Enumeration gen

Example: Update record, only if generation matches

const Aerospike = require('aerospike')
const key = new Aerospike.Key('test', 'test', 'myKey')
// INSERT HOSTNAME AND PORT NUMBER OF AEROSPIKE SERVER NODE HERE!
var config = {
  hosts: '192.168.33.10:3000',
  // Timeouts disabled, latency dependent on server location. Configure as needed.
  policies: {
    write : new Aerospike.WritePolicy({socketTimeout : 0, totalTimeout : 0})
  }
}
Aerospike.connect(config).then(async (client) => {
  await client.put(key, { foo: 'bar' })

  const record = await client.get(key)
  const gen = record.gen // Current generation of the record. (1 for new record.)
  // Perform some command using record. Some other process might update the
  // record in the meantime, which would change the generation value.
  if (Math.random() < 0.1) await client.put(key, { foo: 'fox' })

  try {
    // Update record only if generation is still the same.
    const meta = { gen }
    const policy = { gen: Aerospike.policy.gen.EQ }
    await client.put(key, { status: 'updated' }, meta, policy)
    console.log('Record updated successfully.')
  } catch (error) {
    if (error.code == Aerospike.status.ERR_RECORD_GENERATION) {
      console.error('Failed to update record, because generation did not match.')
    }
  }

  client.close()
})
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