Results for ordered-locks

Compiletime deadlock avoidance

Deadlock-free locks for Rust with compile time guarantees, incremental locks, and atomic lock sets.

This gem remove the overhead of monkeypatching your Gemfile in order to dualboot your app using the Gemfile_next lock strategy It also ensure that dependencies in the Gemfile lock and Gemfile_next lock are in sync whenever someone updates a gem

|> Distributed locks with "prioritized lock acquisition queue" capabilities based on the Redis Database. |> Each lock request is put into the request queue (each lock is hosted by its own queue separately from other queues) and processed in order of their priority (FIFO). |> Each lock request lives some period of time (RTTL) (with requeue capabilities) which guarantees the request queue will never be stacked. |> In addition to the classic `queued` (FIFO) strategy RQL supports `random` (RANDOM) lock obtaining strategy when any acquirer from the lock queue can obtain the lock regardless the position in the queue. |> Provides flexible invocation flow, parametrized limits (lock request ttl, lock ttl, queue ttl, lock attempts limit, fast failing, etc), logging and instrumentation.

Adds pessimistic locking capabilities to the redis gem. Since these capabilities are utilized client-side, all clients must use this gem and follow the order of lock => make changes => unlock in order to obtain maximum safety when modifying sensitive keys. Tested with redis-server 2.0.4 and should work with all versions > 0.091.

Chef-Berksfile-Env ================== A Chef plugin which allows you to lock down your Chef Environment's cookbook versions with a Berksfile. This is effectively the same as doing `berks apply ...` but via `knife environment from file ...`. View the [Change Log](https://github.com/bbaugher/chef-berksfile-env/blob/master/CHANGELOG.md) to see what has changed. Installation ------------ /opt/chef/embedded/bin/gem install chef-berksfile-env Usage ----- In your chef repo create a Berksfile next to your Chef environment file like this, chef-repo/environments/[ENV_NAME]/Berksfile This is the default location that will used by the plugin. We have to put the Berksfile in its own directory since [multiple Berksfiles can't exist in the same directory](https://github.com/berkshelf/berkshelf/issues/1247). The berksfile should include any cookbooks that your nodes or roles explicitly mention for that environment, source "https://supermarket.getchef.com" cookbook "java" cookbook "yum", "~> 2.0" ... Next we need to generate our Berksfile's lock file, berks install Your environment file must by in `.rb` format and look like this, require 'chef-berksfile-env' # The name must be defined first so we can use it to find the Berksfile name "my_env" # Load Berksfile locked dependencies as my environment's cookbook version contraints load_berksfile ... Now our environment will use the locked versions of the cookbooks and transitive dependencies generated by our Berksfile. Upgrading to the latest dependecies is now as simple as, berks install Our Berksfile also provides an easy way to ensure all the cookbooks and their versions that our environment requires are uploaded to our chef-server, berks upload How the Plugin Finds the Berksfile ---------------------------------- If you are curious how the plugin knows to find the Berksfile in `chef-repo/environments/[ENV]/Berksfile`, you want to put your Berksfile somewhere else or you have run into this error `Expected Berksfile at [/path/../Berksfile] but does not exist`, this section will explain how this works and ways to tweak the path or fix your error. `load_berksfile` has an optional argument which represents the path to your Berksfile. This path can be pseduo relative (explained in a moment) or absolute. By default the value is `environments/[ENV_NAME]/Berksfile`. By pseduo relative I mean that its a relative path but the plugin will check to see if the directory we are executing from partially matches our relative path. So if we are running knife from `/home/chef-repo/environments` and our relative path is `chef-repo/environments/dev/Berksfile` the plugin will see that the relative path is partially included in our execution directory and will attempt to merge the two to come up with `/home/chef-repo/environments/dev/Berksfile`. If we can't make any match at all we attempt to guess the path by just joining the relative path with our execution directory. So why do we do this? Well the only way to use this plugin is if your environment is in Ruby format. Chef's `knife from file ...` uses Ruby's `instance_eval` in order to do this. This means the code on Chef's end effectively looks like this, env.instance_eval(IO.read(env_ruby_file)) which means that any context about the location of the environment file is lost. So we have no great way to discern the location of our environment Ruby file, so instead we guess.