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8674e2bfc8
125603 rmunteanu: Merged 5.1.1 (5.1.1) to 5.1.N (5.1.2)
125484 slanglois: MNT-16155 Update source headers - remove old Copyrights from Java and JSP dource files
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/DEV/5.2.N/root@125781 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
85 lines
2.9 KiB
Java
85 lines
2.9 KiB
Java
package org.alfresco.repo.content.caching;
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import java.io.File;
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import org.alfresco.service.cmr.repository.ContentReader;
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import org.alfresco.service.cmr.repository.ContentWriter;
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/**
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* A cache designed to operate on content and split between memory and disk.
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* The binary content data itself is stored on disk but the references to
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* those files are stored in memory.
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*
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* @author Matt Ward
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*/
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public interface ContentCache
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{
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/**
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* Returns the location where cache files will be written (cacheRoot) - implementation
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* dependant and may be null.
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*
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* @return cacheRoot
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*/
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public File getCacheRoot();
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/**
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* Check to see if the content - specified by URL - exists in the cache.
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* <p>
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* Note that just because the in-memory cache has a record of the content item having been placed
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* into the cache, it does not mean that the disk item is guaranteed to be there. The temp file
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* clean-up process, for example, may have removed it.
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* <p>
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* @param contentUrl String
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* @return true if the URL exists in the in-memory cache. It <em>may</em> therefore be cached on disk.
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*/
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boolean contains(String contentUrl);
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/**
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* Retrieve a ContentReader for the cached content specified by URL.
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*
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* @param contentUrl String
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* @return ContentReader
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* @throws org.alfresco.repo.content.caching.CacheMissException
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* If the cache does not contain the specified content.
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*/
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ContentReader getReader(String contentUrl);
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/**
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* Put an item into cache - this will populate both a disk file (with content) and
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* the in-memory lookup table (with the URL and cache file location).
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*
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* Empty content will NOT be cached - in which case false is returned.
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*
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* @param contentUrl String
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* @param reader ContentReader
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* @return true if the content was cached, false otherwise.
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*/
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boolean put(String contentUrl, ContentReader reader);
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/**
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* Remove a cached item from the in-memory lookup table. Implementation should not remove
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* the actual cached content (file) - this should be left to the clean-up process or can
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* be deleted with {@link #deleteFile(String)}.
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*
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* @param contentUrl String
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*/
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void remove(String contentUrl);
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/**
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* Deletes the cached content file for the specified URL. To remove the item from the
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* lookup table also, use {@link #remove(String)} after calling this method.
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*
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* @param url String
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*/
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void deleteFile(String url);
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/**
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* Retrieve a ContentWriter to write content to a cache file. Upon closing the stream
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* a listener will add the new content file to the in-memory lookup table.
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*
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* @param url url
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* @return ContentWriter
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*/
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ContentWriter getWriter(String url);
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}
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