T.I.L_221227

What’s New for Today

1. Effective Java
   • Concurrency Control
     • Synchronize access to shared mutable data
       • need care for race conditions
     • advoid execessive synchronization
       • cause of loss in performance
       • deadlock issues
     • prefer executors
     • prefer concurrency utilities rather than wait and notify
       • higher level abstraction
       • easy of use
     • document thread safe
     • use lazy initialization judiciously
       • double-edged sword
       • repeated initialization can make performance issue
     • don’t depend on thread scheduler
       • make sure not to have number of runnable threads greater than number of processors