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package org.apache.jasper.runtime;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.LinkedList;
import java.util.logging.Logger;
import java.util.logging.Level;
import javax.servlet.Servlet;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.ServletContext;
import javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.JspEngineInfo;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.JspApplicationContext;
import org.apache.jasper.Constants;
/**
* Implementation of JspFactory.
*
* @author Anil K. Vijendran
* @author Kin-man Chung
*/
public class JspFactoryImpl extends JspFactory {
// Logger
private static Logger log =
Logger.getLogger(JspFactoryImpl.class.getName());
private static final String SPEC_VERSION = "2.1";
// Pooling PageContextImpl intances are known to leak memories, see
// https://glassfish.dev.java.net/issues/show_bug.cgi?id=8601
// So pooling is off by default. If for any reason, backwards
// compatibility is required, set the system property to true.
private static final boolean USE_POOL =
Boolean.getBoolean(
"org.apache.jasper.runtime.JspFactoryImpl.USE_POOL");
// Per-thread pool of PageContext objects
private ThreadLocal<LinkedList<PageContext>> pool =
new ThreadLocal<LinkedList<PageContext>>() {
protected synchronized LinkedList<PageContext> initialValue() {
return new LinkedList<PageContext>();
}
};
public PageContext getPageContext(Servlet servlet,
ServletRequest request,
ServletResponse response,
String errorPageURL,
boolean needsSession,
int bufferSize,
boolean autoflush) {
if (Constants.IS_SECURITY_ENABLED) {
PrivilegedGetPageContext dp =
new PrivilegedGetPageContext(
this, servlet, request, response, errorPageURL,
needsSession, bufferSize, autoflush);
return AccessController.doPrivileged(dp);
} else {
return internalGetPageContext(servlet, request, response,
errorPageURL, needsSession,
bufferSize, autoflush);
}
}
public void releasePageContext(PageContext pc) {
if( pc == null )
return;
if (Constants.IS_SECURITY_ENABLED) {
PrivilegedReleasePageContext dp =
new PrivilegedReleasePageContext(this, pc);
AccessController.doPrivileged(dp);
} else {
internalReleasePageContext(pc);
}
}
public JspEngineInfo getEngineInfo() {
return new JspEngineInfo() {
public String getSpecificationVersion() {
return SPEC_VERSION;
}
};
}
public JspApplicationContext getJspApplicationContext
(ServletContext context) {
return JspApplicationContextImpl.findJspApplicationContext(context);
}
private PageContext internalGetPageContext(Servlet servlet,
ServletRequest request,
ServletResponse response,
String errorPageURL,
boolean needsSession,
int bufferSize,
boolean autoflush) {
try {
PageContext pc = null;
if( USE_POOL ) {
LinkedList<PageContext> pcPool = pool.get();
if (!pcPool.isEmpty()) {
pc = pcPool.removeFirst();
}
if (pc == null) {
pc = new PageContextImpl(this);
}
} else {
pc = new PageContextImpl(this);
}
pc.initialize(servlet, request, response, errorPageURL,
needsSession, bufferSize, autoflush);
return pc;
} catch (Throwable ex) {
/* FIXME: need to do something reasonable here!! */
log.log(Level.SEVERE, "Exception initializing page context", ex);
return null;
}
}
private void internalReleasePageContext(PageContext pc) {
pc.release();
if (USE_POOL && (pc instanceof PageContextImpl)) {
LinkedList<PageContext> pcPool = pool.get();
pcPool.addFirst(pc);
}
}
private class PrivilegedGetPageContext
implements PrivilegedAction<PageContext> {
private JspFactoryImpl factory;
private Servlet servlet;
private ServletRequest request;
private ServletResponse response;
private String errorPageURL;
private boolean needsSession;
private int bufferSize;
private boolean autoflush;
PrivilegedGetPageContext(JspFactoryImpl factory,
Servlet servlet,
ServletRequest request,
ServletResponse response,
String errorPageURL,
boolean needsSession,
int bufferSize,
boolean autoflush) {
this.factory = factory;
this.servlet = servlet;
this.request = request;
this.response = response;
this.errorPageURL = errorPageURL;
this.needsSession = needsSession;
this.bufferSize = bufferSize;
this.autoflush = autoflush;
}
public PageContext run() {
return factory.internalGetPageContext(servlet,
request,
response,
errorPageURL,
needsSession,
bufferSize,
autoflush);
}
}
private class PrivilegedReleasePageContext
implements PrivilegedAction<Object> {
private JspFactoryImpl factory;
private PageContext pageContext;
PrivilegedReleasePageContext(JspFactoryImpl factory,
PageContext pageContext) {
this.factory = factory;
this.pageContext = pageContext;
}
public Object run() {
factory.internalReleasePageContext(pageContext);
return null;
}
}
}