1 | |
|
2 | |
|
3 | |
|
4 | |
|
5 | |
|
6 | |
|
7 | |
|
8 | |
|
9 | |
|
10 | |
|
11 | |
|
12 | |
|
13 | |
|
14 | |
|
15 | |
package org.apache.tapestry.services.impl; |
16 | |
|
17 | |
import ognl.*; |
18 | |
import ognl.enhance.ExpressionAccessor; |
19 | |
import org.apache.commons.pool.impl.GenericObjectPool; |
20 | |
import org.apache.hivemind.ApplicationRuntimeException; |
21 | |
import org.apache.hivemind.events.RegistryShutdownListener; |
22 | |
import org.apache.hivemind.service.ClassFactory; |
23 | |
import org.apache.tapestry.Tapestry; |
24 | |
import org.apache.tapestry.services.ExpressionCache; |
25 | |
import org.apache.tapestry.services.ExpressionEvaluator; |
26 | |
import org.apache.tapestry.spec.IApplicationSpecification; |
27 | |
|
28 | |
import java.beans.Introspector; |
29 | |
import java.util.Iterator; |
30 | |
import java.util.List; |
31 | |
import java.util.Map; |
32 | |
|
33 | |
|
34 | |
|
35 | |
|
36 | 0 | public class ExpressionEvaluatorImpl implements ExpressionEvaluator, RegistryShutdownListener { |
37 | |
|
38 | |
private static final long POOL_MIN_IDLE_TIME = 1000 * 60 * 50; |
39 | |
|
40 | |
private static final long POOL_SLEEP_TIME = 1000 * 60 * 4; |
41 | |
|
42 | |
|
43 | |
|
44 | 0 | private final ClassResolver _ognlResolver = new OgnlClassResolver(); |
45 | |
|
46 | |
private ExpressionCache _expressionCache; |
47 | |
|
48 | |
private IApplicationSpecification _applicationSpecification; |
49 | |
|
50 | |
private TypeConverter _typeConverter; |
51 | |
|
52 | |
private List _contributions; |
53 | |
|
54 | |
private List _nullHandlerContributions; |
55 | |
|
56 | |
|
57 | |
|
58 | |
|
59 | |
private Map _defaultContext; |
60 | |
|
61 | |
private ClassFactory _classFactory; |
62 | |
|
63 | |
private GenericObjectPool _contextPool; |
64 | |
|
65 | |
public void setApplicationSpecification(IApplicationSpecification applicationSpecification) |
66 | |
{ |
67 | 0 | _applicationSpecification = applicationSpecification; |
68 | 0 | } |
69 | |
|
70 | |
public void initializeService() |
71 | |
{ |
72 | 0 | if (_applicationSpecification.checkExtension(Tapestry.OGNL_TYPE_CONVERTER)) |
73 | 0 | _typeConverter = (TypeConverter) _applicationSpecification.getExtension(Tapestry.OGNL_TYPE_CONVERTER, TypeConverter.class); |
74 | |
|
75 | 0 | Iterator i = _contributions.iterator(); |
76 | |
|
77 | 0 | while (i.hasNext()) |
78 | |
{ |
79 | 0 | PropertyAccessorContribution c = (PropertyAccessorContribution) i.next(); |
80 | |
|
81 | 0 | OgnlRuntime.setPropertyAccessor(c.getSubjectClass(), c.getAccessor()); |
82 | 0 | } |
83 | |
|
84 | 0 | Iterator j = _nullHandlerContributions.iterator(); |
85 | |
|
86 | 0 | while (j.hasNext()) |
87 | |
{ |
88 | 0 | NullHandlerContribution h = (NullHandlerContribution) j.next(); |
89 | |
|
90 | 0 | OgnlRuntime.setNullHandler(h.getSubjectClass(), h.getHandler()); |
91 | 0 | } |
92 | |
|
93 | 0 | _defaultContext = Ognl.createDefaultContext(null, _ognlResolver, _typeConverter); |
94 | |
|
95 | 0 | OgnlRuntime.setCompiler(new HiveMindExpressionCompiler(_classFactory)); |
96 | |
|
97 | 0 | _contextPool = new GenericObjectPool(new PoolableOgnlContextFactory(_ognlResolver, _typeConverter)); |
98 | |
|
99 | 0 | _contextPool.setMaxActive(-1); |
100 | 0 | _contextPool.setMaxIdle(-1); |
101 | 0 | _contextPool.setMinEvictableIdleTimeMillis(POOL_MIN_IDLE_TIME); |
102 | 0 | _contextPool.setTimeBetweenEvictionRunsMillis(POOL_SLEEP_TIME); |
103 | 0 | } |
104 | |
|
105 | |
public Object read(Object target, String expression) |
106 | |
{ |
107 | 0 | Node node = (Node)_expressionCache.getCompiledExpression(target, expression); |
108 | |
|
109 | 0 | if (node.getAccessor() != null) |
110 | 0 | return read(target, node.getAccessor()); |
111 | |
|
112 | 0 | return readCompiled(target, node); |
113 | |
} |
114 | |
|
115 | |
public Object readCompiled(Object target, Object expression) |
116 | |
{ |
117 | 0 | OgnlContext context = null; |
118 | |
try |
119 | |
{ |
120 | 0 | context = (OgnlContext)_contextPool.borrowObject(); |
121 | 0 | context.setRoot(target); |
122 | |
|
123 | 0 | return Ognl.getValue(expression, context, target); |
124 | |
} |
125 | 0 | catch (Exception ex) |
126 | |
{ |
127 | 0 | throw new ApplicationRuntimeException(ImplMessages.unableToReadExpression(ImplMessages |
128 | |
.parsedExpression(), target, ex), target, null, ex); |
129 | |
} finally { |
130 | 0 | try { if (context != null) _contextPool.returnObject(context); } catch (Exception e) {} |
131 | |
} |
132 | |
} |
133 | |
|
134 | |
public Object read(Object target, ExpressionAccessor expression) |
135 | |
{ |
136 | 0 | OgnlContext context = null; |
137 | |
try |
138 | |
{ |
139 | 0 | context = (OgnlContext)_contextPool.borrowObject(); |
140 | |
|
141 | 0 | return expression.get(context, target); |
142 | |
} |
143 | 0 | catch (Exception ex) |
144 | |
{ |
145 | 0 | throw new ApplicationRuntimeException(ImplMessages.unableToReadExpression(ImplMessages.parsedExpression(), |
146 | |
target, ex), target, null, ex); |
147 | |
} finally { |
148 | 0 | try { if (context != null) _contextPool.returnObject(context); } catch (Exception e) {} |
149 | |
} |
150 | |
} |
151 | |
|
152 | |
public OgnlContext createContext(Object target) |
153 | |
{ |
154 | 0 | OgnlContext result = (OgnlContext)Ognl.createDefaultContext(target, _ognlResolver); |
155 | |
|
156 | 0 | if (_typeConverter != null) |
157 | 0 | Ognl.setTypeConverter(result, _typeConverter); |
158 | |
|
159 | 0 | return result; |
160 | |
} |
161 | |
|
162 | |
public void write(Object target, String expression, Object value) |
163 | |
{ |
164 | 0 | writeCompiled(target, _expressionCache.getCompiledExpression(target, expression), value); |
165 | 0 | } |
166 | |
|
167 | |
public void write(Object target, ExpressionAccessor expression, Object value) |
168 | |
{ |
169 | 0 | OgnlContext context = null; |
170 | |
try |
171 | |
{ |
172 | 0 | context = (OgnlContext)_contextPool.borrowObject(); |
173 | |
|
174 | |
|
175 | |
|
176 | 0 | context.setRoot(target); |
177 | |
|
178 | 0 | expression.set(context, target, value); |
179 | |
} |
180 | 0 | catch (Exception ex) |
181 | |
{ |
182 | 0 | throw new ApplicationRuntimeException(ImplMessages.unableToWriteExpression(ImplMessages |
183 | |
.parsedExpression(), target, value, ex), target, null, ex); |
184 | |
} finally { |
185 | 0 | try { if (context != null) _contextPool.returnObject(context); } catch (Exception e) {} |
186 | 0 | } |
187 | 0 | } |
188 | |
|
189 | |
public void writeCompiled(Object target, Object expression, Object value) |
190 | |
{ |
191 | 0 | OgnlContext context = null; |
192 | |
try |
193 | |
{ |
194 | 0 | context = (OgnlContext)_contextPool.borrowObject(); |
195 | |
|
196 | 0 | Ognl.setValue(expression, context, target, value); |
197 | |
} |
198 | 0 | catch (Exception ex) |
199 | |
{ |
200 | 0 | throw new ApplicationRuntimeException(ImplMessages.unableToWriteExpression(ImplMessages |
201 | |
.parsedExpression(), target, value, ex), target, null, ex); |
202 | |
} finally { |
203 | 0 | try { if (context != null) _contextPool.returnObject(context); } catch (Exception e) {} |
204 | 0 | } |
205 | 0 | } |
206 | |
|
207 | |
public boolean isConstant(Object target, String expression) |
208 | |
{ |
209 | 0 | Object compiled = _expressionCache.getCompiledExpression(target, expression); |
210 | |
|
211 | |
try |
212 | |
{ |
213 | 0 | return Ognl.isConstant(compiled, _defaultContext); |
214 | |
} |
215 | 0 | catch (Exception ex) |
216 | |
{ |
217 | 0 | throw new ApplicationRuntimeException(ImplMessages.isConstantExpressionError( |
218 | |
expression, |
219 | |
ex), ex); |
220 | |
} |
221 | |
} |
222 | |
|
223 | |
public boolean isConstant(String expression) |
224 | |
{ |
225 | 0 | Object compiled = _expressionCache.getCompiledExpression(expression); |
226 | |
|
227 | |
try |
228 | |
{ |
229 | 0 | return Ognl.isConstant(compiled, _defaultContext); |
230 | |
} |
231 | 0 | catch (Exception ex) |
232 | |
{ |
233 | 0 | throw new ApplicationRuntimeException(ImplMessages.isConstantExpressionError( |
234 | |
expression, |
235 | |
ex), ex); |
236 | |
} |
237 | |
} |
238 | |
|
239 | |
public void registryDidShutdown() |
240 | |
{ |
241 | |
try |
242 | |
{ |
243 | 0 | _contextPool.clear(); |
244 | 0 | _contextPool.close(); |
245 | |
|
246 | 0 | OgnlRuntime.clearCache(); |
247 | 0 | Introspector.flushCaches(); |
248 | |
|
249 | 0 | } catch (Exception et) { |
250 | |
|
251 | 0 | } |
252 | 0 | } |
253 | |
|
254 | |
public void setExpressionCache(ExpressionCache expressionCache) |
255 | |
{ |
256 | 0 | _expressionCache = expressionCache; |
257 | 0 | } |
258 | |
|
259 | |
public void setContributions(List contributions) |
260 | |
{ |
261 | 0 | _contributions = contributions; |
262 | 0 | } |
263 | |
|
264 | |
public void setNullHandlerContributions(List nullHandlerContributions) |
265 | |
{ |
266 | 0 | _nullHandlerContributions = nullHandlerContributions; |
267 | 0 | } |
268 | |
|
269 | |
public void setClassFactory(ClassFactory classFactory) |
270 | |
{ |
271 | 0 | _classFactory = classFactory; |
272 | 0 | } |
273 | |
} |