Java Glossary : exclusive access

Java definitions: 0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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exclusive access

Whether or not file access is exclusive depends on the operating system itself and can't be specified through the Java API. However, it is easy to setup a protocol by creating a lock file, as Java does guarantee that file existence and creation testing is atomic. To do this,

File lockFile = new File ("lock.lok" );
if ( lockFile.createNewFile() )
   {
   // You now have the lock file -- it is create, so do
   // what you want to the data file
   // Delete the lock file when you're done
   lockFile.delete();
   lockFile.deleteOnExit();
   // A good fail-safe for releasing the lock
   }
else
   {
   // The lock file already exists, so you can't access the data file right now.
   // Go away and try again later.
   }

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