Class MDBEnvInfo

  • All Implemented Interfaces:
    java.lang.AutoCloseable, NativeResource, Pointer

    public class MDBEnvInfo
    extends Struct
    implements NativeResource
    Information about the environment.

    Member documentation

    • me_mapaddr – Address of map, if fixed.
    • me_mapsize – Size of the data memory map.
    • me_last_pgno – ID of the last used page.
    • me_last_txnid – ID of the last committed transaction.
    • me_maxreaders – Max reader slots in the environment.
    • me_numreaders – Max reader slots used in the environment.

    Layout

    
     struct MDB_envinfo {
         void * me_mapaddr;
         mdb_size_t me_mapsize;
         mdb_size_t me_last_pgno;
         mdb_size_t me_last_txnid;
         unsigned int me_maxreaders;
         unsigned int me_numreaders;
     }
    • Field Detail

      • SIZEOF

        The struct size in bytes.
      • ALIGNOF

        The struct alignment in bytes.
      • ME_MAPADDR, ME_MAPSIZE, ME_LAST_PGNO, ME_LAST_TXNID, ME_MAXREADERS, ME_NUMREADERS

        The struct member offsets.
    • Constructor Detail

      • MDBEnvInfo

        public MDBEnvInfo​(java.nio.ByteBuffer container)
        Creates a MDBEnvInfo instance at the current position of the specified ByteBuffer container. Changes to the buffer's content will be visible to the struct instance and vice versa.

        The created instance holds a strong reference to the container object.

    • Method Detail

      • sizeof

        public int sizeof()
        Description copied from class: Struct
        Returns sizeof(struct).
        Specified by:
        sizeof in class Struct
      • me_mapaddr

        public long me_mapaddr()
        Returns the value of the me_mapaddr field.
      • me_mapsize

        public long me_mapsize()
        Returns the value of the me_mapsize field.
      • me_last_pgno

        public long me_last_pgno()
        Returns the value of the me_last_pgno field.
      • me_last_txnid

        public long me_last_txnid()
        Returns the value of the me_last_txnid field.
      • me_maxreaders

        public int me_maxreaders()
        Returns the value of the me_maxreaders field.
      • me_numreaders

        public int me_numreaders()
        Returns the value of the me_numreaders field.
      • malloc

        public static MDBEnvInfo malloc()
        Returns a new MDBEnvInfo instance allocated with memAlloc. The instance must be explicitly freed.
      • create

        public static MDBEnvInfo create​(long address)
        Returns a new MDBEnvInfo instance for the specified memory address.
      • createSafe

        @Nullable
        public static MDBEnvInfo createSafe​(long address)
        Like create, but returns null if address is NULL.
      • malloc

        public static MDBEnvInfo.Buffer malloc​(int capacity)
        Returns a new MDBEnvInfo.Buffer instance allocated with memAlloc. The instance must be explicitly freed.
        Parameters:
        capacity - the buffer capacity
      • calloc

        public static MDBEnvInfo.Buffer calloc​(int capacity)
        Returns a new MDBEnvInfo.Buffer instance allocated with memCalloc. The instance must be explicitly freed.
        Parameters:
        capacity - the buffer capacity
      • create

        public static MDBEnvInfo.Buffer create​(long address,
                                               int capacity)
        Create a MDBEnvInfo.Buffer instance at the specified memory.
        Parameters:
        address - the memory address
        capacity - the buffer capacity
      • createSafe

        @Nullable
        public static MDBEnvInfo.Buffer createSafe​(long address,
                                                   int capacity)
        Like create, but returns null if address is NULL.
      • callocStack

        public static MDBEnvInfo callocStack()
        Returns a new MDBEnvInfo instance allocated on the thread-local MemoryStack and initializes all its bits to zero.
      • callocStack

        public static MDBEnvInfo callocStack​(MemoryStack stack)
        Returns a new MDBEnvInfo instance allocated on the specified MemoryStack and initializes all its bits to zero.
        Parameters:
        stack - the stack from which to allocate
      • callocStack

        public static MDBEnvInfo.Buffer callocStack​(int capacity)
        Returns a new MDBEnvInfo.Buffer instance allocated on the thread-local MemoryStack and initializes all its bits to zero.
        Parameters:
        capacity - the buffer capacity
      • callocStack

        public static MDBEnvInfo.Buffer callocStack​(int capacity,
                                                    MemoryStack stack)
        Returns a new MDBEnvInfo.Buffer instance allocated on the specified MemoryStack and initializes all its bits to zero.
        Parameters:
        stack - the stack from which to allocate
        capacity - the buffer capacity
      • nme_mapaddr

        public static long nme_mapaddr​(long struct)
        Unsafe version of me_mapaddr().
      • nme_mapsize

        public static long nme_mapsize​(long struct)
        Unsafe version of me_mapsize().
      • nme_last_pgno

        public static long nme_last_pgno​(long struct)
        Unsafe version of me_last_pgno().
      • nme_last_txnid

        public static long nme_last_txnid​(long struct)
        Unsafe version of me_last_txnid().
      • nme_maxreaders

        public static int nme_maxreaders​(long struct)
        Unsafe version of me_maxreaders().
      • nme_numreaders

        public static int nme_numreaders​(long struct)
        Unsafe version of me_numreaders().