Create 2.0-M4 release branch

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@831226 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 73 insertions, 0 deletions

diff --git a/branches/sca-java-2.0-M4/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/UtilityExtensionPoint.java b/branches/sca-java-2.0-M4/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/UtilityExtensionPoint.java
new file mode 100644
index 0000000000..bfeeac5696
--- /dev/null
+++ b/branches/sca-java-2.0-M4/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/UtilityExtensionPoint.java
@@ -0,0 +1,73 @@
+/*
+ * 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.tuscany.sca.core;
+
+
+/**
+ * The extension point for the Tuscany core utility extensions.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface UtilityExtensionPoint extends LifeCycleListener {
+
+    /**
+     * Add a utility to the extension point
+     * @param utility The instance of the utility
+     *
+     * @throws IllegalArgumentException if utility is null
+     */
+    void addUtility(Object utility);
+    
+    /**
+     * Add a utility to the extension point for a given key
+     * @param utility The instance of the utility
+     *
+     * @throws IllegalArgumentException if utility is null
+     */
+    void addUtility(Object key, Object utility);
+
+    /**
+     * Get the utility by the interface
+     * @param utilityType The lookup key (utility interface)
+     * @return The instance of the utility
+     *
+     * @throws IllegalArgumentException if utilityType is null
+     */
+    <T> T getUtility(Class<T> utilityType);
+
+    /**
+     * Get an instance of the utility by the interface and key
+     * @param utilityType The lookup key (utility interface)
+     * @param key A key associated with the utility, if it is null,
+     * then the utilityType is used as the key
+     * @return The instance of the utility
+     *
+     * @throws IllegalArgumentException if utilityType is null
+     */
+    <T> T getUtility(Class<T> utilityType, Object key);
+
+    /**
+     * Remove a utility
+     * @param utility The utility to remove
+     *
+     * @throws IllegalArgumentException if utility is null
+     */
+    void removeUtility(Object utility);
+}