Node Async lock (异步锁)

a simple node async lock that support ttl base memory database such as redis.

install

1npm install node-async-lock

usage

node_redis demo :

1var redis = require("redis"),
2  client = redis.createClient(6379,'localhost');
3
4var ASYNCLOCK = require('node-async-lock');
5var AsyncLock = new ASYNCLOCK({
6  set:function(key,data,ttl,callback){
7    client.set(key,data,function(err,reply){
8      callback(err,reply.toString());
9    });
10    client.expire(key,ttl);
11  },
12  get:function(key,callback){
13    client.get(key,function(err,reply){
14      callback(err,reply.toString());
15    });
16  },
17  remove:function(key,callback){
18    client.del(key,function(err){
19      callback(err);
20    })    
21  },
22  ttl:60, //the unit is second,defualt one day.
23  namespace:'test-asynclock-ttl-' //default:async-lock-ttl-
24});
25
26eg1:
27
28function testLock(cb){
29	AsyncLock.lock('buy',2,function(err,data){
30		cb(err,data);
31	})
32}
33
34eg2:
35
36function testLock(cb){
37	AsyncLock.lock('pay',2,function(err,data){
38		if(!err){
39			//todo your code.
40			AsyncLock.unlock('pay',function(err,data){
41				cb(err,data);
42			})						
43		}else{
44			cb(err,data);
45		}
46	})
47}

API

• lock

• unlock

• remove

• getNameSpace

1AsyncLock.lock('test-redis',10,function(err,data){
2  console.log(err,data);
3})

1AsyncLock.unlock('test-redis',function(err,data){
2  console.log(err,data);
3})

1AsyncLock.remove('test-redis',function(err,data){
2  console.log(err);
3})

1console.log(AsyncLock.getNameSpace());//test-asynclock-ttl