| /* |
| * 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.io.IOException; |
| 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; |
| |
| /** |
| * Implementation of JspFactory. |
| * |
| * @author Anil K. Vijendran |
| */ |
| public class JspFactoryImpl extends JspFactory { |
| |
| private static final String SPEC_VERSION = "2.3"; |
| private static final boolean USE_POOL = |
| Boolean.parseBoolean(System.getProperty("org.apache.jasper.runtime.JspFactoryImpl.USE_POOL", "true")); |
| private static final int POOL_SIZE = |
| Integer.parseInt(System.getProperty("org.apache.jasper.runtime.JspFactoryImpl.POOL_SIZE", "8")); |
| |
| private final ThreadLocal<PageContextPool> localPool = new ThreadLocal<>(); |
| |
| @Override |
| 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); |
| } |
| } |
| |
| @Override |
| 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); |
| } |
| } |
| |
| @Override |
| public JspEngineInfo getEngineInfo() { |
| return new JspEngineInfo() { |
| @Override |
| public String getSpecificationVersion() { |
| return SPEC_VERSION; |
| } |
| }; |
| } |
| |
| private PageContext internalGetPageContext(Servlet servlet, ServletRequest request, |
| ServletResponse response, String errorPageURL, boolean needsSession, |
| int bufferSize, boolean autoflush) { |
| |
| 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(); |
| } |
| |
| try { |
| pc.initialize(servlet, request, response, errorPageURL, |
| needsSession, bufferSize, autoflush); |
| } catch (IOException ioe) { |
| // Implementation never throws IOE but can't change the signature |
| // since it is part of the JSP API |
| } |
| |
| return pc; |
| } |
| |
| private void internalReleasePageContext(PageContext pc) { |
| pc.release(); |
| if (USE_POOL && (pc instanceof PageContextImpl)) { |
| localPool.get().put(pc); |
| } |
| } |
| |
| private static 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; |
| } |
| |
| @Override |
| public PageContext run() { |
| return factory.internalGetPageContext(servlet, request, response, |
| errorPageURL, needsSession, bufferSize, autoflush); |
| } |
| } |
| |
| private static class PrivilegedReleasePageContext |
| implements PrivilegedAction<Void> { |
| |
| private JspFactoryImpl factory; |
| private PageContext pageContext; |
| |
| PrivilegedReleasePageContext(JspFactoryImpl factory, |
| PageContext pageContext) { |
| this.factory = factory; |
| this.pageContext = pageContext; |
| } |
| |
| @Override |
| public Void run() { |
| factory.internalReleasePageContext(pageContext); |
| return null; |
| } |
| } |
| |
| private static final class PageContextPool { |
| |
| private final 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; |
| } |
| |
| } |
| |
| @Override |
| public JspApplicationContext getJspApplicationContext( |
| final ServletContext context) { |
| if (Constants.IS_SECURITY_ENABLED) { |
| return AccessController.doPrivileged( |
| new PrivilegedAction<JspApplicationContext>() { |
| @Override |
| public JspApplicationContext run() { |
| return JspApplicationContextImpl.getInstance(context); |
| } |
| }); |
| } else { |
| return JspApplicationContextImpl.getInstance(context); |
| } |
| } |
| } |