Package com._1c.g5.v8.xmdb.impl

Interface ITreeCache

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      long clone​(long cLink)
      Clone element by cLink (new element should not be cached by default).
      void dropCaches()
      Drop all cache
      void dropCaches​(int segment)
      Drop cache entry with specified segment id
      void evict()
      Evict (usually - write to disk, but not sync) all cache entry (from write node cache).
      void evict​(int segmentId)
      Evict (usually - write to disk, but no sync) all cache entry (from write node cache) with specified segmentId.
      BNode get​(long cLink, boolean storeValuesInLeaf, int t, int segment)
      Read BNode from cache.
      Engine getEngine()
      Get underlying db engine
      byte[] getObject​(long cLink, int segment)
      Read object from cache.
      long put​(long oldPos, BNode val, int segment, boolean valInLeaf, int preallocFreeSpace)
      Put (insert or update) BNode into cache.
      long putObject​(byte[] value, int segment)
      Put object (value) into cache
      long putObject​(ByteBuffer value, int segment)
      Put object (value) into cache
      byte[] removeObject​(long cLink, int segment)
      Removes object from cache.
      void sync()
      Sync all write node cache entry and sync
      void sync​(int segmentId)
      Write to disk (and sync) all cache entry (from write node cache) with specified segmentId.

    • Method Detail

      • put

        long put​(long oldPos,
         BNode val,
         int segment,
         boolean valInLeaf,
         int preallocFreeSpace)
        Put (insert or update) BNode into cache. Cache return new adress of BNode (can be the same if BNode fit into allocated block)
        Parameters:
        oldPos - old cLink address of BNode or CompactLink.EMPTY_LINK if its first time save to current BNode
        val - BNode to save
        segment - segment id
        valInLeaf - store value in leaf flag
        preallocFreeSpace - default prealloc space for current BTree
        Returns:
        actual cLink to stored BNode

      • putObject

        long putObject​(ByteBuffer value,
               int segment)
        Put object (value) into cache
        Parameters:
        value - value to store
        segment - segment id
        Returns:
        actual cLink to stored object

      • putObject

        long putObject​(byte[] value,
               int segment)
        Put object (value) into cache
        Parameters:
        value - value to store
        segment - segment id
        Returns:
        actual cLink to stored object

      • get

        BNode get​(long cLink,
          boolean storeValuesInLeaf,
          int t,
          int segment)
        Read BNode from cache. If BNode won't be found in read/write node caches - it will be load from disk into read cache before return
        Parameters:
        cLink - BNode address (cLink)
        storeValuesInLeaf - value in leaf flag (for deserialization, if node on disk)
        t - node width, t (for deserialization, if node on disk)
        segment - segment id
        Returns:
        readed BNode

      • getObject

        byte[] getObject​(long cLink,
                 int segment)
        Read object from cache. If object won't be found in object cache - it will be load from disk into object cache before return
        Parameters:
        cLink - object address (cLink)
        segment - segmentId
        Returns:
        readed object

      • removeObject

        byte[] removeObject​(long cLink,
                    int segment)
        Removes object from cache.
        Parameters:
        cLink - object address (cLink)
        segment - segmentId
        Returns:
        removed object

      • dropCaches

        void dropCaches​(int segment)
        Drop cache entry with specified segment id
        Parameters:
        segment - segment id to drop

      • dropCaches

        void dropCaches()
        Drop all cache

      • sync

        void sync​(int segmentId)
        Write to disk (and sync) all cache entry (from write node cache) with specified segmentId. Writed segments will be moved to read cache.
        Parameters:
        segmentId - segment to write

      • sync

        void sync()
        Sync all write node cache entry and sync

      • evict

        void evict​(int segmentId)
        Evict (usually - write to disk, but no sync) all cache entry (from write node cache) with specified segmentId. Writed segments will be removed from cache. Remove all cache entry with specified segmentId from read/object caches.
        Parameters:
        segmentId - segment to evict

      • evict

        void evict()
        Evict (usually - write to disk, but not sync) all cache entry (from write node cache). Remove all cache entry from read/object caches.

      • getEngine

        Engine getEngine()
        Get underlying db engine
        Returns:
        engine

      • clone

        long clone​(long cLink)
        Clone element by cLink (new element should not be cached by default). Not for value body objects.
        Parameters:
        cLink - link to original element to clone
        Returns:
        link to clone of original element