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Posted to dev@tomcat.apache.org by co...@apache.org on 2003/01/24 20:28:10 UTC
cvs commit: jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/startup TldConfig.java
costin 2003/01/24 11:28:10
Added: catalina/src/share/org/apache/catalina/startup
TldConfig.java
Log:
Refactored the tld listener configuration out of ContextConfig.
Cache the listeners in work/.../tldCache.ser ( as a String[] ). If the
file exists and is newer than all .jar and .tld - we'll not rescan/re-parse
those.
This needs to be called from Context ( right before START event ), and removed
from ContextConfig.
Revision Changes Path
1.1 jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/startup/TldConfig.java
Index: TldConfig.java
===================================================================
/*
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* The Apache Software License, Version 1.1
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* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
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* distribution.
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package org.apache.catalina.startup;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.JarURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import javax.naming.NameClassPair;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.DirContext;
import javax.servlet.ServletException;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.catalina.Context;
import org.apache.catalina.Globals;
import org.apache.catalina.core.StandardContext;
import org.apache.catalina.util.SchemaResolver;
import org.apache.catalina.util.StringManager;
import org.apache.commons.digester.Digester;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
/**
* Startup event listener for a <b>Context</b> that configures the properties
* of that Context, and the associated defined servlets.
*
* @author Craig R. McClanahan
* @author Jean-Francois Arcand
* @author Costin Manolache
*/
public final class TldConfig {
private static org.apache.commons.logging.Log log=
org.apache.commons.logging.LogFactory.getLog( TldConfig.class );
// ----------------------------------------------------- Instance Variables
/**
* The Context we are associated with.
*/
private Context context = null;
/**
* The string resources for this package.
*/
private static final StringManager sm =
StringManager.getManager(Constants.Package);
/**
* The <code>Digester</code> we will use to process tag library
* descriptor files.
*/
private static Digester tldDigester = null;
/**
* Attribute value used to turn on/off XML validation
*/
private static boolean xmlValidation = false;
/**
* Attribute value used to turn on/off XML namespace awarenes.
*/
private static boolean xmlNamespaceAware = false;
private boolean rescan=true;
private ArrayList listeners=new ArrayList();
// --------------------------------------------------------- Public Methods
public boolean isRescan() {
return rescan;
}
public void setRescan(boolean rescan) {
this.rescan = rescan;
}
public Context getContext() {
return context;
}
public void setContext(Context context) {
this.context = context;
}
public void addApplicationListener( String s ) {
//if(log.isDebugEnabled())
log.info( "Add tld listener " + s);
listeners.add(s);
}
public String[] getTldListeners() {
String result[]=new String[listeners.size()];
listeners.toArray(result);
return result;
}
/**
* Scan for and configure all tag library descriptors found in this
* web application.
*
* @exception Exception if a fatal input/output or parsing error occurs
*/
public void execute() throws Exception {
long t1=System.currentTimeMillis();
File tldCache=null;
if( context instanceof StandardContext ) {
File workDir=(File)
((StandardContext)context).getServletContext().getAttribute(Globals.WORK_DIR_ATTR);
tldCache=new File( workDir, "tldCache.ser");
}
// Option to not rescan
if( ! rescan ) {
// find the cache
if( tldCache!= null && tldCache.exists()) {
// just read it...
processCache(tldCache);
return;
}
}
// Acquire this list of TLD resource paths to be processed
Set resourcePaths = tldScanResourcePaths();
if( tldCache!= null && tldCache.exists()) {
// Find last modified
Iterator paths = resourcePaths.iterator();
long lastModified=0;
while (paths.hasNext()) {
String path = (String) paths.next();
URL url = context.getServletContext().getResource(path);
if( url==null ) {
log.info( "Null url "+ path );
break;
}
long lastM=url.openConnection().getLastModified();
if( lastM > lastModified ) lastModified=lastM;
if( log.isDebugEnabled() )
log.debug( "Last modified " + path + " " + lastM);
}
if( lastModified < tldCache.lastModified()) {
processCache(tldCache);
return;
}
}
// Scan each accumulated resource paths for TLDs to be processed
Iterator paths = resourcePaths.iterator();
while (paths.hasNext()) {
String path = (String) paths.next();
if (path.endsWith(".jar")) {
tldScanJar(path);
} else {
tldScanTld(path);
}
}
String list[]=getTldListeners();
if( tldCache!= null ) {
log.info( "Saving tld cache: " + tldCache + " " + list.length);
try {
FileOutputStream out=new FileOutputStream(tldCache);
ObjectOutputStream oos=new ObjectOutputStream( out );
oos.writeObject( list );
oos.close();
} catch( IOException ex ) {
ex.printStackTrace();
}
}
if( log.isDebugEnabled() )
log.debug( "Adding tld listeners:" + list.length);
for( int i=0; list!=null && i<list.length; i++ ) {
context.addApplicationListener(list[i]);
}
long t2=System.currentTimeMillis();
if( context instanceof StandardContext ) {
((StandardContext)context).setTldScanTime(t2-t1);
}
}
// -------------------------------------------------------- Private Methods
private void processCache(File tldCache ) throws IOException {
// read the cache and return;
try {
FileInputStream in=new FileInputStream(tldCache);
ObjectInputStream ois=new ObjectInputStream( in );
String list[]=(String [])ois.readObject();
log.info("Reusing tldCache " + tldCache + " " + list.length);
for( int i=0; list!=null && i<list.length; i++ ) {
context.addApplicationListener(list[i]);
}
ois.close();
} catch( ClassNotFoundException ex ) {
ex.printStackTrace();
}
}
/**
* Create (if necessary) and return a Digester configured to process a tag
* library descriptor, looking for additional listener classes to be
* registered.
*/
private static Digester createTldDigester() {
URL url = null;
Digester tldDigester = new Digester();
tldDigester.setNamespaceAware(xmlNamespaceAware);
tldDigester.setValidating(xmlValidation);
if (tldDigester.getFactory().getClass().getName().indexOf("xerces")!=-1) {
tldDigester = patchXerces(tldDigester);
}
// Set the schemaLocation
url = TldConfig.class.getResource(Constants.TldSchemaResourcePath_20);
SchemaResolver tldEntityResolver = new SchemaResolver(url.toString(),
tldDigester);
if( xmlValidation ) {
tldDigester.setSchema(url.toString());
}
url = TldConfig.class.getResource(Constants.TldDtdResourcePath_11);
tldEntityResolver.register(Constants.TldDtdPublicId_11,
url.toString());
url = TldConfig.class.getResource(Constants.TldDtdResourcePath_12);
tldEntityResolver.register(Constants.TldDtdPublicId_12,
url.toString());
tldEntityResolver = registerLocalSchema(tldEntityResolver);
tldDigester.setEntityResolver(tldEntityResolver);
tldDigester.addRuleSet(new TldRuleSet());
return (tldDigester);
}
private static Digester patchXerces(Digester digester){
// This feature is needed for backward compatibility with old DDs
// which used Java encoding names such as ISO8859_1 etc.
// with Crimson (bug 4701993). By default, Xerces does not
// support ISO8859_1.
try{
digester.setFeature(
"http://apache.org/xml/features/allow-java-encodings", true);
} catch(ParserConfigurationException e){
// log("contextConfig.registerLocalSchema", e);
} catch(SAXNotRecognizedException e){
// log("contextConfig.registerLocalSchema", e);
} catch(SAXNotSupportedException e){
// log("contextConfig.registerLocalSchema", e);
}
return digester;
}
/**
* Utilities used to force the parser to use local schema, when available,
* instead of the <code>schemaLocation</code> XML element.
* @param entityResolver The instance on which properties are set.
* @return an instance ready to parse XML schema.
*/
protected static SchemaResolver registerLocalSchema(SchemaResolver entityResolver){
URL url = TldConfig.class.getResource(Constants.J2eeSchemaResourcePath_14);
entityResolver.register(Constants.J2eeSchemaPublicId_14,
url.toString());
url = TldConfig.class.getResource(Constants.W3cSchemaResourcePath_10);
entityResolver.register(Constants.W3cSchemaPublicId_10,
url.toString());
url = TldConfig.class.getResource(Constants.JspSchemaResourcePath_20);
entityResolver.register(Constants.JspSchemaPublicId_20,
url.toString());
url = TldConfig.class.getResource(Constants.TldSchemaResourcePath_20);
entityResolver.register(Constants.TldSchemaPublicId_20,
url.toString());
url = TldConfig.class.getResource(Constants.WebSchemaResourcePath_24);
entityResolver.register(Constants.WebSchemaPublicId_24,
url.toString());
url = TldConfig.class.getResource(Constants.J2eeWebServiceSchemaResourcePath_11);
entityResolver.register(Constants.J2eeWebServiceSchemaPublicId_11,
url.toString());
url = TldConfig.class.getResource(Constants.J2eeWebServiceClientSchemaResourcePath_11);
entityResolver.register(Constants.J2eeWebServiceClientSchemaPublicId_11,
url.toString());
return entityResolver;
}
/**
* Scan the JAR file at the specified resource path for TLDs in the
* <code>META-INF</code> subdirectory, and scan them for application
* event listeners that need to be registered.
*
* @param resourcePath Resource path of the JAR file to scan
*
* @exception Exception if an exception occurs while scanning this JAR
*/
private void tldScanJar(String resourcePath) throws Exception {
if (log.isDebugEnabled()) {
log.debug(" Scanning JAR at resource path '" + resourcePath + "'");
}
JarFile jarFile = null;
String name = null;
InputStream inputStream = null;
try {
URL url = context.getServletContext().getResource(resourcePath);
if (url == null) {
throw new IllegalArgumentException
(sm.getString("contextConfig.tldResourcePath",
resourcePath));
}
url = new URL("jar:" + url.toString() + "!/");
JarURLConnection conn =
(JarURLConnection) url.openConnection();
conn.setUseCaches(false);
jarFile = conn.getJarFile();
Enumeration entries = jarFile.entries();
while (entries.hasMoreElements()) {
JarEntry entry = (JarEntry) entries.nextElement();
name = entry.getName();
if (!name.startsWith("META-INF/")) {
continue;
}
if (!name.endsWith(".tld")) {
continue;
}
if (log.isTraceEnabled()) {
log.trace(" Processing TLD at '" + name + "'");
}
inputStream = jarFile.getInputStream(entry);
tldScanStream(inputStream);
inputStream.close();
inputStream = null;
name = null;
}
// FIXME - Closing the JAR file messes up the class loader???
// jarFile.close();
} catch (Exception e) {
// XXX Why do we wrap it ? The signature is 'throws Exception'
if (name == null) {
log.error(sm.getString("contextConfig.tldJarException",
resourcePath, context.getPath()), e);
} else {
log.error(sm.getString("contextConfig.tldEntryException",
name, resourcePath, context.getPath()), e);
}
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (Throwable t) {
;
}
inputStream = null;
}
if (jarFile != null) {
// FIXME - Closing the JAR file messes up the class loader???
// try {
// jarFile.close();
// } catch (Throwable t) {
// ;
// }
jarFile = null;
}
}
}
/**
* Scan the TLD contents in the specified input stream, and register
* any application event listeners found there. <b>NOTE</b> - It is
* the responsibility of the caller to close the InputStream after this
* method returns.
*
* @param resourceStream InputStream containing a tag library descriptor
*
* @exception Exception if an exception occurs while scanning this TLD
*/
private void tldScanStream(InputStream resourceStream)
throws Exception {
if (tldDigester == null){
tldDigester = createTldDigester();
}
synchronized (tldDigester) {
tldDigester.clear();
tldDigester.push(this);
tldDigester.parse(resourceStream);
}
}
/**
* Scan the TLD contents at the specified resource path, and register
* any application event listeners found there.
*
* @param resourcePath Resource path being scanned
*
* @exception Exception if an exception occurs while scanning this TLD
*/
private void tldScanTld(String resourcePath) throws Exception {
if (log.isDebugEnabled()) {
log.debug(" Scanning TLD at resource path '" + resourcePath + "'");
}
InputStream inputStream = null;
try {
inputStream =
context.getServletContext().getResourceAsStream(resourcePath);
if (inputStream == null) {
throw new IllegalArgumentException
(sm.getString("contextConfig.tldResourcePath",
resourcePath));
}
tldScanStream(inputStream);
inputStream.close();
inputStream = null;
} catch (Exception e) {
throw new ServletException
(sm.getString("contextConfig.tldFileException", resourcePath, context.getPath()),
e);
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (Throwable t) {
;
}
inputStream = null;
}
}
}
/**
* Accumulate and return a Set of resource paths to be analyzed for
* tag library descriptors. Each element of the returned set will be
* the context-relative path to either a tag library descriptor file,
* or to a JAR file that may contain tag library descriptors in its
* <code>META-INF</code> subdirectory.
*
* @exception IOException if an input/output error occurs while
* accumulating the list of resource paths
*/
private Set tldScanResourcePaths() throws IOException {
if (log.isDebugEnabled()) {
log.debug(" Accumulating TLD resource paths");
}
Set resourcePaths = new HashSet();
// Accumulate resource paths explicitly listed in the web application
// deployment descriptor
if (log.isTraceEnabled()) {
log.trace(" Scanning <taglib> elements in web.xml");
}
String taglibs[] = context.findTaglibs();
for (int i = 0; i < taglibs.length; i++) {
String resourcePath = context.findTaglib(taglibs[i]);
// FIXME - Servlet 2.4 DTD implies that the location MUST be
// a context-relative path starting with '/'?
if (!resourcePath.startsWith("/")) {
resourcePath = "/WEB-INF/" + resourcePath;
}
if (log.isTraceEnabled()) {
log.trace(" Adding path '" + resourcePath +
"' for URI '" + taglibs[i] + "'");
}
resourcePaths.add(resourcePath);
}
// Scan TLDs in the /WEB-INF subdirectory of the web application
if (log.isTraceEnabled()) {
log.trace(" Scanning TLDs in /WEB-INF subdirectory");
}
DirContext resources = context.getResources();
if( resources!=null ) {
try {
NamingEnumeration items = resources.list("/WEB-INF");
while (items.hasMoreElements()) {
NameClassPair item = (NameClassPair) items.nextElement();
String resourcePath = "/WEB-INF/" + item.getName();
// FIXME - JSP 2.0 is not explicit about whether we should
// scan subdirectories of /WEB-INF for TLDs also
if (!resourcePath.endsWith(".tld")) {
continue;
}
if (log.isTraceEnabled()) {
log.trace(" Adding path '" + resourcePath + "'");
}
resourcePaths.add(resourcePath);
}
} catch (NamingException e) {
; // Silent catch: it's valid that no /WEB-INF directory exists
}
} else {
log.info("No resource " + context + " " + context.getClass());
}
// Scan JARs in the /WEB-INF/lib subdirectory of the web application
if (log.isTraceEnabled()) {
log.trace(" Scanning JARs in /WEB-INF/lib subdirectory");
}
try {
NamingEnumeration items = resources.list("/WEB-INF/lib");
while (items.hasMoreElements()) {
NameClassPair item = (NameClassPair) items.nextElement();
String resourcePath = "/WEB-INF/lib/" + item.getName();
if (!resourcePath.endsWith(".jar")) {
continue;
}
if (log.isTraceEnabled()) {
log.trace(" Adding path '" + resourcePath + "'");
}
resourcePaths.add(resourcePath);
}
} catch (NamingException e) {
; // Silent catch: it's valid that no /WEB-INF/lib directory exists
}
// Return the completed set
return (resourcePaths);
}
}
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