Package org.h2.store.fs.niomapped

Class FileNioMapped

  • All Implemented Interfaces:
    java.io.Closeable, java.lang.AutoCloseable, java.nio.channels.ByteChannel, java.nio.channels.Channel, java.nio.channels.GatheringByteChannel, java.nio.channels.InterruptibleChannel, java.nio.channels.ReadableByteChannel, java.nio.channels.ScatteringByteChannel, java.nio.channels.SeekableByteChannel, java.nio.channels.WritableByteChannel
    class FileNioMapped
extends FileBaseDefault
    Uses memory mapped files. The file size is limited to 2 GB.

    • Nested Class Summary

      • Nested classes/interfaces inherited from class java.nio.channels.FileChannel

        java.nio.channels.FileChannel.MapMode

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private java.nio.channels.FileChannel channel  
      private long fileLength  
      private static int GC_TIMEOUT_MS  
      private java.nio.MappedByteBuffer mapped  
      private java.nio.channels.FileChannel.MapMode mode  
      private java.lang.String name  

    • Constructor Summary

      Constructors 
      Constructor Description
      FileNioMapped​(java.lang.String fileName, java.lang.String mode)  

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      private static void checkFileSizeLimit​(long length)  
      void force​(boolean metaData)  
      void implCloseChannel()  
      protected void implTruncate​(long newLength)
      The truncate implementation.
      int read​(java.nio.ByteBuffer dst, long pos)  
      private void reMap()
      Re-map byte buffer into memory, called when file size has changed or file was created.
      void setFileLength​(long newLength)  
      long size()  
      java.lang.String toString()  
      java.nio.channels.FileLock tryLock​(long position, long size, boolean shared)  
      private void unMap()  
      int write​(java.nio.ByteBuffer src, long position)  

      • Methods inherited from class java.nio.channels.FileChannel

        lock, open, open, read, tryLock, write

      • Methods inherited from class java.nio.channels.spi.AbstractInterruptibleChannel

        begin, close, end, isOpen

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

      • Methods inherited from interface java.nio.channels.Channel

        isOpen

    • Field Detail

      • name

        private final java.lang.String name

      • mode

        private final java.nio.channels.FileChannel.MapMode mode

      • channel

        private java.nio.channels.FileChannel channel

      • mapped

        private java.nio.MappedByteBuffer mapped

      • fileLength

        private long fileLength

    • Constructor Detail

      • FileNioMapped

        FileNioMapped​(java.lang.String fileName,
              java.lang.String mode)
       throws java.io.IOException
        Throws:
        java.io.IOException

    • Method Detail

      • unMap

        private void unMap()
            throws java.io.IOException
        Throws:
        java.io.IOException

      • reMap

        private void reMap()
            throws java.io.IOException
        Re-map byte buffer into memory, called when file size has changed or file was created.
        Throws:
        java.io.IOException

      • checkFileSizeLimit

        private static void checkFileSizeLimit​(long length)
                                throws java.io.IOException
        Throws:
        java.io.IOException

      • implCloseChannel

        public void implCloseChannel()
                      throws java.io.IOException
        Overrides:
        implCloseChannel in class FileBase
        Throws:
        java.io.IOException

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object

      • size

        public long size()
          throws java.io.IOException
        Specified by:
        size in interface java.nio.channels.SeekableByteChannel
        Specified by:
        size in class java.nio.channels.FileChannel
        Throws:
        java.io.IOException

      • read

        public int read​(java.nio.ByteBuffer dst,
                long pos)
         throws java.io.IOException
        Overrides:
        read in class FileBase
        Throws:
        java.io.IOException

      • implTruncate

        protected void implTruncate​(long newLength)
                     throws java.io.IOException
        Description copied from class: FileBaseDefault
        The truncate implementation.
        Specified by:
        implTruncate in class FileBaseDefault
        Parameters:
        newLength - the new size
        Throws:
        java.io.IOException - on failure

      • setFileLength

        public void setFileLength​(long newLength)
                   throws java.io.IOException
        Throws:
        java.io.IOException

      • force

        public void force​(boolean metaData)
           throws java.io.IOException
        Overrides:
        force in class FileBase
        Throws:
        java.io.IOException

      • write

        public int write​(java.nio.ByteBuffer src,
                 long position)
          throws java.io.IOException
        Overrides:
        write in class FileBase
        Throws:
        java.io.IOException

      • tryLock

        public java.nio.channels.FileLock tryLock​(long position,
                                          long size,
                                          boolean shared)
                                   throws java.io.IOException
        Overrides:
        tryLock in class FileBase
        Throws:
        java.io.IOException