| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.cocoon.components.pipeline.impl; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.io.Serializable; |
| import java.util.ArrayList; |
| import java.util.Date; |
| |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.apache.avalon.framework.parameters.ParameterException; |
| import org.apache.avalon.framework.parameters.Parameters; |
| import org.apache.avalon.framework.service.ServiceException; |
| import org.apache.cocoon.ProcessingException; |
| import org.apache.cocoon.caching.CacheableProcessingComponent; |
| import org.apache.cocoon.caching.CachedResponse; |
| import org.apache.cocoon.caching.CachingOutputStream; |
| import org.apache.cocoon.caching.ComponentCacheKey; |
| import org.apache.cocoon.caching.PipelineCacheKey; |
| import org.apache.cocoon.environment.Environment; |
| import org.apache.cocoon.transformation.Transformer; |
| import org.apache.cocoon.util.HashUtil; |
| import org.apache.excalibur.source.SourceValidity; |
| import org.apache.excalibur.source.impl.validity.AggregatedValidity; |
| import org.apache.excalibur.source.impl.validity.DeferredValidity; |
| import org.apache.excalibur.source.impl.validity.NOPValidity; |
| import org.apache.excalibur.store.Store; |
| |
| /** |
| * This is the base class for all caching pipeline implementations |
| * that check different pipeline components. |
| * |
| * @since 2.1 |
| * @version $Id$ |
| */ |
| public abstract class AbstractCachingProcessingPipeline extends BaseCachingProcessingPipeline { |
| |
| public static final String PIPELOCK_PREFIX = "PIPELOCK:"; |
| |
| /** The role name of the generator */ |
| protected String generatorRole; |
| |
| /** The role names of the transfomrers */ |
| protected ArrayList transformerRoles = new ArrayList(); |
| |
| /** The role name of the serializer */ |
| protected String serializerRole; |
| |
| /** The role name of the reader */ |
| protected String readerRole; |
| |
| /** The cached response */ |
| protected CachedResponse cachedResponse; |
| |
| /** The index indicating the first transformer getting input from the cache */ |
| protected int firstProcessedTransformerIndex; |
| |
| /** Complete response is cached */ |
| protected boolean completeResponseIsCached; |
| |
| |
| /** This key indicates the response that is fetched from the cache */ |
| protected PipelineCacheKey fromCacheKey; |
| |
| /** This key indicates the response that will get into the cache */ |
| protected PipelineCacheKey toCacheKey; |
| |
| /** The source validities used for caching */ |
| protected SourceValidity[] toCacheSourceValidities; |
| |
| /** The index indicating to the first transformer which is not cacheable */ |
| protected int firstNotCacheableTransformerIndex; |
| |
| /** Cache complete response */ |
| protected boolean cacheCompleteResponse; |
| |
| protected Store transientStore = null; |
| |
| /** Abstract method defined in subclasses |
| * @return <u>complete</u> cached response or <code>null</code><br> |
| * See issue COCOON-2009 for discussion*/ |
| protected abstract CachedResponse cacheResults(Environment environment, |
| OutputStream os) |
| throws Exception; |
| |
| /** Abstract method defined in subclasses */ |
| protected abstract ComponentCacheKey newComponentCacheKey(int type, |
| String role, |
| Serializable key); |
| |
| /** Abstract method defined in subclasses */ |
| protected abstract void connectCachingPipeline(Environment environment) |
| throws ProcessingException; |
| |
| /** |
| * Parameterizable Interface - Configuration |
| */ |
| public void parameterize(Parameters params) |
| throws ParameterException { |
| super.parameterize(params); |
| |
| String storeRole = params.getParameter("store-role",Store.TRANSIENT_STORE); |
| |
| try { |
| transientStore = (Store) manager.lookup(storeRole); |
| } catch (ServiceException e) { |
| if(getLogger().isDebugEnabled()) { |
| getLogger().debug("Could not look up transient store, synchronizing requests will not work!",e); |
| } |
| } |
| } |
| |
| /** |
| * Set the generator. |
| */ |
| public void setGenerator (String role, String source, Parameters param, |
| Parameters hintParam) |
| throws ProcessingException { |
| super.setGenerator(role, source, param, hintParam); |
| this.generatorRole = role; |
| } |
| |
| /** |
| * Add a transformer. |
| */ |
| public void addTransformer (String role, String source, Parameters param, |
| Parameters hintParam) throws ProcessingException { |
| super.addTransformer(role, source, param, hintParam); |
| this.transformerRoles.add(role); |
| } |
| |
| /** |
| * Set the serializer. |
| */ |
| public void setSerializer (String role, String source, Parameters param, |
| Parameters hintParam, String mimeType) throws ProcessingException { |
| super.setSerializer(role, source, param, hintParam, mimeType); |
| this.serializerRole = role; |
| } |
| |
| /** |
| * Set the Reader. |
| */ |
| public void setReader (String role, String source, Parameters param, |
| String mimeType) |
| throws ProcessingException { |
| super.setReader(role, source, param, mimeType); |
| this.readerRole = role; |
| } |
| |
| protected boolean waitForLock(Object key) { |
| if(transientStore != null) { |
| Object lock = null; |
| synchronized(transientStore) { |
| String lockKey = PIPELOCK_PREFIX+key; |
| if(transientStore.containsKey(lockKey)) { |
| // cache content is currently being generated, wait for other thread |
| lock = transientStore.get(lockKey); |
| } |
| } |
| // Avoid deadlock with self (see JIRA COCOON-1985). |
| if(lock != null && lock != Thread.currentThread()) { |
| try { |
| // become owner of monitor |
| synchronized(lock) { |
| lock.wait(); |
| } |
| } catch (InterruptedException e) { |
| if(getLogger().isDebugEnabled()) { |
| getLogger().debug("Got interrupted waiting for other pipeline to finish processing, retrying...",e); |
| } |
| return false; |
| } |
| if(getLogger().isDebugEnabled()) { |
| getLogger().debug("Other pipeline finished processing, retrying to get cached response."); |
| } |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * makes the lock (instantiates a new object and puts it into the store) |
| */ |
| protected boolean generateLock(Object key) { |
| boolean succeeded = true; |
| |
| if( transientStore != null && key != null ) { |
| String lockKey = PIPELOCK_PREFIX+key; |
| synchronized(transientStore) { |
| if(transientStore.containsKey(lockKey)) { |
| succeeded = false; |
| if(getLogger().isDebugEnabled()) { |
| getLogger().debug("Lock already present in the store!"); |
| } |
| } else { |
| Object lock = Thread.currentThread(); |
| try { |
| transientStore.store(lockKey, lock); |
| } catch (IOException e) { |
| if(getLogger().isDebugEnabled()) { |
| getLogger().debug("Could not put lock in the store!",e); |
| } |
| succeeded = false; |
| } |
| } |
| } |
| } |
| |
| return succeeded; |
| } |
| |
| /** |
| * releases the lock (notifies it and removes it from the store) |
| */ |
| protected boolean releaseLock(Object key) { |
| boolean succeeded = true; |
| |
| if( transientStore != null && key != null ) { |
| String lockKey = PIPELOCK_PREFIX+key; |
| Object lock = null; |
| synchronized(transientStore) { |
| if(!transientStore.containsKey(lockKey)) { |
| succeeded = false; |
| if(getLogger().isDebugEnabled()) { |
| getLogger().debug("Lock not present in the store!"); |
| } |
| } else { |
| try { |
| lock = transientStore.get(lockKey); |
| transientStore.remove(lockKey); |
| } catch (Exception e) { |
| if(getLogger().isDebugEnabled()) { |
| getLogger().debug("Could not get lock from the store!",e); |
| } |
| succeeded = false; |
| } |
| } |
| } |
| if(succeeded && lock != null) { |
| // become monitor owner |
| synchronized(lock) { |
| lock.notifyAll(); |
| } |
| } |
| } |
| |
| return succeeded; |
| } |
| |
| /** |
| * Process the given <code>Environment</code>, producing the output. |
| */ |
| protected boolean processXMLPipeline(Environment environment) |
| throws ProcessingException { |
| if (this.toCacheKey == null && this.cachedResponse == null) { |
| return super.processXMLPipeline(environment); |
| } |
| |
| if (this.cachedResponse != null && this.completeResponseIsCached) { |
| |
| // Allow for 304 (not modified) responses in dynamic content |
| if (checkIfModified(environment, this.cachedResponse.getLastModified())) { |
| return true; |
| } |
| |
| // Set mime-type |
| if (this.cachedResponse.getContentType() != null) { |
| environment.setContentType(this.cachedResponse.getContentType()); |
| } else { |
| setMimeTypeForSerializer(environment); |
| } |
| |
| // Write response out |
| try { |
| final OutputStream outputStream = environment.getOutputStream(0); |
| final byte[] content = this.cachedResponse.getResponse(); |
| if (content.length > 0) { |
| environment.setContentLength(content.length); |
| outputStream.write(content); |
| } |
| } catch (Exception e) { |
| handleException(e); |
| } |
| } else { |
| setMimeTypeForSerializer(environment); |
| if (getLogger().isDebugEnabled() && this.toCacheKey != null) { |
| getLogger().debug("processXMLPipeline: caching content for further" + |
| " requests of '" + environment.getURI() + |
| "' using key " + this.toCacheKey); |
| } |
| |
| generateLock(this.toCacheKey); |
| |
| try { |
| OutputStream os = null; |
| |
| if (this.cacheCompleteResponse && this.toCacheKey != null) { |
| os = new CachingOutputStream(environment.getOutputStream(this.outputBufferSize)); |
| } |
| |
| if (super.serializer != super.lastConsumer) { |
| if (os == null) { |
| os = environment.getOutputStream(this.outputBufferSize); |
| } |
| |
| // internal processing |
| if (this.xmlDeserializer != null) { |
| this.xmlDeserializer.deserialize(this.cachedResponse.getResponse()); |
| } else { |
| this.generator.generate(); |
| } |
| |
| } else { |
| if (this.serializer.shouldSetContentLength()) { |
| if (os == null) { |
| os = environment.getOutputStream(0); |
| } |
| |
| // Set the output stream |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| this.serializer.setOutputStream(baos); |
| |
| // Execute the pipeline |
| if (this.xmlDeserializer != null) { |
| this.xmlDeserializer.deserialize(this.cachedResponse.getResponse()); |
| } else { |
| this.generator.generate(); |
| } |
| |
| environment.setContentLength(baos.size()); |
| baos.writeTo(os); |
| } else { |
| if (os == null) { |
| os = environment.getOutputStream(this.outputBufferSize); |
| } |
| |
| // Set the output stream |
| this.serializer.setOutputStream(os); |
| |
| // Execute the pipeline |
| if (this.xmlDeserializer != null) { |
| this.xmlDeserializer.deserialize(this.cachedResponse.getResponse()); |
| } else { |
| this.generator.generate(); |
| } |
| } |
| } |
| |
| // |
| // Now that we have processed the pipeline, |
| // we do the actual caching |
| // |
| CachedResponse completeCachedResponse = cacheResults(environment,os); |
| |
| if (completeCachedResponse != null) { |
| //Dirty work-around for setting Last-Modified header as there is no appoporiate method |
| //org.apache.cocoon.environment.http.HttpEnvironment.isResponseModified will set it and the result of |
| //the actual check is neither meaningful nor important here |
| environment.isResponseModified(completeCachedResponse.getLastModified()); |
| } |
| |
| } catch (Exception e) { |
| handleException(e); |
| } finally { |
| releaseLock(this.toCacheKey); |
| } |
| |
| //Request has been succesfully processed, set approporiate status code |
| environment.setStatus(HttpServletResponse.SC_OK); |
| return true; |
| } |
| |
| return true; |
| } |
| |
| /** |
| * The components of the pipeline are checked if they are Cacheable. |
| */ |
| protected void generateCachingKey(Environment environment) |
| throws ProcessingException { |
| |
| this.toCacheKey = null; |
| |
| this.firstNotCacheableTransformerIndex = 0; |
| this.cacheCompleteResponse = false; |
| |
| // first step is to generate the key: |
| // All pipeline components starting with the generator |
| // are tested if they are either a CacheableProcessingComponent |
| // or Cacheable (deprecated). The returned keys are chained together |
| // to build a unique key of the request |
| |
| // is the generator cacheable? |
| Serializable key = null; |
| if (super.generator instanceof CacheableProcessingComponent) { |
| key = ((CacheableProcessingComponent)super.generator).getKey(); |
| } |
| |
| if (key != null) { |
| this.toCacheKey = new PipelineCacheKey(); |
| this.toCacheKey.addKey( |
| this.newComponentCacheKey( |
| ComponentCacheKey.ComponentType_Generator, |
| this.generatorRole, key)); |
| |
| // now testing transformers |
| final int transformerSize = super.transformers.size(); |
| boolean continueTest = true; |
| |
| while (this.firstNotCacheableTransformerIndex < transformerSize && continueTest) { |
| final Transformer trans = |
| (Transformer) super.transformers.get(this.firstNotCacheableTransformerIndex); |
| key = null; |
| if (trans instanceof CacheableProcessingComponent) { |
| key = ((CacheableProcessingComponent)trans).getKey(); |
| } |
| if (key != null) { |
| this.toCacheKey.addKey( |
| this.newComponentCacheKey( |
| ComponentCacheKey.ComponentType_Transformer, |
| (String)this.transformerRoles.get( |
| this.firstNotCacheableTransformerIndex), |
| key)); |
| |
| this.firstNotCacheableTransformerIndex++; |
| } else { |
| continueTest = false; |
| } |
| } |
| // all transformers are cacheable => pipeline is cacheable |
| // test serializer if this is not an internal request |
| if (this.firstNotCacheableTransformerIndex == transformerSize |
| && super.serializer == this.lastConsumer) { |
| |
| key = null; |
| if (super.serializer instanceof CacheableProcessingComponent) { |
| key = ((CacheableProcessingComponent)this.serializer).getKey(); |
| } |
| if (key != null) { |
| this.toCacheKey.addKey( |
| this.newComponentCacheKey( |
| ComponentCacheKey.ComponentType_Serializer, |
| this.serializerRole, |
| key)); |
| this.cacheCompleteResponse = true; |
| } |
| } |
| } |
| } |
| |
| /** |
| * Generate validity objects for the new response |
| */ |
| protected void setupValidities() throws ProcessingException { |
| |
| if (this.toCacheKey != null) { |
| // only update validity objects if we cannot use |
| // a cached response or when the cached response does |
| // cache less than now is cacheable |
| if (this.fromCacheKey == null |
| || this.fromCacheKey.size() < this.toCacheKey.size()) { |
| |
| this.toCacheSourceValidities = |
| new SourceValidity[this.toCacheKey.size()]; |
| |
| int len = this.toCacheSourceValidities.length; |
| int i = 0; |
| while (i < len) { |
| final SourceValidity validity = getValidityForInternalPipeline(i); |
| |
| if (validity == null) { |
| if (i > 0 |
| && (this.fromCacheKey == null |
| || i > this.fromCacheKey.size())) { |
| // shorten key |
| for (int m=i; m < this.toCacheSourceValidities.length; m++) { |
| this.toCacheKey.removeLastKey(); |
| if (!this.cacheCompleteResponse) { |
| this.firstNotCacheableTransformerIndex--; |
| } |
| this.cacheCompleteResponse = false; |
| } |
| SourceValidity[] copy = new SourceValidity[i]; |
| System.arraycopy(this.toCacheSourceValidities, 0, copy, 0, copy.length); |
| this.toCacheSourceValidities = copy; |
| len = this.toCacheSourceValidities.length; |
| } else { |
| // caching is not possible! |
| this.toCacheKey = null; |
| this.toCacheSourceValidities = null; |
| this.cacheCompleteResponse = false; |
| len = 0; |
| } |
| } else { |
| this.toCacheSourceValidities[i] = validity; |
| } |
| i++; |
| } |
| } else { |
| // we don't have to cache |
| this.toCacheKey = null; |
| this.cacheCompleteResponse = false; |
| } |
| } |
| } |
| |
| /** |
| * Calculate the key that can be used to get something from the cache, and |
| * handle expires properly. |
| */ |
| protected void validatePipeline(Environment environment) |
| throws ProcessingException { |
| this.completeResponseIsCached = this.cacheCompleteResponse; |
| this.fromCacheKey = this.toCacheKey.copy(); |
| this.firstProcessedTransformerIndex = this.firstNotCacheableTransformerIndex; |
| |
| boolean finished = false; |
| while (this.fromCacheKey != null && !finished) { |
| finished = true; |
| |
| final CachedResponse response = this.cache.get(this.fromCacheKey); |
| |
| // now test validity |
| if (response != null) { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Found cached response for '" + environment.getURI() + |
| "' using key: " + this.fromCacheKey); |
| } |
| |
| boolean responseIsValid = true; |
| boolean responseIsUsable = true; |
| |
| // See if we have an explicit "expires" setting. If so, |
| // and if it's still fresh, we're done. |
| Long responseExpires = response.getExpires(); |
| |
| if (responseExpires != null) { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Expires time found for " + environment.getURI()); |
| } |
| |
| if (responseExpires.longValue() > System.currentTimeMillis()) { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Expires time still fresh for " + environment.getURI() + |
| ", ignoring all other cache settings. This entry expires on "+ |
| new Date(responseExpires.longValue())); |
| } |
| this.cachedResponse = response; |
| return; |
| } else { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Expires time has expired for " + environment.getURI() + |
| ", regenerating content."); |
| } |
| |
| // If an expires parameter was provided, use it. If this parameter is not available |
| // it means that the sitemap was modified, and the old expires value is not valid |
| // anymore. |
| if (expires != 0) { |
| if (this.getLogger().isDebugEnabled()) |
| this.getLogger().debug("Refreshing expires informations"); |
| response.setExpires(new Long(expires + System.currentTimeMillis())); |
| } else { |
| if (this.getLogger().isDebugEnabled()) |
| this.getLogger().debug("No expires defined anymore for this object, setting it to no expires"); |
| response.setExpires(null); |
| } |
| } |
| } else { |
| // The response had no expires informations. See if it needs to be set (i.e. because the configuration has changed) |
| if (expires != 0) { |
| if (this.getLogger().isDebugEnabled()) |
| this.getLogger().debug("Setting a new expires object for this resource"); |
| response.setExpires(new Long(expires + System.currentTimeMillis())); |
| } |
| } |
| |
| SourceValidity[] fromCacheValidityObjects = response.getValidityObjects(); |
| |
| int i = 0; |
| while (responseIsValid && i < fromCacheValidityObjects.length) { |
| boolean isValid = false; |
| |
| // BH Check if validities[i] is null, may happen |
| // if exception was thrown due to malformed content |
| SourceValidity validity = fromCacheValidityObjects[i]; |
| int valid = validity == null ? SourceValidity.INVALID : validity.isValid(); |
| if (valid == SourceValidity.UNKNOWN) { |
| // Don't know if valid, make second test |
| validity = getValidityForInternalPipeline(i); |
| if (validity != null) { |
| valid = fromCacheValidityObjects[i].isValid(validity); |
| if (valid == SourceValidity.UNKNOWN) { |
| validity = null; |
| } else { |
| isValid = (valid == SourceValidity.VALID); |
| } |
| } |
| } else { |
| isValid = (valid == SourceValidity.VALID); |
| } |
| |
| if (!isValid) { |
| responseIsValid = false; |
| // update validity |
| if (validity == null) { |
| responseIsUsable = false; |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("validatePipeline: responseIsUsable is false, valid=" + |
| valid + " at index " + i); |
| } |
| } else { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("validatePipeline: responseIsValid is false due to " + |
| validity); |
| } |
| } |
| } else { |
| i++; |
| } |
| } |
| |
| if (responseIsValid) { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("validatePipeline: using valid cached content for '" + |
| environment.getURI() + "'."); |
| } |
| |
| // we are valid, ok that's it |
| this.cachedResponse = response; |
| this.toCacheSourceValidities = fromCacheValidityObjects; |
| } else { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("validatePipeline: cached content is invalid for '" + |
| environment.getURI() + "'."); |
| } |
| // we are not valid! |
| |
| if (!responseIsUsable) { |
| // we could not compare, because we got no |
| // validity object, so shorten pipeline key |
| if (i > 0) { |
| int deleteCount = fromCacheValidityObjects.length - i; |
| if (i > 0 && i <= firstNotCacheableTransformerIndex + 1) { |
| this.firstNotCacheableTransformerIndex = i-1; |
| } |
| for(int x=0; x < deleteCount; x++) { |
| this.toCacheKey.removeLastKey(); |
| } |
| finished = false; |
| } else { |
| this.toCacheKey = null; |
| } |
| this.cacheCompleteResponse = false; |
| } else { |
| // the entry is invalid, remove it |
| this.cache.remove(this.fromCacheKey); |
| } |
| |
| // try a shorter key |
| if (i > 0) { |
| this.fromCacheKey.removeLastKey(); |
| if (!this.completeResponseIsCached) { |
| this.firstProcessedTransformerIndex--; |
| } |
| } else { |
| this.fromCacheKey = null; |
| } |
| finished = false; |
| this.completeResponseIsCached = false; |
| } |
| } else { |
| |
| // check if there might be one being generated |
| if(!waitForLock(this.fromCacheKey)) { |
| finished = false; |
| continue; |
| } |
| |
| // no cached response found |
| if (this.getLogger().isDebugEnabled()) { |
| this.getLogger().debug( |
| "Cached response not found for '" + environment.getURI() + |
| "' using key: " + this.fromCacheKey |
| ); |
| } |
| |
| finished = setupFromCacheKey(); |
| this.completeResponseIsCached = false; |
| } |
| } |
| |
| } |
| |
| boolean setupFromCacheKey() { |
| // stop on longest key for smart caching |
| this.fromCacheKey = null; |
| return true; |
| } |
| |
| /** |
| * Setup the evenet pipeline. |
| * The components of the pipeline are checked if they are |
| * Cacheable. |
| */ |
| protected void setupPipeline(Environment environment) |
| throws ProcessingException { |
| super.setupPipeline(environment); |
| |
| // Generate the key to fill the cache |
| generateCachingKey(environment); |
| |
| // Test the cache for a valid response |
| if (this.toCacheKey != null) { |
| validatePipeline(environment); |
| } |
| |
| setupValidities(); |
| } |
| |
| /** |
| * Connect the pipeline. |
| */ |
| protected void connectPipeline(Environment environment) |
| throws ProcessingException { |
| if (this.toCacheKey == null && this.cachedResponse == null) { |
| super.connectPipeline(environment); |
| return; |
| } else if (this.completeResponseIsCached) { |
| // do nothing |
| return; |
| } else { |
| this.connectCachingPipeline(environment); |
| } |
| } |
| |
| /** Process the pipeline using a reader. |
| * @throws ProcessingException if an error occurs |
| */ |
| protected boolean processReader(Environment environment) |
| throws ProcessingException { |
| try { |
| boolean usedCache = false; |
| OutputStream outputStream = null; |
| SourceValidity readerValidity = null; |
| PipelineCacheKey pcKey = null; |
| |
| // test if reader is cacheable |
| Serializable readerKey = null; |
| if (super.reader instanceof CacheableProcessingComponent) { |
| readerKey = ((CacheableProcessingComponent)super.reader).getKey(); |
| } |
| |
| boolean finished = false; |
| |
| if (readerKey != null) { |
| // response is cacheable, build the key |
| pcKey = new PipelineCacheKey(); |
| pcKey.addKey(new ComponentCacheKey(ComponentCacheKey.ComponentType_Reader, |
| this.readerRole, |
| readerKey) |
| ); |
| |
| while(!finished) { |
| finished = true; |
| // now we have the key to get the cached object |
| CachedResponse cachedObject = this.cache.get(pcKey); |
| if (cachedObject != null) { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Found cached response for '" + |
| environment.getURI() + "' using key: " + pcKey); |
| } |
| |
| SourceValidity[] validities = cachedObject.getValidityObjects(); |
| if (validities == null || validities.length != 1) { |
| // to avoid getting here again and again, we delete it |
| this.cache.remove(pcKey); |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Cached response for '" + environment.getURI() + |
| "' using key: " + pcKey + " is invalid."); |
| } |
| this.cachedResponse = null; |
| } else { |
| SourceValidity cachedValidity = validities[0]; |
| boolean isValid = false; |
| int valid = cachedValidity.isValid(); |
| if (valid == SourceValidity.UNKNOWN) { |
| // get reader validity and compare |
| readerValidity = ((CacheableProcessingComponent) super.reader).getValidity(); |
| if (readerValidity != null) { |
| valid = cachedValidity.isValid(readerValidity); |
| if (valid == SourceValidity.UNKNOWN) { |
| readerValidity = null; |
| } else { |
| isValid = (valid == SourceValidity.VALID); |
| } |
| } |
| } else { |
| isValid = (valid == SourceValidity.VALID); |
| } |
| |
| if (isValid) { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("processReader: using valid cached content for '" + |
| environment.getURI() + "'."); |
| } |
| byte[] response = cachedObject.getResponse(); |
| if (response.length > 0) { |
| usedCache = true; |
| if (cachedObject.getContentType() != null) { |
| environment.setContentType(cachedObject.getContentType()); |
| } else { |
| setMimeTypeForReader(environment); |
| } |
| outputStream = environment.getOutputStream(0); |
| environment.setContentLength(response.length); |
| outputStream.write(response); |
| } |
| } else { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("processReader: cached content is invalid for '" + |
| environment.getURI() + "'."); |
| } |
| // remove invalid cached object |
| this.cache.remove(pcKey); |
| } |
| } |
| } else { |
| // check if something is being generated right now |
| if(!waitForLock(pcKey)) { |
| finished = false; |
| continue; |
| } |
| } |
| } |
| } |
| |
| if (!usedCache) { |
| // make sure lock will be released |
| try { |
| if (pcKey != null) { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("processReader: caching content for further requests of '" + |
| environment.getURI() + "'."); |
| } |
| generateLock(pcKey); |
| |
| if (readerValidity == null) { |
| readerValidity = ((CacheableProcessingComponent)super.reader).getValidity(); |
| } |
| |
| if (readerValidity != null) { |
| outputStream = environment.getOutputStream(this.outputBufferSize); |
| outputStream = new CachingOutputStream(outputStream); |
| } |
| } |
| |
| setMimeTypeForReader(environment); |
| if (this.reader.shouldSetContentLength()) { |
| ByteArrayOutputStream os = new ByteArrayOutputStream(); |
| this.reader.setOutputStream(os); |
| this.reader.generate(); |
| environment.setContentLength(os.size()); |
| if (outputStream == null) { |
| outputStream = environment.getOutputStream(0); |
| } |
| os.writeTo(outputStream); |
| } else { |
| if (outputStream == null) { |
| outputStream = environment.getOutputStream(this.outputBufferSize); |
| } |
| this.reader.setOutputStream(outputStream); |
| this.reader.generate(); |
| } |
| |
| // store the response |
| if (pcKey != null && readerValidity != null) { |
| final CachedResponse res = new CachedResponse(new SourceValidity[] {readerValidity}, |
| ((CachingOutputStream)outputStream).getContent()); |
| res.setContentType(environment.getContentType()); |
| this.cache.store(pcKey, res); |
| } |
| |
| } finally { |
| if (pcKey != null) { |
| releaseLock(pcKey); |
| } |
| } |
| |
| } |
| } catch (Exception e) { |
| handleException(e); |
| } |
| |
| //Request has been succesfully processed, set approporiate status code |
| environment.setStatus(HttpServletResponse.SC_OK); |
| return true; |
| } |
| |
| |
| /** |
| * Return valid validity objects for the event pipeline. |
| * |
| * If the event pipeline (the complete pipeline without the |
| * serializer) is cacheable and valid, return all validity objects. |
| * |
| * Otherwise, return <code>null</code>. |
| */ |
| public SourceValidity getValidityForEventPipeline() { |
| if (isInternalError()) { |
| return null; |
| } |
| |
| if (this.cachedResponse != null) { |
| if (!this.cacheCompleteResponse && |
| this.firstNotCacheableTransformerIndex < super.transformers.size()) { |
| // Cache contains only partial pipeline. |
| return null; |
| } |
| |
| if (this.toCacheSourceValidities != null) { |
| // This means that the pipeline is valid based on the validities |
| // of the individual components |
| final AggregatedValidity validity = new AggregatedValidity(); |
| for (int i=0; i < this.toCacheSourceValidities.length; i++) { |
| validity.add(this.toCacheSourceValidities[i]); |
| } |
| |
| return validity; |
| } |
| |
| // This means that the pipeline is valid because it has not yet expired |
| return NOPValidity.SHARED_INSTANCE; |
| } else { |
| int vals = 0; |
| |
| if (null != this.toCacheKey |
| && !this.cacheCompleteResponse |
| && this.firstNotCacheableTransformerIndex == super.transformers.size()) { |
| vals = this.toCacheKey.size(); |
| } else if (null != this.fromCacheKey |
| && !this.completeResponseIsCached |
| && this.firstProcessedTransformerIndex == super.transformers.size()) { |
| vals = this.fromCacheKey.size(); |
| } |
| |
| if (vals > 0) { |
| final AggregatedValidity validity = new AggregatedValidity(); |
| for (int i = 0; i < vals; i++) { |
| validity.add(getValidityForInternalPipeline(i)); |
| } |
| |
| return validity; |
| } |
| |
| return null; |
| } |
| } |
| |
| /* (non-Javadoc) |
| * @see org.apache.cocoon.components.pipeline.ProcessingPipeline#getKeyForEventPipeline() |
| */ |
| public String getKeyForEventPipeline() { |
| if (isInternalError()) { |
| return null; |
| } |
| |
| if (null != this.toCacheKey |
| && !this.cacheCompleteResponse |
| && this.firstNotCacheableTransformerIndex == super.transformers.size()) { |
| return String.valueOf(HashUtil.hash(this.toCacheKey.toString())); |
| } |
| if (null != this.fromCacheKey |
| && !this.completeResponseIsCached |
| && this.firstProcessedTransformerIndex == super.transformers.size()) { |
| return String.valueOf(HashUtil.hash(this.fromCacheKey.toString())); |
| } |
| |
| return null; |
| } |
| |
| SourceValidity getValidityForInternalPipeline(int index) { |
| final SourceValidity validity; |
| |
| // if debugging try to tell why something is not cacheable |
| final boolean debug = this.getLogger().isDebugEnabled(); |
| String msg = null; |
| if(debug) msg = "getValidityForInternalPipeline(" + index + "): "; |
| |
| if (index == 0) { |
| // test generator |
| validity = ((CacheableProcessingComponent)super.generator).getValidity(); |
| if(debug) msg += "generator: using getValidity"; |
| } else if (index <= firstNotCacheableTransformerIndex) { |
| // test transformer |
| final Transformer trans = (Transformer)super.transformers.get(index-1); |
| validity = ((CacheableProcessingComponent)trans).getValidity(); |
| if(debug) msg += "transformer: using getValidity"; |
| } else { |
| // test serializer |
| validity = ((CacheableProcessingComponent)super.serializer).getValidity(); |
| if(debug) msg += "serializer: using getValidity"; |
| } |
| |
| if(debug) { |
| msg += ", validity==" + validity; |
| this.getLogger().debug(msg); |
| } |
| return validity; |
| } |
| |
| /** |
| * Recyclable Interface |
| */ |
| public void recycle() { |
| this.generatorRole = null; |
| this.transformerRoles.clear(); |
| this.serializerRole = null; |
| this.readerRole = null; |
| |
| this.fromCacheKey = null; |
| this.cachedResponse = null; |
| |
| this.toCacheKey = null; |
| this.toCacheSourceValidities = null; |
| |
| super.recycle(); |
| } |
| } |
| |
| final class DeferredPipelineValidity implements DeferredValidity { |
| |
| private final AbstractCachingProcessingPipeline pipeline; |
| private final int index; |
| |
| public DeferredPipelineValidity(AbstractCachingProcessingPipeline pipeline, int index) { |
| this.pipeline = pipeline; |
| this.index = index; |
| } |
| |
| /** |
| * @see org.apache.excalibur.source.impl.validity.DeferredValidity#getValidity() |
| */ |
| public SourceValidity getValidity() { |
| return pipeline.getValidityForInternalPipeline(this.index); |
| } |
| } |
