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java/org/apache/jasper/runtime/JspFactoryImpl.java
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java/org/apache/jasper/runtime/JspFactoryImpl.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.jasper.runtime;
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import java.io.IOException;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import javax.servlet.Servlet;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.jsp.JspApplicationContext;
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import javax.servlet.jsp.JspEngineInfo;
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import javax.servlet.jsp.JspFactory;
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import javax.servlet.jsp.PageContext;
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import org.apache.jasper.Constants;
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/**
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* Implementation of JspFactory.
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*
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* @author Anil K. Vijendran
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*/
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public class JspFactoryImpl extends JspFactory {
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private static final String SPEC_VERSION = "2.3";
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private static final boolean USE_POOL =
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Boolean.parseBoolean(System.getProperty("org.apache.jasper.runtime.JspFactoryImpl.USE_POOL", "true"));
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private static final int POOL_SIZE =
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Integer.parseInt(System.getProperty("org.apache.jasper.runtime.JspFactoryImpl.POOL_SIZE", "8"));
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private final ThreadLocal<PageContextPool> localPool = new ThreadLocal<>();
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@Override
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public PageContext getPageContext(Servlet servlet, ServletRequest request,
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ServletResponse response, String errorPageURL, boolean needsSession,
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int bufferSize, boolean autoflush) {
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if( Constants.IS_SECURITY_ENABLED ) {
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PrivilegedGetPageContext dp = new PrivilegedGetPageContext(
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this, servlet, request, response, errorPageURL,
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needsSession, bufferSize, autoflush);
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return AccessController.doPrivileged(dp);
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} else {
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return internalGetPageContext(servlet, request, response,
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errorPageURL, needsSession,
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bufferSize, autoflush);
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}
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}
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@Override
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public void releasePageContext(PageContext pc) {
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if( pc == null )
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return;
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if( Constants.IS_SECURITY_ENABLED ) {
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PrivilegedReleasePageContext dp = new PrivilegedReleasePageContext(
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this,pc);
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AccessController.doPrivileged(dp);
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} else {
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internalReleasePageContext(pc);
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}
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}
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@Override
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public JspEngineInfo getEngineInfo() {
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return new JspEngineInfo() {
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@Override
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public String getSpecificationVersion() {
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return SPEC_VERSION;
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}
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};
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}
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private PageContext internalGetPageContext(Servlet servlet, ServletRequest request,
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ServletResponse response, String errorPageURL, boolean needsSession,
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int bufferSize, boolean autoflush) {
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PageContext pc;
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if (USE_POOL) {
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PageContextPool pool = localPool.get();
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if (pool == null) {
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pool = new PageContextPool();
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localPool.set(pool);
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}
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pc = pool.get();
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if (pc == null) {
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pc = new PageContextImpl();
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}
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} else {
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pc = new PageContextImpl();
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}
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try {
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pc.initialize(servlet, request, response, errorPageURL,
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needsSession, bufferSize, autoflush);
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} catch (IOException ioe) {
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// Implementation never throws IOE but can't change the signature
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// since it is part of the JSP API
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}
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return pc;
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}
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private void internalReleasePageContext(PageContext pc) {
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pc.release();
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if (USE_POOL && (pc instanceof PageContextImpl)) {
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localPool.get().put(pc);
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}
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}
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private static class PrivilegedGetPageContext
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implements PrivilegedAction<PageContext> {
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private JspFactoryImpl factory;
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private Servlet servlet;
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private ServletRequest request;
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private ServletResponse response;
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private String errorPageURL;
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private boolean needsSession;
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private int bufferSize;
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private boolean autoflush;
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PrivilegedGetPageContext(JspFactoryImpl factory, Servlet servlet,
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ServletRequest request, ServletResponse response, String errorPageURL,
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boolean needsSession, int bufferSize, boolean autoflush) {
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this.factory = factory;
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this.servlet = servlet;
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this.request = request;
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this.response = response;
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this.errorPageURL = errorPageURL;
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this.needsSession = needsSession;
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this.bufferSize = bufferSize;
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this.autoflush = autoflush;
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}
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@Override
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public PageContext run() {
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return factory.internalGetPageContext(servlet, request, response,
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errorPageURL, needsSession, bufferSize, autoflush);
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}
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}
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private static class PrivilegedReleasePageContext
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implements PrivilegedAction<Void> {
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private JspFactoryImpl factory;
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private PageContext pageContext;
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PrivilegedReleasePageContext(JspFactoryImpl factory,
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PageContext pageContext) {
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this.factory = factory;
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this.pageContext = pageContext;
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}
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@Override
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public Void run() {
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factory.internalReleasePageContext(pageContext);
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return null;
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}
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}
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private static final class PageContextPool {
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private final PageContext[] pool;
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private int current = -1;
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public PageContextPool() {
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this.pool = new PageContext[POOL_SIZE];
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}
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public void put(PageContext o) {
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if (current < (POOL_SIZE - 1)) {
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current++;
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pool[current] = o;
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}
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}
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public PageContext get() {
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PageContext item = null;
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if (current >= 0) {
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item = pool[current];
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current--;
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}
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return item;
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}
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}
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@Override
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public JspApplicationContext getJspApplicationContext(
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final ServletContext context) {
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if (Constants.IS_SECURITY_ENABLED) {
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return AccessController.doPrivileged(
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new PrivilegedAction<JspApplicationContext>() {
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@Override
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public JspApplicationContext run() {
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return JspApplicationContextImpl.getInstance(context);
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}
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});
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} else {
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return JspApplicationContextImpl.getInstance(context);
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}
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}
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}
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