[gem] Configuration layer

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
+## [Unreleased]
+- configuration layer `AnyCache.configure`: an ability to choose and configure a necessary cache client
+  without any explicit client object instantiation (client object will be instantiated implicitly);
+
 ## [0.1.0] - 2018-08-26
 - Release :)

README.md

@@ -35,7 +35,17 @@ require 'any_cache'
 ## Usage / Table of Contents
 
 - [Creation](#creation)
-- **Operations**
+    - [Manual creation](#manual-creation)
+    - [Config-based creation](#config-based-creation)
+        - [AnyCache with Redis](#anycache-with-redis)
+        - [AnyCache with Redis::Store](#anycache-with-redisstore)
+        - [AnyCache with Dalli::Client](#anycache-with-dalliclient)
+        - [AnyCache with ActiveSupport::Cache::FileStore](#anycache-with-activesupportcachefilestore)
+        - [AnyCache with ActiveSupport::Cache::MemoryStore](#anycache-with-activesupportcachememorystore)
+        - [AnyCache with ActiveSupport::Cache::RedisCacheStore](#anycache-with-activesupportcacherediscachestore)
+    - [Many cache storages](#many-cache-storages)
+    - [Custom cache clients](#custom-cache-clients)
+- [Operations](#operations)
     - [Read](#read)
     - [Write](#write)
     - [Delete](#delete)
@@ -51,6 +61,7 @@ require 'any_cache'
 
 To instantiate AnyCache instance you have to provide a client.
 Client - an independent driver that works with a corresponding cache storage (external dependency).
+
 Supported clients:
 
 - `Redis`
@@ -60,7 +71,14 @@ Supported clients:
 - `ActiveSupport::Cache::FileStore`
 - `ActiveSupport::Cache::MemoryStore`
 
-`AnyCache` instantiation:
+`AnyCache` can be instantiated by two ways:
+
+- with explicit client object instantiated manually;
+- via configuration;
+
+#### Manual creation
+
+Custom instantiation with explicit client objects:
 
 ```ruby
 # 1) create client object
@@ -80,6 +98,114 @@ client = ActiveSupport::Cache::MemoryStore.new(...)
 any_cache = AnyCache.build(client) # => <AnyCache:0x00007f990527f268 ...>
 ```
 
+#### Config-based creation
+
+You can configure `AnyCache` globally or create subclasses and configure each of them. After that
+storage instantiation works via `.build` method without explicit attributes.
+
+- `AnyCache.configure` is used for configuration;
+- `config.driver` is used for determine which client should be used;
+- `config.__driver_name__.options` stores client-related options;
+
+Supported drivers:
+
+- `:redis` - Redis;
+- `:redis_tore` - Redis::Client;
+- `:dalli` - Dalli::Client
+- `:as_redis_cache_store` - ActiveSupport::Cache::RedisCacheStore;
+- `:as_file_store` - ActiveSupport::Cache::FileStore;
+- `:as_memory_store` - ActiveSupport::Cache::MemoryStore;
+
+##### `AnyCache` with `Redis`:
+
+```ruby
+AnyCache.configure do |conf|
+  conf.driver = :redis
+  conf.redis.options = { ... } # Redis-related options
+end
+
+AnyCache.build
+```
+
+##### `AnyCache` with `Redis::Store`:
+
+```ruby
+AnyCache.configure do |conf|
+  conf.driver = :redis_store
+  conf.redis_store.options = { ... } # Redis::Store-related options
+end
+
+AnyCache.build
+```
+
+##### `AnyCache` with `Dalli::Client`:
+
+```ruby
+AnyCache.configure do |conf|
+  conf.driver = :dalli
+  conf.dalli.options = { ... } # Dalli::Client-related options
+end
+
+AnyCache.build
+```
+
+##### `AnyCache` with `ActiveSupport::Cache::FileStore`:
+
+```ruby
+AnyCache.configure do |conf|
+  conf.driver = :as_file_store
+  conf.as_file_store.cache_path = '/path/to/cache'
+  conf.as_file_store.options = { ... } # ActiveSupport::Cache::FileStore-related options
+end
+
+AnyCache.build
+```
+
+##### `AnyCache` with `ActiveSupport::Cache::MemoryStore`:
+
+```ruby
+AnyCache.configure do |conf|
+  conf.driver = :as_memory_store
+  conf.as_memory_store.options = { ... } # ActiveSupport::Cache::MemoryStore-related options
+end
+
+AnyCache.build
+```
+
+##### `AnyCache` with `ActiveSupport::Cache::RedisCacheStore`:
+
+```ruby
+AnyCache.configure do |conf|
+  conf.driver = :as_redis_cache_store
+  conf.as_redis_cache_store.options = { ... } # ActiveSupport::Cache::RedisCacheStore-related options
+end
+
+AnyCache.build
+```
+
+#### Many cache storages
+
+You can inherit `AnyCache` class and create and configure as many cache storages as you want:
+
+```ruby
+class RedisCache < AnyCache
+  configure do |conf|
+    conf.driver = :redis
+  end
+end
+
+class DalliCache < AnyCache
+  configure do |conf|
+    conf.driver = :dalli
+  end
+end
+
+redis_cache = RedisCache.build
+dalli_cache = DalliCache.build
+```
+
+#### Custom cache clients
+
 If you want to use your own cache client implementation, you should provide an object that responds to:
 
 - `#read(key, [**options])` ([doc](#read))
@@ -91,6 +217,37 @@ If you want to use your own cache client implementation, you should provide an o
 - `#persist(key, [**options])` ([doc](#persist))
 - `#clear([**options])` ([doc](#clear))
 
+```ruby
+class MyCacheClient
+  # ...
+
+  def read
+    # ...
+  end
+
+  def write
+    # ...
+  end
+
+  # ...
+end
+
+AnyCache.build(MyCacheClient.new)
+```
+
+## Operations
+
+`AnyCache` provides a following operation set:
+
+- [read](#read)
+- [write](#write)
+- [delete](#delete)
+- [increment](#increment)
+- [decrement](#decrement)
+- [expire](#expire)
+- [persist](#persist)
+- [clear](#clear)
+
 ---
 
 ### Read

any_cache.gemspec

@@ -27,13 +27,13 @@ Gem::Specification.new do |spec|
     `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(spec|features)/}) }
   end
 
-  spec.add_dependency 'concurrent-ruby', '~> 1.0'
+  spec.add_dependency 'concurrent-ruby',    '~> 1.0'
+  spec.add_development_dependency 'qonfig', '~> 0.6'
 
   spec.add_development_dependency 'coveralls',        '~> 0.8'
   spec.add_development_dependency 'simplecov',        '~> 0.16'
   spec.add_development_dependency 'armitage-rubocop', '~> 0.6'
   spec.add_development_dependency 'rspec',            '~> 3.8'
-  spec.add_development_dependency 'qonfig',           '~> 0.6'
 
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'rake'

bin/rspec

@@ -8,10 +8,7 @@ module AnyCacheSpecRunner
   extend self
 
   def expand_gemfile_path(gemfile_name)
-    File.expand_path(
-      File.join('..', '..', 'gemfiles', gemfile_name),
-      Pathname.new(__FILE__).realpath
-    )
+    File.expand_path(File.join('..', 'gemfiles', gemfile_name), __dir__)
   end
 
   GEMFILES = {

lib/any_cache.rb

@@ -1,24 +1,60 @@
 # frozen_string_literal: true
 
+require 'qonfig'
 require 'securerandom'
 require 'concurrent/atomic/reentrant_read_write_lock'
 
 # @api public
 # @since 0.1.0
 class AnyCache
   require_relative 'any_cache/version'
+  require_relative 'any_cache/drivers'
   require_relative 'any_cache/adapters'
 
   # @since 0.1.0
   extend Forwardable
 
+  # @since 0.2.0
+  include Qonfig::Configurable
+
+  # @since 0.2.0
+  configuration do
+    setting :driver
+
+    setting :redis do
+      setting :options, {}
+    end
+
+    setting :redis_store do
+      setting :options, {}
+    end
+
+    setting :dalli do
+      setting :servers, nil
+      setting :options, {}
+    end
+
+    setting :as_file_store do
+      setting :cache_path
+      setting :options, {}
+    end
+
+    setting :as_memory_store do
+      setting :options, {}
+    end
+
+    setting :as_redis_cache_store do
+      setting :options, {}
+    end
+  end
+
   class << self
     # @param driver [Object]
     # @return [AnyCache]
     #
     # @api private
     # @since 0.1.0
-    def build(driver)
+    def build(driver = Drivers.build(config))
       new(Adapters.build(driver))
     end
   end

lib/any_cache/adapters/active_support_file_store.rb

@@ -18,8 +18,7 @@ class << self
       # @api private
       # @since 0.1.0
       def supported_driver?(driver)
-        defined?(::ActiveSupport::Cache::FileStore) &&
-        driver.is_a?(::ActiveSupport::Cache::FileStore)
+        AnyCache::Drivers::ActiveSupportFileStore.supported_source?(driver)
       end
     end
   end

lib/any_cache/adapters/active_support_memory_store.rb

@@ -18,8 +18,7 @@ class << self
       # @api private
       # @since 0.1.0
       def supported_driver?(driver)
-        defined?(::ActiveSupport::Cache::MemoryStore) &&
-        driver.is_a?(::ActiveSupport::Cache::MemoryStore)
+        AnyCache::Drivers::ActiveSupportMemoryStore.supported_source?(driver)
       end
     end
   end

lib/any_cache/adapters/active_support_redis_cache_store.rb

@@ -13,9 +13,7 @@ class << self
       # @api private
       # @since 0.1.0
       def supported_driver?(driver)
-        defined?(::Redis) &&
-        defined?(::ActiveSupport::Cache::RedisCacheStore) &&
-        driver.is_a?(::ActiveSupport::Cache::RedisCacheStore)
+        AnyCache::Drivers::ActiveSupportRedisCacheStore.supported_source?(driver)
       end
     end
 

lib/any_cache/adapters/dalli.rb

@@ -11,7 +11,7 @@ class << self
       # @api private
       # @since 0.1.0
       def supported_driver?(driver)
-        defined?(::Dalli::Client) && driver.is_a?(::Dalli::Client)
+        AnyCache::Drivers::Dalli.supported_source?(driver)
       end
     end
 

lib/any_cache/adapters/redis.rb

@@ -11,7 +11,7 @@ class << self
       # @api private
       # @since 0.1.0
       def supported_driver?(driver)
-        defined?(::Redis) && driver.is_a?(::Redis)
+        AnyCache::Drivers::Redis.supported_source?(driver)
       end
     end
 

lib/any_cache/adapters/redis_store.rb

@@ -11,7 +11,7 @@ class << self
       # @api private
       # @since 0.1.0
       def supported_driver?(driver)
-        defined?(::Redis::Store) && driver.is_a?(::Redis::Store)
+        AnyCache::Drivers::RedisStore.supported_source?(driver)
       end
     end
 

lib/any_cache/drivers.rb

@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+# @api private
+# @since 0.2.0
+module AnyCache::Drivers
+  require_relative 'drivers/dalli'
+  require_relative 'drivers/redis'
+  require_relative 'drivers/redis_store'
+  require_relative 'drivers/active_support_file_store'
+  require_relative 'drivers/active_support_memory_store'
+  require_relative 'drivers/active_support_redis_cache_store'
+
+  class << self
+    # @param config [Qonfig::DataSet]
+    # @return [Object]
+    #
+    # @raise [AnyCache::UnsupportedDriverError]
+    #
+    # @api private
+    # @since 0.2.0
+    def build(config)
+      driver = config[:driver]
+
+      case driver
+      when :redis
+        Redis.build(config[:redis])
+      when :redis_store
+        RedisStore.build(config[:redis_store])
+      when :dalli
+        Dalli.build(config[:dalli])
+      when :as_file_store
+        ActiveSupportFileStore.build(config[:as_file_store])
+      when :as_memory_store
+        ActiveSupportMemoryStore.build(config[:as_memory_store])
+      when :as_redis_cache_store
+        ActiveSupportRedisCacheStore.build(config[:as_redis_cache_store])
+      else
+        raise AnyCache::UnsupportedDriverError
+      end
+    end
+  end
+end