Examples of com.hazelcast.core.IdGenerator.newId()

com.hazelcast.core.IdGenerator.newId()
Generates and returns cluster-wide unique id. Generated ids are guaranteed to be unique for the entire cluster as long as the cluster is live. If the cluster restarts then id generation will start from 0. @return cluster-wide new unique id

    private static void assertNewIdAfterInit(int initialValue) {
        IdGenerator idGenerator = createIdGenerator();


        assertTrue(idGenerator.init(initialValue));


        assertEquals(initialValue + 1, idGenerator.newId());
    }


    private static IdGenerator createIdGenerator() {
        String name = "id-" + UUID.randomUUID().toString();

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    public void testIdGenerator() throws Exception {
        String partitionKey = "hazelcast";
        HazelcastInstance hz = getHazelcastInstance(partitionKey);


        IdGenerator idGenerator = hz.getIdGenerator("idgenerator@" + partitionKey);
        idGenerator.newId();
        assertEquals("idgenerator@" + partitionKey, idGenerator.getName());
        assertEquals(partitionKey, idGenerator.getPartitionKey());


        AtomicLongService service = getNodeEngine(hz).getService(AtomicLongService.SERVICE_NAME);
        assertTrue(service.containsAtomicLong("hz:atomic:idGenerator:" + idGenerator.getName()));

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   * Id from Hazelcast. In this way if the Hazelcast counter is restarted (for example after a cluster shutdown or
   * restart) then the Ids will still be unique afterwards.
   */
  public long uniqueVersionId() {
    IdGenerator idGenerator = hz.getIdGenerator(CoordinationStructures.VERSION_GENERATOR);
    long id = idGenerator.newId();
    int timeSeconds = (int) (System.currentTimeMillis() / 1000);
    long paddedId = id << 32;
    return paddedId + timeSeconds;
  }

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