Jetty embedding revisited
This commit is contained in:
Claude Brisson
31
bootstrap/pom.xml
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31
bootstrap/pom.xml
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.jeudego.pairgoth</groupId>
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<artifactId>engine-parent</artifactId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<artifactId>bootstrap</artifactId>
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<packaging>jar</packaging>
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<description>Simple Bootstrap for the Server UberJar (when packaged in a WAR)</description>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-jar-plugin</artifactId>
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<configuration>
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<archive>
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<manifest>
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<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
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<mainClass>jetty.bootstrap.JettyBootstrap</mainClass>
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</manifest>
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</archive>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>
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55
bootstrap/src/main/java/jetty/bootstrap/JettyBootstrap.java
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55
bootstrap/src/main/java/jetty/bootstrap/JettyBootstrap.java
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//
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// ========================================================================
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// Copyright (c) Mort Bay Consulting Pty Ltd and others.
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// ------------------------------------------------------------------------
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// All rights reserved. This program and the accompanying materials
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// are made available under the terms of the Eclipse Public License v1.0
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// and Apache License v2.0 which accompanies this distribution.
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//
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// The Eclipse Public License is available at
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// http://www.eclipse.org/legal/epl-v10.html
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//
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// The Apache License v2.0 is available at
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// http://www.opensource.org/licenses/apache2.0.php
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//
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// You may elect to redistribute this code under either of these licenses.
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// ========================================================================
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//
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package jetty.bootstrap;
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import java.io.File;
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import java.io.IOException;
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import java.lang.reflect.Method;
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import java.net.URL;
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public class JettyBootstrap
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{
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public static void main(String[] args)
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{
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try
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{
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URL warLocation = JettyBootstrap.class.getProtectionDomain().getCodeSource().getLocation();
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if (warLocation == null)
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{
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throw new IOException("JettyBootstrap not discoverable");
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}
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LiveWarClassLoader clWar = new LiveWarClassLoader(warLocation);
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System.err.println("Using ClassLoader: " + clWar);
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Thread.currentThread().setContextClassLoader(clWar);
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File warFile = new File(warLocation.toURI());
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System.setProperty("org.eclipse.jetty.livewar.LOCATION",warFile.toPath().toRealPath().toString());
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Class<?> mainClass = Class.forName("org.jeudego.pairgoth.container.ServerMain",false,clWar);
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Method mainMethod = mainClass.getMethod("main",args.getClass());
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mainMethod.invoke(mainClass,new Object[] { args });
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}
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catch (Throwable t)
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{
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t.printStackTrace(System.err);
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System.exit(-1);
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}
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}
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}
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171
bootstrap/src/main/java/jetty/bootstrap/LiveWarClassLoader.java
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171
bootstrap/src/main/java/jetty/bootstrap/LiveWarClassLoader.java
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@@ -0,0 +1,171 @@
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//
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// ========================================================================
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// Copyright (c) Mort Bay Consulting Pty Ltd and others.
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// ------------------------------------------------------------------------
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// All rights reserved. This program and the accompanying materials
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// are made available under the terms of the Eclipse Public License v1.0
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// and Apache License v2.0 which accompanies this distribution.
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//
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// The Eclipse Public License is available at
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// http://www.eclipse.org/legal/epl-v10.html
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//
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// The Apache License v2.0 is available at
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// http://www.opensource.org/licenses/apache2.0.php
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//
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// You may elect to redistribute this code under either of these licenses.
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// ========================================================================
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//
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package jetty.bootstrap;
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import java.io.ByteArrayOutputStream;
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import java.io.Closeable;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.MalformedURLException;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.net.URL;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Enumeration;
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import java.util.List;
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import java.util.jar.JarFile;
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import java.util.zip.ZipEntry;
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public class LiveWarClassLoader extends ClassLoader implements Closeable
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{
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private static final String ID = LiveWarClassLoader.class.getSimpleName();
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private static final boolean DEBUG = Boolean.getBoolean("jetty.bootstrap.debug");
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private static final String CLASSES_BASE = "WEB-INF/jetty-server/";
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private final URI warFileUri;
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private JarFile warFile;
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public LiveWarClassLoader(URL warFileUrl) throws URISyntaxException, IOException
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{
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this.warFileUri = warFileUrl.toURI();
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this.warFile = new JarFile(new File(warFileUri));
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}
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public void close() throws IOException
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{
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warFile.close();
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}
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private void debug(String format, Object... args)
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{
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if (DEBUG)
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{
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System.err.printf('[' + ID + "] " + format + "%n",args);
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}
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}
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@Override
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protected Class<?> findClass(String name) throws ClassNotFoundException
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{
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debug("findClass: %s",name);
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String path = name.replace('.','/').concat(".class");
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ZipEntry entry = findEntry(path);
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if (entry != null)
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{
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try
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{
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return loadClass(name,entry);
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}
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catch (IOException e)
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{
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throw new ClassNotFoundException(name,e);
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}
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}
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else
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{
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throw new ClassNotFoundException(name);
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}
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}
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private ZipEntry findEntry(String name)
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{
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StringBuilder path = new StringBuilder();
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path.append(CLASSES_BASE);
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if (name.charAt(0) == '/')
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{
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path.append(name.substring(1));
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}
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else
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{
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path.append(name);
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}
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ZipEntry entry = warFile.getEntry(path.toString());
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debug("findEntry(%s) %s => %s",name,path,entry);
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return entry;
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}
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@Override
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protected URL findResource(String name)
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{
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debug("findResource: %s",name);
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ZipEntry entry = findEntry(name);
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if (entry != null)
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{
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try
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{
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return URI.create("jar:" + this.warFileUri.toASCIIString() + "!/" + entry.getName()).toURL();
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}
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catch (MalformedURLException e)
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{
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e.printStackTrace(System.err);
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return null;
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}
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}
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return null;
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}
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@Override
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protected Enumeration<URL> findResources(String name) throws IOException
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{
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debug("findResources: %s",name);
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List<URL> urls = new ArrayList<>();
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URL self = findResource(name);
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if (self != null)
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{
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urls.add(self);
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}
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if (getParent() != null)
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{
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Enumeration<URL> parent = getParent().getResources(name);
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while (parent.hasMoreElements())
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{
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urls.add(parent.nextElement());
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}
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}
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return Collections.enumeration(urls);
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}
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private Class<?> loadClass(String name, ZipEntry entry) throws IOException
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{
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try (InputStream in = warFile.getInputStream(entry); ByteArrayOutputStream out = new ByteArrayOutputStream())
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{
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int len = 0;
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int bufferSize = 4096;
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byte[] buffer = new byte[bufferSize];
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while (true)
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{
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len = in.read(buffer,0,bufferSize);
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if (len < 0)
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break;
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out.write(buffer,0,len);
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}
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byte[] classBytes = out.toByteArray();
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return defineClass(name,classBytes,0,classBytes.length);
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}
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}
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@Override
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public String toString()
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{
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return String.format("%s[%s]",this.getClass().getName(),this.warFileUri);
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}
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}
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