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   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.dbquery.internal;
  14
  15 import org.eclipse.jdt.annotation.NonNullByDefault;
  16 import org.eclipse.jdt.annotation.Nullable;
  17 import org.openhab.binding.dbquery.internal.config.QueryConfiguration;
  18 import org.openhab.binding.dbquery.internal.domain.Database;
  19 import org.openhab.binding.dbquery.internal.domain.Query;
  20 import org.openhab.binding.dbquery.internal.domain.QueryParameters;
  21 import org.openhab.binding.dbquery.internal.domain.QueryResult;
  22 import org.slf4j.Logger;
  23 import org.slf4j.LoggerFactory;
  24
  25 /**
  26  * Mantains information of a query that is currently executing
  27  *
  28  * @author Joan Pujol - Initial contribution
  29  */
  30 @NonNullByDefault
  31 public class QueryExecution {
  32     private final Logger logger = LoggerFactory.getLogger(QueryExecution.class);
  33     private final Database database;
  34     private final String queryString;
  35     private final QueryConfiguration queryConfiguration;
  36
  37     private QueryParameters queryParameters;
  38     private @Nullable QueryResultListener queryResultListener;
  39
  40     public QueryExecution(Database database, QueryConfiguration queryConfiguration,
  41             QueryResultListener queryResultListener) {
  42         this.database = database;
  43         this.queryString = queryConfiguration.getQuery();
  44         this.queryConfiguration = queryConfiguration;
  45         this.queryResultListener = queryResultListener;
  46         this.queryParameters = QueryParameters.EMPTY;
  47     }
  48
  49     public void setQueryParameters(QueryParameters queryParameters) {
  50         this.queryParameters = queryParameters;
  51     }
  52
  53     public void execute() {
  54         Query query;
  55         if (queryConfiguration.isHasParameters()) {
  56             query = database.queryFactory().createQuery(queryString, queryParameters, queryConfiguration);
  57         } else {
  58             query = database.queryFactory().createQuery(queryString, queryConfiguration);
  59         }
  60
  61         logger.trace("Execute query {}", query);
  62         database.executeQuery(query).thenAccept(this::notifyQueryResult).exceptionally(error -> {
  63             logger.warn("Error executing query", error);
  64             notifyQueryResult(QueryResult.ofIncorrectResult("Error executing query"));
  65             return null;
  66         });
  67     }
  68
  69     private void notifyQueryResult(QueryResult queryResult) {
  70         var currentQueryResultListener = queryResultListener;
  71         if (currentQueryResultListener != null) {
  72             currentQueryResultListener.queryResultReceived(queryResult);
  73         }
  74     }
  75
  76     public void cancel() {
  77         queryResultListener = null;
  78     }
  79
  80     public QueryParameters getQueryParameters() {
  81         return queryParameters;
  82     }
  83
  84     public interface QueryResultListener {
  85         void queryResultReceived(QueryResult queryResult);
  86     }
  87
  88     @Override
  89     public String toString() {
  90         return "QueryExecution{" + "queryString='" + queryString + '\'' + ", queryParameters=" + queryParameters + '}';
  91     }
  92 }