Introduce osgDB::FileCache, and updated osgfilecache and DatabasePager to use it.

2008-10-20 16:24:57 +00:00
parent 10186190f6
commit 24eb2f6c43
9 changed files with 252 additions and 115 deletions
--- a/src/osgDB/FileCache.cpp
+++ b/src/osgDB/FileCache.cpp
@@ -0,0 +1,80 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * OpenSceneGraph Public License for more details.
+*/
+
+#include <osgDB/FileCache>
+#include <osgDB/FileUtils>
+#include <osgDB/FileNameUtils>
+#include <osgDB/ReadFile>
+#include <osgDB/WriteFile>
+
+using namespace osgDB;
+
+FileCache::FileCache(const std::string& path):
+    _fileCachePath(path)
+{
+    osg::notify(osg::INFO)<<"Constructed FileCache : "<<path<<std::endl;
+}
+
+FileCache::~FileCache()
+{
+    osg::notify(osg::INFO)<<"Destructed FileCache "<<std::endl;
+}
+
+std::string FileCache::createCacheFileName(const std::string& originalFileName) const
+{
+    std::string cacheFileName = _fileCachePath + "/" + 
+                                osgDB::getServerAddress(originalFileName) + "/" + 
+                                osgDB::getServerFileName(originalFileName);
+                                
+    osg::notify(osg::INFO)<<"FileCache::createCacheFileName("<<originalFileName<<") = "<<cacheFileName<<std::endl;
+    
+    return cacheFileName;
+}
+
+bool FileCache::existsInCache(const std::string& originalFileName) const
+{
+    return osgDB::fileExists(createCacheFileName(originalFileName));
+}
+
+ReaderWriter::ReadResult FileCache::readNode(const std::string& originalFileName, const osgDB::ReaderWriter::Options* options, bool buildKdTreeIfRequired) const
+{
+    std::string cacheFileName = createCacheFileName(originalFileName);
+    if (!cacheFileName.empty() && osgDB::fileExists(cacheFileName))
+    {
+        osg::notify(osg::INFO)<<"FileCache::readNodeFromCache("<<originalFileName<<") as "<<cacheFileName<<std::endl;
+        return osgDB::Registry::instance()->readNode(cacheFileName, options, buildKdTreeIfRequired);
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+ReaderWriter::WriteResult FileCache::writeNode(const osg::Node& node, const std::string& originalFileName, const osgDB::ReaderWriter::Options* options) const
+{
+    std::string cacheFileName = createCacheFileName(originalFileName);
+    if (!cacheFileName.empty())
+    {
+        std::string path = osgDB::getFilePath(cacheFileName);
+
+        if (!osgDB::fileExists(path) && !osgDB::makeDirectory(path))
+        {
+            osg::notify(osg::NOTICE)<<"Could not create cache directory: "<<path<<std::endl;
+            return ReaderWriter::WriteResult::ERROR_IN_WRITING_FILE;
+        }
+
+        osg::notify(osg::INFO)<<"FileCache::writeNodeToCache("<<originalFileName<<") as "<<cacheFileName<<std::endl;
+        return osgDB::Registry::instance()->writeNode(node, cacheFileName, options);
+    }
+    return ReaderWriter::WriteResult::FILE_NOT_HANDLED;
+}