Class MappedByteBuffer

Method Detail

• isLoaded

  public final boolean isLoaded()

  Tells whether or not this buffer's content is resident in physical memory.

  A return value of true implies that it is highly likely that all of the data in this buffer is resident in physical memory and may therefore be accessed without incurring any virtual-memory page faults or I/O operations. A return value of false does not necessarily imply that the buffer's content is not resident in physical memory.

  The returned value is a hint, rather than a guarantee, because the underlying operating system may have paged out some of the buffer's data by the time that an invocation of this method returns.

  Returns:

  true if it is likely that this buffer's content is resident in physical memory

• load

  public final MappedByteBuffer load()

  Loads this buffer's content into physical memory.

  This method makes a best effort to ensure that, when it returns, this buffer's content is resident in physical memory. Invoking this method may cause some number of page faults and I/O operations to occur.

  Returns:

  This buffer

• force

  public final MappedByteBuffer force()

  Forces any changes made to this buffer's content to be written to the storage device containing the mapped file.

  If the file mapped into this buffer resides on a local storage device then when this method returns it is guaranteed that all changes made to the buffer since it was created, or since this method was last invoked, will have been written to that device.

  If the file does not reside on a local device then no such guarantee is made.

  If this buffer was not mapped in read/write mode (FileChannel.MapMode.READ_WRITE) then invoking this method has no effect.

  Returns:

  This buffer