This commit is contained in:
Dominic Grimm 2022-02-13 20:59:26 +01:00
commit 5fd6457c7a
7 changed files with 247 additions and 0 deletions

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.editorconfig Normal file
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root = true
[*.cr]
charset = utf-8
end_of_line = lf
insert_final_newline = true
indent_style = space
indent_size = 2
trim_trailing_whitespace = true

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.gitignore vendored Normal file
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/docs/
/lib/
/bin/
/.shards/
*.dwarf
# Libraries don't need dependency lock
# Dependencies will be locked in applications that use them
/shard.lock

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MIT License
Copyright (c) 2022 Dominic Grimm <dominic.grimm@gmail.com>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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README.md Normal file
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# service
TODO: Write a description here
## Installation
1. Add the dependency to your `shard.yml`:
```yaml
dependencies:
service:
git: https://git.dergrimm.net/dergrimm/service.git
```
2. Run `shards install`
## Usage
```crystal
require "service"
```
TODO: Write usage instructions here
## Development
TODO: Write development instructions here
## Contributing
1. Fork it
2. Create your feature branch (`git checkout -b my-new-feature`)
3. Commit your changes (`git commit -am 'Add some feature'`)
4. Push to the branch (`git push origin my-new-feature`)
5. Create a new Pull Request
## Contributors
- [Dominic Grimm](https://git.dergrimm.net/dergrimm) - creator and maintainer

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examples/example.cr Normal file
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require "../src/service"
require "log"
class MessageService < Service
Log = ::Log.for(self)
@@i = 0
getter message
getter delay
getter times
def initialize(@message : String, @delay : Int32, @times : Int32)
end
def run(_unit : Unit) : Service::Unit?
puts @message
@@i += 1
Log.info { @@i }
sleep @delay
if @@i < @times
Service::Unit.new(self)
else
Log.info { "Done." }
nil
end
end
end
class Runner < Service::Runner
def starters : Array(Service::Starter)
[
Service::AsynchronousStarter.new([
MessageService.new("Hello world from AsynchronousStarter!", delay: 1, times: 5).as(Service),
]).as(Service::Starter),
]
end
end
Runner.new.run

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shard.yml Normal file
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name: service
version: 0.1.0
authors:
- Dominic Grimm <dominic.grimm@gmail.com>
crystal: 1.3.2
license: MIT
dependencies:
version_from_shard:
github: hugopl/version_from_shard

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src/service.cr Normal file
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require "version_from_shard"
abstract class Service
VersionFromShard.declare
abstract def run(unit : Unit) : Unit?
def handle(unit : Unit?) : Unit?
if unit
unit.handle(self)
end
end
class Unit
property service
property handler_proc
alias Handler = (self, Service) -> Unit?
DEFAULT_HANLDER = ->(unit : self, service : Service) { service.run(unit).as(Unit?) }
NO_RESTART_HANDLER = ->(_unit : self, _service : Service) { nil }
def initialize(@service : Service, @handler_proc : Handler = DEFAULT_HANLDER)
end
def initialize(service : Service, &handler_proc : Handler)
initialize(service, handler_proc)
end
def handle(service : Service) : Unit?
handler_proc.call(self, service)
end
end
abstract class Starter
abstract def logic : Array(Service)
abstract def start : self
def self.handle(service : Service) : Nil
unit = service.run(Unit.new(service))
if unit
while unit = service.handle(unit.not_nil!)
end
end
end
end
abstract class ArrayStarter < Starter
getter services
def initialize(@services : Array(Service))
end
def logic : Array(Service)
@services
end
end
class SynchronousStarter < ArrayStarter
def start : self
l = logic
channel = Channel(Nil).new(l.size)
logic.each do |service|
spawn do
Starter.handle(service)
channel.send(nil)
end
end
l.size.times do
channel.receive
end
Fiber.yield
self
end
end
class AsynchronousStarter < ArrayStarter
def start : self
logic.each do |service|
Starter.handle(service)
end
self
end
end
abstract class Runner
Log = Log.for(self)
abstract def starters : Array(Starter)
def run : self
s = starters
channel = Channel(Nil).new(s.size)
s.each do |starter|
spawn do
starter.start
channel.send(nil)
end
end
s.size.times do
channel.receive
end
Fiber.yield
self
end
end
end