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/*
* 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.kernel;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.AccessController;
import org.apache.openjpa.conf.BrokerFactoryValue;
import org.apache.openjpa.lib.conf.ConfigurationProvider;
import org.apache.openjpa.lib.conf.MapConfigurationProvider;
import org.apache.openjpa.lib.conf.ProductDerivations;
import org.apache.openjpa.lib.util.J2DoPrivHelper;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.util.InternalException;
import org.apache.openjpa.util.OpenJPAException;
import org.apache.openjpa.util.UserException;
/**
* Helper methods for acquiring {@link BrokerFactory} objects
*
* @since 0.4.0.0
*/
public class Bootstrap {
private static final Class[] FACTORY_ARGS =
new Class[]{ ConfigurationProvider.class };
private static Localizer s_loc = Localizer.forPackage(Bootstrap.class);
/**
* Return a new factory for the default configuration.
*/
public static BrokerFactory newBrokerFactory() {
return Bootstrap.newBrokerFactory(null, null);
}
/**
* Return a new factory for the given configuration. The classloader
* will be used to load the factory class. If no classloader is given,
* the thread's context classloader is used.
*/
public static BrokerFactory newBrokerFactory(ConfigurationProvider conf,
ClassLoader loader) {
try {
return invokeFactory(conf, loader, "newInstance");
} catch (InvocationTargetException ite) {
Throwable cause = ite.getTargetException();
if (cause instanceof OpenJPAException)
throw (OpenJPAException) cause;
throw new InternalException(s_loc.get("new-brokerfactory-excep",
getFactoryClassName(conf, loader)), cause);
} catch (Exception e) {
throw new UserException(s_loc.get("bad-new-brokerfactory",
getFactoryClassName(conf, loader)), e).setFatal(true);
}
}
/**
* Return a pooled factory for the default configuration.
*/
public static BrokerFactory getBrokerFactory() {
return Bootstrap.getBrokerFactory(null, null);
}
/**
* Return a pooled factory for the given configuration. The classloader
* will be used to load the factory class. If no classloader is given,
* the thread's context classloader is used.
*/
public static BrokerFactory getBrokerFactory(ConfigurationProvider conf,
ClassLoader loader) {
try {
return invokeFactory(conf, loader, "getInstance");
} catch (InvocationTargetException ite) {
Throwable cause = ite.getTargetException();
if (cause instanceof OpenJPAException)
throw (OpenJPAException) cause;
throw new InternalException(s_loc.get("brokerfactory-excep",
getFactoryClassName(conf, loader)), cause);
} catch (Exception e) {
throw new UserException(s_loc.get("bad-brokerfactory",
getFactoryClassName(conf, loader)), e).setFatal(true);
}
}
private static BrokerFactory invokeFactory(ConfigurationProvider conf,
ClassLoader loader, String methodName)
throws InvocationTargetException, NoSuchMethodException,
IllegalAccessException {
if (conf == null)
conf = new MapConfigurationProvider();
ProductDerivations.beforeConfigurationConstruct(conf);
Class cls = getFactoryClass(conf, loader);
Method meth;
try {
meth = cls.getMethod(methodName, FACTORY_ARGS);
} catch (NoSuchMethodException nsme) {
// handle cases where there is a mismatch between loaders by falling
// back to the configuration's class loader for broker resolution
cls = getFactoryClass(conf,
(ClassLoader) AccessController.doPrivileged(
J2DoPrivHelper.getClassLoaderAction(conf.getClass())));
meth = cls.getMethod(methodName, FACTORY_ARGS);
}
return (BrokerFactory) meth.invoke(null, new Object[]{ conf });
}
private static String getFactoryClassName(ConfigurationProvider conf,
ClassLoader loader) {
try {
return getFactoryClass(conf, loader).getName();
} catch (Exception e) {
return "<" + e.toString() + ">";
}
}
/**
* Instantiate the factory class designated in properties.
*/
private static Class getFactoryClass(ConfigurationProvider conf,
ClassLoader loader) {
if (loader == null)
loader = (ClassLoader) AccessController.doPrivileged(
J2DoPrivHelper.getContextClassLoaderAction());
Object cls = BrokerFactoryValue.get(conf);
if (cls instanceof Class)
return (Class) cls;
BrokerFactoryValue value = new BrokerFactoryValue();
value.setString((String) cls);
String clsName = value.getClassName();
if (clsName == null)
throw new UserException(s_loc.get("no-brokerfactory",
conf.getProperties())).setFatal(true);
try {
return Class.forName(clsName, true, loader);
} catch (Exception e) {
throw new UserException(s_loc.get("bad-brokerfactory-class",
clsName), e).setFatal(true);
}
}
}
