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Diffstat (limited to '')
-rw-r--r-- | branches/sca-java-1.5/modules/extension-helper/src/main/java/org/apache/tuscany/sca/extension/helper/impl/DiscoveryUtils.java | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/branches/sca-java-1.5/modules/extension-helper/src/main/java/org/apache/tuscany/sca/extension/helper/impl/DiscoveryUtils.java b/branches/sca-java-1.5/modules/extension-helper/src/main/java/org/apache/tuscany/sca/extension/helper/impl/DiscoveryUtils.java new file mode 100644 index 0000000000..720d409a44 --- /dev/null +++ b/branches/sca-java-1.5/modules/extension-helper/src/main/java/org/apache/tuscany/sca/extension/helper/impl/DiscoveryUtils.java @@ -0,0 +1,113 @@ +/* + * 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.extension.helper.impl; + +import java.io.IOException; +import java.lang.reflect.Constructor; +import java.lang.reflect.InvocationTargetException; +import java.util.ArrayList; +import java.util.List; +import java.util.Set; + +import org.apache.tuscany.sca.core.ExtensionPointRegistry; +import org.apache.tuscany.sca.extensibility.ServiceDeclaration; +import org.apache.tuscany.sca.extensibility.ServiceDiscovery; + +/** + * Discovers Activators in the classpath using the J2SE + * jar file extensions for Service Provider discovery + * + * @version $Rev$ $Date$ + */ +public class DiscoveryUtils { + + @SuppressWarnings("unchecked") + public static <T> List<T> discoverActivators(Class<T> activatorClass, ExtensionPointRegistry registry) { + List<T> activators; + try { + Set<ServiceDeclaration> activatorClasses = + ServiceDiscovery.getInstance().getServiceDeclarations(activatorClass); + activators = new ArrayList<T>(); + for (ServiceDeclaration declaration : activatorClasses) { + try { + Class<T> c = (Class<T>)declaration.loadClass(); + activators.add(c.cast(instantiateActivator(c, registry))); + } catch (Throwable e) { + e.printStackTrace(); // TODO: log + } + } + } catch (IOException e) { + throw new RuntimeException(e); + } + return activators; + } + + static Object instantiateActivator(Class activator, ExtensionPointRegistry registry) { + Constructor[] cs = activator.getConstructors(); + if (cs.length != 1) { + throw new RuntimeException("Activator must have only one constructors"); + } + + Class<?>[] paramTypes = cs[0].getParameterTypes(); + Object[] extensions = new Object[paramTypes.length]; + + for (int i = 0; i < paramTypes.length; i++) { + if ("org.apache.tuscany.sca.host.http.ServletHost".equals(paramTypes[i].getName())) { + extensions[i] = getServletHost(registry); + } else { + extensions[i] = registry.getExtensionPoint(paramTypes[i]); + } + } + + try { + + return cs[0].newInstance(extensions); + + } catch (Exception e) { + throw new RuntimeException(e); + } + } + + private static Object getServletHost(ExtensionPointRegistry registry) { + try { + + Class<?> servletHostEPClass = Class.forName("org.apache.tuscany.sca.host.http.ServletHostExtensionPoint"); + Object servletHostEP = registry.getExtensionPoint(servletHostEPClass); + Class<?> extensibleServletHost = Class.forName("org.apache.tuscany.sca.host.http.ExtensibleServletHost"); + return extensibleServletHost.getConstructor(new Class[] {servletHostEPClass}).newInstance(servletHostEP); + + } catch (ClassNotFoundException e) { + throw new RuntimeException(e); + } catch (IllegalArgumentException e) { + throw new RuntimeException(e); + } catch (SecurityException e) { + throw new RuntimeException(e); + } catch (InstantiationException e) { + throw new RuntimeException(e); + } catch (IllegalAccessException e) { + throw new RuntimeException(e); + } catch (InvocationTargetException e) { + throw new RuntimeException(e); + } catch (NoSuchMethodException e) { + throw new RuntimeException(e); + } + } + +} |