I'm writing some java code that creates a directory and then puts some files in that directory. I don't care about the order in which the files are created, however, for the files to be successfully created the directory needs to exit first.
I want to use the (newish) java.nio.Files api as it has quite an elegant set of methods for working with files and directories.
While it's nice that the Files class is non-blocking it means that the directory doesn't always exist. Is there a "right" way to determine when the Files.createDirectories(path) has completed?
Not particularly complex (which is why I like the Files api) but here's some sample code:
Files.createDirectories(path);
Files.write(filename1, "some content".getBytes());
Files.write(filename2, "some other content".getBytes());
In the above path might be /tmp/blah and filename1 = /tmp/blah/foo and filename2 = /tmp/blah/bar.
Obviously I can do this using some other class or library (like Commons IO) but the build in java.nio.Files is quite nice.
I think you misunderstood. Those operations are actually synchronous, so you're good to go here. Files.write uses a java.io.OutputStream for example.
Some Name addressed the possible implementation of createDirectory for Linux.
On Windows, createDirectory uses the CreateDirectory WinAPI function.
WindowsNativeDispatcher.CreateDirectory(var3.getPathForWin32Calls(), var4.address() /* Security descriptor */);
Buffers, Channels and Selectors are non-blocking.