Added multi process support (share updated settings over multiple processes).
This commit is contained in:
Martin Edenhofer
parent
427b8e9fbd
commit
ab0a02c09d
1 changed files with 104 additions and 40 deletions
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@ -7,15 +7,75 @@ class Setting < ApplicationModel
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store :preferences
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before_create :state_check, :set_initial
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before_update :state_check
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after_create :delete_cache
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after_update :delete_cache
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after_create :reset_cache
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after_update :reset_cache
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after_destroy :reset_cache
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@@current = {} # rubocop:disable Style/ClassVars
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@@current = {} # rubocop:disable Style/ClassVars
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@@change_id = nil # rubocop:disable Style/ClassVars
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@@lookup_at = nil # rubocop:disable Style/ClassVars
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@@lookup_timeout = 2.minutes # rubocop:disable Style/ClassVars
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=begin
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set config setting
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Setting.set('some_config_name', some_value)
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=end
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def self.set(name, value)
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setting = Setting.find_by( name: name )
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if !setting
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fail "Can't find config setting '#{name}'"
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end
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setting.state = { value: value }
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setting.save
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logger.info "Setting.set(#{name}, #{value.inspect})"
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end
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=begin
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get config setting
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value = Setting.get('some_config_name')
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=end
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def self.get(name)
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load
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@@current[:settings_config][name]
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end
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=begin
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reset config setting to default
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Setting.reset('some_config_name')
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=end
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def self.reset(name)
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setting = Setting.find_by( name: name )
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if !setting
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fail "Can't find config setting '#{name}'"
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end
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setting.state = setting.state_initial
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setting.save
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logger.info "Setting.reset(#{name}, #{setting.state.inspect})"
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load
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@@current[:settings_config][name]
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end
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private
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# load values and cache them
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def self.load
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# check if config is already generated
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return @@current[:settings_config] if @@current[:settings_config]
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if @@current[:settings_config]
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return @@current[:settings_config] if cache_valid?
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end
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# read all config settings
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config = {}
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@ -33,52 +93,56 @@ class Setting < ApplicationModel
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}
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# store for class requests
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@@current[:settings_config] = config
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cache(config)
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config
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end
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def self.set(name, value)
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setting = Setting.find_by( name: name )
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if !setting
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fail "Can't find config setting '#{name}'"
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end
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setting.state = { value: value }
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setting.save
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logger.info "Setting.set() name:#{name}, value:#{value.inspect}"
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end
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def self.get(name)
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load
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@@current[:settings_config][name]
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end
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def self.reset(name)
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setting = Setting.find_by( name: name )
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if !setting
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fail "Can't find config setting '#{name}'"
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end
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setting.state = setting.state_initial
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setting.save
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logger.info "Setting.reset() name:#{name}, value:#{setting.state.inspect}"
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load
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@@current[:settings_config][name]
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end
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private
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def delete_cache
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@@current[:settings_config] = nil
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end
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# set initial value in state_initial
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def set_initial
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self.state_initial = state
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end
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# set new cache
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def self.cache(config)
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@@change_id = Cache.get('Setting::ChangeId') # rubocop:disable Style/ClassVars
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@@current[:settings_config] = config
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logger.debug "Setting.cache: set cache, #{@@change_id}"
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@@lookup_at = Time.zone.now # rubocop:disable Style/ClassVars
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end
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# reset cache
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def reset_cache
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@@change_id = rand(999_999_999).to_s # rubocop:disable Style/ClassVars
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logger.debug "Setting.reset_cache: set new cache, #{@@change_id}"
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Cache.write('Setting::ChangeId', @@change_id, { expires_in: 24.hours })
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@@current[:settings_config] = nil
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end
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# check if cache is still valid
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def self.cache_valid?
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if @@lookup_at && @@lookup_at > Time.zone.now - @@lookup_timeout
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logger.debug 'Setting.cache_valid?: cache_id has beed set within last 2 minutes'
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return true
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end
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change_id = Cache.get('Setting::ChangeId')
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if change_id == @@change_id
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@@lookup_at = Time.zone.now # rubocop:disable Style/ClassVars
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logger.debug "Setting.cache_valid?: cache still valid, #{@@change_id}/#{change_id}"
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return true
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end
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logger.debug "Setting.cache_valid?: cache has changed, #{@@change_id}/#{change_id}"
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false
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end
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# convert state ot hash to be able to store it as store
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def state_check
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return if !(state || state == false)
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return if !state
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return if state == false
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return if !( !state.respond_to?('has_key?') || !state.key?(:value) )
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return if state.respond_to?('has_key?')
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return if state.key?(:value)
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self.state = { value: state }
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end
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