Examples of net.jini.id.Uuid

net.jini.id.Uuid
A 128-bit value to serve as a universally unique identifier. Two Uuids are equal if they have the same 128-bit value. Uuid instances can be created using the static methods of the {@link UuidFactory} class.
The design of this class is intended to support the use of universally unique identifiers that
1. have a high likelihood of uniqueness over space and time and
2. are computationally difficult to guess.
The second goal is intended to support the treatment of data containing a Uuid as a capability. Note that not all defined Uuid values imply a generation algorithm that supports this goal.
The most significant 64 bits of the value can be decomposed into unsigned integer fields according to the following bit masks:
```
 0xFFFFFFFF00000000	time_low 0x00000000FFFF0000	time_mid 0x000000000000F000	version 0x0000000000000FFF	time_hi 
```
The least significant 64 bits of the value can be decomposed into unsigned integer fields according to the following bit masks:
```
 0xC000000000000000	variant 0x3FFF000000000000	clock_seq 0x0000FFFFFFFFFFFF	node 
```
This specification defines the meaning (and implies aspects of the generation algorithm) of Uuid values if the variant field is 0x2 and the version field is either 0x1 or 0x4.
If the version field is 0x1, then
- the time_low, time_mid, and time_hi fields are the least, middle, and most significant bits (respectively) of a 60-bit timestamp of 100-nanosecond intervals since midnight, October 15, 1582 UTC,
- the clock_seq field is a 14-bit number chosen to help avoid duplicate Uuid values in the event of a changed node address or a backward system clock adjustment (such as a random number when in doubt, or the previously used number incremented by one if just a backward clock adjustment is detected), and
- the node field is an IEEE 802 address (a 48-bit value).
  As an alternative to an IEEE 802 address (such as if one is not available to the generation algorithm), the node field may also be a 48-bit number for which the most significant bit is set to 1 and the remaining bits were produced from a cryptographically strong random sequence.
If the version field is 0x4, then the time_low, time_mid, time_hi, clock_seq, and node fields are values that were produced from a cryptographically strong random sequence.
Only Uuid values with a version field of 0x4 are considered computationally difficult to guess. A Uuid value with a version field of 0x1 should not be treated as a capability.
A subclass of Uuid must not implement {@link Externalizable}; this restriction is enforced by this class's constructor and readObject methods. @author Sun Microsystems, Inc. @since 2.0

                recoveryLogger.log(Level.FINEST, "Rebuilding transient state ...");
            }
      Collection regs = regByID.values();
      Iterator iter = regs.iterator();
      ServiceRegistration reg = null;
      Uuid uuid = null;
            EventLogIterator eli = null; 
      while (iter.hasNext()) {
          reg = (ServiceRegistration)iter.next(); // get Reg
          uuid = (Uuid)reg.getCookie();           // get its Uuid
          if (recoveryLogger.isLoggable(Level.FINEST)) {

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  }
        if (duration < 1 && duration != Lease.ANY) 
      throw new IllegalArgumentException(
          "Duration must be a positive value");
        // Create new ServiceRegistration object
        Uuid uuid = UuidFactory.generate(); 
        EventLogIterator iter = persistent?
      eventLogFactory.iterator(uuid, 
          getEventLogPath(persistenceDirectory, uuid)):
      eventLogFactory.iterator(uuid);
        ServiceRegistration reg = new ServiceRegistration(uuid, iter);

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      operationsLogger.entering(mailboxSourceClass, 
          "enableDeliveryDo", new Object[] {uuid, preparedTarget});
  }
  // Check for the resubmission of one of our own listeners
  if (preparedTarget instanceof ListenerProxy) {
      Uuid id = ((ListenerProxy)preparedTarget).getReferentUuid(); 
      if (regByID.get(id) != null) {
          if(deliveryLogger.isLoggable(Level.FINEST)) {
                    deliveryLogger.log(Level.FINEST, 
                  "Disallowing resubmission of one of" 
            +  " this service''s own listeners: {0}", id);

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        // Note: the following method will throw a ThrowThis exception
        // if the registration is invalid (i.e. expired or non-existent)
        ServiceRegistration reg = getServiceRegistration(uuid); 
        
        Uuid iteratorId = UuidFactory.generate();
        if(deliveryLogger.isLoggable(Level.FINEST)) {
            deliveryLogger.log(Level.FINEST, 
                "Generated remote event iterator id {0}", iteratorId);
        }       
  // Log this event

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        throws InvalidIteratorException, ThrowThis
    {
        // Note: the following method will throw a ThrowThis exception
        // if the registration is invalid (i.e. expired or non-existent)
        ServiceRegistration reg = getServiceRegistration(regId); 
        Uuid validIterId = reg.getRemoteEventIteratorID();
        if (!iterId.equals(validIterId)) {
      if(deliveryLogger.isLoggable(Level.FINEST)) {
                deliveryLogger.log(Level.FINEST, 
              "Provided iterator id " + iterId + 
                    " doesn't match current valid iterator id " +

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                  // we hold the lock. 
                  // TODO: optimize loop to ignore indices w/o available events
                  // TODO: optimize loop to skip nextInt if only one choice
                  while (count-- > 0) { 
                      int index = rand.nextInt(pendingReg.size());
                      Uuid uuid = (Uuid)pendingReg.get(index);
                      ServiceRegistration reg = null;
                  try { 
                            // Note: the following method will throw a 
                            // ThrowThis exception if the registration is 
                            // invalid (i.e. expired or non-existent)

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  tmpl = setupTmpl(tmpl);


        ServerTransaction str = serverTransaction(tr);
  Txn txn = enterTxn(tr);


  final Uuid cookie = UuidFactory.generate();
  final long eventID = nextID();
  final long now = System.currentTimeMillis();


  final EventRegistrationWatcher reg;
  if (txn == null) {

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  for (int i=0; i<tmpls.length; i++) {
      tmpls[i] = setupTmpl(tmpls[i]);
  }


  final Uuid cookie = UuidFactory.generate();
  final long eventID = nextID();
  final long now = System.currentTimeMillis();


  final AvailabilityRegistrationWatcher reg;
  if (txn == null) {

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    if (txn.getState() != ACTIVE)
        throw throwNewCannotJoinException();
      }
  }


  final Uuid uuid = UuidFactory.generate();
  final ContentsQuery contentsQuery = new ContentsQuery(uuid, tmpls, 
                    txn, limit);
  final EntryRep[] reps = contentsQuery.nextBatch(null, 
         System.currentTimeMillis());

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    if (txn.getState() != ACTIVE)
        throw throwNewCannotJoinException();
      }
  }


  final Uuid uuid = UuidFactory.generate();
  iterations.put(uuid, new IteratorImpl(tmpl, txn));
  return uuid;
    }

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