/*
* 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.runtime;
import java.security.AccessController;
import java.security.PrivilegedAction;
import javax.servlet.Servlet;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.jsp.JspApplicationContext;
import javax.servlet.jsp.JspEngineInfo;
import javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.PageContext;
import org.apache.jasper.Constants;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
/**
* Implementation of JspFactory.
*
* @author Anil K. Vijendran
*/
public class JspFactoryImpl extends JspFactory {
// Logger
private Log log = LogFactory.getLog(JspFactoryImpl.class);
private static final String SPEC_VERSION = "2.1";
private static final boolean USE_POOL =
Boolean.valueOf(System.getProperty("org.apache.jasper.runtime.JspFactoryImpl.USE_POOL", "true")).booleanValue();
private static final int POOL_SIZE =
Integer.valueOf(System.getProperty("org.apache.jasper.runtime.JspFactoryImpl.POOL_SIZE", "8")).intValue();
private ThreadLocal<PageContextPool> localPool = new ThreadLocal<PageContextPool>();
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(
(JspFactoryImpl)this, servlet, request, response, errorPageURL,
needsSession, bufferSize, autoflush);
return (PageContext)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(
(JspFactoryImpl)this,pc);
AccessController.doPrivileged(dp);
} else {
internalReleasePageContext(pc);
}
}
public JspEngineInfo getEngineInfo() {
return new JspEngineInfo() {
public String getSpecificationVersion() {
return SPEC_VERSION;
}
};
}
private PageContext internalGetPageContext(Servlet servlet, ServletRequest request,
ServletResponse response, String errorPageURL, boolean needsSession,
int bufferSize, boolean autoflush) {
try {
PageContext pc;
if (USE_POOL) {
PageContextPool pool = localPool.get();
if (pool == null) {
pool = new PageContextPool();
localPool.set(pool);
}
pc = pool.get();
if (pc == null) {
pc = new PageContextImpl();
}
} else {
pc = new PageContextImpl();
}
pc.initialize(servlet, request, response, errorPageURL,
needsSession, bufferSize, autoflush);
return pc;
} catch (Throwable ex) {
/* FIXME: need to do something reasonable here!! */
log.fatal("Exception initializing page context", ex);
return null;
}
}
private void internalReleasePageContext(PageContext pc) {
pc.release();
if (USE_POOL && (pc instanceof PageContextImpl)) {
localPool.get().put(pc);
}
}
private class PrivilegedGetPageContext implements PrivilegedAction {
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 Object run() {
return factory.internalGetPageContext(servlet, request, response,
errorPageURL, needsSession, bufferSize, autoflush);
}
}
private class PrivilegedReleasePageContext implements PrivilegedAction {
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;
}
}
protected final class PageContextPool {
private PageContext[] pool;
private int current = -1;
public PageContextPool() {
this.pool = new PageContext[POOL_SIZE];
}
public void put(PageContext o) {
if (current < (POOL_SIZE - 1)) {
current++;
pool[current] = o;
}
}
public PageContext get() {
PageContext item = null;
if (current >= 0) {
item = pool[current];
current--;
}
return item;
}
}
public JspApplicationContext getJspApplicationContext(
final ServletContext context) {
if (Constants.IS_SECURITY_ENABLED) {
return AccessController.doPrivileged(
new PrivilegedAction<JspApplicationContext>() {
public JspApplicationContext run() {
return JspApplicationContextImpl.getInstance(context);
}
});
} else {
return JspApplicationContextImpl.getInstance(context);
}
}
}