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

      URLClassLoader.newInstance(
    new URL[] { codebase },
    DgcServerExposure.class.getClassLoader());
  Class foreignUuidClass = Class.forName(foreignUuidClassName, false,
                 foreignUuidLoader);
  Uuid foreignUuid = (Uuid) foreignUuidClass.newInstance();


  /*
   * Establish two server endpoints and proxies for calling the
   * DGC servers at each of those endpoints.
   */

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  try {
      exp.export(new Tester(exp, null));
      throw new RuntimeException("server auth req did not cause EE");
  } catch (ExportException e) {
  }
  final Uuid oid = UuidFactory.generate();
  exp = new BasicJeriExporter(se, uilf, false, false, oid);
  compare(exp, se, uilf, false, false, oid);
  compare(new BasicJeriExporter(se, uilf, false, true, oid),
    se, uilf, false, true, oid);
  compare(new BasicJeriExporter(se, uilf, true, false, oid),

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    Target get(Uuid id) {
            return idTable.get(id);
    }


    void put(Target target) throws ExportException {
        Uuid id = target.getObjectIdentifier();
        if (id.equals(Jeri.DGC_ID)) {
            throw new ExportException(
                "object identifier reserved for DGC");
        }
        Target exists = idTable.putIfAbsent(id, target);
        if (exists != null){

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            dgcEnabledCount.incrementAndGet();
        }
    }


    void remove(Target target, boolean gc) {
            Uuid id = target.getObjectIdentifier();
            boolean removed = idTable.remove(id, target);
            if (target.getEnableDGC() && removed) {
                int count = dgcEnabledCount.decrementAndGet();
                assert count >= 0;
            }

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    }


    public void dispatch(InboundRequest request) {
        try {
            InputStream in = request.getRequestInputStream();
            Uuid id = UuidFactory.read(in);
            Target target = null;
            if (logger.isLoggable(Level.FINEST)) {
                logger.log(Level.FINEST, "id={0}", id);
            }


            try {
                /*
                 * The DGC object identifier is hardwired here,
                 * rather than install it in idTable; this
                 * eliminates the need to worry about not counting
                 * the DGC server as an exported object in the
                 * table, and it doesn't need all of the machinery
                 * that Target provides.
                 */
                if (id.equals(Jeri.DGC_ID)) {
                    dispatchDgcRequest(request);
                    return;
                }


                target = get(id);

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    private byte[]  cookie;
    private long  expiration;


    Resource(StorableResource resource) {
  super(resource);
  final Uuid uuid = resource.getCookie();
  cookie = ByteArrayWrapper.toByteArray(uuid);
  expiration = resource.getExpiration();
    }

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  leaseToRenew = (Lease) leasePreparer.prepareProxy(leaseToRenew);


  // Ensure that the lease is not a current lease granted by this server
  if (leaseToRenew instanceof ReferentUuid) {
      Uuid cookie = ((ReferentUuid) leaseToRenew).getReferentUuid();
      LeaseSet setForLease = (LeaseSet) setTable.get(cookie);
      if (setForLease != null) {
    synchronized (setForLease) {
        if (isCurrent(setForLease)) {
      throw new IllegalArgumentException(

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    // Methods defined in LeaseRenewalService


    // Inherit java doc from super type
    public LeaseRenewalSet createLeaseRenewalSet(long leaseDuration) {
  ready.check();
  final Uuid newID      = UuidFactory.generate();
  final LeaseSet newSet = new LeaseSet(newID, generator, store, this);
  
  LeasePeriodPolicy.Result leasePeriod;
  try {
      leasePeriod = setLeasePolicy.grant(newSet, leaseDuration);

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  }
  if (obj == null || ctx == null) {
      throw new NullPointerException("Arguments must not be null");
  }
  RemoteMethodControl otherServerProxy;
  Uuid inputProxyID = null;
  if (obj instanceof TxnMgrProxy.ConstrainableTxnMgrProxy) {
      otherServerProxy = (RemoteMethodControl) 
    ((TxnMgrProxy)obj).backend;
      inputProxyID = ((ReferentUuid)obj).getReferentUuid();
  } else if (obj instanceof ConstrainableLandlordLease) {

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    }


    public void run() {
  while (!dead) { // ok not to lock since it starts false
      try {
    final Uuid cookie;
    synchronized (this) { 
        while (!dead && queue.isEmpty()) {
      wait();
        }

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