Package org.apache.jena.dboe.base.page

Class PageBlockMgr<T extends Page>

  • All Implemented Interfaces:
    org.apache.jena.atlas.lib.Closeable
    Direct Known Subclasses:
    RecordBufferPageMgr
    public class PageBlockMgr<T extends Page>
extends java.lang.Object
implements org.apache.jena.atlas.lib.Closeable
    Engine that wraps from blocks to typed pages.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      long allocLimit()  
      void close()  
      T create​(BlockType bType)
      Allocate a new thing
      void dump()  
      void finishRead()
      Signal the completion of an read operation
      void finishUpdate()
      Signal the completion of an update operation
      void free​(Page page)  
      BlockMgr getBlockMgr()  
      T getRead​(int id)
      Fetch a block for reading.
      T getRead​(int id, int referencingId)
      Fetch a block for reading.
      T getWrite​(int id)
      Fetch a block for writing.
      T getWrite​(int id, int referencingId)
      Fetch a block for writing.
      boolean promoteDuplicate​(Page page)
      Promote a page - return 'true' if the block changed (.reset()) will have been called
      void promoteInPlace​(Page page)
      Promote a page to be writable in-place (block id does not change, hence page does not change id).
      void put​(T page)  
      void release​(Page page)  
      void resetAlloc​(long boundary)  
      void startRead()
      Signal the start of an read operation
      void startUpdate()
      Signal the start of an update operation
      boolean valid​(int id)  
      void write​(T page)  

      • Methods inherited from class java.lang.Object

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

    • Method Detail

      • getBlockMgr

        public BlockMgr getBlockMgr()

      • allocLimit

        public long allocLimit()

      • resetAlloc

        public void resetAlloc​(long boundary)

      • create

        public T create​(BlockType bType)
        Allocate a new thing

      • getRead

        public T getRead​(int id)
        Fetch a block for reading.
        Parameters:
        id - Block to fetch

      • getRead

        public T getRead​(int id,
                 int referencingId)
        Fetch a block for reading.
        Parameters:
        id - Block to fetch
        referencingId - Id of block referring to this one. For example, a parent in a tree. May be negative for "none" or "meaningless".

      • getWrite

        public T getWrite​(int id)
        Fetch a block for writing.
        Parameters:
        id - Block to fetch

      • getWrite

        public T getWrite​(int id,
                  int referencingId)
        Fetch a block for writing.
        Parameters:
        id - Block to fetch
        referencingId - Id of block referring to this one. For example, a parent in a tree. May be -1 for "none" or "meaningless".

      • put

        public void put​(T page)

      • write

        public void write​(T page)

      • release

        public void release​(Page page)

      • free

        public void free​(Page page)

      • promoteInPlace

        public void promoteInPlace​(Page page)
        Promote a page to be writable in-place (block id does not change, hence page does not change id).

      • promoteDuplicate

        public boolean promoteDuplicate​(Page page)
        Promote a page - return 'true' if the block changed (.reset()) will have been called

      • valid

        public boolean valid​(int id)

      • dump

        public void dump()

      • startUpdate

        public void startUpdate()
        Signal the start of an update operation

      • finishUpdate

        public void finishUpdate()
        Signal the completion of an update operation

      • startRead

        public void startRead()
        Signal the start of an read operation

      • finishRead

        public void finishRead()
        Signal the completion of an read operation

      • close

        public void close()
        Specified by:
        close in interface org.apache.jena.atlas.lib.Closeable