mirror of
https://github.com/Alfresco/alfresco-community-repo.git
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6afb44e712
125606 rmunteanu: Merged 5.1.1 (5.1.1) to 5.1.N (5.1.2)
125515 slanglois: MNT-16155 Update source headers - add new Copyrights for Java and JSP source files + automatic check in the build
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/DEV/5.2.N/root@125788 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
110 lines
3.9 KiB
Java
110 lines
3.9 KiB
Java
/*
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* #%L
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* Alfresco Repository
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* %%
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* Copyright (C) 2005 - 2016 Alfresco Software Limited
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* %%
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* This file is part of the Alfresco software.
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* If the software was purchased under a paid Alfresco license, the terms of
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* the paid license agreement will prevail. Otherwise, the software is
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* provided under the following open source license terms:
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*
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* Alfresco is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Alfresco is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
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* #L%
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*/
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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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