On 3/20/06, David Kerber <[EMAIL PROTECTED]> wrote: > I have a situation where my java-Tomcat application will be writing > lines of data one at a time (but quickly and lots of them, eventually > approx 2 million lines per day, though only about 500k right now) to a > disk file, and another, Delphi, appication will be reading and > processing those lines, one line at a time. I have done some reading > about the Synchronized keyword and I *think* I understand how it > interacts with other java apps,
It doesn't interact with other java applications. Only with other Threads in the same VM. That of course depends on your definition of the application. >but can't tell if that extends to > applications running elsewhere in the OS (Windows in this case). No. > If I > use a Synchronized block around my code that does the writing to disk, > will the Delphi app (assuming competent programmers) be able to monitor > and read that file without me closing it after each write? The Delphi > app does not need to write to the file, only read from it. This is OS dependent. If the OS allows multiple reads/write to a file, it would be no problem. If I have tomcat in one shell under windows and tail the logfiles in another - it works, so why shouldn't your application work too. I think (<speculation>) that you can open files under windows in exclusive and non-exclusive mode, as long as you use the non-exclusive mode, you'll have no problems. IMHO Java uses the non-exclusive mode. (</speculation>). My guess is, that your scenario will work without problems, at least as long as your writer is faster than your reader, or your reader can handle temporarly out-of-bytes :-) > > Thanks for any info or links! > DAve Leon --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
