00001 /* 00002 * BlockManager.h : part of the Mace toolkit for building distributed systems 00003 * 00004 * Copyright (c) 2007, Charles Killian, Dejan Kostic, Ryan Braud, James W. Anderson, John Fisher-Ogden, Calvin Hubble, Duy Nguyen, Justin Burke, David Oppenheimer, Amin Vahdat, Adolfo Rodriguez, Sooraj Bhat 00005 * All rights reserved. 00006 * 00007 * Redistribution and use in source and binary forms, with or without 00008 * modification, are permitted provided that the following conditions are met: 00009 * 00010 * * Redistributions of source code must retain the above copyright 00011 * notice, this list of conditions and the following disclaimer. 00012 * * Redistributions in binary form must reproduce the above copyright 00013 * notice, this list of conditions and the following disclaimer in 00014 * the documentation and/or other materials provided with the 00015 * distribution. 00016 * * Neither the names of Duke University nor The University of 00017 * California, San Diego, nor the names of the authors or contributors 00018 * may be used to endorse or promote products derived from 00019 * this software without specific prior written permission. 00020 * 00021 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 00022 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00023 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 00024 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 00025 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00026 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 00027 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 00028 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 00029 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 00030 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00031 * 00032 * ----END-OF-LEGAL-STUFF---- */ 00033 #include <stdint.h> 00034 #include <sys/types.h> 00035 #include <string> 00036 00042 #ifndef BLOCK_MANAGER_H 00043 #define BLOCK_MANAGER_H 00044 00058 class BlockManager { 00059 public: 00060 BlockManager(); 00061 virtual const std::string& getPath() const = 0; 00062 virtual std::string getFileName() const = 0; 00063 virtual std::string getBlock(uint64_t index) = 0; 00064 virtual size_t setBlock(uint64_t index, const std::string& buffer) = 0; 00065 virtual size_t getBlockSize() const { return blockSize; } 00066 virtual void setBlockSize(size_t s) { blockSize = s; } 00067 virtual void prefetchBlock(uint64_t index) { } 00068 00069 virtual uint32_t getMinimumInterested() const { return minimumInterested; } 00070 virtual uint32_t getMaximumInterested() const { return maximumInterested; } 00071 virtual uint64_t getBlockCount() const { return blockCount; } 00072 virtual uint64_t getSize() const { return size; } 00073 virtual int open(const std::string& path, const char* mode) = 0; 00074 virtual bool isOpen() const = 0; 00075 virtual int close() = 0; 00076 virtual int flush() = 0; 00077 virtual ~BlockManager() {} 00078 00079 public: 00080 static const size_t DEFAULT_BLOCK_SIZE; 00081 00082 protected: 00083 size_t blockSize; 00084 uint64_t blockCount; 00085 uint64_t size; 00086 public: 00087 uint32_t minimumInterested; 00088 uint32_t maximumInterested; 00089 }; // BlockManager 00090 00093 #endif // BLOCK_MANAGER_H