ddl0impl-loader.h

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/** @file include/ddl0impl-loader.h
 DDL index loader interface.
 Created 2020-11-01 by Sunny Bains. */
 
#ifndef ddl0impl_loader_h
#define ddl0impl_loader_h
 
#include "ddl0fts.h"
#include "ddl0impl-buffer.h"
#include "ut0mpmcbq.h"
 
namespace ddl {
 
/** Build indexes on a table by reading a clustered index, creating a temporary
file containing index entries, merge sorting these index entries and inserting
sorted index entries to indexes. */
class Loader {
 public:
  /** Builder task. */
  struct Task {
    /** Constructor. */
    Task() = default;
 
    /** Constructor.
    @param[in,out] builder        Builder that performs the operation. */
    explicit Task(Builder *builder) : m_builder(builder) {}
 
    /** Constructor.
    @param[in,out] builder        Builder that performs the operation.
    @param[in] thread_id          Index value of the thread_state to work on. */
    explicit Task(Builder *builder, size_t thread_id)
        : m_builder(builder), m_thread_id(thread_id) {}
 
    /** Do the operation.
    @return DB_SUCCESS or error code. */
    [[nodiscard]] dberr_t operator()() noexcept;
 
   private:
    /** Builder instance. */
    Builder *m_builder{};
 
    /** Thread state index. */
    size_t m_thread_id{std::numeric_limits<size_t>::max()};
 
    friend class Loader;
  };
 
  // Forward declaration
  class Task_queue;
 
  /** Constructor.
  @param[in,out] ctx            DDL context. */
  explicit Loader(ddl::Context &ctx) noexcept;
 
  /** Destructor. */
  ~Loader() noexcept;
 
  /** Build the read instance.
  @return DB_SUCCESS or error code. */
  [[nodiscard]] dberr_t build_all() noexcept;
 
  /** Add a task to the task queue.
  @param[in] task               Task to add. */
  void add_task(Task task) noexcept;
 
  /** Validate the indexes (except FTS).
  @return true on success. */
  [[nodiscard]] bool validate_indexes() const noexcept;
 
 private:
  /** Prepare to build and load the indexes.
  @return DB_SUCCESS or error code. */
  [[nodiscard]] dberr_t prepare() noexcept;
 
  /** Load the indexes.
  @return DB_SUCCESS or error code. */
  [[nodiscard]] dberr_t load() noexcept;
 
  /** Scan and build the indexes.
  @return DB_SUCCESS or error code. */
  [[nodiscard]] dberr_t scan_and_build_indexes() noexcept;
 
 private:
  /** DDL context, shared by the loader threads. */
  ddl::Context &m_ctx;
 
  /** Index builders. */
  Builders m_builders{};
 
  /** Task queue. */
  Task_queue *m_taskq{};
};
 
}  // namespace ddl
 
#endif /* !ddl0impl_loader_h */