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package org.apache.tapestry.services.impl; |
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import edu.emory.mathcs.backport.java.util.concurrent.locks.ReentrantLock; |
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import ognl.ClassCacheInspector; |
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import ognl.Node; |
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import ognl.Ognl; |
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import ognl.OgnlRuntime; |
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import org.apache.hivemind.ApplicationRuntimeException; |
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import org.apache.tapestry.AbstractComponent; |
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import org.apache.tapestry.event.ReportStatusEvent; |
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import org.apache.tapestry.event.ReportStatusListener; |
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import org.apache.tapestry.event.ResetEventListener; |
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import org.apache.tapestry.services.ExpressionCache; |
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import org.apache.tapestry.services.ExpressionEvaluator; |
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|
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import java.beans.Introspector; |
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import java.util.HashMap; |
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import java.util.Map; |
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import java.util.WeakHashMap; |
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|
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|
39 | 0 | public class ExpressionCacheImpl implements ExpressionCache, ResetEventListener, ReportStatusListener, ClassCacheInspector { |
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|
41 | 0 | private final ReentrantLock _lock = new ReentrantLock(); |
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|
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private String _serviceId; |
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|
45 | 0 | private Map _cache = new WeakHashMap(); |
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|
47 | 0 | private Map _objectCache = new WeakHashMap(); |
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|
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private ExpressionEvaluator _evaluator; |
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51 | 0 | private final boolean _cachingDisabled = Boolean.getBoolean("org.apache.tapestry.disable-caching"); |
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|
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public void initializeService() |
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{ |
55 | 0 | if (_cachingDisabled) |
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{ |
57 | 0 | OgnlRuntime.setClassCacheInspector(this); |
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} |
59 | 0 | } |
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|
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public void resetEventDidOccur() |
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{ |
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try { |
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|
65 | 0 | _lock.lock(); |
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|
67 | 0 | _cache.clear(); |
68 | 0 | _objectCache.clear(); |
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|
70 | 0 | Introspector.flushCaches(); |
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|
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} finally { |
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74 | 0 | _lock.unlock(); |
75 | 0 | } |
76 | 0 | } |
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|
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public boolean shouldCache(Class type) |
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{ |
80 | 0 | if (!_cachingDisabled || type == null |
81 | 0 | || AbstractComponent.class.isAssignableFrom(type)) |
82 | 0 | return false; |
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|
84 | 0 | return true; |
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} |
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|
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public void reportStatus(ReportStatusEvent event) |
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{ |
89 | 0 | event.title(_serviceId); |
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|
91 | 0 | event.property("cached expression count", _cache.size()); |
92 | 0 | event.collection("cached expressions", _cache.keySet()); |
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|
94 | 0 | event.property("cached object expression count", _objectCache.size()); |
95 | 0 | } |
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|
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public Object getCompiledExpression(Object target, String expression) |
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{ |
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try { |
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|
101 | 0 | _lock.lock(); |
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|
103 | 0 | Map cached = (Map)_objectCache.get(target.getClass()); |
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|
105 | 0 | if (cached == null) |
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{ |
107 | 0 | cached = new HashMap(); |
108 | 0 | _objectCache.put(target.getClass(), cached); |
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} |
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|
111 | 0 | Node result = (Node)cached.get(expression); |
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|
113 | 0 | if (result == null || result.getAccessor() == null) |
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{ |
115 | 0 | result = parse(target, expression); |
116 | 0 | cached.put(expression, result); |
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} |
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|
119 | 0 | return result; |
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|
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} finally { |
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|
123 | 0 | _lock.unlock(); |
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} |
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} |
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|
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public Object getCompiledExpression(String expression) |
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{ |
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try { |
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|
131 | 0 | _lock.lock(); |
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|
133 | 0 | Object result = _cache.get(expression); |
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|
135 | 0 | if (result == null) |
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{ |
137 | 0 | result = parse(expression); |
138 | 0 | _cache.put(expression, result); |
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} |
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|
141 | 0 | return result; |
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} finally { |
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|
144 | 0 | _lock.unlock(); |
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} |
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} |
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|
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private Node parse(Object target, String expression) |
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{ |
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try |
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{ |
152 | 0 | return Ognl.compileExpression(_evaluator.createContext(target), target, expression); |
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} |
154 | 0 | catch (Exception ex) |
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{ |
156 | 0 | throw new ApplicationRuntimeException(ImplMessages.unableToParseExpression(expression,ex), ex); |
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} |
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} |
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|
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private Object parse(String expression) |
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{ |
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try |
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{ |
164 | 0 | return Ognl.parseExpression(expression); |
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} |
166 | 0 | catch (Exception ex) |
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{ |
168 | 0 | throw new ApplicationRuntimeException(ImplMessages.unableToParseExpression(expression, ex), ex); |
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} |
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} |
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|
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public void setServiceId(String serviceId) |
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{ |
174 | 0 | _serviceId = serviceId; |
175 | 0 | } |
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|
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public void setEvaluator(ExpressionEvaluator evaluator) |
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{ |
179 | 0 | _evaluator = evaluator; |
180 | 0 | } |
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|
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} |