1 files changed, 118 insertions, 0 deletions
diff --git a/qpid/java/broker/src/main/java/org/apache/qpid/server/model/adapter/GroupProviderFactory.java b/qpid/java/broker/src/main/java/org/apache/qpid/server/model/adapter/GroupProviderFactory.java
new file mode 100644
index 0000000000..1d3ccd81b3
--- /dev/null
+++ b/qpid/java/broker/src/main/java/org/apache/qpid/server/model/adapter/GroupProviderFactory.java
@@ -0,0 +1,118 @@
+/*
+ *
+ * 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.apache.qpid.server.model.adapter;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+import org.apache.qpid.server.configuration.IllegalConfigurationException;
+import org.apache.qpid.server.model.Broker;
+import org.apache.qpid.server.model.GroupProvider;
+import org.apache.qpid.server.plugin.GroupManagerFactory;
+import org.apache.qpid.server.plugin.QpidServiceLoader;
+import org.apache.qpid.server.security.group.GroupManager;
+
+public class GroupProviderFactory
+{
+    private final Map<String, GroupManagerFactory> _factories;
+    private Collection<String> _supportedGroupProviders;
+
+    public GroupProviderFactory(QpidServiceLoader<GroupManagerFactory> groupManagerFactoryServiceLoader)
+    {
+        Iterable<GroupManagerFactory> factories = groupManagerFactoryServiceLoader.instancesOf(GroupManagerFactory.class);
+
+        Map<String, GroupManagerFactory> registeredGroupProviderFactories = new HashMap<String, GroupManagerFactory>();
+        for (GroupManagerFactory factory : factories)
+        {
+            GroupManagerFactory existingFactory = registeredGroupProviderFactories.put(factory.getType(), factory);
+            if (existingFactory != null)
+            {
+                throw new IllegalConfigurationException("Group provider factory of the same type '" + factory.getType()
+                        + "' is already registered using class '" + existingFactory.getClass().getName()
+                        + "', can not register class '" + factory.getClass().getName() + "'");
+            }
+        }
+        _factories = registeredGroupProviderFactories;
+        _supportedGroupProviders = Collections.unmodifiableCollection(registeredGroupProviderFactories.keySet());
+    }
+
+    /**
+     * Creates {@link GroupProvider} for given ID, {@link Broker} and attributes.
+     * <p>
+     * The configured {@link GroupManagerFactory}'s are used to try to create the {@link GroupProvider}. The first non-null
+     * instance is returned. The factories are used in non-deterministic order.
+     */
+    public GroupProvider create(UUID id, Broker broker, Map<String, Object> attributes)
+    {
+        GroupProviderAdapter authenticationProvider = createGroupProvider(id, broker, attributes);
+        authenticationProvider.getGroupManager().onCreate();
+        return authenticationProvider;
+    }
+
+    /**
+     * Recovers {@link GroupProvider} with given ID, {@link Broker} and attributes.
+     * <p>
+     * The configured {@link GroupManagerFactory}'s are used to try to create the {@link GroupProvider}. The first non-null
+     * instance is returned. The factories are used in non-deterministic order.
+     */
+    public GroupProvider recover(UUID id, Broker broker, Map<String, Object> attributes)
+    {
+        return createGroupProvider(id, broker, attributes);
+    }
+
+    public Collection<String> getSupportedGroupProviders()
+    {
+        return _supportedGroupProviders;
+    }
+
+    private GroupProviderAdapter createGroupProvider(UUID id, Broker broker, Map<String, Object> attributes)
+    {
+        for (GroupManagerFactory factory : _factories.values())
+        {
+            GroupManager manager = factory.createInstance(attributes);
+            if (manager != null)
+            {
+                verifyGroupManager(manager, broker);
+                return new GroupProviderAdapter(id, broker, manager, attributes,factory.getAttributeNames());
+            }
+        }
+        throw new IllegalConfigurationException("No group provider factory found for configuration attributes " + attributes);
+    }
+
+    private void verifyGroupManager(GroupManager manager, Broker broker)
+    {
+        Collection<GroupProvider> groupProviders = broker.getGroupProviders();
+        for (GroupProvider groupProvider : groupProviders)
+        {
+            if (groupProvider instanceof GroupProviderAdapter)
+            {
+                GroupManager providerManager = ((GroupProviderAdapter) groupProvider).getGroupManager();
+                if (manager.equals(providerManager))
+                {
+                    throw new IllegalConfigurationException("A group provider with the same settings already exists");
+                }
+            }
+        }
+    }
+}