Distributed lock of Hazelcast using nodejs - node.js

Question

I have the Hazelcast cluster server running in the 172.30.56.60, 61, 62
(i.e)
[ Member {
address: Address { host: '172.30.56.60', port: 5701, type: 4 },
uuid: 'bd6428f0-e888-453f-872f-6fe8296d751d',
isLiteMember: false,
attributes: {} },
Member {
address: Address { host: '172.30.56.61', port: 5701, type: 4 },
uuid: 'e0cd795a-0ca5-41ab-907a-492b61690a18',
isLiteMember: false,
attributes: {} },
Member {
address: Address { host: '172.30.56.62', port: 5701, type: 4 },
uuid: '0a834ae8-e707-4b5b-945b-362bfea08cf5',
isLiteMember: false,
attributes: {} } ]
I try to implement the Hazelcast distributed locking using nodejs using the following code,
// Initialize the hazelcast client instance.
var HazelcastClient = require('hazelcast-client').Client;
var Config = require('hazelcast-client').Config;
var config = new Config.ClientConfig();
config.networkConfig.addresses = [{host: '172.30.56.60', port: '5701'},{host: '172.30.56.61', port: '5701'}, {host: '172.30.56.62', port: '5701'}];
var lock = {};
var sleep = require('sleep');
HazelcastClient
.newHazelcastClient(config)
.then(function (hazelcastClient) {
lock = hazelcastClient.getLock("lock1");
// do stuff with lock
lock.lock();
console.log('Am locked in node with lock1...will be locked for 20 seconds');
sleep.sleep(20);
console.log('Unlocked now...');
lock.unlock();
process.exit();
});
I started the script node by node, I expected to establish the lock node by node, but instead it locks all the nodes in the same time. So it is not working as a distributed lock, so all the script started and ending in the same time (NOTE : For testing I provided 20 seconds sleep)
Please let me know, How to establish the distributed lock using node js in Hazelcast.

Answer 1

I found the answer myself, I didn't realize the return of promise, my bad (new to nodejs)
// Initialize the hazelcast client instance.
var HazelcastClient = require('hazelcast-client').Client;
var Config = require('hazelcast-client').Config;
var config = new Config.ClientConfig();
config.networkConfig.addresses = [{host: '172.30.56.60', port: '5701'},{host: '172.30.56.61', port: '5701'}, {host: '172.30.56.62', port: '5701'}];
var sleep = require('sleep');
// Test process
HazelcastClient
.newHazelcastClient(config)
.then(function (hazelcastClient) {
var lock = hazelcastClient.getLock('rowId_tablename');
// lock the code here
lock.lock().then(function() {
console.log('Am locked in node with lock3...will be locked for 20 seconds');
sleep.sleep(20);
// unlock after process
return lock.unlock();
}).then(function() {
console.log('unlocked now');
});
});