File synchronization java source code

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Javatpoint Services JavaTpoint offers too many high quality services. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 12 years, 9 months ago. Active 6 years, 7 months ago. Viewed 26k times. If this channel's file resides on a local storage device then when this method returns it is guaranteed that all changes made to the file since this channel was created, or since this method was last invoked, will have been written to that device.

This is useful for ensuring that critical information is not lost in the event of a system crash. The documentation to sync states: Force all system buffers to synchronize with the underlying device. This method returns after all modified data and attributes of this FileDescriptor have been written to the relevant device s. In particular, if this FileDescriptor refers to a physical storage medium, such as a file in a file system, sync will not return until all in-memory modified copies of buffers associated with this FileDesecriptor have been written to the physical medium.

These two calls should be sufficient. Is it? I guess they aren't. Update: I have done strace runs with "strace -cfT cmd". Update 3: To summarize the answers: Use c. A fflush submitted the data to the OS, but doesn't bring your data to the block device. Use strace to analyze the syscalls done by a command Cross check your results before posting a question.

Improve this question. Community Bot 1 1 1 silver badge. I'd really like to see throughput using just section 2 functions. Is it the same size as your buffer in Java?

You'd probably want at least page size on x86 or possibly higher. I've seen measurable improvements up to 32k on some machines. Oh, and of course if your buffer is page-aligned it will give the kernel more room for optimization.

Another possible issue is the code you posted is not using the "low level APIs open,write,close ". It's using the higher level, portable stdio API fopen,fwrite,fclose which will add an extra layer of buffering by default.

Did you explicitly turn off buffering somewhere outside the code you posted? Add a comment. Active Oldest Votes. Improve this answer. Arunprasanth K V Download Executable JAR file: filemirrorsync. The "-Xmx" option is only necessary if you have very much files.

Author: Christian d'Heureuse www. Only list the file and directory differences, without copying or changing anything. This is automatically done when one or both of the file systems are case-insensitive. Default is -noIgnoreCase. Default is -renameCase. Tolerance in milliseconds for comparing the last modified time of files.

This should be set to nearly 2 seconds when mirroring files to a FAT file systems from a non-FAT file system, because the FAT file system only has a 2 seconds resolution. Default is