initial code repo

[stor4nfv.git] / src / ceph / src / erasure-code / shec / ErasureCodeShecTableCache.h

diff --git a/src/ceph/src/erasure-code/shec/ErasureCodeShecTableCache.h b/src/ceph/src/erasure-code/shec/ErasureCodeShecTableCache.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2014 FUJITSU LIMITED
+ * Copyright (C) 2014 CERN (Switzerland)
+ *
+ * Author: Takanori Nakao <nakao.takanori@jp.fujitsu.com>
+ * Author: Takeshi Miyamae <miyamae.takeshi@jp.fujitsu.com>
+ * Author: Andreas-Joachim Peters <Andreas.Joachim.Peters@cern.ch>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ */
+
+#ifndef CEPH_ERASURE_CODE_SHEC_TABLE_CACHE_H
+#define CEPH_ERASURE_CODE_SHEC_TABLE_CACHE_H
+
+// -----------------------------------------------------------------------------
+#include "common/Mutex.h"
+#include "erasure-code/ErasureCodeInterface.h"
+// -----------------------------------------------------------------------------
+#include <list>
+// -----------------------------------------------------------------------------
+
+class ErasureCodeShecTableCache {
+  // ---------------------------------------------------------------------------
+  // This class implements a table cache for encoding and decoding matrices.
+  // Encoding matrices are shared for the same (k,m,c,w) combination.
+  // It supplies a decoding matrix lru cache which is shared for identical
+  // matrix types e.g. there is one cache (lru-list + lru-map)
+  // ---------------------------------------------------------------------------
+
+  class DecodingCacheParameter {
+   public:
+    int* decoding_matrix;  // size: k*k
+    int* dm_row;  // size: k
+    int* dm_column;  // size: k
+    int* minimum;  // size: k+m
+    DecodingCacheParameter() {
+      decoding_matrix = 0;
+      dm_row = 0;
+      dm_column = 0;
+      minimum = 0;
+    }
+    ~DecodingCacheParameter() {
+      if (decoding_matrix) {
+        delete[] decoding_matrix;
+      }
+      if (dm_row) {
+        delete[] dm_row;
+      }
+      if (dm_column) {
+        delete[] dm_column;
+      }
+      if (minimum) {
+        delete[] minimum;
+      }
+    }
+  };
+
+ public:
+
+  static const int decoding_tables_lru_length = 10000;
+  typedef std::pair<std::list<uint64_t>::iterator,
+                    DecodingCacheParameter> lru_entry_t;
+  typedef std::map< int, int** > codec_table_t;
+  typedef std::map< int, codec_table_t > codec_tables_t__;
+  typedef std::map< int, codec_tables_t__ > codec_tables_t_;
+  typedef std::map< int, codec_tables_t_ > codec_tables_t;
+  typedef std::map< int, codec_tables_t > codec_technique_tables_t;
+  // int** matrix = codec_technique_tables_t[technique][k][m][c][w]
+  
+  typedef std::map< uint64_t, lru_entry_t > lru_map_t;
+  typedef std::list< uint64_t > lru_list_t;
+
+ ErasureCodeShecTableCache() :
+  codec_tables_guard("shec-lru-cache")
+    {
+    }
+  
+  virtual ~ErasureCodeShecTableCache();
+  
+  Mutex codec_tables_guard; // mutex used to protect modifications in encoding/decoding table maps
+  
+  bool getDecodingTableFromCache(int* matrix,
+                                 int* dm_row, int* dm_column,
+                                 int* minimum,
+                                 int technique,
+                                 int k, int m, int c, int w,
+                                 int* want, int* avails);
+
+  void putDecodingTableToCache(int* matrix,
+                               int* dm_row, int* dm_column,
+                               int* minimum,
+                               int technique,
+                               int k, int m, int c, int w,
+                               int* want, int* avails);
+
+  int** getEncodingTable(int technique, int k, int m, int c, int w);
+  int** getEncodingTableNoLock(int technique, int k, int m, int c, int w);
+  int* setEncodingTable(int technique, int k, int m, int c, int w, int*);
+  
+ private:
+  // encoding table accessed via table[matrix][k][m][c][w]
+  // decoding table cache accessed via map[matrixtype]
+  // decoding table lru list accessed via list[matrixtype]
+  codec_technique_tables_t encoding_table;
+  std::map<int, lru_map_t*> decoding_tables;
+  std::map<int, lru_list_t*> decoding_tables_lru;
+
+  lru_map_t* getDecodingTables(int technique);
+  lru_list_t* getDecodingTablesLru(int technique);
+  uint64_t getDecodingCacheSignature(int k, int m, int c, int w,
+                                     int *want, int *avails);
+
+  Mutex* getLock();
+};
+
+#endif