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A strong typed high performance Java Template engine with .Net Razor like syntax
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/*
* Copyright (C) 2013 The Rythm Engine project
* Gelin Luo
*
* 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 com.greenlaw110.rythm.internal.compiler;
import com.greenlaw110.rythm.Rythm;
import com.greenlaw110.rythm.RythmEngine;
import com.greenlaw110.rythm.conf.RythmConfiguration;
import com.greenlaw110.rythm.conf.RythmConfigurationKey;
import com.greenlaw110.rythm.extension.IByteCodeHelper;
import com.greenlaw110.rythm.logger.ILogger;
import com.greenlaw110.rythm.logger.Logger;
import com.greenlaw110.rythm.sandbox.RythmSecurityManager;
import com.greenlaw110.rythm.template.ITemplate;
import com.greenlaw110.rythm.utils.IO;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.lang.instrument.ClassDefinition;
import java.security.ProtectionDomain;
import java.util.*;
import java.util.concurrent.atomic.AtomicLong;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Created by IntelliJ IDEA.
* User: luog
* Date: 18/01/12
* Time: 9:01 PM
* To change this template use File | Settings | File Templates.
*/
public class TemplateClassLoader extends ClassLoader {
private static final ILogger logger = Logger.get(TemplateClass.class);
public static class ClassStateHashCreator {
private final Pattern classDefFinderPattern = Pattern.compile("\\s+class\\s([a-zA-Z0-9_]+)\\s+");
private static class FileWithClassDefs {
private final File file;
private final long size;
private final long lastModified;
private final String classDefs;
private FileWithClassDefs(File file, String classDefs) {
this.file = file;
this.classDefs = classDefs;
// store size and time for this file..
size = file.length();
lastModified = file.lastModified();
}
/**
* @return true if file has changed on disk
*/
public boolean fileNotChanges() {
return size == file.length() && lastModified == file.lastModified();
}
public String getClassDefs() {
return classDefs;
}
}
private final Map classDefsInFileCache = new HashMap();
public synchronized int computePathHash(File... paths) {
StringBuffer buf = new StringBuffer();
for (File file : paths) {
scan(buf, file);
}
// TODO: should use better hashing-algorithm.. MD5? SHA1?
// I think hashCode() has too many collisions..
return buf.toString().hashCode();
}
private void scan(StringBuffer buf, File current) {
if (!current.isDirectory()) {
if (current.getName().endsWith(".java")) {
buf.append(getClassDefsForFile(current));
}
} else if (!current.getName().startsWith(".")) {
// TODO: we could later optimizie it further if we check if the entire folder is unchanged
File[] fa = current.listFiles();
if (null != fa) {
for (File file : current.listFiles()) {
scan(buf, file);
}
}
}
}
private String getClassDefsForFile(File file) {
FileWithClassDefs fileWithClassDefs = classDefsInFileCache.get(file);
if (fileWithClassDefs != null && fileWithClassDefs.fileNotChanges()) {
// found the file in cache and it has not changed on disk
return fileWithClassDefs.getClassDefs();
}
// didn't find it or it has changed on disk
// we must re-parse it
StringBuilder buf = new StringBuilder();
Matcher matcher = classDefFinderPattern.matcher(IO.readContentAsString(file));
buf.append(file.getName());
buf.append("(");
while (matcher.find()) {
buf.append(matcher.group(1));
buf.append(",");
}
buf.append(")");
String classDefs = buf.toString();
// store it in cache
classDefsInFileCache.put(file, new FileWithClassDefs(file, classDefs));
return classDefs;
}
}
private final ClassStateHashCreator classStateHashCreator = new ClassStateHashCreator();
/**
* Each unique instance of this class represent a State of the TemplateClassLoader.
* When some classCache is reloaded, them the TemplateClassLoader get a new state.
*
* This makes it easy for other parts of Play to cache stuff based on the
* the current State of the TemplateClassLoader..
*
* They can store the reference to the current state, then later, before reading from cache,
* they could check if the state of the TemplateClassLoader has changed..
*/
public static class TemplateClassloaderState {
private static AtomicLong nextStateValue = new AtomicLong();
private final long currentStateValue = nextStateValue.getAndIncrement();
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
TemplateClassloaderState that = (TemplateClassloaderState) o;
return (currentStateValue == that.currentStateValue);
}
@Override
public int hashCode() {
return (int) (currentStateValue ^ (currentStateValue >>> 32));
}
}
/**
* A representation of the current state of the TemplateClassLoader.
* It gets a new value each time the state of the classloader changes.
*/
public TemplateClassloaderState currentState = new TemplateClassloaderState();
/**
* This protection domain applies to all loaded classCache.
*/
public ProtectionDomain protectionDomain;
public RythmEngine engine;
private RythmConfiguration conf;
private static ClassLoader getDefParent(RythmEngine engine) {
return engine.conf().get(RythmConfigurationKey.ENGINE_CLASS_LOADER_PARENT_IMPL);
}
public TemplateClassLoader(RythmEngine engine) {
this(getDefParent(engine), engine);
}
public TemplateClassLoader(ClassLoader parent, RythmEngine engine) {
super(parent);
this.engine = engine;
this.conf = engine.conf();
for (TemplateClass tc : engine.classes().all()) {
tc.uncompile();
}
pathHash = computePathHash();
// try {
// CodeSource codeSource = new CodeSource(new URL("file:" + Play.applicationPath.getAbsolutePath()), (Certificate[]) null);
// Permissions permissions = new Permissions();
// permissions.add(new AllPermission());
// protectionDomain = new ProtectionDomain(codeSource, permissions);
// } catch (MalformedURLException e) {
// throw new UnexpectedException(e);
// }
}
private static final ThreadLocal sandboxPassword = new ThreadLocal();
public static void setSandboxPassword(String password) {
sandboxPassword.set(password);
}
@Override
protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
// init secure context for sandbox
SecurityManager sm;
RythmSecurityManager rsm = null;
String pass = null;
if (Rythm.insideSandbox()) {
if (conf.restrictedClasses().contains(name)) {
throw new ClassNotFoundException("Access to class " + name + " is restricted in sandbox mode");
}
sm = System.getSecurityManager();
if (null != sm && sm instanceof RythmSecurityManager) {
rsm = (RythmSecurityManager) sm;
pass = sandboxPassword.get();
}
}
TemplateClass tc = engine.classes().clsNameIdx.get(name);
if (null == tc) {
// it's not a template class, let's try to find already loaded one
Class c = findLoadedClass(name);
if (c != null) {
return c;
}
}
// First check if it's an application Class
Class TemplateClass = loadTemplateClass(name);
if (TemplateClass != null) {
if (resolve) {
resolveClass(TemplateClass);
}
return TemplateClass;
}
// Delegate to the classic classloader
boolean unlockSM = /*engine.isDevMode() && */null != rsm;
try {
// release sandbox password if running inside sandbox in order to load
// application classes when running is dev mode
if (unlockSM) {
rsm.unlock(pass);
}
return super.loadClass(name, resolve);
} finally {
if (unlockSM) {
rsm.lock(pass);
}
}
}
@SuppressWarnings("unchecked")
private Class loadTemplateClass(String name) {
Class maybeAlreadyLoaded = findLoadedClass(name);
if (maybeAlreadyLoaded != null) {
return maybeAlreadyLoaded;
}
long start = System.currentTimeMillis();
TemplateClass templateClass = engine.classes().getByClassName(name);
if (templateClass != null) {
if (templateClass.isDefinable()) {
return templateClass.javaClass;
}
byte[] bc = templateClass.enhancedByteCode;//bCache.getBytecode(name, templateClass.javaSource);
if (!templateClass.isClass()) {
definePackage(templateClass.getPackage(), null, null, null, null, null, null, null);
} else {
loadPackage(name);
}
if (bc != null) {
//templateClass.enhancedByteCode = bc;
templateClass.javaClass = (Class) defineClass(templateClass.name(), templateClass.enhancedByteCode, 0, templateClass.enhancedByteCode.length, protectionDomain);
resolveClass(templateClass.javaClass);
if (!templateClass.isClass()) {
templateClass.javaPackage = templateClass.javaClass.getPackage();
}
if (logger.isTraceEnabled()) {
logger.trace("%sms to load class %s from clsNameIdx", System.currentTimeMillis() - start, name);
}
return templateClass.javaClass;
}
if (templateClass.javaByteCode != null || templateClass.compile() != null) {
templateClass.enhance();
templateClass.javaClass = (Class) defineClass(templateClass.name(), templateClass.enhancedByteCode, 0, templateClass.enhancedByteCode.length, protectionDomain);
resolveClass(templateClass.javaClass);
if (!templateClass.isClass()) {
templateClass.javaPackage = templateClass.javaClass.getPackage();
}
if (logger.isTraceEnabled()) {
logger.trace("%sms to load class %s", System.currentTimeMillis() - start, name);
}
return templateClass.javaClass;
}
engine.classes().remove(name);
} else if (name.lastIndexOf(TemplateClass.CN_SUFFIX) == -1) {
return null;
} else {
int pos = name.indexOf("$");
if (-1 != pos) {
// should be an inner class, let's try to create it load it from cache
// 1. find the root class
String parentCN = name.substring(0, pos);
TemplateClass parent = engine.classes().getByClassName(parentCN);
if (null == parent) {
throw new RuntimeException("Cannot find inner class def: " + name);
}
TemplateClass tc = TemplateClass.createInnerClass(name, null, parent);
engine.classCache().loadTemplateClass(tc);
byte[] bc = tc.enhancedByteCode;
if (null == bc) {
// inner class byte code cache missed some how, let's try to recover it
while ((null != parent) && parent.isInner()) {
parent = parent.root();
}
if (null == parent) {
throw new RuntimeException("Unexpected: cannot find the root class of inner class: " + name);
}
parent.reset();
parent.refresh(true);
parent.compile();
// now try again and see if we can find the class definition
tc = engine.classes().getByClassName(name);
Class c = tc.javaClass;
if (null != c) return c;
bc = tc.enhancedByteCode;
if (null == bc) {
throw new RuntimeException("Cannot find bytecode cache for inner class: " + name);
}
}
tc.javaClass = (Class) defineClass(tc.name(), bc, 0, bc.length, protectionDomain);
return tc.javaClass;
}
}
return null;
}
private String getPackageName(String name) {
int dot = name.lastIndexOf('.');
return dot > -1 ? name.substring(0, dot) : "";
}
private void loadPackage(String className) {
// find the package class name
int symbol = className.indexOf("$");
if (symbol > -1) {
className = className.substring(0, symbol);
}
symbol = className.lastIndexOf(".");
if (symbol > -1) {
className = className.substring(0, symbol) + ".package-info";
} else {
className = "package-info";
}
if (findLoadedClass(className) == null) {
loadTemplateClass(className);
}
}
private Set notFoundTypes = null;
private boolean typeNotFound(String name) {
if (null == notFoundTypes) {
notFoundTypes = engine.classes().compiler.notFoundTypes;
}
return notFoundTypes.contains(name);
}
private void setTypeNotFound(String name) {
if (null == notFoundTypes) {
notFoundTypes = engine.classes().compiler.notFoundTypes;
}
if (engine.isProdMode()) {
notFoundTypes.add(name);
} else if (name.matches("^(java\\.|play\\.|com\\.greenlaw110\\.).*")) {
notFoundTypes.add(name);
}
}
/**
* Search for the byte code of the given class.
*/
protected byte[] getClassDefinition(final String name0) {
if (typeNotFound(name0)) return null;
byte[] ba = null;
String name = name0.replace(".", "/") + ".class";
InputStream is = getResourceAsStream(name);
if (null != is) {
try {
ByteArrayOutputStream os = new ByteArrayOutputStream();
byte[] buffer = new byte[8192];
int count;
while ((count = is.read(buffer, 0, buffer.length)) > 0) {
os.write(buffer, 0, count);
}
ba = os.toByteArray();
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
try {
is.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
if (null == ba) {
IByteCodeHelper helper = engine.conf().byteCodeHelper();
if (null != helper) {
ba = helper.findByteCode(name0);
}
}
if (null == ba) {
setTypeNotFound(name0);
}
return ba;
}
public void detectChange(TemplateClass tc) {
if (engine.isProdMode() && null != tc.name()) return;
if (!tc.refresh()) return;
if (tc.compile() == null) {
engine.classes().remove(tc);
currentState = new TemplateClassloaderState();
} else {
throw new ClassReloadException("Need reload");
}
}
/**
* Detect Template changes
*/
public void detectChanges() {
if (engine.isProdMode()) return;
// Now check for file modification
List modifieds = new ArrayList();
for (TemplateClass tc : engine.classes().all()) {
if (tc.refresh()) modifieds.add(tc);
}
Set modifiedWithDependencies = new HashSet();
modifiedWithDependencies.addAll(modifieds);
List newDefinitions = new ArrayList();
boolean dirtySig = false;
for (TemplateClass tc : modifiedWithDependencies) {
if (tc.compile() == null) {
engine.classes().remove(tc);
currentState = new TemplateClassloaderState();//show others that we have changed..
} else {
int sigChecksum = tc.sigChecksum;
tc.enhance();
if (sigChecksum != tc.sigChecksum) {
dirtySig = true;
}
newDefinitions.add(new ClassDefinition(tc.javaClass, tc.enhancedByteCode));
currentState = new TemplateClassloaderState();//show others that we have changed..
}
}
if (newDefinitions.size() > 0) {
throw new ClassReloadException("Need Reload");
}
// Check signature (variable name & annotations aware !)
if (dirtySig) {
throw new ClassReloadException("Signature change !");
}
// Now check if there is new classCache or removed classCache
int hash = computePathHash();
if (hash != this.pathHash) {
// Remove class for deleted files !!
for (TemplateClass tc : engine.classes().all()) {
if (!tc.templateResource.isValid()) {
engine.classes().remove(tc);
currentState = new TemplateClassloaderState();//show others that we have changed..
}
}
throw new ClassReloadException("Path has changed");
}
}
/**
* Used to track change of the application sources path
*/
int pathHash = 0;
int computePathHash() {
return engine.isProdMode() ? 0 : classStateHashCreator.computePathHash(engine.conf().tmpDir());
}
}
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