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git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2005 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Derek Hulley
384
source/java/org/alfresco/repo/content/RoutingContentService.java
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384
source/java/org/alfresco/repo/content/RoutingContentService.java
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/*
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* Copyright (C) 2005 Alfresco, Inc.
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*
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* Licensed under the Mozilla Public License version 1.1
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* with a permitted attribution clause. You may obtain a
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* copy of the License at
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*
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* http://www.alfresco.org/legal/license.txt
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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* either express or implied. See the License for the specific
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* language governing permissions and limitations under the
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* License.
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*/
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package org.alfresco.repo.content;
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import java.io.Serializable;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Set;
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import org.alfresco.error.AlfrescoRuntimeException;
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import org.alfresco.repo.content.ContentServicePolicies.OnContentUpdatePolicy;
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import org.alfresco.repo.content.filestore.FileContentStore;
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import org.alfresco.repo.content.transform.ContentTransformer;
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import org.alfresco.repo.content.transform.ContentTransformerRegistry;
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import org.alfresco.repo.policy.ClassPolicyDelegate;
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import org.alfresco.repo.policy.JavaBehaviour;
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import org.alfresco.repo.policy.PolicyComponent;
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import org.alfresco.service.cmr.dictionary.DataTypeDefinition;
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import org.alfresco.service.cmr.dictionary.DictionaryService;
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import org.alfresco.service.cmr.dictionary.InvalidTypeException;
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import org.alfresco.service.cmr.dictionary.PropertyDefinition;
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import org.alfresco.service.cmr.repository.ContentData;
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import org.alfresco.service.cmr.repository.ContentIOException;
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import org.alfresco.service.cmr.repository.ContentReader;
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import org.alfresco.service.cmr.repository.ContentService;
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import org.alfresco.service.cmr.repository.ContentStreamListener;
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import org.alfresco.service.cmr.repository.ContentWriter;
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import org.alfresco.service.cmr.repository.NoTransformerException;
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import org.alfresco.service.cmr.repository.NodeRef;
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import org.alfresco.service.cmr.repository.NodeService;
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import org.alfresco.service.namespace.NamespaceService;
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import org.alfresco.service.namespace.QName;
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import org.alfresco.service.transaction.TransactionService;
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import org.alfresco.util.EqualsHelper;
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import org.alfresco.util.TempFileProvider;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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/**
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* A content service that determines at runtime the store that the
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* content associated with a node should be routed to.
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*
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* @author Derek Hulley
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*/
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public class RoutingContentService implements ContentService
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{
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private static Log logger = LogFactory.getLog(RoutingContentService.class);
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private TransactionService transactionService;
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private DictionaryService dictionaryService;
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private NodeService nodeService;
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/** a registry of all available content transformers */
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private ContentTransformerRegistry transformerRegistry;
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/** TEMPORARY until we have a map to choose from at runtime */
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private ContentStore store;
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/** the store for all temporarily created content */
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private ContentStore tempStore;
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/**
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* The policy component
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*/
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private PolicyComponent policyComponent;
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/**
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* The onContentService policy delegate
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*/
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ClassPolicyDelegate<ContentServicePolicies.OnContentUpdatePolicy> onContentUpdateDelegate;
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/**
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* Default constructor sets up a temporary store
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*/
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public RoutingContentService()
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{
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this.tempStore = new FileContentStore(TempFileProvider.getTempDir().getAbsolutePath());
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}
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public void setTransactionService(TransactionService transactionService)
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{
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this.transactionService = transactionService;
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}
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public void setDictionaryService(DictionaryService dictionaryService)
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{
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this.dictionaryService = dictionaryService;
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}
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public void setNodeService(NodeService nodeService)
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{
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this.nodeService = nodeService;
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}
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public void setTransformerRegistry(ContentTransformerRegistry transformerRegistry)
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{
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this.transformerRegistry = transformerRegistry;
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}
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public void setStore(ContentStore store)
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{
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this.store = store;
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}
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public void setPolicyComponent(PolicyComponent policyComponent)
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{
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this.policyComponent = policyComponent;
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}
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/**
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* Service initialise
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*/
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public void init()
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{
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// Bind on update properties behaviour
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this.policyComponent.bindClassBehaviour(
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QName.createQName(NamespaceService.ALFRESCO_URI, "onUpdateProperties"),
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this,
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new JavaBehaviour(this, "onUpdateProperties"));
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// Register on content update policy
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this.onContentUpdateDelegate = this.policyComponent.registerClassPolicy(OnContentUpdatePolicy.class);
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}
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/**
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* Update properties policy behaviour
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*
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* @param nodeRef the node reference
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* @param before the before values of the properties
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* @param after the after values of the properties
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*/
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public void onUpdateProperties(
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NodeRef nodeRef,
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Map<QName, Serializable> before,
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Map<QName, Serializable> after)
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{
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boolean fire = false;
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// check if any of the content properties have changed
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for (QName propertyQName : after.keySet())
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{
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// is this a content property?
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PropertyDefinition propertyDef = dictionaryService.getProperty(propertyQName);
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if (propertyDef == null)
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{
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// the property is not recognised
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continue;
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}
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if (!propertyDef.getDataType().getName().equals(DataTypeDefinition.CONTENT))
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{
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// not a content type
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continue;
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}
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try
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{
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ContentData beforeValue = (ContentData) before.get(propertyQName);
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ContentData afterValue = (ContentData) after.get(propertyQName);
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if (afterValue != null && afterValue.getContentUrl() == null)
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{
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// no URL - ignore
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}
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else if (!EqualsHelper.nullSafeEquals(beforeValue, afterValue))
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{
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// the content changed
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// at the moment, we are only interested in this one change
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fire = true;
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break;
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}
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}
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catch (ClassCastException e)
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{
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// properties don't conform to model
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continue;
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}
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}
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// fire?
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if (fire)
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{
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// Fire the content update policy
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Set<QName> types = new HashSet<QName>(this.nodeService.getAspects(nodeRef));
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types.add(this.nodeService.getType(nodeRef));
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OnContentUpdatePolicy policy = this.onContentUpdateDelegate.get(types);
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policy.onContentUpdate(nodeRef);
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}
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}
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public ContentReader getReader(NodeRef nodeRef, QName propertyQName)
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{
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// ensure that the node property is of type content
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PropertyDefinition contentPropDef = dictionaryService.getProperty(propertyQName);
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if (contentPropDef == null || !contentPropDef.getDataType().getName().equals(DataTypeDefinition.CONTENT))
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{
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throw new InvalidTypeException("The node property must be of type content: \n" +
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" node: " + nodeRef + "\n" +
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" property name: " + propertyQName + "\n" +
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" property type: " + ((contentPropDef == null) ? "unknown" : contentPropDef.getDataType()),
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propertyQName);
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}
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// get the content property
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ContentData contentData = (ContentData) nodeService.getProperty(nodeRef, propertyQName);
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// check that the URL is available
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if (contentData == null || contentData.getContentUrl() == null)
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{
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// there is no URL - the interface specifies that this is not an error condition
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return null;
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}
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String contentUrl = contentData.getContentUrl();
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// TODO: Choose the store to read from at runtime
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ContentReader reader = store.getReader(contentUrl);
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// set extra data on the reader
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reader.setMimetype(contentData.getMimetype());
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reader.setEncoding(contentData.getEncoding());
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// we don't listen for anything
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// result may be null - but interface contract says we may return null
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return reader;
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}
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public ContentWriter getWriter(NodeRef nodeRef, QName propertyQName, boolean update)
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{
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// check for an existing URL - the get of the reader will perform type checking
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ContentReader existingContentReader = getReader(nodeRef, propertyQName);
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// TODO: Choose the store to write to at runtime
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// get the content using the (potentially) existing content - the new content
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// can be wherever the store decides.
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ContentWriter writer = store.getWriter(existingContentReader, null);
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// set extra data on the reader if the property is pre-existing
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ContentData contentData = (ContentData) nodeService.getProperty(nodeRef, propertyQName);
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if (contentData != null)
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{
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writer.setMimetype(contentData.getMimetype());
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writer.setEncoding(contentData.getEncoding());
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}
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// attach a listener if required
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if (update)
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{
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// need a listener to update the node when the stream closes
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WriteStreamListener listener = new WriteStreamListener(nodeService, nodeRef, propertyQName, writer);
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writer.addListener(listener);
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writer.setTransactionService(transactionService);
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}
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// give back to the client
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return writer;
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}
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/**
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* @return Returns a writer to an anonymous location
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*/
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public ContentWriter getTempWriter()
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{
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// there is no existing content and we don't specify the location of the new content
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return tempStore.getWriter(null, null);
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}
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/**
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* @see org.alfresco.repo.content.transform.ContentTransformerRegistry
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* @see org.alfresco.repo.content.transform.ContentTransformer
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*/
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public void transform(ContentReader reader, ContentWriter writer)
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throws NoTransformerException, ContentIOException
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{
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// check that source and target mimetypes are available
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String sourceMimetype = reader.getMimetype();
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if (sourceMimetype == null)
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{
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throw new AlfrescoRuntimeException("The content reader mimetype must be set: " + reader);
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}
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String targetMimetype = writer.getMimetype();
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if (targetMimetype == null)
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{
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throw new AlfrescoRuntimeException("The content writer mimetype must be set: " + writer);
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}
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// look for a transformer
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ContentTransformer transformer = transformerRegistry.getTransformer(sourceMimetype, targetMimetype);
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if (transformer == null)
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{
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throw new NoTransformerException(sourceMimetype, targetMimetype);
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}
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// we have a transformer, so do it
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transformer.transform(reader, writer);
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// done
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}
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/**
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* @see org.alfresco.repo.content.transform.ContentTransformerRegistry
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* @see org.alfresco.repo.content.transform.ContentTransformer
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*/
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public boolean isTransformable(ContentReader reader, ContentWriter writer)
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{
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// check that source and target mimetypes are available
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String sourceMimetype = reader.getMimetype();
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if (sourceMimetype == null)
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{
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throw new AlfrescoRuntimeException("The content reader mimetype must be set: " + reader);
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}
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String targetMimetype = writer.getMimetype();
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if (targetMimetype == null)
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{
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throw new AlfrescoRuntimeException("The content writer mimetype must be set: " + writer);
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}
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// look for a transformer
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ContentTransformer transformer = transformerRegistry.getTransformer(sourceMimetype, targetMimetype);
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return (transformer != null);
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}
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/**
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* Ensures that, upon closure of the output stream, the node is updated with
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* the latest URL of the content to which it refers.
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* <p>
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* The listener close operation does not need a transaction as the
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* <code>ContentWriter</code> takes care of that.
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*
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* @author Derek Hulley
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*/
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private static class WriteStreamListener implements ContentStreamListener
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{
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private NodeService nodeService;
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private NodeRef nodeRef;
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private QName propertyQName;
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private ContentWriter writer;
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public WriteStreamListener(
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NodeService nodeService,
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NodeRef nodeRef,
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QName propertyQName,
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ContentWriter writer)
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{
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this.nodeService = nodeService;
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this.nodeRef = nodeRef;
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this.propertyQName = propertyQName;
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this.writer = writer;
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}
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public void contentStreamClosed() throws ContentIOException
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{
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try
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{
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// set the full content property
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ContentData contentData = writer.getContentData();
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nodeService.setProperty(
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nodeRef,
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propertyQName,
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contentData);
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// done
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if (logger.isDebugEnabled())
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{
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logger.debug("Stream listener updated node: \n" +
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" node: " + nodeRef + "\n" +
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" property: " + propertyQName + "\n" +
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" value: " + contentData);
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}
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}
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catch (Throwable e)
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{
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throw new ContentIOException("Failed to set content property on stream closure: \n" +
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" node: " + nodeRef + "\n" +
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" property: " + propertyQName + "\n" +
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" writer: " + writer,
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e);
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}
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}
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}
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}
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