[11] Forcing Updates to a File to the Disk

[11] Forcing Updates to a File to the Disk

In some applications, such as transaction processing, it is necessary to ensure that an update has been made to the disk. FileDescriptor.sync() blocks until all changes to a file are written to disk.

				
						 try { // Open or create the output file FileOutputStream os = new FileOutputStream("outfilename"); FileDescriptor fd = os.getFD(); // Write some data to the stream byte[] data = new byte[]{(byte)0xCA, (byte)0xFE, (byte)0xBA, (byte)0xBE}; os.write(data); // Flush the data from the streams and writers into system buffers. // The data may or may not be written to disk. os.flush(); // Block until the system buffers have been written to disk. // After this method returns, the data is guaranteed to have // been written to disk. fd.sync(); } catch (IOException e) { }
				
		

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