@@ -0,0 +1,1670 @@
+/*%0A * Licensed to the Apache Software Foundation (ASF) under one%0A * or more contributor license agreements.  See the NOTICE file%0A * distributed with this work for additional information%0A * regarding copyright ownership.  The ASF licenses this file%0A * to you under the Apache License, Version 2.0 (the%0A * %22License%22); you may not use this file except in compliance%0A * with the License.  You may obtain a copy of the License at%0A *%0A *   http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing,%0A * software distributed under the License is distributed on an%0A * %22AS IS%22 BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY%0A * KIND, either express or implied.  See the License for the%0A * specific language governing permissions and limitations%0A * under the License.%0A */%0Apackage com.cloud.utils.component;%0A%0Aimport java.util.List;%0A%0A/**%0A * Simple interface to represents a registry of items%0A *%0A * @param %3CT%3E%0A */%0Apublic interface Registry%3CT%3E extends Named %7B%0A%0A    /**%0A     * Registers an item.  If the item has already been registered the implementation%0A     * should detect that it is registered and not re-register it.%0A     *%0A     * @param type%0A     * @return true if register, false if not registered or already exists%0A     */%0A    boolean register(T type);%0A%0A    void unregister(T type);%0A%0A    /**%0A     * Returns a list that will dynamically change as items are registered/unregister.%0A     * The list is thread safe to iterate upon.  Traversing the list using an index%0A     * would not be safe as the size may changed during traversal.%0A     *%0A     * @return Unmodifiable list of registered items%0A     */%0A    List%3CT%3E getRegistered();%0A%0A%7D%0A

Add registry interface