1 files changed, 249 insertions, 0 deletions
diff --git a/sandbox/rfeng/runtime/embedded/src/main/java/org/apache/tuscany/api/SCARuntime.java b/sandbox/rfeng/runtime/embedded/src/main/java/org/apache/tuscany/api/SCARuntime.java
new file mode 100644
index 0000000000..8fb945a28a
--- /dev/null
+++ b/sandbox/rfeng/runtime/embedded/src/main/java/org/apache/tuscany/api/SCARuntime.java
@@ -0,0 +1,249 @@
+/*
+ * 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.api;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.URL;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+
+import org.osoa.sca.ComponentContext;
+
+/**
+ * SCARuntime is used to start a Tuscany SCA runtime.
+ */
+public abstract class SCARuntime {
+
+    private static SCARuntime instance;
+
+    /**
+     * Read the service name from a configuration file
+     * 
+     * @param classLoader
+     * @param name The name of the service class
+     * @return A class name which extends/implements the service class
+     * @throws IOException
+     */
+    private static String getServiceName(ClassLoader classLoader, String name) throws IOException {
+        InputStream is = classLoader.getResourceAsStream("META-INF/services/" + name);
+        if (is == null) {
+            return null;
+        }
+        BufferedReader reader = null;
+        try {
+            reader = new BufferedReader(new InputStreamReader(is));
+            while (true) {
+                String line = reader.readLine();
+                if (line == null) {
+                    break;
+                } else if (!line.startsWith("#")) {
+                    return line.trim();
+                }
+            }
+        } finally {
+            if (reader != null) {
+                reader.close();
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Returns a SCARuntime instance. If the system property
+     * "org.apache.tuscany.api.SCARuntime" is set, its value is used as the name
+     * of the implementation class. Otherwise, if the resource
+     * "META-INF/services/org.apache.tuscany.api.SCARuntime" can be loaded from
+     * the supplied classloader. Otherwise, it will use
+     * "org.apache.tuscany.runtime.embedded.DefaultSCARuntime" as the default.
+     * The named class is loaded from the supplied classloader and instantiated
+     * using its default (no-arg) constructor.
+     * 
+     * @return
+     */
+    private static SCARuntime newInstance(final ClassLoader classLoader) {
+
+        try {
+            final String name = SCARuntime.class.getName();
+            String className = AccessController.doPrivileged(new PrivilegedAction<String>() {
+                public String run() {
+                    return System.getProperty(name);
+                }
+            });
+
+            if (className == null) {
+                className = getServiceName(classLoader, name);
+            }
+            if (className == null) {
+                className = "org.apache.tuscany.runtime.embedded.DefaultSCARuntime";
+            }
+            Class cls = Class.forName(className, true, classLoader);
+            return (SCARuntime)cls.newInstance(); // NOPMD lresende
+        } catch (Exception e) {
+            throw new IllegalStateException(e);
+        }
+    }
+
+    /**
+     * Get an instance of SCA Runtime
+     * 
+     * @return The instance
+     */
+    public static synchronized SCARuntime getInstance() { // NOPMD
+        if (instance != null) {
+            return instance;
+        }
+        ClassLoader classLoader = SCARuntime.class.getClassLoader();
+        instance = newInstance(classLoader);
+        return instance;
+    }
+
+    /**
+     * Start the Tuscany runtime using default SCDLs
+     */
+    public static void start() {
+        try {
+            getInstance().startup(null, null, null, null);
+        } catch (Exception e) {
+            throw new IllegalStateException(e);
+        }
+    }
+
+    /**
+     * Start the SCA Runtime with the given SCDLs
+     * 
+     * @param system The URL for the system SCDL
+     * @param extensions An array of URLs for extensions
+     * @param application The URL for the application SCDL
+     */
+    public static void start(URL system, URL[] extensions, URL application, String compositePath) {
+        try {
+            getInstance().startup(system, extensions, application, compositePath);
+        } catch (Exception e) {
+            throw new IllegalStateException(e);
+        }
+    }
+
+    /**
+     * Start the SCA Runtime with the given SCDL
+     * 
+     * @param application The URL for the application SCDL
+     */
+    public static void start(URL application, String compositePath) {
+        try {
+            getInstance().startup(null, null, application, compositePath);
+        } catch (Exception e) {
+            throw new IllegalStateException(e);
+        }
+    }
+
+    /**
+     * Start the SCA Runtime with the given SCDL
+     * 
+     * @param compositePath The path of the application SCDL
+     */
+    public static void start(String compositePath) {
+        try {
+            ClassLoader cl = Thread.currentThread().getContextClassLoader();
+            URL applicationURL = cl.getResource(compositePath);
+            getInstance().startup(null, null, applicationURL, compositePath);
+        } catch (Exception e) {
+            throw new IllegalStateException(e);
+        }
+    }
+
+    /**
+     * Start the SCA Runtime with the given SCDL
+     * 
+     * @param compositePath The path of the system SCDL
+     * @param compositePath The path of the application SCDL
+     */
+    public static void start(String system, String compositePath) {
+        try {
+            ClassLoader cl = Thread.currentThread().getContextClassLoader();
+            URL systemURL = cl.getResource(system);
+            URL applicationURL = cl.getResource(compositePath);
+            getInstance().startup(systemURL, null, applicationURL, compositePath);
+        } catch (Exception e) {
+            throw new IllegalStateException(e);
+        }
+    }
+
+    /**
+     * Get the ComponentContext by name
+     * 
+     * @param componentName
+     * @return
+     */
+    public static ComponentContext getComponentContext(String componentName) {
+        return getInstance().getContext(componentName);
+    }
+
+    /**
+     * Get access to a system service
+     * 
+     * @param serviceName
+     * @return
+     */
+    protected abstract Object getSystemService(String serviceName);
+
+    /**
+     * Stop the SCA Runtime
+     */
+    public static void stop() {
+        try {
+            getInstance().shutdown();
+        } catch (Exception e) {
+            throw new IllegalStateException(e);
+        } finally {
+            instance = null;
+        }
+    }
+
+    /**
+     * Look up the ComponentContext by name
+     * 
+     * @param componentName
+     * @return
+     */
+    protected abstract ComponentContext getContext(String componentName);
+
+    /**
+     * Start up the runtime
+     * 
+     * @param system The URL of the SCDL for tuscany system composite
+     * @param extensions The URLs of the SCDLs for tuscany extension composites
+     * @param application The URL of the SCDL for the application composite
+     * @param compositePath The path of the application composite relative to
+     *            the application URL
+     * @throws Exception
+     */
+    protected abstract void startup(URL system, URL[] extensions, URL application, String compositePath)
+        throws Exception;
+
+    /**
+     * Shutdown the runtime
+     * 
+     * @throws Exception
+     */
+    protected abstract void shutdown() throws Exception;
+}