Add ManagedProviders to UIRegistry (#2617)

* UIRegistry now extensible, like other Registries

Signed-off-by: Jonathan Gilbert <jpg@trillica.com>

* Fix comments and more

Signed-off-by: Wouter Born <github@maindrain.net>

Co-authored-by: Wouter Born <github@maindrain.net>

bundles/org.openhab.core.ui/src/main/java/org/openhab/core/ui/internal/components/ManagedPageProvider.java

@@ -0,0 +1,35 @@
+/**
+ * Copyright (c) 2010-2022 Contributors to the openHAB project
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package org.openhab.core.ui.internal.components;
+
+import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.openhab.core.common.registry.ManagedProvider;
+import org.openhab.core.common.registry.Provider;
+import org.openhab.core.storage.StorageService;
+import org.osgi.service.component.annotations.Activate;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Reference;
+
+/**
+ * A managed page provider which uses storage layer to keep defined pages.
+ *
+ * @author Łukasz Dywicki - Initial contribution
+ */
+@NonNullByDefault
+@Component(service = { Provider.class, ManagedProvider.class, UIProvider.class })
+public class ManagedPageProvider extends UIComponentProvider {
+    @Activate
+    public ManagedPageProvider(@Reference StorageService storageService) {
+        super("ui:page", storageService);
+    }
+}

bundles/org.openhab.core.ui/src/main/java/org/openhab/core/ui/internal/components/ManagedWidgetProvider.java

@@ -0,0 +1,35 @@
+/**
+ * Copyright (c) 2010-2022 Contributors to the openHAB project
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package org.openhab.core.ui.internal.components;
+
+import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.openhab.core.common.registry.ManagedProvider;
+import org.openhab.core.common.registry.Provider;
+import org.openhab.core.storage.StorageService;
+import org.osgi.service.component.annotations.Activate;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Reference;
+
+/**
+ * A managed widget provider which stores their definition in storage layer.
+ *
+ * @author Łukasz Dywicki - Initial contribution
+ */
+@NonNullByDefault
+@Component(service = { Provider.class, ManagedProvider.class, UIProvider.class })
+public class ManagedWidgetProvider extends UIComponentProvider {
+    @Activate
+    public ManagedWidgetProvider(@Reference StorageService storageService) {
+        super("ui:widget", storageService);
+    }
+}

bundles/org.openhab.core.ui/src/main/java/org/openhab/core/ui/internal/components/UIComponentProvider.java

@@ -31,7 +31,7 @@ import org.openhab.core.ui.components.RootUIComponent;
  */
 @NonNullByDefault
 public class UIComponentProvider extends AbstractProvider<RootUIComponent>
-        implements ManagedProvider<RootUIComponent, String> {
+        implements ManagedProvider<RootUIComponent, String>, UIProvider {
 
     private String namespace;
     private volatile Storage<RootUIComponent> storage;
@@ -107,4 +107,9 @@ public class UIComponentProvider extends AbstractProvider<RootUIComponent>
         }
         return storage.get(key);
     }
+
+    @Override
+    public String getNamespace() {
+        return namespace;
+    }
 }

bundles/org.openhab.core.ui/src/main/java/org/openhab/core/ui/internal/components/UIComponentRegistryFactoryImpl.java

@@ -12,34 +12,90 @@
  */
 package org.openhab.core.ui.internal.components;
 
-import java.util.HashMap;
+import java.util.Collections;
+import java.util.HashSet;
 import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 
-import org.openhab.core.storage.StorageService;
+import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.openhab.core.common.registry.ManagedProvider;
+import org.openhab.core.ui.components.RootUIComponent;
 import org.openhab.core.ui.components.UIComponentRegistryFactory;
 import org.osgi.service.component.annotations.Component;
 import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.component.annotations.ReferenceCardinality;
+import org.osgi.service.component.annotations.ReferencePolicy;
 
 /**
- * Implementation for a {@link UIComponentRegistryFactory} using a {@link StorageService} and a
- * {@link UIComponentProvider}.
+ * Implementation for a {@link UIComponentRegistryFactory} using a set of {@link UIComponentProvider}.
  *
  * @author Yannick Schaus - Initial contribution
+ * @author Łukasz Dywicki - Removed explicit dependency on storage providers.
+ * @author Jonathan Gilbert - Made providers' collections immutable.
  */
+@NonNullByDefault
 @Component(service = UIComponentRegistryFactory.class, immediate = true)
 public class UIComponentRegistryFactoryImpl implements UIComponentRegistryFactory {
-    Map<String, UIComponentRegistryImpl> registries = new HashMap<>();
-
-    @Reference
-    StorageService storageService;
+    Map<String, UIComponentRegistryImpl> registries = new ConcurrentHashMap<>();
+    Map<String, Set<UIProvider>> providers = new ConcurrentHashMap<>();
 
     @Override
     public UIComponentRegistryImpl getRegistry(String namespace) {
         UIComponentRegistryImpl registry = registries.get(namespace);
         if (registry == null) {
-            registry = new UIComponentRegistryImpl(namespace, storageService);
+            Set<UIProvider> namespaceProviders = this.providers.get(namespace);
+            ManagedProvider<RootUIComponent, String> managedProvider = null;
+            if (namespaceProviders != null) {
+                for (UIProvider provider : namespaceProviders) {
+                    if (provider instanceof ManagedProvider) {
+                        managedProvider = (ManagedProvider<RootUIComponent, String>) provider;
+                        break;
+                    }
+                }
+            }
+            registry = new UIComponentRegistryImpl(namespace, managedProvider, namespaceProviders);
             registries.put(namespace, registry);
         }
         return registry;
     }
+
+    @Reference(cardinality = ReferenceCardinality.MULTIPLE, policy = ReferencePolicy.DYNAMIC)
+    void addProvider(UIProvider provider) {
+        UIComponentRegistryImpl registry = registries.get(provider.getNamespace());
+        if (registry != null) {
+            registry.addProvider(provider);
+        }
+        registerProvider(provider);
+    }
+
+    void removeProvider(UIProvider provider) {
+        UIComponentRegistryImpl registry = registries.get(provider.getNamespace());
+        if (registry != null) {
+            registry.removeProvider(provider);
+        }
+        deregisterProvider(provider);
+    }
+
+    private void registerProvider(UIProvider provider) {
+        Set<UIProvider> existing = providers.get(provider.getNamespace());
+
+        if (existing == null) {
+            existing = Collections.emptySet();
+        }
+
+        Set<UIProvider> updated = new HashSet<>(existing);
+        updated.add(provider);
+        providers.put(provider.getNamespace(), Set.copyOf(updated));
+    }
+
+    private void deregisterProvider(UIProvider provider) {
+        Set<UIProvider> existing = providers.get(provider.getNamespace());
+
+        if (existing != null && !existing.isEmpty()) {
+            Set<UIProvider> updated = new HashSet<>(existing);
+            updated.remove(provider);
+            providers.put(provider.getNamespace(), Set.copyOf(updated));
+        }
+    }
 }

bundles/org.openhab.core.ui/src/main/java/org/openhab/core/ui/internal/components/UIComponentRegistryImpl.java

@@ -12,9 +12,13 @@
  */
 package org.openhab.core.ui.internal.components;
 
+import java.util.Set;
+
 import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.eclipse.jdt.annotation.Nullable;
 import org.openhab.core.common.registry.AbstractRegistry;
-import org.openhab.core.storage.StorageService;
+import org.openhab.core.common.registry.ManagedProvider;
+import org.openhab.core.common.registry.Provider;
 import org.openhab.core.ui.components.RootUIComponent;
 import org.openhab.core.ui.components.UIComponentRegistry;
 
@@ -23,26 +27,37 @@ import org.openhab.core.ui.components.UIComponentRegistry;
  * It is instantiated by the {@link UIComponentRegistryFactoryImpl}.
  *
  * @author Yannick Schaus - Initial contribution
+ * @author Łukasz Dywicki - Support for dynamic registration of providers
  */
 @NonNullByDefault
 public class UIComponentRegistryImpl extends AbstractRegistry<RootUIComponent, String, UIComponentProvider>
         implements UIComponentRegistry {
 
-    String namespace;
-    StorageService storageService;
-
     /**
      * Constructs a UI component registry for the specified namespace.
      *
      * @param namespace UI components namespace of this registry
-     * @param storageService supporting storage service
      */
-    public UIComponentRegistryImpl(String namespace, StorageService storageService) {
+    public UIComponentRegistryImpl(String namespace, @Nullable ManagedProvider<RootUIComponent, String> managedProvider,
+            @Nullable Set<UIProvider> providers) {
         super(null);
-        this.namespace = namespace;
-        this.storageService = storageService;
-        UIComponentProvider provider = new UIComponentProvider(namespace, storageService);
-        addProvider(provider);
-        setManagedProvider(provider);
+        if (managedProvider != null) {
+            setManagedProvider(managedProvider);
+        }
+        if (providers != null && !providers.isEmpty()) {
+            for (Provider<RootUIComponent> provider : providers) {
+                addProvider(provider);
+            }
+        }
+    }
+
+    @Override
+    public void addProvider(Provider<RootUIComponent> provider) {
+        super.addProvider(provider);
+    }
+
+    @Override
+    public void removeProvider(Provider<RootUIComponent> provider) {
+        super.removeProvider(provider);
     }
 }

bundles/org.openhab.core.ui/src/main/java/org/openhab/core/ui/internal/components/UIProvider.java

@@ -0,0 +1,27 @@
+/**
+ * Copyright (c) 2010-2022 Contributors to the openHAB project
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package org.openhab.core.ui.internal.components;
+
+import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.openhab.core.common.registry.Provider;
+import org.openhab.core.ui.components.RootUIComponent;
+
+/**
+ * Provides components (pages, widgets, etc.) at runtime.
+ *
+ * @author Łukasz Dywicki - Initial contribution
+ */
+@NonNullByDefault
+public interface UIProvider extends Provider<RootUIComponent> {
+    String getNamespace();
+}