Examples of com.fasterxml.uuid.ext.FileBasedTimestampSynchronizer

com.fasterxml.uuid.ext.FileBasedTimestampSynchronizer

Implementation of {@link TimestampSynchronizer}, which uses file system as the storage and locking mechanism.

Synchronization is achieved by obtaining an exclusive file locks on two specified lock files, and by using the files to store first "safe" timestamp value that the generator can use; alternating between one to use to ensure one of them always contains a valid timestamp. Latter is needed to guard against system clock moving backwards after UUID generator restart.

Note: this class will only work on JDK 1.4 and above, since it requires NIO package to do proper file locking (as well as new opening mode for {@link RandomAccessFile}).

Also note that it is assumed that the caller has taken care to synchronize access to method to be single-threaded. As such, none of the methods is explicitly synchronized here.

    public UUIDTimeIDGenerator() {
        try {
            uuid1 = new File(System.getProperty("java.io.tmpdir") + File.separator + "uuid1.lck");
            uuid2 = new File(System.getProperty("java.io.tmpdir") + File.separator + "uuid2.lck");


            synchronizer = new FileBasedTimestampSynchronizer(uuid1, uuid2);


            generator = Generators.timeBasedGenerator(EthernetAddress.fromInterface(), synchronizer);
        } catch (IOException e) {
            log.error("error initialising time-based UUID generator",e);
        }

Examples of com.fasterxml.uuid.ext.FileBasedTimestampSynchronizer

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