| /* |
| * Copyright 2006 The Apache Software Foundation. |
| * |
| * Licensed 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.openjpa.enhance; |
| |
| import java.lang.instrument.Instrumentation; |
| |
| import org.apache.openjpa.conf.OpenJPAConfiguration; |
| import org.apache.openjpa.conf.OpenJPAConfigurationImpl; |
| import org.apache.openjpa.lib.conf.Configurations; |
| import org.apache.openjpa.lib.util.Options; |
| import org.apache.openjpa.lib.util.TemporaryClassLoader; |
| import org.apache.openjpa.util.ClassResolver; |
| |
| /** |
| * Java agent that makes persistent classes implement the |
| * {@link PersistenceCapable} interface at runtime. The agent is launched |
| * at JVM startup from the command line: |
| * |
| * <code>java -javaagent:openjpa.jar[=<options>]</code> |
| * The options string should be formatted as a OpenJPA plugin, and may |
| * contain any properties understood by the OpenJPA enhancer or any |
| * configuration properties. For example: |
| * |
| * <code>java -javaagent:openjpa.jar</code> |
| * |
| * @author Abe White |
| */ |
| public class PCEnhancerAgent { |
| |
| public static void premain(String args, Instrumentation inst) { |
| OpenJPAConfiguration conf = new OpenJPAConfigurationImpl(); |
| Options opts = Configurations.parseProperties(args); |
| Configurations.populateConfiguration(conf, opts); |
| // don't allow connections |
| conf.setConnectionUserName(null); |
| conf.setConnectionPassword(null); |
| conf.setConnectionURL(null); |
| conf.setConnectionDriverName(null); |
| conf.setConnectionFactoryName(null); |
| // set single class resolver |
| final ClassLoader tmpLoader = new TemporaryClassLoader(Thread. |
| currentThread().getContextClassLoader()); |
| conf.setClassResolver(new ClassResolver() { |
| public ClassLoader getClassLoader(Class context, ClassLoader env) { |
| return tmpLoader; |
| } |
| }); |
| conf.setReadOnly(true); |
| conf.instantiateAll(); // avoid threading issues |
| |
| PCClassFileTransformer transformer = new PCClassFileTransformer |
| (conf.newMetaDataRepositoryInstance(), opts, tmpLoader); |
| inst.addTransformer(transformer); |
| } |
| } |