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package org.apache.tapestry.services.impl; |
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import ognl.*; |
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import ognl.enhance.ExpressionAccessor; |
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import org.apache.commons.pool.impl.GenericObjectPool; |
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import org.apache.hivemind.ApplicationRuntimeException; |
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import org.apache.hivemind.events.RegistryShutdownListener; |
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import org.apache.hivemind.service.ClassFactory; |
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import org.apache.tapestry.Tapestry; |
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import org.apache.tapestry.services.ExpressionCache; |
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import org.apache.tapestry.services.ExpressionEvaluator; |
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import org.apache.tapestry.spec.IApplicationSpecification; |
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import java.beans.Introspector; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.Map; |
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public class ExpressionEvaluatorImpl implements ExpressionEvaluator, RegistryShutdownListener { |
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private static final long POOL_MIN_IDLE_TIME = 1000 * 60 * 50; |
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private static final long POOL_SLEEP_TIME = 1000 * 60 * 4; |
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private final ClassResolver _ognlResolver = new OgnlClassResolver(); |
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private ExpressionCache _expressionCache; |
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private IApplicationSpecification _applicationSpecification; |
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private TypeConverter _typeConverter; |
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private List _contributions; |
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private List _nullHandlerContributions; |
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private Map _defaultContext; |
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private ClassFactory _classFactory; |
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private GenericObjectPool _contextPool; |
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public void setApplicationSpecification(IApplicationSpecification applicationSpecification) |
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{ |
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_applicationSpecification = applicationSpecification; |
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} |
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public void initializeService() |
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{ |
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if (_applicationSpecification.checkExtension(Tapestry.OGNL_TYPE_CONVERTER)) |
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_typeConverter = (TypeConverter) _applicationSpecification.getExtension(Tapestry.OGNL_TYPE_CONVERTER, |
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TypeConverter.class); |
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Iterator i = _contributions.iterator(); |
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while (i.hasNext()) |
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{ |
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PropertyAccessorContribution c = (PropertyAccessorContribution) i.next(); |
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OgnlRuntime.setPropertyAccessor(c.getSubjectClass(), c.getAccessor()); |
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} |
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Iterator j = _nullHandlerContributions.iterator(); |
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while (j.hasNext()) |
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{ |
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NullHandlerContribution h = (NullHandlerContribution) j.next(); |
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OgnlRuntime.setNullHandler(h.getSubjectClass(), h.getHandler()); |
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} |
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_defaultContext = Ognl.createDefaultContext(null, _ognlResolver, _typeConverter); |
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OgnlRuntime.setCompiler(new HiveMindExpressionCompiler(_classFactory)); |
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_contextPool = new GenericObjectPool(new PoolableOgnlContextFactory(_ognlResolver, _typeConverter)); |
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_contextPool.setMaxActive(-1); |
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_contextPool.setMaxIdle(-1); |
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_contextPool.setMinEvictableIdleTimeMillis(POOL_MIN_IDLE_TIME); |
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_contextPool.setTimeBetweenEvictionRunsMillis(POOL_SLEEP_TIME); |
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} |
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public Object read(Object target, String expression) |
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{ |
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Node node = (Node)_expressionCache.getCompiledExpression(target, expression); |
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if (node.getAccessor() != null) |
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return read(target, node.getAccessor()); |
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return readCompiled(target, node); |
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} |
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public Object readCompiled(Object target, Object expression) |
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{ |
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OgnlContext context = null; |
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try |
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{ |
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context = (OgnlContext)_contextPool.borrowObject(); |
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context.setRoot(target); |
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return Ognl.getValue(expression, context, target); |
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} |
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catch (Exception ex) |
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{ |
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throw new ApplicationRuntimeException(ImplMessages.unableToReadExpression(ImplMessages |
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.parsedExpression(), target, ex), target, null, ex); |
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} finally { |
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try { if (context != null) _contextPool.returnObject(context); } catch (Exception e) {} |
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} |
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} |
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public Object read(Object target, ExpressionAccessor expression) |
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{ |
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OgnlContext context = null; |
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try |
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{ |
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context = (OgnlContext)_contextPool.borrowObject(); |
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return expression.get(context, target); |
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} |
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catch (Exception ex) |
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{ |
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throw new ApplicationRuntimeException(ImplMessages.unableToReadExpression(ImplMessages |
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.parsedExpression(), target, ex), target, null, ex); |
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} finally { |
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try { if (context != null) _contextPool.returnObject(context); } catch (Exception e) {} |
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} |
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} |
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public OgnlContext createContext(Object target) |
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{ |
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OgnlContext result = (OgnlContext)Ognl.createDefaultContext(target, _ognlResolver); |
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if (_typeConverter != null) |
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Ognl.setTypeConverter(result, _typeConverter); |
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return result; |
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} |
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public void write(Object target, String expression, Object value) |
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{ |
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writeCompiled(target, _expressionCache.getCompiledExpression(target, expression), value); |
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} |
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public void write(Object target, ExpressionAccessor expression, Object value) |
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{ |
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OgnlContext context = null; |
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try |
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{ |
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context = (OgnlContext)_contextPool.borrowObject(); |
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expression.set(context, target, value); |
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} |
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catch (Exception ex) |
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{ |
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throw new ApplicationRuntimeException(ImplMessages.unableToWriteExpression(ImplMessages |
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.parsedExpression(), target, value, ex), target, null, ex); |
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} finally { |
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try { if (context != null) _contextPool.returnObject(context); } catch (Exception e) {} |
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} |
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} |
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public void writeCompiled(Object target, Object expression, Object value) |
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{ |
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OgnlContext context = null; |
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try |
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{ |
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context = (OgnlContext)_contextPool.borrowObject(); |
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Ognl.setValue(expression, context, target, value); |
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} |
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catch (Exception ex) |
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{ |
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throw new ApplicationRuntimeException(ImplMessages.unableToWriteExpression(ImplMessages |
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.parsedExpression(), target, value, ex), target, null, ex); |
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} finally { |
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try { if (context != null) _contextPool.returnObject(context); } catch (Exception e) {} |
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} |
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} |
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public boolean isConstant(Object target, String expression) |
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{ |
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Object compiled = _expressionCache.getCompiledExpression(target, expression); |
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try |
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return Ognl.isConstant(compiled, _defaultContext); |
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} |
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catch (Exception ex) |
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{ |
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throw new ApplicationRuntimeException(ImplMessages.isConstantExpressionError( |
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expression, |
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ex), ex); |
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} |
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} |
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public boolean isConstant(String expression) |
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{ |
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Object compiled = _expressionCache.getCompiledExpression(expression); |
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try |
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{ |
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return Ognl.isConstant(compiled, _defaultContext); |
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} |
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catch (Exception ex) |
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{ |
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throw new ApplicationRuntimeException(ImplMessages.isConstantExpressionError( |
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expression, |
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ex), ex); |
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} |
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} |
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public void registryDidShutdown() |
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{ |
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try |
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{ |
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_contextPool.clear(); |
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_contextPool.close(); |
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OgnlRuntime.clearCache(); |
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Introspector.flushCaches(); |
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} catch (Exception et) { |
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} |
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} |
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public void setExpressionCache(ExpressionCache expressionCache) |
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{ |
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_expressionCache = expressionCache; |
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} |
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public void setContributions(List contributions) |
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{ |
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_contributions = contributions; |
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} |
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public void setNullHandlerContributions(List nullHandlerContributions) |
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{ |
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_nullHandlerContributions = nullHandlerContributions; |
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} |
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public void setClassFactory(ClassFactory classFactory) |
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{ |
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_classFactory = classFactory; |
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} |
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} |