Contents

# Zhong

Useful, reliable distributed cron. Tired of your cron-like scheduler running key jobs twice? Would you like to be able to run your cron server on multiple machines and have it "just work"? Have we got the gem for you.

Zhong uses Redis to acquire exclusive locks on jobs, as well as recording when they last ran. This means that you can rest easy at night, knowing that your customers are getting their monthly Goat Fancy magazine subscriptions and you are rolling around in your piles of money without a care in the world.

# Installation

Add this line to your application’s Gemfile:

```ruby
gem 'zhong'
```

## Usage

```ruby
r = Redis.new

Zhong.schedule(redis: r) do |s|
  s.category "stuff" do
    s.every(5.seconds, "foo") { puts "foo" }
    s.every(1.minute, "biz", at: ["**:26", "**:27"]) { puts "biz" }
    s.every(1.week, "baz", at: ["mon 22:45", "wed 23:13"]) { puts "baz" }
    s.every(10.seconds, "boom") { raise "fail" }
  end

  s.category "clutter" do
    s.every(1.second, "compute", if: -> (t) { t.wday == 3 && rand < 0.5 }) do
      puts "something happened on wednesday, maybe"
    end
  end

  # note: callbacks that return nil or false will cause event to not run
  s.on(:before_tick) do
    puts "ding"
    true
  end

  s.on(:after_tick) do
    puts "dong"
    true
  end

  s.error_handler do |e, job|
    puts "damn, #{job} messed up: #{e}"
  end
end
```

## TODO
 - better logging
 - error handling
 - tests
 - examples
 - callbacks
 - generic handler

## History

View the [changelog](https://github.com/nickelser/zhong/blob/master/CHANGELOG.md).

## Contributing

Everyone is encouraged to help improve this project. Here are a few ways you can help:

- [Report bugs](https://github.com/nickelser/zhong/issues)
- Fix bugs and [submit pull requests](https://github.com/nickelser/zhong/pulls)
- Write, clarify, or fix documentation
- Suggest or add new features

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
zhong-0.1.4	README.md
zhong-0.1.3	README.md