Logging in Java

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requests (due to REST hits, DB hits, filesystem hits and so on), Ruby will now have the option of scheduling another request to execute Put another way, removing the coarse-grained lock will at least improve concurrency up to the best that green-threaded implementations can do, which isn t too bad
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To learn the practical implications of writing thread-safe application code, the extent of which exceed the scope of this book, make sure to study Pratik Naik s excellent (but foul-mouthed) analysis of the subject10
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16 Logging
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Most programming contexts in Rails (models, controllers, view templates) have a logger attribute, which holds a reference to a logger conforming to the interface of Log4r or the default Ruby 18+ Logger class Can t get a reference to logger somewhere in your code The Railslogger method references a logger that you can use anywhere It s really easy to create a new Logger in Ruby, as shown in the following example:
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$ irb > require 'logger' => true irb(main):002:0> logger = Loggernew STDOUT => #<Logger:0x32db4c @level=0, @progname=nil, @logdev= #<Logger::LogDevice:0x32d9bc > > loggerwarn "do not want!!!" W, [2007-06-06T17:25:35666927 #7303] => true
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WARN -- : do not want!!!
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> loggerinfo "in your logger, giving info" I, [2007-06-06T17:25:50787598 #7303] INFO -- : in your logger, giving your info => true
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Typically, you add a message to the log using the logger whenever the need arises, using a method corresponding to the severity of the log message The standard logger s severities are (in increasingly severe order):
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debug Use the debug level to capture data and application state useful for debugging
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problems later on This level is not usually captured in production logs
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10 http://monkeyorg/2008/10/23/thread-safety-for-your-rails
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1: Rails Environments and Configuration
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info Use info level to capture informational messages I like to use this log level for time-
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stamping non-ordinary events that are still within the bounds of good application behavior
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warn Use the warn level to capture things that are out of the ordinary and might be
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worth investigating Sometimes I ll throw in a logged warning when guard clauses in my code keep a client from doing something they weren t supposed to do My goal is to alert whoever s maintaining the application about a malicious user or bug in the user interface, as in the following example:
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def create begin groupadd_member(current_user) flash[:notice] = "Successfully joined #{scenedisplay_name}" rescue ActiveRecord::RecordInvalid flash[:error] = "You are already a member of #{groupname}" loggerwarn "A user tried to join a group twice UI should not have allowed it" end redirect_to :back end
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error Use the error log level to capture information about error conditions that don t
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require a server restart
fatal The worst-case imaginable has happened your application is now dead and
manual intervention is necessary to restart it
161 Rails Log Files
The log folder of your Rails application holds three log files corresponding to each of the standard environments Log files can grow very large over time A rake task is provided for easily clearing the log files:
rake log:clear # Truncates all *log files in log/ to zero bytes
The contents of log/developmentlog are very useful while you re working Many Rails coders leave a terminal window open with a continuous tail of the development log open while they re coding:
$ tail -f log/developmentlog User Load (05ms) SELECT * FROM users WHERE (users'id' = 1) CACHE (00ms) SELECT * FROM users WHERE (users'id' = 1)
16 Logging
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All sorts of valuable information are available in the development log For instance, every time you make a request, a bunch of useful information about it shows up in the log Here s a sample from one of my projects
Started GET "/user_photos/1" for 127001 at 2007-06-06 17:43:13 Processing by UserPhotosController#show as HTML Parameters: {"/users/8-Obie-Fernandez/photos/406"=>nil, "action"=>"show", "id"=>"406", "controller"=>"user_photos", "user_id"=>"8-Obie-Fernandez"} User Load (04ms) SELECT * FROM users WHERE (users'id' = 8) Photo Load (09ms) SELECT * FROM photos WHERE (photos'id' = 406 AND (photosresource_id = 8 AND photosresource_type = 'User')) CACHE (00ms) SELECT * FROM users WHERE (users'id' = 8) Rendered adsense/_medium_rectangle (15ms) User Load (05ms) SELECT * FROM users WHERE (users'id' = 8) LIMIT 1 SQL (04ms) SELECT count(*) AS count_all FROM messages WHERE (messagesreceiver_id = 8 AND (messages'read' = 0)) Rendered layouts/_header (253ms) Rendered adsense/_leaderboard (04ms) Rendered layouts/_footer (08ms) Rendered photos/showhtmlerb within layouts/applicationhtmlerb (389ms) Completed in 99ms (Views: 374ms | ActiveRecord: 123ms) with 200
This is a list of all the data items contained in that chunk of log output:
The controller and action that were invoked The remote IP address of the computer making the request A timestamp indicating when the request happened The session ID associated with the request The hash of parameters associated with the request Database request information including the time and the SQL statement executed Query cache hit info including time and the SQL statement triggering results from