the begginning

primitives/blockcache/filebuffer.h

@@ -0,0 +1,151 @@
+/* Copyright (C) 2014 InfiniDB, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; version 2 of
+   the License.
+
+   This program 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
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA. */
+
+/***************************************************************************
+ *
+ *   $Id: filebuffer.h 2035 2013-01-21 14:12:19Z rdempsey $
+ *
+ *   jrodriguez@calpont.com   *
+ *                                                                         *
+***************************************************************************/
+
+#ifndef FILEBUFFER_H
+#define FILEBUFFER_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string>
+#include <stdexcept>
+#include <stdint.h>
+#include <time.h>
+#include "brmtypes.h"
+#include <list>
+#include <vector>
+#include "blocksize.h"
+
+/**
+	@author Jason Rodriguez <jrodriguez@calpont.com>
+*/
+
+
+/**
+ * @brief represents a disk blockrequest
+ **/
+namespace dbbc {
+
+typedef struct FBData{
+	BRM::LBID_t lbid;
+	BRM::VER_t ver;
+	uint8_t hits;
+} FBData_t;
+
+//@bug 669 Change to list for least recently used cache 
+typedef std::list<FBData_t> filebuffer_list_t;
+typedef std::list<FBData_t>::iterator filebuffer_list_iter_t;
+
+class FileBuffer {
+
+	public:
+	
+	FileBuffer();
+	/**
+	 * @brief copy ctor
+	 **/
+	FileBuffer(const FileBuffer& fb);
+
+	/**
+	 * @brief the disk block from lbid@ver, and a data block len bytes long
+	 **/
+	FileBuffer(const BRM::LBID_t lbid, const BRM::VER_t ver, const uint8_t* data, const uint32_t len);
+
+	/**
+	 * @brief disk block lbid@ver and empty data
+	 **/
+	FileBuffer(const BRM::LBID_t lbid, const BRM::VER_t ver);
+
+	/**
+	 * @brief class dtor
+	 **/
+    ~FileBuffer();
+
+	/**
+	 * @brief set the data value of this block to d have len bytestream
+	 **/
+	void setData(const uint8_t* d, const int len);
+	void setData(const uint8_t *d);  // assumes len = 8192
+
+	/**
+	 * @brief retrieve the data in byte* format from this data block
+	 **/
+	inline const uint8_t* getData() const {return fByteData;}
+	inline uint8_t* getData() {return fByteData;}
+
+	inline const uint32_t datLen() const {return fDataLen;}
+
+	/**
+	 * @brief assignment operator
+	 **/
+	FileBuffer& operator= (const FileBuffer& rhs);
+
+	/**
+	 * @brief equality operator is based on lbid@ver
+	 **/
+	inline bool operator==(const FileBuffer& rhs) const {
+		return (fLbid == rhs.fLbid && fVerid == rhs.fVerid);
+	}
+
+	/**
+	 * @brief inequality operator
+	 **/
+	inline bool operator!=(const FileBuffer& rhs) const {
+		return (!(fLbid == rhs.fLbid && fVerid == rhs.fVerid));
+	}
+
+	FileBuffer* thisPtr() {return this;}
+	/**
+	 * @brief return the lbid value of disk bloc
+	 **/
+	inline const BRM::LBID_t Lbid() const {return fLbid;}
+	inline void Lbid(const BRM::LBID_t l) {fLbid=l;}
+
+	/**
+	 * @brief return the version of this disk block. ignored for range retrievals
+	 **/
+	inline const BRM::VER_t Verid() const {return fVerid;}
+	inline void Verid(BRM::VER_t v) {fVerid=v;}
+
+	/**
+	 * @brief return the number of bytes in this disk blockrequest
+	 **/
+
+	inline void listLoc(const filebuffer_list_iter_t& loc) {fListLoc = loc;}
+
+	inline const filebuffer_list_iter_t& listLoc() const {return fListLoc;}
+
+private:
+
+	uint8_t fByteData[BLOCK_SIZE];
+	uint32_t fDataLen;
+	BRM::LBID_t fLbid;
+	BRM::VER_t fVerid;
+	filebuffer_list_iter_t fListLoc;
+};
+
+typedef std::vector<FileBuffer> FileBufferPool_t;
+
+}
+#endif