Package org.apache.jena.dboe.base.block

Class BlockMgrFileAccess

java.lang.Object
org.apache.jena.dboe.base.block.BlockMgrBase
org.apache.jena.dboe.base.block.BlockMgrFileAccess
All Implemented Interfaces:
org.apache.jena.atlas.lib.Closeable, org.apache.jena.atlas.lib.Sync, BlockMgr
public final class BlockMgrFileAccess extends BlockMgrBase
Block manager that maps from the FileAccess layer to a BlockMgr. Add free block management (but we should layer with BlockMgrFreeChain)

  • Method Summary

    Modifier and Type
    Method
    Description
    long
    allocLimit()
    The fixed allocated blocks are in the range [0,allocLimit).
    void
    close()
    Close the block manager
    void
    free(Block block)
    Announce a block is no longer in use (i.e it's now freed)
    Block
    getRead(long id)
    Fetch a block, use for read only
    Block
    getWrite(long id)
    Fetch a block, use for write and read - only inside "update"
    boolean
    isClosed()
    Is this block manager still usable? Closed block managers can not perform any operations except this one.
    boolean
    isEmpty()
    Answer whether there are any blocks in the collection being managed
    void
    overwrite(Block block)
    Replace the contents of a block slot with new contents.
    Block
    promote(Block block)
    Promote to writable : it's OK to promote an already writable block
    void
    release(Block block)
    Release a block, unmodified or already written.
    void
    resetAlloc(long boundary)
    Reset the allocation limit, should be a number previously obtained from allocLimit
    void
    sync()
    Sync the block manager
    void
    syncForce()
    Sync the block manager : system operation to ensure sync() is passed down
    String
    toString()
     
    boolean
    valid(int id)
    Is this a valid block id? (may be a free block)
    void
    write(Block block)
    Write a block back - it still needs releasing.

    Methods inherited from class org.apache.jena.dboe.base.block.BlockMgrBase

    allocate, beginRead, beginUpdate, endRead, endUpdate, getLabel

    Methods inherited from class java.lang.Object

    equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

  • Method Details

    • promote

      public Block promote(Block block)
      Description copied from interface: BlockMgr
      Promote to writable : it's OK to promote an already writable block

    • getRead

      public Block getRead(long id)
      Description copied from interface: BlockMgr
      Fetch a block, use for read only

    • getWrite

      public Block getWrite(long id)
      Description copied from interface: BlockMgr
      Fetch a block, use for write and read - only inside "update"

    • release

      public void release(Block block)
      Description copied from interface: BlockMgr
      Release a block, unmodified or already written.

    • write

      public void write(Block block)
      Description copied from interface: BlockMgr
      Write a block back - it still needs releasing.

    • overwrite

      public void overwrite(Block block)
      Description copied from interface: BlockMgr
      Replace the contents of a block slot with new contents. Block does not need releasing. The write() operation may not do real work if the block is mapped - this operation really does replace the contents with the new contents.

    • free

      public void free(Block block)
      Description copied from interface: BlockMgr
      Announce a block is no longer in use (i.e it's now freed)

    • valid

      public boolean valid(int id)
      Description copied from interface: BlockMgr
      Is this a valid block id? (may be a free block)

    • sync

      public void sync()
      Description copied from interface: BlockMgr
      Sync the block manager

    • syncForce

      public void syncForce()
      Description copied from interface: BlockMgr
      Sync the block manager : system operation to ensure sync() is passed down

    • isClosed

      public boolean isClosed()
      Description copied from interface: BlockMgr
      Is this block manager still usable? Closed block managers can not perform any operations except this one.

    • close

      public void close()
      Description copied from interface: BlockMgr
      Close the block manager

    • isEmpty

      public boolean isEmpty()
      Description copied from interface: BlockMgr
      Answer whether there are any blocks in the collection being managed

    • allocLimit

      public long allocLimit()
      Description copied from interface: BlockMgr
      The fixed allocated blocks are in the range [0,allocLimit). Allocation units need not be +1 increments

    • resetAlloc

      public void resetAlloc(long boundary)
      Description copied from interface: BlockMgr
      Reset the allocation limit, should be a number previously obtained from allocLimit

    • toString

      public String toString()
      Overrides:
      toString in class Object