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final String serviceId = lookupLocator.getService().getResourceProfileByQuery(getXqueryForServiceId(token));
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if (serviceId == null) {
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token.getEnv().setAttribute(WorkflowsConstants.SYSTEM_HAS_FAILED, true);
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token.getEnv().setAttribute(WorkflowsConstants.SYSTEM_ERROR, "cannot locate target service profile");
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engine.complete(token, "failed");
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return;
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}
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final BlackboardJob job = blackboardClientHandler.newJob(serviceId);
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token.getEnv().setTransientAttribute(WorkflowsConstants.BLACKBOARD_JOB, job);
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token.getEnv().setAttribute(WorkflowsConstants.BLACKBOARD_SERVICE_ID, ((BlackboardJobImpl) job).getServiceId());
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prepareJob(job, token);
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jobRegistry.registerJobListener(job, generateBlackboardListener(engine, token));
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blackboardClientHandler.assign(job);
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} catch (final Exception e) {
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token.getEnv().setAttribute(WorkflowsConstants.SYSTEM_HAS_FAILED, true);
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token.getEnv().setAttribute(WorkflowsConstants.SYSTEM_ERROR, "cannot prepare blackboard job: " + e);
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engine.complete(token, "failed");
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log.warn("cannot prepare blackboard job", e);
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}
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}
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abstract protected String getXqueryForServiceId(NodeToken token);
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abstract protected void prepareJob(final BlackboardJob job, final NodeToken token) throws Exception;
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protected BlackboardWorkflowJobListener generateBlackboardListener(final Engine engine, final NodeToken token) {
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return new BlackboardWorkflowJobListener(engine, token);
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}
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}
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