CustomResource.java

package org.kie.server.ext.drools.rest;

import static org.kie.server.remote.rest.common.util.RestUtils.createResponse;
import static org.kie.server.remote.rest.common.util.RestUtils.getContentType;
import static org.kie.server.remote.rest.common.util.RestUtils.getVariant;

import java.util.ArrayList;
import java.util.List;

import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Variant;

import org.kie.api.KieServices;
import org.kie.api.command.BatchExecutionCommand;
import org.kie.api.command.Command;
import org.kie.api.command.KieCommands;
import org.kie.api.runtime.ExecutionResults;
import org.kie.server.api.marshalling.Marshaller;
import org.kie.server.api.marshalling.MarshallingFormat;
import org.kie.server.services.api.KieContainerInstance;
import org.kie.server.services.api.KieServerRegistry;
import org.kie.server.services.drools.RulesExecutionService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Path("server/containers/instances/{id}/ksession")
public class CustomResource {

    private static final Logger logger = LoggerFactory.getLogger(CustomResource.class);
    
    private KieCommands commandsFactory = KieServices.Factory.get().getCommands();

    private RulesExecutionService rulesExecutionService;
    private KieServerRegistry registry;

    public CustomResource() {

    }

    public CustomResource(RulesExecutionService rulesExecutionService, KieServerRegistry registry) {
        this.rulesExecutionService = rulesExecutionService;
        this.registry = registry;
    }
    
    @POST
    @Path("/{ksessionId}")
    @Consumes({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    @Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    public Response insertFireReturn(@Context HttpHeaders headers, 
            @PathParam("id") String id, 
            @PathParam("ksessionId") String ksessionId, 
            String cmdPayload) {

        Variant v = getVariant(headers);
        String contentType = getContentType(headers);
        
        MarshallingFormat format = MarshallingFormat.fromType(contentType);
        if (format == null) {
            format = MarshallingFormat.valueOf(contentType);
        }
        try {    
            KieContainerInstance kci = registry.getContainer(id);
            
            Marshaller marshaller = kci.getMarshaller(format);
            
            List<?> listOfFacts = marshaller.unmarshall(cmdPayload, List.class);
            
            List<Command<?>> commands = new ArrayList<Command<?>>();
            BatchExecutionCommand executionCommand = commandsFactory.newBatchExecution(commands, ksessionId);
            
            for (Object fact : listOfFacts) {
                commands.add(commandsFactory.newInsert(fact, fact.toString()));
            }
            commands.add(commandsFactory.newFireAllRules());
            commands.add(commandsFactory.newGetObjects());
                
            ExecutionResults results = rulesExecutionService.call(kci, executionCommand);
                    
            String result = marshaller.marshall(results);
            
            
            logger.debug("Returning OK response with content '{}'", result);
            return createResponse(result, v, Response.Status.OK);
        } catch (Exception e) {
            // in case marshalling failed return the call container response to keep backward compatibility
            String response = "Execution failed with error : " + e.getMessage();
            logger.debug("Returning Failure response with content '{}'", response);
            return createResponse(response, v, Response.Status.INTERNAL_SERVER_ERROR);
        }

    }
}