Add support for Coordinator to Equinox Configuration Admin

Chapter 11 of the Configuration Admin Service Specification mandates the
support of the Coordinator service but currently Equinox fails the TCK
tests in that area.

This adds support for participation in the coordinator for the Equinox
Configuration Admin.

bundles/org.eclipse.equinox.cm/META-INF/MANIFEST.MF

@@ -8,8 +8,9 @@ Bundle-Version: 1.6.0.qualifier
 Bundle-Activator: org.eclipse.equinox.internal.cm.Activator
 Import-Package: org.osgi.framework;version="1.7.0",
  org.osgi.service.cm;version="[1.6,1.7)",
+ org.osgi.service.coordinator;version="[1.0.0,2.0.0]",
+ org.osgi.service.event;version="1.0";resolution:=optional,
  org.osgi.service.log;version="1.3.0",
- org.osgi.service.event;version="1.0"; resolution:=optional,
  org.osgi.util.tracker;version="1.3.1"
 Bundle-RequiredExecutionEnvironment: JavaSE-17
 Provide-Capability: 

bundles/org.eclipse.equinox.cm/src/org/eclipse/equinox/internal/cm/ConfigurationAdminFactory.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2005, 2019 Cognos Incorporated, IBM Corporation and others.
+ * Copyright (c) 2005, 2024 Cognos Incorporated, IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -11,14 +11,19 @@
  * Contributors:
  *     Cognos Incorporated - initial API and implementation
  *     IBM Corporation - bug fixes and enhancements
+ *     Christoph Läubrich - add support for Coordinator
  *******************************************************************************/
 package org.eclipse.equinox.internal.cm;
 
 import java.security.Permission;
-import java.util.Dictionary;
+import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Predicate;
 import org.osgi.framework.*;
 import org.osgi.service.cm.ConfigurationAdmin;
 import org.osgi.service.cm.ConfigurationPermission;
+import org.osgi.service.coordinator.*;
+import org.osgi.util.tracker.ServiceTracker;
 
 /**
  * ConfigurationAdminFactory provides a Configuration Admin ServiceFactory but
@@ -37,6 +42,9 @@ public class ConfigurationAdminFactory implements ServiceFactory<ConfigurationAd
 	private final ManagedServiceTracker managedServiceTracker;
 	private final ManagedServiceFactoryTracker managedServiceFactoryTracker;
 	private final ConfigurationStore configurationStore;
+	private final ServiceTracker<Coordinator, Coordinator> coordinationServiceTracker;
+
+	private final Map<Long, ConfigurationAdminParticipant> coordinationParticipants = new ConcurrentHashMap<>();
 
 	public ConfigurationAdminFactory(BundleContext context, LogTracker log) {
 		this.log = log;
@@ -45,9 +53,11 @@ public ConfigurationAdminFactory(BundleContext context, LogTracker log) {
 		pluginManager = new PluginManager(context);
 		managedServiceTracker = new ManagedServiceTracker(this, configurationStore, context);
 		managedServiceFactoryTracker = new ManagedServiceFactoryTracker(this, configurationStore, context);
+		coordinationServiceTracker = new ServiceTracker<>(context, Coordinator.class, null);
 	}
 
 	void start() {
+		coordinationServiceTracker.open();
 		eventDispatcher.start();
 		pluginManager.start();
 		managedServiceTracker.open();
@@ -59,6 +69,7 @@ void stop() {
 		managedServiceFactoryTracker.close();
 		eventDispatcher.stop();
 		pluginManager.stop();
+		coordinationServiceTracker.close();
 	}
 
 	@Override
@@ -137,17 +148,24 @@ void dispatchEvent(int type, String factoryPid, String pid) {
 	}
 
 	void notifyConfigurationUpdated(ConfigurationImpl config, boolean isFactory) {
-		if (isFactory)
+		if (isFactory) {
 			managedServiceFactoryTracker.notifyUpdated(config);
-		else
+		} else {
 			managedServiceTracker.notifyUpdated(config);
+		}
+	}
+
+	ConfigurationAdminParticipant coordinationParticipant(Coordination coordination) {
+		return coordinationParticipants.computeIfAbsent(coordination.getId(),
+				c -> new ConfigurationAdminParticipant(coordination));
 	}
 
 	void notifyConfigurationDeleted(ConfigurationImpl config, boolean isFactory) {
-		if (isFactory)
+		if (isFactory) {
 			managedServiceFactoryTracker.notifyDeleted(config);
-		else
+		} else {
 			managedServiceTracker.notifyDeleted(config);
+		}
 	}
 
 	void notifyLocationChanged(ConfigurationImpl config, String oldLocation, boolean isFactory) {
@@ -161,4 +179,50 @@ void notifyLocationChanged(ConfigurationImpl config, String oldLocation, boolean
 	Dictionary<String, Object> modifyConfiguration(ServiceReference<?> reference, ConfigurationImpl config) {
 		return pluginManager.modifyConfiguration(reference, config);
 	}
+
+	Optional<Coordination> coordinate() {
+		return Optional.ofNullable(coordinationServiceTracker.getService()).map(Coordinator::peek)
+				.filter(Predicate.not(Coordination::isTerminated));
+	}
+
+	private final class ConfigurationAdminParticipant implements Participant {
+
+		private Map<Object, Runnable> tasks = new HashMap<>();
+
+		public ConfigurationAdminParticipant(Coordination coordination) {
+			coordination.addParticipant(this);
+		}
+
+		@Override
+		public void ended(Coordination coordination) throws Exception {
+			finish(coordination);
+		}
+
+		@Override
+		public void failed(Coordination coordination) throws Exception {
+			finish(coordination);
+		}
+
+		private void finish(Coordination coordination) {
+			tasks.values().forEach(Runnable::run);
+			tasks.clear();
+		}
+
+		public void cancelTask(Object key) {
+			tasks.remove(key);
+		}
+
+		public void addTask(Object key, Runnable runnable) {
+			tasks.put(key, runnable);
+		}
+	}
+
+	void executeCoordinated(Object key, Runnable runnable) {
+		coordinate().ifPresentOrElse(coordination -> coordinationParticipant(coordination).addTask(key, runnable),
+				() -> runnable.run());
+	}
+
+	void cancelExecuteCoordinated(Object key) {
+		coordinate().ifPresent(coordination -> coordinationParticipant(coordination).cancelTask(key));
+	}
 }

bundles/org.eclipse.equinox.cm/src/org/eclipse/equinox/internal/cm/ManagedServiceFactoryTracker.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2005, 2018 Cognos Incorporated, IBM Corporation and others.
+ * Copyright (c) 2005, 2024 Cognos Incorporated, IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -11,6 +11,7 @@
  * Contributors:
  *     Cognos Incorporated - initial API and implementation
  *     IBM Corporation - bug fixes and enhancements
+ *     Christoph Läubrich - add support for Coordinator
  *******************************************************************************/
 package org.eclipse.equinox.internal.cm;
 
@@ -289,9 +290,9 @@ private void asynchUpdated(final ManagedServiceFactory service, final String pid
 		if (properties == null) {
 			return;
 		}
-		queue.put(new Runnable() {
-			@Override
-			public void run() {
+		configurationAdminFactory.cancelExecuteCoordinated(service);
+		configurationAdminFactory.executeCoordinated(service, () -> {
+			queue.put(() -> {
 				try {
 					service.updated(pid, properties);
 				} catch (ConfigurationException e) {
@@ -301,7 +302,7 @@ public void run() {
 				} catch (Throwable t) {
 					configurationAdminFactory.error(t.getMessage(), t);
 				}
-			}
+			});
 		});
 	}
 }

bundles/org.eclipse.equinox.cm/src/org/eclipse/equinox/internal/cm/ManagedServiceTracker.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2005, 2018 Cognos Incorporated, IBM Corporation and others.
+ * Copyright (c) 2005, 2024 Cognos Incorporated, IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -11,6 +11,7 @@
  * Contributors:
  *     Cognos Incorporated - initial API and implementation
  *     IBM Corporation - bug fixes and enhancements
+ *     Christoph Läubrich - add support for Coordinator
  *******************************************************************************/
 package org.eclipse.equinox.internal.cm;
 
@@ -283,19 +284,17 @@ private List<ServiceReference<ManagedService>> getManagedServiceReferences(Strin
 	}
 
 	private void asynchUpdated(final ManagedService service, final Dictionary<String, ?> properties) {
-		queue.put(new Runnable() {
-			@Override
-			public void run() {
-				try {
-					service.updated(properties);
-				} catch (ConfigurationException e) {
-					// we might consider doing more for ConfigurationExceptions
-					Throwable cause = e.getCause();
-					configurationAdminFactory.error(e.getMessage(), cause != null ? cause : e);
-				} catch (Throwable t) {
-					configurationAdminFactory.error(t.getMessage(), t);
-				}
+		configurationAdminFactory.cancelExecuteCoordinated(service);
+		configurationAdminFactory.executeCoordinated(service, () -> queue.put(() -> {
+			try {
+				service.updated(properties);
+			} catch (ConfigurationException e) {
+				// we might consider doing more for ConfigurationExceptions
+				Throwable cause = e.getCause();
+				configurationAdminFactory.error(e.getMessage(), cause != null ? cause : e);
+			} catch (Throwable t) {
+				configurationAdminFactory.error(t.getMessage(), t);
 			}
-		});
+		}));
 	}
 }