https://github.com/yehohanan7/glock

Optimistic lock using persistent stores
https://github.com/yehohanan7/glock

cassandra consensus optimistic-locking optimisticlock

Last synced: about 2 months ago
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Optimistic lock using persistent stores

• Host: GitHub
• URL: https://github.com/yehohanan7/glock
• Owner: yehohanan7
• Created: 2017-11-07T16:52:05.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2017-11-10T16:37:48.000Z (over 8 years ago)
• Last Synced: 2025-06-25T02:44:14.783Z (about 1 year ago)
• Topics: cassandra, consensus, optimistic-locking, optimisticlock
• Language: Go
• Homepage:
• Size: 19.5 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# Glock [![Build Status](https://travis-ci.org/yehohanan7/glock.svg)](https://travis-ci.org/yehohanan7/glock?branch=master) [![Go Report Card](https://goreportcard.com/badge/github.com/yehohanan7/glock)](https://goreportcard.com/report/github.com/yehohanan7/glock)

## Introduction

Glock is used to achieve consensus between different hosts using a persistent stores.

### Glock with Cassandra

The cassandra implementation is based on the article here: https://www.datastax.com/dev/blog/consensus-on-cassandra

#### Setup

```bash

CREATE KEYSPACE test WITH REPLICATION = { 'class' : 'SimpleStrategy', 'replication_factor': 1};

CREATE TABLE test.lock (id text, owner text, PRIMARY KEY (id)) WITH default_time_to_live = 5;

```

#### Glock example

```go

import (

	"github.com/gocql/gocql"

	"github.com/yehohanan7/glock"

)

session := //initialize a cassandra session using gocql

config := glock.Config{

	"host1",

	time.NewTicker(2 * time.Second),

	glock.NewCassandraStore(session),

	notifyCh,

	stopCh,

}

go glock.Start(config)

for {

	select {

	case state := <-notifyCh:

		if state == "master" {

			fmt.Println("became master")

		}

		if state == "slave" {

			fmt.Println("became slave")

		}

	}

}

```