// generatorId must be unique over all your instances!
int generatorId = 0; 

// use default generator settings
SnowflakeIdGenerator generator = SnowflakeIdGenerator.createDefault(generatorId);

// generate 10 ids
for (int i = 0; i < 10; i++) {
    long id = generator.next();
    System.out.println(id);
}

// Use a custom epoch
TimeSource timeSource = new MonotonicTimeSource(Instant.parse("2020-04-01T00:00:00Z"));
// Use 45 bits for the timestamp, 2 bits for the generator and 16 bits for the sequence
Structure structure = new Structure(45, 2, 16);
// If the sequence number overflows, throw an exception
Options options = new Options(Options.SequenceOverflowStrategy.THROW_EXCEPTION);

// generatorId must be unique over all your instances!
long generatorId = 1;
SnowflakeIdGenerator generator = SnowflakeIdGenerator.createCustom(generatorId, timeSource, structure, options);

// generate 10 ids
for (int i = 0; i < 10; i++) {
    long id = generator.next();
    System.out.println(id);
}

TimeSource timeSource = new MonotonicTimeSource(Instant.parse("2020-04-01T00:00:00Z"));

Structure structure = new Structure(45, 2, 16);
System.out.println("Max generators: " + structure.maxGenerators());
System.out.println("Max sequences per ms per generator: " + structure.maxSequenceIds());
System.out.println("Max sequences per ms total: " + structure.maxSequenceIds() * structure.maxGenerators());
System.out.println("Wraparound duration: " + structure.calculateWraparoundDuration(timeSource));
System.out.println("Wraparound date: " + structure.calculateWraparoundDate(timeSource));