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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 org.apache.commons.logging.Log; |
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import org.apache.hivemind.ApplicationRuntimeException; |
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import org.apache.hivemind.ClassResolver; |
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import org.apache.hivemind.service.ClassFactory; |
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import org.apache.hivemind.util.Defense; |
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import org.apache.tapestry.enhance.EnhancedClassValidator; |
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import org.apache.tapestry.enhance.EnhancementOperationImpl; |
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import org.apache.tapestry.enhance.EnhancementWorker; |
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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.ComponentConstructor; |
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import org.apache.tapestry.services.ComponentConstructorFactory; |
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import org.apache.tapestry.spec.IComponentSpecification; |
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import java.util.Collections; |
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import java.util.HashMap; |
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import java.util.Map; |
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public class ComponentConstructorFactoryImpl implements ComponentConstructorFactory, |
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ResetEventListener, ReportStatusListener |
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{ |
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private final ReentrantLock _lock = new ReentrantLock(); |
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private String _serviceId; |
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private Log _log; |
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private ClassFactory _classFactory; |
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private ClassResolver _classResolver; |
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private EnhancedClassValidator _validator; |
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private EnhancementWorker _chain; |
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private Map _cachedConstructors = Collections.synchronizedMap(new HashMap()); |
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public void resetEventDidOccur() |
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{ |
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_cachedConstructors.clear(); |
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} |
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public synchronized void reportStatus(ReportStatusEvent event) |
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{ |
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event.title(_serviceId); |
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event.property("enhanced class count", _cachedConstructors.size()); |
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event.collection("enhanced classes", _cachedConstructors.keySet()); |
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} |
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public ComponentConstructor getComponentConstructor(IComponentSpecification specification, |
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String className) |
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{ |
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Defense.notNull(specification, "specification"); |
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try |
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{ |
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_lock.lockInterruptibly(); |
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ComponentConstructor result = (ComponentConstructor) _cachedConstructors.get(specification); |
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if (result == null) |
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{ |
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Class baseClass = _classResolver.findClass(className); |
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EnhancementOperationImpl eo = new EnhancementOperationImpl(_classResolver, specification, baseClass, _classFactory, _log); |
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_chain.performEnhancement(eo, specification); |
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result = eo.getConstructor(); |
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_validator.validate(baseClass, result.getComponentClass(), specification); |
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_cachedConstructors.put(specification, result); |
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} |
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return result; |
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} catch (InterruptedException e) |
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{ |
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throw new ApplicationRuntimeException(e); |
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} finally |
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{ |
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_lock.unlock(); |
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} |
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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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public void setClassResolver(ClassResolver classResolver) |
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{ |
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_classResolver = classResolver; |
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} |
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public void setValidator(EnhancedClassValidator validator) |
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{ |
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_validator = validator; |
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} |
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public void setChain(EnhancementWorker chain) |
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{ |
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_chain = chain; |
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} |
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public void setLog(Log log) |
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{ |
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_log = log; |
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} |
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public void setServiceId(String serviceId) |
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{ |
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_serviceId = serviceId; |
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} |
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} |