org.apache.jasper.servlet.JspServletWrapper Maven / Gradle / Ivy
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package org.apache.jasper.servlet;
// START PWC 6468930
import java.io.File;
// END PWC 6468930
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URL;
import java.util.logging.Logger;
import java.util.logging.Level;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.SingleThreadModel;
import javax.servlet.UnavailableException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.tagext.TagInfo;
import org.glassfish.jsp.api.JspProbeEmitter;
import org.apache.jasper.JasperException;
import org.apache.jasper.JspCompilationContext;
import org.apache.jasper.Options;
import org.apache.jasper.compiler.JspRuntimeContext;
import org.apache.jasper.compiler.Localizer;
import org.apache.jasper.runtime.JspSourceDependent;
/**
* The JSP engine (a.k.a Jasper).
*
* The servlet container is responsible for providing a
* URLClassLoader for the web application context Jasper
* is being used in. Jasper will try get the Tomcat
* ServletContext attribute for its ServletContext class
* loader, if that fails, it uses the parent class loader.
* In either case, it must be a URLClassLoader.
*
* @author Anil K. Vijendran
* @author Harish Prabandham
* @author Remy Maucherat
* @author Kin-man Chung
* @author Glenn Nielsen
*/
public class JspServletWrapper {
// Logger
private static Logger log =
Logger.getLogger(JspServletWrapper.class.getName());
private Servlet theServlet;
private String jspUri;
private Class servletClass;
private Class tagHandlerClass;
private JspCompilationContext ctxt;
private long available = 0L;
private ServletConfig config;
private Options options;
private boolean firstTime = true;
private boolean reload = true;
private boolean isTagFile;
private int tripCount;
private JasperException compileException;
private JspProbeEmitter jspProbeEmitter;
/* PWC 6468930
private long servletClassLastModifiedTime;
*/
// START PWC 6468930
private long servletClassLastModifiedTime = 0L;
private File jspFile = null;
// END PWC 6468930
private long lastModificationTest = 0L;
/*
* JspServletWrapper for JSP pages.
*/
JspServletWrapper(ServletConfig config, Options options, String jspUri,
boolean isErrorPage, JspRuntimeContext rctxt)
throws JasperException {
this.isTagFile = false;
this.config = config;
this.options = options;
this.jspUri = jspUri;
this.jspProbeEmitter = (JspProbeEmitter)
config.getServletContext().getAttribute(
"org.glassfish.jsp.monitor.probeEmitter");
ctxt = new JspCompilationContext(jspUri, isErrorPage, options,
config.getServletContext(),
this, rctxt);
// START PWC 6468930
String jspFilePath = ctxt.getRealPath(jspUri);
if (jspFilePath != null) {
jspFile = new File(jspFilePath);
}
// END PWC 6468930
}
/*
* JspServletWrapper for tag files.
*/
public JspServletWrapper(ServletContext servletContext,
Options options,
String tagFilePath,
TagInfo tagInfo,
JspRuntimeContext rctxt,
URL tagFileJarUrl)
throws JasperException {
this.isTagFile = true;
this.config = null; // not used
this.options = options;
this.jspUri = tagFilePath;
this.tripCount = 0;
ctxt = new JspCompilationContext(jspUri, tagInfo, options,
servletContext, this, rctxt,
tagFileJarUrl);
}
public JspCompilationContext getJspEngineContext() {
return ctxt;
}
public void setReload(boolean reload) {
this.reload = reload;
}
public Servlet getServlet()
throws ServletException, IOException, ClassNotFoundException
{
if (reload) {
synchronized (this) {
// Synchronizing on jsw enables simultaneous loading
// of different pages, but not the same page.
if (reload) {
// This is to maintain the original protocol.
destroy();
try {
servletClass = ctxt.load();
theServlet = (Servlet) servletClass.newInstance();
} catch( IllegalAccessException ex1 ) {
throw new JasperException( ex1 );
} catch( InstantiationException ex ) {
throw new JasperException( ex );
}
theServlet.init(config);
if (!firstTime) {
ctxt.getRuntimeContext().incrementJspReloadCount();
// Fire the jspReloadedEvent probe event
if (jspProbeEmitter != null) {
jspProbeEmitter.jspReloadedEvent(jspUri);
}
}
reload = false;
// Fire the jspLoadedEvent probe event
if (jspProbeEmitter != null) {
jspProbeEmitter.jspLoadedEvent(jspUri);
}
}
}
}
return theServlet;
}
public ServletContext getServletContext() {
return config.getServletContext();
}
/**
* Sets the compilation exception for this JspServletWrapper.
*
* @param je The compilation exception
*/
public void setCompilationException(JasperException je) {
this.compileException = je;
}
/**
* Sets the last-modified time of the servlet class file associated with
* this JspServletWrapper.
*
* @param lastModified Last-modified time of servlet class
*/
public void setServletClassLastModifiedTime(long lastModified) {
if (this.servletClassLastModifiedTime < lastModified) {
synchronized (this) {
if (this.servletClassLastModifiedTime < lastModified) {
this.servletClassLastModifiedTime = lastModified;
reload = true;
}
}
}
}
// START CR 6373479
/**
* Gets the last-modified time of the servlet class file associated with
* this JspServletWrapper.
*
* @return Last-modified time of servlet class
*/
public long getServletClassLastModifiedTime() {
return servletClassLastModifiedTime;
}
// END CR 6373479
/**
* Compile (if needed) and load a tag file
*/
public Class loadTagFile() throws JasperException {
try {
ctxt.compile();
if (reload) {
tagHandlerClass = ctxt.load();
}
} catch (ClassNotFoundException ex) {
} catch (FileNotFoundException ex) {
log.log(Level.SEVERE, Localizer.getMessage("jsp.error.compiling"));
throw new JasperException(ex);
}
return tagHandlerClass;
}
/**
* Compile and load a prototype for the Tag file. This is needed
* when compiling tag files with circular dependencies. A prototpe
* (skeleton) with no dependencies on other other tag files is
* generated and compiled.
*/
public Class loadTagFilePrototype() throws JasperException {
ctxt.setPrototypeMode(true);
try {
return loadTagFile();
} finally {
ctxt.setPrototypeMode(false);
}
}
/**
* Get a list of files that the current page has source dependency on.
*/
public java.util.List getDependants() {
try {
Object target;
if (isTagFile) {
if (reload) {
tagHandlerClass = ctxt.load();
}
target = tagHandlerClass.newInstance();
} else {
target = getServlet();
}
if (target != null && target instanceof JspSourceDependent) {
return ((JspSourceDependent) target).getDependants();
}
} catch (Throwable ex) {
}
return null;
}
public boolean isTagFile() {
return this.isTagFile;
}
public int incTripCount() {
return tripCount++;
}
public int decTripCount() {
return tripCount--;
}
public void service(HttpServletRequest request,
HttpServletResponse response,
boolean precompile)
throws ServletException, IOException {
try {
if (ctxt.isRemoved()) {
jspFileNotFound(request, response);
return;
}
if ((available > 0L) && (available < Long.MAX_VALUE)) {
response.setDateHeader("Retry-After", available);
response.sendError
(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
Localizer.getMessage("jsp.error.unavailable"));
}
/*
* (1) Compile
*/
// BEGIN S1AS 6181923
// if (options.getDevelopment() || firstTime) {
// END S1AS 6181923
// BEGIN S1AS 6181923
if (!options.getUsePrecompiled()
&& (options.getDevelopment() || firstTime)) {
// END S1AS 6181923
synchronized (this) {
firstTime = false;
// The following sets reload to true, if necessary
ctxt.compile();
}
} else {
if (compileException != null) {
// Throw cached compilation exception
throw compileException;
}
}
/*
* (2) (Re)load servlet class file
*/
try {
getServlet();
} catch (ClassNotFoundException ex) {
// This can only happen when use-precomiled is set and a
// supposedly pre-compiled class does not exist.
jspFileNotFound(request, response);
return;
}
// If a page is to be precompiled only, return.
if (precompile) {
return;
}
/*
* (3) Service request
*/
if (theServlet instanceof SingleThreadModel) {
// sync on the wrapper so that the freshness
// of the page is determined right before servicing
synchronized (this) {
theServlet.service(request, response);
}
} else {
theServlet.service(request, response);
}
} catch (UnavailableException ex) {
String includeRequestUri = (String)
request.getAttribute("javax.servlet.include.request_uri");
if (includeRequestUri != null) {
// This file was included. Throw an exception as
// a response.sendError() will be ignored by the
// servlet engine.
throw ex;
} else {
int unavailableSeconds = ex.getUnavailableSeconds();
if (unavailableSeconds <= 0) {
unavailableSeconds = 60; // Arbitrary default
}
available = System.currentTimeMillis() +
(unavailableSeconds * 1000L);
response.sendError
(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
ex.getMessage());
}
} catch (ServletException ex) {
throw ex;
} catch (IOException ex) {
throw ex;
} catch (IllegalStateException ex) {
throw ex;
} catch (Exception ex) {
throw new JasperException(ex);
}
}
public void destroy() {
if (theServlet != null) {
theServlet.destroy();
// Fire the jspDestroyedEvent probe event
if (jspProbeEmitter != null) {
jspProbeEmitter.jspDestroyedEvent(jspUri);
}
}
}
/**
* @return Returns the lastModificationTest.
*/
public long getLastModificationTest() {
return lastModificationTest;
}
/**
* @param lastModificationTest The lastModificationTest to set.
*/
public void setLastModificationTest(long lastModificationTest) {
this.lastModificationTest = lastModificationTest;
}
// START PWC 6468930
public File getJspFile() {
return jspFile;
}
// END PWC 6468930
/*
* Handles the case where a requested JSP file no longer exists.
*/
private void jspFileNotFound(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
FileNotFoundException fnfe = new FileNotFoundException(jspUri);
ctxt.incrementRemoved();
String includeRequestUri = (String)
request.getAttribute("javax.servlet.include.request_uri");
if (includeRequestUri != null) {
// This file was included. Throw an exception as
// a response.sendError() will be ignored by the
// servlet engine.
throw new ServletException(fnfe);
} else {
try {
response.sendError(HttpServletResponse.SC_NOT_FOUND,
fnfe.getMessage());
} catch (IllegalStateException ise) {
log.log(Level.SEVERE,
Localizer.getMessage("jsp.error.file.not.found",
fnfe.getMessage()),
fnfe);
}
}
}
}
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