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/*
 * Copyright (c) 2013, Joshua Kaplan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 * following conditions are met:
 *  - Redistributions of source code must retain the above copyright notice, this list of conditions and the following
 *    disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other materials provided with the distribution.
 *  - Neither the name of matlabcontrol nor the names of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package matlabcontrol.internal;

import java.io.File;
import java.net.MalformedURLException;
import java.rmi.server.RMIClassLoader;
import java.rmi.server.RMIClassLoaderSpi;

/**
 * Internal Use Only
 * 

* This class must be public so that it can be created via reflection by {@link RemoteClassLoader}. If it were package * private it would result in an {@link IllegalAccessError} because only classes in the same package as a package * private class may construct it (even via reflection). It has been placed in the {@code matlabcontrol.internal} * package to make it clear it is not intended for use by users of matlabcontrol. *

* A custom service provider for the RMI class loader. Allows for loading classes sent from the external JVM and * providing annotations so that the external JVM may load classes defined only in the MATLAB JVM. Loading classes from * the external JVM could be accomplished by setting {@code java.rmi.server.codebase} property in the external JVM but * that could interfere with other uses of RMI in the application. There is no way to always sending the correct * annotations without this custom rmi class loader spi. While the {@code java.rmi.server.codebase} property could be * set in the MATLAB JVM, the property is checked only at load time. This would mean that class definitions added * dynamically with {@code javaaddpath} could not be sent. * * @since 4.0.0 * * @author Joshua Kaplan * */ public class MatlabRMIClassLoaderSpi extends RMIClassLoaderSpi { /** * Loading of classes is delegated to the default {@link RMIClassLoaderSpi}. */ private final RMIClassLoaderSpi _delegateLoaderSpi = RMIClassLoader.getDefaultProviderInstance(); /** * The codebase of the external virtual machine which has a proxy that can interact with this session of MATLAB. * This is done instead of setting the {@code java.rmi.server.codebase} property so that matlabcontrol does not * interfere with any other uses of RMI in the application. */ private static volatile String _remoteCodebase = null; /** * Sets the codebase of the currently connected external JVM. This should be called only once per connection to an * external JVM and should occur before users of the API can send objects over RMI. * * @param remoteCodebase */ public static void setCodebase(String remoteCodebase) { _remoteCodebase = remoteCodebase; } @Override public Class loadClass(String codebase, String name, ClassLoader defaultLoader) throws MalformedURLException, ClassNotFoundException { return _delegateLoaderSpi.loadClass(_remoteCodebase, name, defaultLoader); } @Override public Class loadProxyClass(String codebase, String[] interfaces, ClassLoader defaultLoader) throws MalformedURLException, ClassNotFoundException { return _delegateLoaderSpi.loadProxyClass(_remoteCodebase, interfaces, defaultLoader); } @Override public ClassLoader getClassLoader(String codebase) throws MalformedURLException { return _delegateLoaderSpi.getClassLoader(_remoteCodebase); } /** * {@inheritDoc} *

* The returned annotation becomes the {@code codebase} argument in * {@link #loadClass(java.lang.String, java.lang.String, java.lang.ClassLoader)} when the {@code RMIClassLoaderSpi} * in the receiving JVM attempts to load {@code clazz}. This allows for classes defined in MATLAB but not in the * receiving JVM to find and load the class definition. * * @param clazz * @return */ @Override public String getClassAnnotation(Class clazz) { if (clazz == null) { throw new NullPointerException("class may not be null"); } String annotation = null; //If the class has a code source, meaning it is not part of the Java Runtime Environment if (clazz.getProtectionDomain().getCodeSource() != null) { //This convoluted way of determining the code source location is necessary due to a bug in early versions of //Java 6 on Windows (such as what is used by MATLAB R2007b) which puts a space in the code source's URL. //A space in the URL will cause the receiver of this annotation to treat it as a path separator, which would //be very problematic and likely cause invalid protocol exceptions. try { File file = new File(clazz.getProtectionDomain().getCodeSource().getLocation().getPath()); annotation = file.toURI().toURL().toString(); } catch (MalformedURLException e) {} } return annotation; } }




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