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1
17 package org.apache.jasper.runtime;
18
19 import java.security.AccessController  ;
20 import java.security.PrivilegedAction ;
21
22 import javax.servlet.Servlet ;
23 import javax.servlet.ServletContext ;
24 import javax.servlet.ServletRequest ;
25 import javax.servlet.ServletResponse ;
26 import javax.servlet.jsp.JspApplicationContext ;
27 import javax.servlet.jsp.JspFactory ;
28 import javax.servlet.jsp.JspEngineInfo ;
29 import javax.servlet.jsp.PageContext ;
30
31 import org.apache.commons.logging.Log;
32 import org.apache.commons.logging.LogFactory;
33 import org.apache.jasper.util.SimplePool;
34
35
40 public class JspFactoryImpl extends JspFactory {
41
42 private Log log = LogFactory.getLog(JspFactoryImpl.class);
44
45 private static final String SPEC_VERSION = "2.0";
46 private static final boolean USE_POOL =
47 Boolean.valueOf(System.getProperty("org.apache.jasper.runtime.JspFactoryImpl.USE_POOL", "true")).booleanValue();
48
49 private SimplePool pool = new SimplePool( 100 );
50
51 public PageContext getPageContext(Servlet servlet,
52 ServletRequest request,
53 ServletResponse response,
54 String errorPageURL,
55 boolean needsSession,
56 int bufferSize,
57 boolean autoflush) {
58
59 if( System.getSecurityManager() != null ) {
60 PrivilegedGetPageContext dp = new PrivilegedGetPageContext(
61 (JspFactoryImpl)this, servlet, request, response, errorPageURL,
62 needsSession, bufferSize, autoflush);
63 return (PageContext )AccessController.doPrivileged(dp);
64 } else {
65 return internalGetPageContext(servlet, request, response,
66 errorPageURL, needsSession,
67 bufferSize, autoflush);
68 }
69 }
70
71 public void releasePageContext(PageContext pc) {
72 if( pc == null )
73 return;
74 if( System.getSecurityManager() != null ) {
75 PrivilegedReleasePageContext dp = new PrivilegedReleasePageContext(
76 (JspFactoryImpl)this,pc);
77 AccessController.doPrivileged(dp);
78 } else {
79 internalReleasePageContext(pc);
80 }
81 }
82
83 public JspEngineInfo getEngineInfo() {
84 return new JspEngineInfo () {
85 public String getSpecificationVersion() {
86 return SPEC_VERSION;
87 }
88 };
89 }
90
91 private PageContext internalGetPageContext(Servlet servlet,
92 ServletRequest request,
93 ServletResponse response,
94 String errorPageURL,
95 boolean needsSession,
96 int bufferSize,
97 boolean autoflush) {
98 try {
99 PageContext pc;
100 if( USE_POOL ) {
101 pc = (PageContext ) pool.get();
102 if( pc == null ) {
103 pc = new PageContextImpl();
104 }
105 } else {
106 pc = new PageContextImpl();
107 }
108 pc.initialize(servlet, request, response, errorPageURL,
109 needsSession, bufferSize, autoflush);
110 return pc;
111 } catch (Throwable ex) {
112
113 log.fatal("Exception initializing page context", ex);
114 return null;
115 }
116 }
117
118 private void internalReleasePageContext(PageContext pc) {
119 pc.release();
120 if (USE_POOL && (pc instanceof PageContextImpl)) {
121 pool.put( pc );
122 }
123 }
124
125 private class PrivilegedGetPageContext implements PrivilegedAction {
126
127 private JspFactoryImpl factory;
128 private Servlet servlet;
129 private ServletRequest request;
130 private ServletResponse response;
131 private String errorPageURL;
132 private boolean needsSession;
133 private int bufferSize;
134 private boolean autoflush;
135
136 PrivilegedGetPageContext(JspFactoryImpl factory,
137 Servlet servlet,
138 ServletRequest request,
139 ServletResponse response,
140 String errorPageURL,
141 boolean needsSession,
142 int bufferSize,
143 boolean autoflush) {
144 this.factory = factory;
145 this.servlet = servlet;
146 this.request = request;
147 this.response = response;
148 this.errorPageURL = errorPageURL;
149 this.needsSession = needsSession;
150 this.bufferSize = bufferSize;
151 this.autoflush = autoflush;
152 }
153
154 public Object run() {
155 return factory.internalGetPageContext(servlet,
156 request,
157 response,
158 errorPageURL,
159 needsSession,
160 bufferSize,
161 autoflush);
162 }
163 }
164
165 private class PrivilegedReleasePageContext implements PrivilegedAction {
166
167 private JspFactoryImpl factory;
168 private PageContext pageContext;
169
170 PrivilegedReleasePageContext(JspFactoryImpl factory,
171 PageContext pageContext) {
172 this.factory = factory;
173 this.pageContext = pageContext;
174 }
175
176 public Object run() {
177 factory.internalReleasePageContext(pageContext);
178 return null;
179 }
180 }
181
182 public JspApplicationContext getJspApplicationContext(ServletContext context) {
183 return JspApplicationContextImpl.getInstance(context);
184 }
185 }
186 |
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