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The ACT full stack MVC framework
package act.boot.server;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* Licensed 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.
* #L%
*/
import act.Act;
import act.asm.ClassReader;
import act.asm.ClassWriter;
import act.boot.PluginClassProvider;
import act.boot.app.FullStackAppBootstrapClassLoader;
import act.util.ByteCodeVisitor;
import act.util.Jars;
import org.osgl.$;
import org.osgl.logging.L;
import org.osgl.logging.Logger;
import org.osgl.util.C;
import org.osgl.util.E;
import java.io.File;
import java.lang.reflect.Modifier;
import java.util.*;
import static act.Constants.*;
/**
* This class loader is responsible for loading Act classes
*/
public class ServerBootstrapClassLoader extends ClassLoader implements PluginClassProvider {
private static Logger logger = L.get(ServerBootstrapClassLoader.class);
protected final Class PLUGIN_CLASS;
private File lib;
private File plugin;
private Map libBC = new HashMap<>();
private Map pluginBC = new HashMap<>();
private List> pluginClasses = new ArrayList<>();
public ServerBootstrapClassLoader(ClassLoader parent) {
super(parent);
preload();
PLUGIN_CLASS = $.classForName("act.plugin.Plugin", this);
}
public ServerBootstrapClassLoader() {
this(_getParent());
}
private static ClassLoader _getParent() {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (null == cl) {
cl = ClassLoader.getSystemClassLoader();
}
return cl;
}
protected void preload() {
String actHome = System.getProperty(ACT_HOME);
if (null == actHome) {
actHome = System.getenv(ACT_HOME);
}
if (null == actHome) {
actHome = guessHome();
}
File home = new File(actHome);
lib = new File(home, "lib");
plugin = new File(home, "plugin");
verifyHome();
buildIndex();
}
private String guessHome() {
return new File(".").getAbsolutePath();
}
private void verifyHome() {
if (!verifyDir(lib) || !verifyDir(plugin)) {
throw E.unexpected("Cannot load Act: can't find lib or plugin dir");
}
}
private boolean verifyDir(File dir) {
return dir.exists() && dir.canExecute() && dir.isDirectory();
}
private void buildIndex() {
libBC.putAll(Jars.buildClassNameIndex(lib));
pluginBC.putAll(Jars.buildClassNameIndex(plugin));
File actJar = Jars.probeJarFile(Act.class);
if (null == actJar) {
logger.warn("Cannot find jar file for Act");
} else {
pluginBC.putAll(Jars.buildClassNameIndex(C.list(actJar)));
}
}
@Override
protected Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
Class c = findLoadedClass(name);
if (c != null) {
return c;
}
if (!protectedClasses.contains(name)) {
c = loadActClass(name, resolve, false);
}
if (null == c) {
return super.loadClass(name, resolve);
} else {
return c;
}
}
public List> pluginClasses() {
if (pluginClasses.isEmpty()) {
for (String className : C.list(pluginBC.keySet())) {
Class c = loadActClass(className, true, true);
assert null != c;
int modifier = c.getModifiers();
if (Modifier.isAbstract(modifier) || !Modifier.isPublic(modifier) || c.isInterface()) {
continue;
}
if (PLUGIN_CLASS.isAssignableFrom(c)) {
pluginClasses.add(c);
}
}
}
return C.list(pluginClasses);
}
protected byte[] tryLoadResource(String name) {
return null;
}
protected Class loadActClass(String name, boolean resolve, boolean pluginOnly) {
boolean fromPlugin = false;
byte[] ba = pluginBC.remove(name);
if (null == ba) {
if (!pluginOnly) {
ba = libBC.remove(name);
}
} else {
fromPlugin = true;
}
if (null == ba) {
ba = tryLoadResource(name);
}
if (null == ba) {
if (pluginOnly) {
return findLoadedClass(name);
}
return null;
}
Class c = null;
if (!name.startsWith(ACT_PKG) || name.startsWith(ASM_PKG)) {
// skip bytecode enhancement for asm classes or non Act classes
c = super.defineClass(name, ba, 0, ba.length, DOMAIN);
}
if (null == c) {
$.Var cw = $.val(null);
ByteCodeVisitor enhancer = Act.enhancerManager().generalEnhancer(name, cw);
if (null == enhancer) {
c = super.defineClass(name, ba, 0, ba.length, DOMAIN);
} else {
ClassWriter w = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
cw.set(w);
enhancer.commitDownstream();
ClassReader r;
r = new ClassReader(ba);
try {
r.accept(enhancer, 0);
byte[] baNew = w.toByteArray();
c = super.defineClass(name, baNew, 0, baNew.length, DOMAIN);
} catch (RuntimeException e) {
throw e;
} catch (Error e) {
throw e;
} catch (Exception e) {
throw E.unexpected("Error processing class " + name);
}
}
}
if (resolve) {
super.resolveClass(c);
}
return c;
}
public Class createClass(String name, byte[] b) throws ClassFormatError {
return super.defineClass(name, b, 0, b.length, DOMAIN);
}
private static java.security.ProtectionDomain DOMAIN;
static {
DOMAIN = (java.security.ProtectionDomain)
java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction() {
public Object run() {
return ServerBootstrapClassLoader.class.getProtectionDomain();
}
});
}
private static final Set protectedClasses = C.set(
ServerBootstrapClassLoader.class.getName(),
FullStackAppBootstrapClassLoader.class.getName(),
PluginClassProvider.class.getName()
//Plugin.class.getName(),
//ClassFilter.class.getName()
);
}