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* Copyright 2004 The Apache Software Foundation
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package org.apache.jasper.compiler;
import java.io.File;
import java.io.IOException;
import java.io.FileOutputStream;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ThreadFactory;
import java.util.logging.Logger;
import java.util.logging.Level;
import org.apache.jasper.JasperException;
import org.apache.jasper.JspCompilationContext;
import org.apache.jasper.Options;
import org.apache.jasper.util.SystemLogHandler;
import org.apache.jasper.Constants;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DefaultLogger;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.Javac;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.types.PatternSet;
/**
* Java compiler through ant
*
* @author Kin-man Chung
*/
public class AntJavaCompiler implements JavaCompiler {
private JasperAntLogger logger;
private Javac javac;
private Project project=null;
private JspCompilationContext ctxt;
private Options options;
private ErrorDispatcher errDispatcher;
private String javaFileName;
private String javaEncoding;
private StringBuilder info = new StringBuilder();
// For collecting Java compilation enviroment
private Logger log;
// Use a threadpool and force it to 1 to simulate serialization
private static ExecutorService threadPool = null;
private static ThreadFactory threadFactory = new JavacThreadFactory();
private static final String JAVAC_THREAD_PREFIX = "javac-";
private static String lineSeparator = System.getProperty("line.separator");
private Project getProject() {
if( project!=null ) return project;
// Initializing project
project = new Project();
logger = new JasperAntLogger();
logger.setOutputPrintStream(System.out);
logger.setErrorPrintStream(System.err);
logger.setMessageOutputLevel(Project.MSG_INFO);
project.addBuildListener( logger);
if (System.getProperty("catalina.home") != null) {
project.setBasedir( System.getProperty("catalina.home"));
}
if( options.getCompiler() != null ) {
if( log.isLoggable(Level.FINE))
log.fine("Compiler " + options.getCompiler() );
project.setProperty("build.compiler", options.getCompiler() );
}
project.init();
return project;
}
class JasperAntLogger extends DefaultLogger {
private StringBuilder reportBuf = new StringBuilder();
protected void printMessage(final String message,
final PrintStream stream,
final int priority) {
}
protected void log(String message) {
reportBuf.append(message);
reportBuf.append(lineSeparator);
}
protected String getReport() {
String report = reportBuf.toString();
reportBuf.setLength(0);
return report;
}
}
public void init(JspCompilationContext ctxt,
ErrorDispatcher errDispatcher,
boolean suppressLogging) {
this.ctxt = ctxt;
this.errDispatcher = errDispatcher;
options = ctxt.getOptions();
log = Logger.getLogger(AntJavaCompiler.class.getName());
if (suppressLogging) {
log.setLevel(Level.OFF);
}
getProject();
javac = (Javac) project.createTask("javac");
javac.setFork(options.getFork());
// Set the Java compiler to use
if (options.getCompiler() != null) {
javac.setCompiler(options.getCompiler());
}
startThreadPool();
}
public void release() {
}
public void setExtdirs(String exts) {
Path extdirs = new Path(project);
extdirs.setPath(exts);
javac.setExtdirs(extdirs);
info.append(" extdirs=" + exts+ "\n");
}
public void setTargetVM(String targetVM) {
javac.setTarget(targetVM);
info.append(" compilerTargetVM=" + targetVM + "\n");
}
public void setSourceVM(String sourceVM) {
javac.setSource(sourceVM);
info.append(" compilerSourceVM=" + sourceVM + "\n");
}
public void setClassPath(List cpath) {
Path path = new Path(project);
for (File file: cpath) {
path.setLocation(file);
info.append(" cp=" + file + "\n");
}
javac.setClasspath(path);
}
public void saveClassFile(String className, String classFileName) {
// class files are alwyas saved.
}
public void setDebug(boolean debug) {
javac.setDebug(debug);
javac.setOptimize(!debug);
}
public long getClassLastModified() {
File classFile = new File(ctxt.getClassFileName());
return classFile.lastModified();
}
public Writer getJavaWriter(String javaFileName,
String javaEncoding)
throws JasperException {
this.javaFileName = javaFileName;
info.append("Compile: javaFileName=" + javaFileName + "\n" );
this.javaEncoding = javaEncoding;
Writer writer = null;
try {
writer = new OutputStreamWriter(
new FileOutputStream(javaFileName), javaEncoding);
} catch (UnsupportedEncodingException ex) {
errDispatcher.jspError("jsp.error.needAlternateJavaEncoding",
javaEncoding);
} catch (IOException ex) {
errDispatcher.jspError("jsp.error.unableToCreateOutputWriter",
javaFileName, ex);
}
return writer;
}
public JavacErrorDetail[] compile(String className, Node.Nodes pageNodes)
throws JasperException {
// Start capturing the System.err output for this thread
SystemLogHandler.setThread();
javac.setEncoding(javaEncoding);
// Initialize sourcepath
Path srcPath = new Path(project);
srcPath.setLocation(options.getScratchDir());
javac.setSrcdir(srcPath);
info.append(" srcDir=" + srcPath + "\n" );
info.append(" work dir=" + options.getScratchDir() + "\n");
// Build includes path
PatternSet.NameEntry includes = javac.createInclude();
includes.setName(ctxt.getJavaPath());
info.append(" include="+ ctxt.getJavaPath() + "\n" );
BuildException be = null;
StringBuilder errorReport = new StringBuilder();
String errorCapture = null;
if (ctxt.getOptions().getFork()) {
try {
javac.execute();
} catch (BuildException e) {
be = e;
log.log(Level.SEVERE, Localizer
.getMessage("jsp.error.javac.exception"), e);
log.log(Level.SEVERE, Localizer
.getMessage("jsp.error.javac.env", info.toString()));
}
errorReport.append(logger.getReport());
// Stop capturing the System.err output for this thread
errorCapture = SystemLogHandler.unsetThread();
} else {
errorReport.append(logger.getReport());
errorCapture = SystemLogHandler.unsetThread();
// Capture the current thread
if (errorCapture != null) {
errorReport.append(lineSeparator);
errorReport.append(errorCapture);
}
JavacObj javacObj = new JavacObj(javac);
synchronized(javacObj) {
threadPool.execute(javacObj);
// Wait for the thread to complete
try {
javacObj.wait();
} catch (InterruptedException e) {
;
}
}
be = javacObj.getException();
if (be != null) {
log.log(Level.SEVERE, Localizer
.getMessage("jsp.error.javac.exception"), be);
log.log(Level.SEVERE, Localizer
.getMessage("jsp.error.javac.env", info.toString()));
}
errorReport.append(logger.getReport());
errorCapture = javacObj.getErrorCapture();
}
if (errorCapture != null) {
errorReport.append(lineSeparator);
errorReport.append(errorCapture);
}
JavacErrorDetail[] javacErrors = null;
if (be != null) {
try {
String errorReportString = errorReport.toString();
javacErrors = ErrorDispatcher.parseJavacMessage(
pageNodes, errorReportString, javaFileName);
} catch (IOException ex) {
throw new JasperException(ex);
}
}
return javacErrors;
}
public void doJavaFile(boolean keep) {
if (!keep) {
File javaFile = new File(javaFileName);
javaFile.delete();
}
}
public static void startThreadPool() {
if (threadPool == null) {
threadPool = Executors.newCachedThreadPool(threadFactory);
}
}
public static void shutdownThreadPool() {
if (threadPool != null) {
threadPool.shutdown();
}
}
// Implement java compilation in a separate java thread to
// avoid stack overflow problem (exposed by 64 -bit server)
private static class JavacObj implements Runnable {
Javac _javac = null;
BuildException _be = null;
String _errorCapture = null;
public JavacObj(Javac javac) {
_javac = javac;
}
public void run() {
SystemLogHandler.setThread();
try {
_javac.execute();
} catch (BuildException e) {
_be = e;
} finally {
_errorCapture = SystemLogHandler.unsetThread();
synchronized(this) {
this.notify();
}
}
}
public BuildException getException() {
return _be;
}
public String getErrorCapture() {
return _errorCapture;
}
}
private static class JavacThreadFactory implements ThreadFactory {
private ThreadFactory defaultFactory = Executors.defaultThreadFactory();
public Thread newThread(Runnable r) {
Thread t = defaultFactory.newThread(r);
t.setName(JAVAC_THREAD_PREFIX + t.getName());
return t;
}
}
}
