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package org.mule.cache; |
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import org.mule.api.MuleEvent; |
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import org.mule.api.MuleException; |
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import org.mule.api.ThreadSafeAccess; |
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import org.mule.api.processor.MessageProcessor; |
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import org.mule.api.routing.filter.Filter; |
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import org.mule.api.store.ObjectAlreadyExistsException; |
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import org.mule.api.store.ObjectDoesNotExistException; |
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import org.mule.api.store.ObjectStore; |
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import org.mule.api.store.ObjectStoreException; |
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import org.mule.cache.filter.ConsumableMuleMessageFilter; |
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import org.mule.cache.keygenerator.KeyGenerator; |
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import org.mule.cache.keygenerator.MD5KeyGenerator; |
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import org.mule.cache.responsegenerator.DefaultResponseGenerator; |
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import org.mule.cache.responsegenerator.ResponseGenerator; |
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import org.mule.util.store.InMemoryObjectStore; |
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import java.io.Serializable; |
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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39 | 0 | public class ObjectStoreCachingStrategy implements CachingStrategy |
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{ |
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|
42 | 0 | protected Log logger = LogFactory.getLog(getClass()); |
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|
44 | 0 | private ObjectStore<MuleEvent> store = new InMemoryObjectStore<MuleEvent>(); |
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|
46 | 0 | private KeyGenerator keyGenerator = new MD5KeyGenerator(); |
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48 | 0 | private ResponseGenerator responseGenerator = new DefaultResponseGenerator(); |
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50 | 0 | private Filter consumableFilter = new ConsumableMuleMessageFilter(); |
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private String name; |
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public MuleEvent process(MuleEvent request, MessageProcessor messageProcessor) throws MuleException |
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{ |
56 | 0 | if (consumableFilter.accept(request.getMessage())) |
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{ |
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Serializable key; |
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try |
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{ |
61 | 0 | key = keyGenerator.generateKey(request); |
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} |
63 | 0 | catch (Exception e) |
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{ |
65 | 0 | logger.warn("Message will be processed without cache: key generation error", e); |
66 | 0 | return messageProcessor.process(request); |
67 | 0 | } |
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|
69 | 0 | return processMessageWithCache(key, request, messageProcessor); |
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} |
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else |
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{ |
73 | 0 | return messageProcessor.process(request); |
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} |
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} |
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private MuleEvent processMessageWithCache(Serializable key, MuleEvent request, MessageProcessor messageProcessor) throws MuleException |
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{ |
79 | 0 | MuleEvent cachedResponse = lookupEventInCache(key); |
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MuleEvent response; |
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|
83 | 0 | if (cachedResponse != null) |
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{ |
85 | 0 | response = responseGenerator.create(request, cachedResponse); |
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} |
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else |
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{ |
89 | 0 | response = messageProcessor.process(request); |
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|
91 | 0 | if (response == null || consumableFilter.accept(response.getMessage())) |
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{ |
93 | 0 | MuleEvent responseCopy = response; |
94 | 0 | if (response instanceof ThreadSafeAccess) |
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{ |
96 | 0 | responseCopy = (MuleEvent) ((ThreadSafeAccess) response).newThreadCopy(); |
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} |
98 | 0 | store(key, responseCopy); |
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} |
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} |
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102 | 0 | return response; |
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} |
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private MuleEvent lookupEventInCache(Serializable key) |
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{ |
107 | 0 | MuleEvent event = retrieve(key); |
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|
109 | 0 | if (logger.isDebugEnabled()) |
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{ |
111 | 0 | if (event != null) |
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{ |
113 | 0 | logger.debug("Cache hit for key: " + key + " Event: " + event); |
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} |
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else |
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{ |
117 | 0 | logger.debug("Cache miss for key: " + key); |
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} |
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} |
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121 | 0 | return event; |
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} |
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protected void store(Serializable key, MuleEvent value) |
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{ |
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try |
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{ |
128 | 0 | store.store(key, value); |
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} |
130 | 0 | catch (ObjectAlreadyExistsException e) |
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{ |
132 | 0 | if (logger.isInfoEnabled()) |
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{ |
134 | 0 | logger.info("An object with the specified key already exists in the object store (" + key + ")"); |
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} |
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} |
137 | 0 | catch (ObjectStoreException e) |
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{ |
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143 | 0 | logger.warn("Unable to store event in cache", e); |
144 | 0 | } |
145 | 0 | } |
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protected MuleEvent retrieve(Serializable key) |
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{ |
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try |
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{ |
151 | 0 | return store.retrieve(key); |
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} |
153 | 0 | catch (ObjectDoesNotExistException e) |
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{ |
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} |
157 | 0 | catch (ObjectStoreException e) |
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{ |
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163 | 0 | logger.warn("Unable to retrieve object from cache", e); |
164 | 0 | } |
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166 | 0 | return null; |
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} |
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public ObjectStore<MuleEvent> getStore() |
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{ |
171 | 0 | return store; |
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} |
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public void setStore(ObjectStore<MuleEvent> store) |
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{ |
176 | 0 | this.store = store; |
177 | 0 | } |
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public KeyGenerator getKeyGenerator() |
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{ |
181 | 0 | return keyGenerator; |
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} |
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public void setKeyGenerator(KeyGenerator keyGenerator) |
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{ |
186 | 0 | this.keyGenerator = keyGenerator; |
187 | 0 | } |
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public ResponseGenerator getResponseGenerator() |
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{ |
191 | 0 | return responseGenerator; |
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} |
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public void setResponseGenerator(ResponseGenerator responseGenerator) |
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{ |
196 | 0 | this.responseGenerator = responseGenerator; |
197 | 0 | } |
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public Filter getConsumableFilter() |
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{ |
201 | 0 | return consumableFilter; |
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} |
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public void setConsumableFilter(Filter consumableFilter) |
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{ |
206 | 0 | this.consumableFilter = consumableFilter; |
207 | 0 | } |
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public String getName() |
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{ |
211 | 0 | return name; |
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} |
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public void setName(String name) |
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{ |
216 | 0 | this.name = name; |
217 | 0 | } |
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} |