1 files changed, 102 insertions, 0 deletions
diff --git a/java/broker/src/main/java/org/apache/qpid/server/configuration/BrokerConfigurationStoreCreator.java b/java/broker/src/main/java/org/apache/qpid/server/configuration/BrokerConfigurationStoreCreator.java
new file mode 100644
index 0000000000..31e08ab88a
--- /dev/null
+++ b/java/broker/src/main/java/org/apache/qpid/server/configuration/BrokerConfigurationStoreCreator.java
@@ -0,0 +1,102 @@
+/*
+ *
+ * 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.configuration;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.qpid.server.configuration.store.JsonConfigurationEntryStore;
+import org.apache.qpid.server.plugin.QpidServiceLoader;
+
+/**
+ * A helper class responsible for creation and opening of broker store.
+ */
+public class BrokerConfigurationStoreCreator
+{
+    /**
+     * URL to resource containing broker default configuration
+     */
+    public static final String DEFAULT_INITIAL_STORE_LOCATION = BrokerConfigurationStoreCreator.class.getClassLoader()
+            .getResource("initial-store.json").toExternalForm();
+
+    private Map<String, ConfigurationStoreFactory> _factories = new HashMap<String, ConfigurationStoreFactory>();
+
+    public BrokerConfigurationStoreCreator()
+    {
+        QpidServiceLoader<ConfigurationStoreFactory> serviceLoader = new QpidServiceLoader<ConfigurationStoreFactory>();
+        Iterable<ConfigurationStoreFactory> configurationStoreFactories = serviceLoader
+                .instancesOf(ConfigurationStoreFactory.class);
+        for (ConfigurationStoreFactory storeFactory : configurationStoreFactories)
+        {
+            String type = storeFactory.getStoreType();
+            ConfigurationStoreFactory factory = _factories.put(type.toLowerCase(), storeFactory);
+            if (factory != null)
+            {
+                throw new IllegalStateException("ConfigurationStoreFactory with type name '" + type
+                        + "' is already registered using class '" + factory.getClass().getName() + "', can not register class '"
+                        + storeFactory.getClass().getName() + "'");
+            }
+        }
+    }
+
+    /**
+     * Create broker configuration store for a given store location, store type, initial store location and initial store type
+     *
+     * @param storeLocation store location
+     * @param storeType store type
+     * @param initialStoreLocation initial store location
+     * @param initialStoreType initial store type
+     * @return store instance opened at given store location
+     * @throws IllegalConfigurationException if store type is unknown
+     */
+    public ConfigurationEntryStore createStore(String storeLocation, String storeType, String initialStoreLocation,
+            String initialStoreType)
+    {
+        ConfigurationEntryStore store = createStore(storeType);
+        if (initialStoreLocation == null)
+        {
+            initialStoreLocation = DEFAULT_INITIAL_STORE_LOCATION;
+            initialStoreType = JsonConfigurationEntryStore.STORE_TYPE;
+        }
+        if (storeType.equals(initialStoreType))
+        {
+            store.open(storeLocation, initialStoreLocation);
+        }
+        else
+        {
+            ConfigurationEntryStore initialStore = createStore(initialStoreType);
+            initialStore.open(initialStoreLocation);
+            store.open(storeLocation, initialStore);
+        }
+        return store;
+    }
+
+    private ConfigurationEntryStore createStore(String storeType)
+    {
+        ConfigurationStoreFactory factory = _factories.get(storeType.toLowerCase());
+        if (factory == null)
+        {
+            throw new IllegalConfigurationException("Unknown store type: " + storeType);
+        }
+        return factory.createStore();
+    }
+
+}