add static capabilites provider for creating and providing static cap…

…abilities (generated by the service) instead of dynamic

iceland/core/src/main/java/org/n52/iceland/cache/ctrl/AbstractSchedulingContentCacheController.java

@@ -17,9 +17,12 @@
 
 import java.text.ParseException;
 import java.util.Date;
+import java.util.Optional;
 import java.util.Timer;
 import java.util.TimerTask;
 
+import javax.inject.Inject;
+
 import org.joda.time.DateTime;
 import org.n52.faroe.ConfigurationError;
 import org.n52.faroe.Validation;
@@ -44,9 +47,11 @@ public abstract class AbstractSchedulingContentCacheController implements Conten
     private static final Logger LOGGER = LoggerFactory.getLogger(AbstractSchedulingContentCacheController.class);
 
     private boolean initialized;
-    private long updateInterval;
+    private long updateInterval = 120;
     private final Timer timer = new Timer("52n-iceland-capabilities-cache-controller", true);
     private TimerTask current;
+    private Optional<StaticCapabilitiesProvider> staticCapabilitiesProvider;
+
 
     /**
      * Starts a new timer task
@@ -74,20 +79,20 @@ public void setCronExpression(String cronExpression) {
         Validation.notNullOrEmpty("Cron expression for cache update", cronExpression);
         try {
             DateTime now = DateTime.now();
-            Date next = new CronExpression(cronExpression).getNextInvalidTimeAfter(DateTime.now().toDate());
-            setUpdateInterval(DateTimeHelper.getMinutesSince(now, new DateTime(next)));
+            CronExpression cronExp = new CronExpression(cronExpression);
+            Date first = cronExp.getNextValidTimeAfter(now.toDate());
+            Date next = cronExp.getNextValidTimeAfter(first);
+            setUpdateInterval(DateTimeHelper.getMinutesSince(new DateTime(first), new DateTime(next)));
         } catch (ParseException e) {
+
             throw new ConfigurationError(String.format("The defined cron expression '%s' is invalid!", cronExpression),
                     e);
         }
-        // for later usage!
-//        if (this.cronExpression == null) {
-//            this.cronExpression = cronExpression;
-//            reschedule();
-//        } else if (!this.cronExpression.equalsIgnoreCase(cronExpression)) {
-//            this.cronExpression = cronExpression;
-//            reschedule();
-//        }
+    }
+
+    @Inject
+    public void setStaticCapabilitiesProvider(Optional<StaticCapabilitiesProvider> staticCapabilitiesProvider) {
+        this.staticCapabilitiesProvider = staticCapabilitiesProvider;
     }
 
     public void setUpdateInterval(int interval) throws ConfigurationError {
@@ -151,6 +156,9 @@ public void run() {
                 update();
                 LOGGER.info("Timertask: capabilities cache update successful!");
                 schedule();
+                if (staticCapabilitiesProvider.isPresent()) {
+                    staticCapabilitiesProvider.get().create();
+                }
             } catch (OwsExceptionReport e) {
                 LOGGER.error("Fatal error: Timertask couldn't update capabilities cache! " +
                              "Switch log level to DEBUG to get more details.");

iceland/core/src/main/java/org/n52/iceland/cache/ctrl/StaticCapabilitiesProvider.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2015-2022 52°North Spatial Information Research GmbH
+ *
+ * Licensed 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.n52.iceland.cache.ctrl;
+
+import org.n52.shetland.ogc.ows.service.GetCapabilitiesResponse;
+
+public interface StaticCapabilitiesProvider {
+
+    String PROVIDE_STATIC_CAPABILITIES = "service.capabilities.provide.static";
+
+    default boolean isProvideStaticCapabilities() {
+        return false;
+    }
+
+    void create();
+
+    String get(GetCapabilitiesResponse response);
+
+    String get(String identifier);
+
+}