Glassfish example source code file (MainClassLaunchable.java)

This example Glassfish source code file (MainClassLaunchable.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

appclientarchivist, appclientarchivist, applicationclientdescriptor, class, class, classloader, io, ioexception, ioexception, jar, jaroutputstream, log, logging, mainclasslaunchable, net, network, readablearchive, string, string, zipentry

The Glassfish MainClassLaunchable.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package org.glassfish.appclient.client.acc;

import com.sun.enterprise.deployment.Application;
import com.sun.enterprise.deployment.ApplicationClientDescriptor;
import com.sun.enterprise.deployment.archivist.AppClientArchivist;
import com.sun.enterprise.deployment.archivist.ArchivistFactory;
import com.sun.enterprise.deployment.deploy.shared.MemoryMappedArchive;
import com.sun.enterprise.deployment.util.XModuleType;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URLClassLoader;
import java.util.jar.Attributes;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.ZipEntry;
import org.glassfish.api.deployment.archive.ReadableArchive;
import org.jvnet.hk2.component.Habitat;
import org.xml.sax.SAXParseException;

/**
 * Represents a Launchable main class which the caller specifies by the
 * main class itself, rather than a facade JAR or an original developer-provided
 * JAR file.
 *
 * @author tjquinn
 */
public class MainClassLaunchable implements Launchable {

    private final Class mainClass;
    private ApplicationClientDescriptor acDesc = null;
    private ClassLoader classLoader = null;
    private AppClientArchivist archivist = null;
    private final Habitat habitat;

    MainClassLaunchable(final Habitat habitat, final Class mainClass) {
        super();
        this.mainClass = mainClass;
        this.habitat = habitat;
    }

    public Class getMainClass() throws ClassNotFoundException {
        return mainClass;
    }

    public ApplicationClientDescriptor getDescriptor(URLClassLoader loader) throws IOException, SAXParseException {
        /*
         * There is no developer-provided descriptor possible so just
         * use a default one.
         */
        if (acDesc == null) {
            ReadableArchive tempArchive = null;
            final ACCClassLoader tempLoader = new ACCClassLoader(loader.getURLs(), loader.getParent());
            tempArchive = createArchive(tempLoader, mainClass);
            final AppClientArchivist acArchivist = getArchivist(tempArchive, tempLoader);
            archivist.setClassLoader(tempLoader);
            archivist.setDescriptor(acDesc);
            archivist.setAnnotationProcessingRequested(true);
            acDesc = acArchivist.open(tempArchive);
            Application.createApplication(habitat, null, acDesc.getModuleDescriptor());
            acDesc.getApplication().setAppName(appNameFromMainClass(mainClass));
            this.classLoader = loader;
        }
        return acDesc;
    }

    private String appNameFromMainClass(final Class c) {
        return c.getName();
    }
    
//    private ReadableArchive createArchive(final ClassLoader loader,
//            final Class mainClass) throws IOException, URISyntaxException {
//        Manifest mf = new Manifest();
//        mf.getMainAttributes().put(Attributes.Name.MAIN_CLASS, mainClass.getName());
//        final File tempFile = File.createTempFile("acc", ".jar");
//        tempFile.deleteOnExit();
//        JarOutputStream jos = new JarOutputStream(
//                new BufferedOutputStream(new FileOutputStream(tempFile)), mf);
//        final String mainClassResourceName = mainClass.getName().replace('.', '/') + ".class";
//        final ZipEntry mainClassEntry = new ZipEntry(mainClassResourceName);
//        jos.putNextEntry(mainClassEntry);
//        InputStream is = loader.getResourceAsStream(mainClassResourceName);
//        int bytesRead;
//        byte[] buffer = new byte[1024];
//        while ( (bytesRead = is.read(buffer)) != -1) {
//            jos.write(buffer, 0, bytesRead);
//        }
//        is.close();
//        jos.closeEntry();
//        jos.close();
//
//        final InputJarArchive result = new InputJarArchive();
//        result.open(new URI("jar", tempFile.toURI().toASCIIString(), null));
//        return result;
//    }

    private ReadableArchive createArchive(final ClassLoader loader,
            final Class mainClass) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        Manifest mf = new Manifest();
        Attributes mainAttrs = mf.getMainAttributes();
        /*
         * Note - must set the version or the attributes won't write
         * themselves to the output stream!
         */
        mainAttrs.put(Attributes.Name.MANIFEST_VERSION, "1.0");
        mainAttrs.put(Attributes.Name.MAIN_CLASS, mainClass.getName());
        JarOutputStream jos = new JarOutputStream(baos, mf);

        final String mainClassResourceName = mainClass.getName().replace('.', '/') + ".class";
        final ZipEntry mainClassEntry = new ZipEntry(mainClassResourceName);
        jos.putNextEntry(mainClassEntry);
        InputStream is = loader.getResourceAsStream(mainClassResourceName);
        int bytesRead;
        byte[] buffer = new byte[1024];
        while ( (bytesRead = is.read(buffer)) != -1) {
            jos.write(buffer, 0, bytesRead);
        }
        is.close();
        jos.closeEntry();
        jos.close();

        MemoryMappedArchive mma = new MemoryMappedArchive(baos.toByteArray());
        /*
         * Some archive-related processing looks for the file type from the URI, so set it
         * to something.
         */
        mma.setURI(URI.create("file:///tempClient.jar"));

        return mma;
    }


    private AppClientArchivist getArchivist(final ReadableArchive clientRA,
            final ClassLoader classLoader) throws IOException {
        if (archivist == null) {
            ArchivistFactory af = Util.getArchivistFactory();
            /*
             * Get the archivist by type rather than by archive to avoid
             * having to set the URI to some fake URI that the archivist
             * factory would understand.
             */
            archivist = completeInit((AppClientArchivist) 
                    af.getArchivist(XModuleType.CAR));
        }
        return archivist;
    }

    private AppClientArchivist completeInit(final AppClientArchivist arch) {
            arch.setAnnotationProcessingRequested(true);
            return arch;
    }

    public void validateDescriptor() {
        archivist.validate(classLoader);
    }

    public URI getURI() {
        return null;
    }

    public String getAnchorDir() {
        return null;
    }
}