* metadata. Currently implemented as map<string, string>. */
typedef std::map<std::string, std::string> dictionary;
+/* In-memory representation of a UUID (Universally-Unique Identifier), which is
+ * used to name a segment. */
+struct uuid {
+ uint8_t bytes[16];
+};
+
/* IOException will be thrown if an error occurs while reading or writing in
* one of the I/O wrappers. Depending upon the context; this may be fatal or
* not--typically, errors reading/writing the store will be serious, but errors
void write_varint(uint64_t val);
+ void write_uuid(const struct uuid &u);
void write_string(const std::string &s);
void write_dictionary(const dictionary &d);
std::string encode_u16(uint16_t val);
std::string encode_u32(uint32_t val);
std::string encode_u64(uint64_t val);
-
-struct uuid {
- uint8_t bytes[16];
-};
+std::string encode_objref(const struct uuid &segment, uint32_t object);
/* A class which is used to pack multiple objects into a single segment, with a
* lookup table to quickly locate each object. Call new_object() to get an
struct uuid get_uuid() const { return id; }
// Start writing out a new object to this segment.
- OutputStream *new_object();
+ OutputStream *new_object(int *id, const char *type);
void finish_object();
// Determine size of segment data written out so far.
static std::string format_uuid(const struct uuid u);
private:
- typedef std::vector<std::pair<int64_t, int64_t> > object_table;
+ struct index_info {
+ int64_t offset; // File offset at which object starts
+ int64_t size; // Size of object in bytes
+ char type[4]; // Object type code
+ };
+
+ typedef std::vector<struct index_info> object_table;
ChecksumOutputStream *out; // Output stream with checksumming enabled
OutputStream *raw_out; // Raw output stream, without checksumming
struct uuid id;
- int64_t object_start_offset;
OutputStream *object_stream;
object_table objects;
explicit SegmentPartitioner(SegmentStore *s);
~SegmentPartitioner();
- OutputStream *new_object();
+ OutputStream *new_object(struct uuid *uuid, int *id, const char *type);
private:
size_t target_size;