Module: ActiveRecord::AdvisoryLock::Etest

Defined in:
lib/vex/active_record/advisory_lock/sqlite_adapter.rb

Overview

Note: these tests are un within multiple threads of a single application. This is not the usual intention of locking code: AbstractAdapter#lock should be used to lock across processes!

Consequently locking does not work on in-memory sqlite databases.

Defined Under Namespace

Classes: Test

Instance Method Summary collapse

Instance Method Details

#test_sqlite ⇒ Object 



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# File 'lib/vex/active_record/advisory_lock/sqlite_adapter.rb', line 24

def test_sqlite
  @run = 0

  connection = Test.connection

  #
  # In this example th2 would run first, because th1 goes to sleep
  # first.
  th1 = Thread.new { 
    Thread.sleep 0.1
    connection.locked("etest") do
      assert_equal(2, @run)
      @run = 1
    end
  }

  th2 = Thread.new { 
    Thread.sleep 0.05
    connection.locked("etest") do
      @run = 2
    end
  }

  th1.join
  th2.join
  
  assert_equal(1, @run)

  #
  # In this example th1 would lock using the connection before th2 tries to
  # lock it. Consequenty the th1 action would run first.
  @run = 0
  
  th1 = Thread.new { 
    connection.locked("etest") do
      Thread.sleep 0.1
      assert_equal(0, @run)
      @run = 1
    end
  }

  th2 = Thread.new { 
    Thread.sleep 0.05
    connection.locked("etest") do
      assert_equal(1, @run)
      @run = 2
    end
  }

  th1.join
  th2.join
  
  assert_equal(2, @run)
end