gui/src/ActiveSessionMemoryStorage.h

   1 #ifndef AESALON_GUI_ACTIVE_SESSION_MEMORY_STORAGE_H
   2 #define AESALON_GUI_ACTIVE_SESSION_MEMORY_STORAGE_H
   3
   4 #include <QtGlobal>
   5 #include <QMap>
   6
   7 class ActiveSessionMemoryBlock;
   8 class ActiveSessionMemorySnapshot;
   9
  10 /** The type used for storing data offsets. This MUST be a signed type, as
  11     negative offsets in Snapshots indicate item removals. */
  12 typedef qint64 StorageOffset;
  13
  14 class ActiveSessionMemoryStorage {
  15 public:
  16     enum allocation_mode_e {
  17         ALLOC_MODE_1M,
  18         ALLOC_MODE_DOUBLE
  19     };
  20     enum data_type_e {
  21         INVALID_DATA,
  22         BLOCK_DATA,
  23         SNAPSHOT_DATA
  24     };
  25 private:
  26     quint8 *data;
  27     StorageOffset data_size;
  28     StorageOffset unused_offset;
  29
  30     allocation_mode_e allocation_mode;
  31
  32     /** A QMap is used to store the type of each StorageOffset.
  33         QMap::operator[] is O(log n) for accessing, so it should be fast enough.
  34     */
  35     QMap<StorageOffset, data_type_e> data_types;
  36
  37     /** Reserves more memory. Uses the current allocation_mode to determine how much more to allocate. */
  38     void reserve_more_memory();
  39 public:
  40     ActiveSessionMemoryStorage(allocation_mode_e allocation_mode = ALLOC_MODE_1M);
  41     virtual ~ActiveSessionMemoryStorage();
  42
  43     StorageOffset get_data_size() const { return data_size; }
  44
  45     data_type_e get_offset_data_type(StorageOffset offset) const { return data_types[offset]; }
  46
  47     ActiveSessionMemoryBlock *alloc_new_block(quint64 address, quint64 size);
  48     ActiveSessionMemorySnapshot *alloc_new_snapshot();
  49
  50     ActiveSessionMemorySnapshot *copy_snapshot(StorageOffset offset);
  51
  52     /** Returns the block at @a offset data offset.
  53         @param offset The offset to look for a block at.
  54         @return The block at @a offset, or NULL otherwise.
  55     */
  56     ActiveSessionMemoryBlock *get_block_at(StorageOffset offset);
  57     /** Returns the snapshot at @a offset data offset.
  58         @param offset The offset to look for a snapshot at.
  59         @return The snapshot at @a offset, or NULL otherwise.
  60     */
  61     ActiveSessionMemorySnapshot *get_snapshot_at(StorageOffset offset);
  62 };
  63
  64 #endif