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Contents
---
title: Rails日志实现探索（3）
layout: post
category: ruby
---
## 订阅者（接外包）的实现
### `ActiveSupport::Subscriber` 负责干活的订阅者
```ruby
def start(name, id, payload)
e = ActiveSupport::Notifications::Event.new(name, Time.now, nil, id, payload)
parent = event_stack.last
parent << e if parent
event_stack.push e
end
def finish(name, id, payload)
finished = Time.now
event = event_stack.pop
event.end = finished
event.payload.merge!(payload)
method = name.split('.').first
send(method, event)
end
```
## `ActiveSupport::LogSubscriber < ActiveSupport::Subscriber`
```ruby
def start(name, id, payload)
super if logger
end
def finish(name, id, payload)
super if logger
rescue Exception => e
logger.error "Could not log #{name.inspect} event. #{e.class}: #{e.message} #{e.backtrace}"
end
```
这里的 logger 实际是 Rails.logger
##
Version data entries
3 entries across 3 versions & 1 rubygems