[incubator-kie-issues#1612] Fix BusinessCalendar behavior with inconsistent (full/partial) set of properties on calendar.properties

api/kogito-api/src/main/java/org/kie/kogito/calendar/BusinessCalendar.java

@@ -27,18 +27,21 @@
 public interface BusinessCalendar {
 
     /**
-     * Calculates given time expression into duration in milliseconds based on calendar configuration.
-     * 
+     * Returns the difference, in milliseconds, between the <b>business date</b> that matches the given
+     * <code>timeExpression</code>, and the current time.
+     * See {@link #calculateBusinessTimeAsDate} for <b>business date</b> calculation
+     *
      * @param timeExpression time expression that is supported by business calendar implementation.
      * @return duration expressed in milliseconds
      */
-    public long calculateBusinessTimeAsDuration(String timeExpression);
+    long calculateBusinessTimeAsDuration(String timeExpression);
 
     /**
-     * Calculates given time expression into target date based on calendar configuration.
+     * Returns the first <code>Date</code> that matches the given <code>timeExpression</code> and falls
+     * into the business calendar working hours.
      * 
      * @param timeExpression time expression that is supported by business calendar implementation.
      * @return date when given time expression will match in the future
      */
-    public Date calculateBusinessTimeAsDate(String timeExpression);
+    Date calculateBusinessTimeAsDate(String timeExpression);
 }

jbpm/jbpm-flow/src/main/java/org/jbpm/process/core/timer/CalendarBeanFactory.java

@@ -0,0 +1,61 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.jbpm.process.core.timer;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.Objects;
+import java.util.Properties;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.jbpm.process.core.constants.CalendarConstants.BUSINESS_CALENDAR_PATH;
+
+public class CalendarBeanFactory {
+
+    private static final Logger logger = LoggerFactory.getLogger(CalendarBeanFactory.class);
+
+    public static CalendarBean createCalendarBean() {
+        logger.debug("createCalendarBean");
+        URL resource = Thread.currentThread().getContextClassLoader().getResource(BUSINESS_CALENDAR_PATH);
+        if (Objects.nonNull(resource)) {
+            logger.debug("URL resource: {}", resource);
+            Properties calendarConfiguration = new Properties();
+            try (InputStream is = resource.openStream()) {
+                calendarConfiguration.load(is);
+                return new CalendarBean(calendarConfiguration);
+            } catch (IOException e) {
+                String errorMessage = "Error while loading properties for business calendar";
+                logger.error(errorMessage, e);
+                throw new RuntimeException(errorMessage, e);
+            } catch (IllegalArgumentException e) {
+                String errorMessage = "Error while populating properties for business calendar";
+                logger.error(errorMessage, e);
+                throw e;
+            }
+        } else {
+            String errorMessage = String.format("Missing %s", BUSINESS_CALENDAR_PATH);
+            logger.error(errorMessage);
+            throw new RuntimeException(errorMessage);
+        }
+    }
+}