JRuby on Rails thread safety and connection pooling
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The document discusses thread safety in JRuby on Rails applications. It explains that prior to Rails 2.2, each JRuby instance had its own database connection, but newer versions use connection pooling so multiple threads can share database connections through a single JRuby instance. It also covers using ActiveRecord connection pooling and JNDI lookup to configure database connections in a thread-safe way when using JRuby on Rails.
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JRuby on Rails thread safety and connection pooling
- 1. JRuby on Rails and Thread Safety Naoto Takai Akasaka.rb / Itochu Techno-Solutions Corp. 29 November 2008
- 2. ‣ JRuby on Rails and Thread Safety ‣ ActiveRecord and Connection Pooling ‣ JNDI and Connection Pooling
- 3. ‣ JRuby on Rails and Thread Safety ‣ ActiveRecord and Connection Pooling ‣ JNDI and Connection Pooling
- 4. Ruby on Rails 2.2 Release Notes
- 5. Ruby on Rails 2.1 or Prior Ruby Process Rails Instance Ruby Process Rails Database Instance Ruby Process Rails Instance
- 6. JRuby on Rails 2.1 or Prior Thread JRuby Rails Instance Thread JRuby Rails Database Instance Thread JRuby Rails Instance Thread
- 7. One JRuby Instance, One Database Connection JRuby Thread Rails Database Instance
- 8. JRuby on Rails 2.2 or Later Thread JRuby Rails Instance Thread JRuby Connection Rails Database Instance Pool Thread JRuby Rails Instance Thread
- 9. One JRuby Instance, Many Database Connections Thread JRuby Rails Database Instance Thread You need less JRuby instances per database connections.
- 10. ‣ JRuby on Rails and Thread Safety ‣ ActiveRecord and Connection Pooling ‣ JNDI and Connection Pooling
- 11. ActiveRecord Connection Pool ActiveRecord::Base.establish_connection( :adapter => quot;mysqlquot;, :username => quot;rootquot;, :database => quot;databasequot;, :pool => 5 )
- 12. Demo Code 10.times do Thread.new do ActiveRecord::Base.connection_pool .with_connection do |c| ret = c.execute(quot;select connection_id()quot;) puts quot;Connection ID: %squot; % ret.fetch_row end end end
- 13. ActiveRecord Connection Pooling (1) Check-out Connect Connection ActiveRecord Database Pool Connection
- 14. ActiveRecord Connection Pooling (2) Check-out Connection ActiveRecord Database Pool Connection
- 15. ActiveRecord Connection Pooling (3) Wait Check-out Connection ActiveRecord Database Pool Connection Check-out Check-in ActiveRecord
- 16. ‣ JRuby on Rails and Thread Safety ‣ ActiveRecord and Connection Pooling ‣ JNDI and Connection Pooling
- 17. ‣ JNDI (Java Naming and Directory Service) ‣ Binding a name to an object. ‣ Look-up the object by name.
- 18. Using JNDI Look-up ActiveRecord::Base.establish_connection( :adapter => quot;jdbcquot;, :jndi => quot;jdbc/MySQLquot;, :driver => quot;com.mysql.jdbc.Driverquot;, :pool => 5 )
- 19. JNDI Look-up Look-up Reference Connection Client Database Pool Data Source
- 20. Java EE Application Server Connection Pooling Connect or Check-out Reconnect ActiveRecord App Server ActiveRecord Connection Connection Pool Pool Connection Connection Check-in Disconnect Database