Examples with TexeraWebException edu.uci.ics.texera.web.TexeraWebException used on opensource projects

Example 6 with TexeraWebException

use of edu.uci.ics.texera.web.TexeraWebException in project textdb by TextDB.

the class QueryPlanResource method executeQueryPlan.

/**
 * This is the edu.uci.ics.texera.web.request handler for the execution of a Query Plan.
 * @param logicalPlanJson, the json representation of the logical plan
 * @return - Generic TexeraWebResponse object
 */
@POST
@Path("/execute")
public // TODO: investigate how to use LogicalPlan directly
JsonNode executeQueryPlan(String logicalPlanJson) {
    try {
        LogicalPlan logicalPlan = new ObjectMapper().readValue(logicalPlanJson, LogicalPlan.class);
        Plan plan = logicalPlan.buildQueryPlan();
        ISink sink = plan.getRoot();
        // send response back to frontend
        if (sink instanceof TupleSink) {
            TupleSink tupleSink = (TupleSink) sink;
            tupleSink.open();
            List<Tuple> results = tupleSink.collectAllTuples();
            tupleSink.close();
            // make sure result directory is created
            if (Files.notExists(resultDirectory)) {
                Files.createDirectories(resultDirectory);
            }
            // clean up old result files
            cleanupOldResults();
            // generate new UUID as the result id
            String resultID = UUID.randomUUID().toString();
            // write original json of the result into a file
            java.nio.file.Path resultFile = resultDirectory.resolve(resultID + ".json");
            Files.createFile(resultFile);
            Files.write(resultFile, new ObjectMapper().writeValueAsBytes(results));
            // put readable json of the result into response
            ArrayNode resultNode = new ObjectMapper().createArrayNode();
            for (Tuple tuple : results) {
                resultNode.add(tuple.getReadableJson());
            }
            ObjectNode response = new ObjectMapper().createObjectNode();
            response.put("code", 0);
            response.set("result", resultNode);
            response.put("resultID", resultID);
            return response;
        } else {
            // execute the plan and return success message
            Engine.getEngine().evaluate(plan);
            ObjectNode response = new ObjectMapper().createObjectNode();
            response.put("code", 1);
            response.put("message", "plan sucessfully executed");
            return response;
        }
    } catch (IOException | TexeraException e) {
        throw new TexeraWebException(e.getMessage());
    }
}