store cache rawhash and rawsize for unstructured cache values (#234)

* refactored MemoryCacheBucket to allow for storing RawHash/RawSize.
* remove redundant conversions in AccessTime
* reduce max count for memory cache bucket to 32-bit value
* refactored DiskCacheBucket to allow for storing RawHash/RawSize.
* Use CompressedBuffer::ValidateCompressedHeader when applicable
* Make sure we rewrite the snapshot if we read an legacy existing index/log
* changelog

1 files changed, 10 insertions, 8 deletions

diff --git a/zenstore/include/zenstore/caslog.h b/zenstore/include/zenstore/caslog.h
index 1aeb50d05..d8c3f22f3 100644
--- a/zenstore/include/zenstore/caslog.h
+++ b/zenstore/include/zenstore/caslog.h
@@ -20,13 +20,14 @@ public:
 		kTruncate
 	};
 
-	void	 Open(std::filesystem::path FileName, size_t RecordSize, Mode Mode);
-	void	 Append(const void* DataPointer, uint64_t DataSize);
-	void	 Replay(std::function<void(const void*)>&& Handler, uint64_t SkipEntryCount);
-	void	 Flush();
-	void	 Close();
-	uint64_t GetLogSize();
-	uint64_t GetLogCount();
+	static bool IsValid(std::filesystem::path FileName, size_t RecordSize);
+	void		Open(std::filesystem::path FileName, size_t RecordSize, Mode Mode);
+	void		Append(const void* DataPointer, uint64_t DataSize);
+	void		Replay(std::function<void(const void*)>&& Handler, uint64_t SkipEntryCount);
+	void		Flush();
+	void		Close();
+	uint64_t	GetLogSize();
+	uint64_t	GetLogCount();
 
 private:
 	struct FileHeader
@@ -59,7 +60,8 @@ template<typename T>
 class TCasLogFile : public CasLogFile
 {
 public:
-	void Open(std::filesystem::path FileName, Mode Mode) { CasLogFile::Open(FileName, sizeof(T), Mode); }
+	static bool IsValid(std::filesystem::path FileName) { return CasLogFile::IsValid(FileName, sizeof(T)); }
+	void		Open(std::filesystem::path FileName, Mode Mode) { CasLogFile::Open(FileName, sizeof(T), Mode); }
 
 	// This should be called before the Replay() is called to do some basic sanity checking
 	bool Initialize() { return true; }