| /* |
| * 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.openjpa.enhance; |
| |
| import java.lang.instrument.Instrumentation; |
| import java.security.AccessController; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.openjpa.conf.OpenJPAConfiguration; |
| import org.apache.openjpa.conf.OpenJPAConfigurationImpl; |
| import org.apache.openjpa.lib.conf.Configuration; |
| import org.apache.openjpa.lib.conf.Configurations; |
| import org.apache.openjpa.lib.util.J2DoPrivHelper; |
| import org.apache.openjpa.lib.util.Options; |
| import org.apache.openjpa.util.ClassResolver; |
| |
| /** |
| * <p>Java agent that makes persistent classes work with OpenJPA at runtime. |
| * This is achieved by either running the enhancer on the classes as they |
| * are loaded, or by redefining the classes on the fly. |
| * The agent is launched at JVM startup from the command line:</p> |
| * |
| * <p><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:</p> |
| * |
| * <p><code>java -javaagent:openjpa.jar</code></p> |
| * |
| * <p>By default, if specified, the agent runs the OpenJPA enhancer on |
| * all classes listed in the first persistence unit as they are loaded, |
| * and redefines all other persistent classes when they are encountered. |
| * To disable enhancement at class-load time and rely solely on the |
| * redefinition logic, set the ClassLoadEnhancement flag to false. To |
| * disable redefinition and rely solely on pre-deployment or class-load |
| * enhancement, set the RuntimeRedefinition flag to false. |
| * </p> |
| * |
| * <p><code>java -javaagent:openjpa.jar=ClassLoadEnhancement=false</code></p> |
| * |
| * @author Abe White |
| * @author Patrick Linskey |
| */ |
| public class PCEnhancerAgent { |
| |
| public static void premain(String args, Instrumentation inst) { |
| Options opts = Configurations.parseProperties(args); |
| |
| if (opts.containsKey("ClassLoadEnhancement") || |
| opts.containsKey("classLoadEnhancement")) { |
| if (opts.getBooleanProperty( |
| "ClassLoadEnhancement", "classLoadEnhancement", true)) |
| registerClassLoadEnhancer(inst, opts); |
| } |
| else if (opts.containsKey("RuntimeEnhancement") || |
| opts.containsKey("runtimeEnhancement")) { |
| // Deprecated property setting |
| if (opts.getBooleanProperty( |
| "RuntimeEnhancement", "runtimeEnhancement", true)) |
| registerClassLoadEnhancer(inst, opts); |
| } else { |
| // if neither is set, then we should be turning it on. We need this |
| // logic instead of just a getBooleanProperty() because of the |
| // backwards-compat logic flow. |
| registerClassLoadEnhancer(inst, opts); |
| } |
| |
| if (opts.getBooleanProperty( |
| "RuntimeRedefinition", "runtimeRedefinition", true)) { |
| InstrumentationFactory.setInstrumentation(inst); |
| } else { |
| InstrumentationFactory.setDynamicallyInstallAgent(false); |
| } |
| } |
| |
| private static void registerClassLoadEnhancer(Instrumentation inst, |
| Options opts) { |
| List<String> anchors = Configurations. |
| getFullyQualifiedAnchorsInPropertiesLocation(opts); |
| for (String a : anchors) { |
| Options clonedOptions = (Options) opts.clone(); |
| clonedOptions.setProperty("properties", a); |
| OpenJPAConfiguration conf = new OpenJPAConfigurationImpl(); |
| Configurations.populateConfiguration(conf, clonedOptions); |
| // 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 = (ClassLoader) AccessController |
| .doPrivileged(J2DoPrivHelper |
| .newTemporaryClassLoaderAction((ClassLoader) AccessController |
| .doPrivileged(J2DoPrivHelper.getContextClassLoaderAction()) |
| )); |
| conf.setClassResolver(new ClassResolver() { |
| public ClassLoader getClassLoader(Class context, |
| ClassLoader env) { |
| return tmpLoader; |
| } |
| }); |
| conf.setReadOnly(Configuration.INIT_STATE_FREEZING); |
| conf.instantiateAll(); // avoid threading issues |
| |
| PCClassFileTransformer transformer = new PCClassFileTransformer |
| (conf.newMetaDataRepositoryInstance(), clonedOptions, |
| tmpLoader); |
| inst.addTransformer(transformer); |
| conf.close(); |
| } |
| } |
| } |