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Maven JSP precompilation plugin
/*
* 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 org.apache.jasper.compiler;
import java.io.*;
import java.util.*;
import org.apache.jasper.JasperException;
import org.apache.juli.logging.*;
import org.eclipse.jdt.core.compiler.IProblem;
import org.eclipse.jdt.internal.compiler.*;
import org.eclipse.jdt.internal.compiler.Compiler;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader;
import org.eclipse.jdt.internal.compiler.env.*;
import org.eclipse.jdt.internal.compiler.impl.CompilerOptions;
import org.eclipse.jdt.internal.compiler.problem.DefaultProblemFactory;
/**
* Based on {@link JDTCompiler}.
* Try to avoid some synchronization with this compiler when it use in parallel (with more than 4 threads)
*/
public class ParallelJDTCompiler extends org.apache.jasper.compiler.Compiler {
private final Log log = LogFactory.getLog(ParallelJDTCompiler.class); // must not be static
public boolean isCheckFileNecessary(char[] packageName) {
if (Character.isUpperCase(packageName[0])) {
return false;
}
String filename = String.valueOf(packageName);
return !filename.contains(".");
}
/**
* Compile the servlet from .java file to .class file
*/
@Override
protected void generateClass(Map smaps)
throws FileNotFoundException, JasperException, Exception {
long t1 = 0;
if (log.isDebugEnabled()) {
t1 = System.currentTimeMillis();
}
final String sourceFile = ctxt.getServletJavaFileName();
final String outputDir = ctxt.getOptions().getScratchDir().getAbsolutePath();
String packageName = ctxt.getServletPackageName();
final String targetClassName = ((packageName.length() != 0) ? (packageName + ".") : "")
+ ctxt.getServletClassName();
final ClassLoader classLoader = ctxt.getJspLoader();
String[] fileNames = new String[] { sourceFile };
String[] classNames = new String[] { targetClassName };
final List problemList = new ArrayList<>();
class CompilationUnit implements ICompilationUnit {
private final String className;
private final String sourceFile;
CompilationUnit(String sourceFile, String className) {
this.className = className;
this.sourceFile = sourceFile;
}
@Override
public char[] getFileName() {
return sourceFile.toCharArray();
}
@Override
public char[] getContents() {
char[] result = null;
try (FileInputStream is = new FileInputStream(sourceFile);
InputStreamReader isr = new InputStreamReader(is, ctxt.getOptions().getJavaEncoding());
Reader reader = new BufferedReader(isr)) {
char[] chars = new char[8192];
StringBuilder buf = new StringBuilder();
int count;
while ((count = reader.read(chars, 0, chars.length)) > 0) {
buf.append(chars, 0, count);
}
result = new char[buf.length()];
buf.getChars(0, result.length, result, 0);
} catch (IOException e) {
log.error("Compilation error", e);
}
return result;
}
@Override
public char[] getMainTypeName() {
int dot = className.lastIndexOf('.');
if (dot > 0) {
return className.substring(dot + 1).toCharArray();
}
return className.toCharArray();
}
@Override
public char[][] getPackageName() {
StringTokenizer izer = new StringTokenizer(className, ".");
char[][] result = new char[izer.countTokens() - 1][];
for (int i = 0; i < result.length; i++) {
String tok = izer.nextToken();
result[i] = tok.toCharArray();
}
return result;
}
@Override
public boolean ignoreOptionalProblems() {
return false;
}
}
final INameEnvironment env = new INameEnvironment() {
@Override
public NameEnvironmentAnswer findType(char[][] compoundTypeName) {
StringBuilder result = new StringBuilder();
for (int i = 0; i < compoundTypeName.length; i++) {
if (i > 0)
result.append('.');
result.append(compoundTypeName[i]);
}
return findType(result.toString());
}
@Override
public NameEnvironmentAnswer findType(char[] typeName, char[][] packageName) {
StringBuilder result = new StringBuilder();
int i = 0;
for (; i < packageName.length; i++) {
if (i > 0)
result.append('.');
result.append(packageName[i]);
}
if (i > 0)
result.append('.');
result.append(typeName);
return findType(result.toString());
}
private NameEnvironmentAnswer findType(String className) {
if (className.equals(targetClassName)) {
ICompilationUnit compilationUnit = new CompilationUnit(sourceFile, className);
return new NameEnvironmentAnswer(compilationUnit, null);
}
String resourceName = className.replace('.', '/') + ".class";
try (InputStream is = classLoader.getResourceAsStream(resourceName)) {
if (is != null) {
byte[] classBytes;
byte[] buf = new byte[8192];
ByteArrayOutputStream baos = new ByteArrayOutputStream(buf.length);
int count;
while ((count = is.read(buf, 0, buf.length)) > 0) {
baos.write(buf, 0, count);
}
baos.flush();
classBytes = baos.toByteArray();
char[] fileName = className.toCharArray();
ClassFileReader classFileReader = new ClassFileReader(classBytes, fileName, true);
return new NameEnvironmentAnswer(classFileReader, null);
}
} catch (IOException exc) {
log.error("Compilation error", exc);
} catch (org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException exc) {
log.error("Compilation error", exc);
}
return null;
}
private boolean isPackage(String result) {
if (result.equals(targetClassName)) {
return false;
}
String resourceName = result.replace('.', '/') + ".class";
try (InputStream is = classLoader.getResourceAsStream(resourceName)) {
return is == null;
} catch (IOException e) {
// we are here, since close on is failed. That means it was not null
return false;
}
}
@Override
public boolean isPackage(char[][] parentPackageName, char[] packageName) {
if (!isCheckFileNecessary(packageName)) {
return false;
}
StringBuilder result = new StringBuilder();
int i = 0;
if (parentPackageName != null) {
for (; i < parentPackageName.length; i++) {
if (i > 0)
result.append('.');
result.append(parentPackageName[i]);
}
}
if (Character.isUpperCase(packageName[0])) {
if (!isPackage(result.toString())) {
return false;
}
}
if (i > 0)
result.append('.');
result.append(packageName);
return isPackage(result.toString());
}
@Override
public void cleanup() {
}
};
final IErrorHandlingPolicy policy = DefaultErrorHandlingPolicies.proceedWithAllProblems();
final Map settings = new HashMap<>();
settings.put(CompilerOptions.OPTION_LineNumberAttribute, CompilerOptions.GENERATE);
settings.put(CompilerOptions.OPTION_SourceFileAttribute, CompilerOptions.GENERATE);
settings.put(CompilerOptions.OPTION_ReportDeprecation, CompilerOptions.IGNORE);
if (ctxt.getOptions().getJavaEncoding() != null) {
settings.put(CompilerOptions.OPTION_Encoding, ctxt.getOptions().getJavaEncoding());
}
if (ctxt.getOptions().getClassDebugInfo()) {
settings.put(CompilerOptions.OPTION_LocalVariableAttribute, CompilerOptions.GENERATE);
}
// Source JVM
if (ctxt.getOptions().getCompilerSourceVM() != null) {
String opt = ctxt.getOptions().getCompilerSourceVM();
if (opt.equals("1.1")) {
settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_1_1);
} else if (opt.equals("1.2")) {
settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_1_2);
} else if (opt.equals("1.3")) {
settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_1_3);
} else if (opt.equals("1.4")) {
settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_1_4);
} else if (opt.equals("1.5")) {
settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_1_5);
} else if (opt.equals("1.6")) {
settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_1_6);
} else if (opt.equals("1.7")) {
settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_1_7);
} else if (opt.equals("1.8")) {
settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_1_8);
// Version format changed from Java 9 onwards.
// Support old format that was used in EA implementation as well
} else if (opt.equals("9") || opt.equals("1.9")) {
settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_9);
} else if (opt.equals("10")) {
settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_10);
} else {
log.warn("Unknown source VM " + opt + " ignored.");
settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_1_8);
}
} else {
// Default to 1.8
settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_1_8);
}
// Target JVM
if (ctxt.getOptions().getCompilerTargetVM() != null) {
String opt = ctxt.getOptions().getCompilerTargetVM();
if (opt.equals("1.1")) {
settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_1_1);
} else if (opt.equals("1.2")) {
settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_1_2);
} else if (opt.equals("1.3")) {
settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_1_3);
} else if (opt.equals("1.4")) {
settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_1_4);
} else if (opt.equals("1.5")) {
settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_1_5);
settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_1_5);
} else if (opt.equals("1.6")) {
settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_1_6);
settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_1_6);
} else if (opt.equals("1.7")) {
settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_1_7);
settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_1_7);
} else if (opt.equals("1.8")) {
settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_1_8);
settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_1_8);
// Version format changed from Java 9 onwards.
// Support old format that was used in EA implementation as well
} else if (opt.equals("9") || opt.equals("1.9")) {
settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_9);
settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_9);
} else if (opt.equals("10")) {
settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_10);
settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_10);
} else {
log.warn("Unknown target VM " + opt + " ignored.");
settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_1_8);
}
} else {
// Default to 1.8
settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_1_8);
settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_1_8);
}
final IProblemFactory problemFactory = new DefaultProblemFactory(Locale.getDefault());
final ICompilerRequestor requestor = new ICompilerRequestor() {
@Override
public void acceptResult(CompilationResult result) {
try {
if (result.hasProblems()) {
IProblem[] problems = result.getProblems();
for (int i = 0; i < problems.length; i++) {
IProblem problem = problems[i];
if (problem.isError()) {
String name = new String(problems[i].getOriginatingFileName());
try {
problemList.add(ErrorDispatcher.createJavacError(name, pageNodes,
new StringBuilder(problem.getMessage()), problem.getSourceLineNumber(),
ctxt));
} catch (JasperException e) {
log.error("Error visiting node", e);
}
}
}
}
if (problemList.isEmpty()) {
ClassFile[] classFiles = result.getClassFiles();
for (int i = 0; i < classFiles.length; i++) {
ClassFile classFile = classFiles[i];
char[][] compoundName = classFile.getCompoundName();
StringBuilder classFileName = new StringBuilder(outputDir).append('/');
for (int j = 0; j < compoundName.length; j++) {
if (j > 0)
classFileName.append('/');
classFileName.append(compoundName[j]);
}
byte[] bytes = classFile.getBytes();
classFileName.append(".class");
try (FileOutputStream fout = new FileOutputStream(classFileName.toString());
BufferedOutputStream bos = new BufferedOutputStream(fout)) {
bos.write(bytes);
}
}
}
} catch (IOException exc) {
log.error("Compilation error", exc);
}
}
};
ICompilationUnit[] compilationUnits = new ICompilationUnit[classNames.length];
for (int i = 0; i < compilationUnits.length; i++) {
String className = classNames[i];
compilationUnits[i] = new CompilationUnit(fileNames[i], className);
}
CompilerOptions cOptions = new CompilerOptions(settings);
cOptions.parseLiteralExpressionsAsConstants = true;
Compiler compiler = new Compiler(env, policy, cOptions, requestor, problemFactory);
compiler.compile(compilationUnits);
if (!ctxt.keepGenerated()) {
File javaFile = new File(ctxt.getServletJavaFileName());
if (!javaFile.delete()) {
throw new JasperException(Localizer.getMessage("jsp.warning.compiler.javafile.delete.fail", javaFile));
}
}
if (!problemList.isEmpty()) {
JavacErrorDetail[] jeds = problemList.toArray(new JavacErrorDetail[0]);
errDispatcher.javacError(jeds);
}
if (log.isDebugEnabled()) {
long t2 = System.currentTimeMillis();
log.debug("Compiled " + ctxt.getServletJavaFileName() + " " + (t2 - t1) + "ms");
}
if (ctxt.isPrototypeMode()) {
return;
}
// JSR45 Support
if (!options.isSmapSuppressed()) {
SmapUtil.installSmap(smaps);
}
}
}
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