First stubs to register PreferenceConverters on the UserStore

java/com.sap.sailing.server/src/com/sap/sailing/server/impl/Activator.java

@@ -34,7 +34,9 @@ import com.sap.sse.common.TypeBasedServiceFinder;
 import com.sap.sse.common.Util;
 import com.sap.sse.osgi.CachedOsgiTypeBasedServiceFinderFactory;
 import com.sap.sse.replication.Replicable;
+import com.sap.sse.security.UserStore;
 import com.sap.sse.util.ClearStateTestSupport;
+import com.sap.sse.util.ServiceTrackerFactory;
 
 public class Activator implements BundleActivator {
 
@@ -108,6 +110,9 @@ public class Activator implements BundleActivator {
         // legacy type name; some DBs may still contain fixes marked with this old package name:
         properties.put(TypeBasedServiceFinder.TYPE, "com.sap.sailing.domain.tracking.impl.GPSFixMovingImpl");
         registrations.add(context.registerService(GPSFixMongoHandler.class, gpsFixMovingMongoHandler, properties));
+        
+        registerPreferenceConvertersWhenUserStoreIsAvailable(context);
+        
         // Add an MBean for the service to the JMX bean server:
         RacingEventServiceMXBean mbean = new RacingEventServiceMXBeanImpl(racingEventService);
         MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
@@ -117,6 +122,29 @@ public class Activator implements BundleActivator {
                 Charset.defaultCharset());
     }
 
+    private void registerPreferenceConvertersWhenUserStoreIsAvailable(BundleContext bundleContext) {
+        ServiceTracker<UserStore, UserStore> userStoreTracker = ServiceTrackerFactory.createAndOpen(bundleContext,
+                UserStore.class);
+        new Thread("ServiceTracker waiting for UserStore service") {
+            @Override
+            public void run() {
+                try {
+                    logger.info("Waiting for UserStore service...");
+                    UserStore userStore = userStoreTracker.waitForService(0);
+                    logger.info("Obtained UserStore service " + userStore);
+                    registerPreferenceConvertersForUserStore(userStore);
+                } catch (InterruptedException e) {
+                    logger.log(Level.SEVERE, "Interrupted while waiting for UserStore service", e);
+                }
+            }
+        }.start();
+    }
+
+    protected void registerPreferenceConvertersForUserStore(UserStore userStore) {
+        // TODO implement for favorite settings
+        // userStore.registerPreferenceConverter("TODO", new GenericJSONPreferenceConverter(null));
+    }
+
     public void stop(BundleContext context) throws Exception {
         masterDataImportClassLoaderServiceTracker.close();
         if (extenderBundleTracker != null) {

java/com.sap.sailing.server/src/com/sap/sailing/server/impl/GenericJSONPreferenceConverter.java

@@ -0,0 +1,28 @@
+package com.sap.sailing.server.impl;
+
+import java.util.function.Supplier;
+
+import com.sap.sse.common.settings.generic.GenericSerializableSettings;
+import com.sap.sse.security.PreferenceConverter;
+import com.sap.sse.shared.settings.SettingsToJsonSerializer;
+
+public class GenericJSONPreferenceConverter<PREF extends GenericSerializableSettings> implements PreferenceConverter<PREF> {
+    
+    private final SettingsToJsonSerializer serializer = new SettingsToJsonSerializer();
+    private final Supplier<PREF> emptyInstanceFactory;
+    
+    public GenericJSONPreferenceConverter(Supplier<PREF> emptyInstanceFactory) {
+        this.emptyInstanceFactory = emptyInstanceFactory;
+    }
+
+    @Override
+    public String toString(PREF preference) {
+        return serializer.serializeToString(preference);
+    }
+
+    @Override
+    public PREF toPreference(String stringPreference) {
+        return serializer.deserialize(emptyInstanceFactory.get(), stringPreference);
+    }
+
+}

java/com.sap.sse.security/src/com/sap/sse/security/PreferenceConverter.java

@@ -0,0 +1,7 @@
+package com.sap.sse.security;
+
+public interface PreferenceConverter<PREF> {
+    String toString(PREF preference);
+
+    PREF toPreference(String stringPreference);
+}

java/com.sap.sse.security/src/com/sap/sse/security/UserStore.java

@@ -106,4 +106,6 @@ public interface UserStore extends Named {
      * {@code username} no access token has previously been {@link #setAccessToken(String, String) set}.
      */
     String getAccessToken(String username);
+    
+//    void registerPreferenceConverter(String preferenceKey, PreferenceConverter<?> converter);
 }