Class: QC::ConnAdapter

Inherits:
Object
  • Object
show all
Defined in:
lib/queue_classic/conn_adapter.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(c = nil) ⇒ ConnAdapter

Returns a new instance of ConnAdapter.



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# File 'lib/queue_classic/conn_adapter.rb', line 8

def initialize(c=nil)
  @connection = c.nil? ? establish_new : validate!(c)
  @mutex = Mutex.new
end

Instance Attribute Details

#connection ⇒ Object

Returns the value of attribute connection.



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# File 'lib/queue_classic/conn_adapter.rb', line 7

def connection
  @connection
end

Instance Method Details

#disconnect ⇒ Object 



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# File 'lib/queue_classic/conn_adapter.rb', line 41

def disconnect
  @mutex.synchronize do
    begin
      @connection.close
    rescue => e
      QC.log(:at => 'disconnect', :error => e.message)
    end
  end
end

#execute(stmt, *params) ⇒ Object 



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# File 'lib/queue_classic/conn_adapter.rb', line 13

def execute(stmt, *params)
  @mutex.synchronize do
    QC.log(:at => "exec_sql", :sql => stmt.inspect)
    begin
      params = nil if params.empty?
      r = @connection.exec(stmt, params)
      result = []
      r.each {|t| result << t}
      result.length > 1 ? result : result.pop
    rescue PGError => e
      QC.log(:error => e.inspect)
      @connection.reset
      raise
    end
  end
end

#wait(time, *channels) ⇒ Object 



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# File 'lib/queue_classic/conn_adapter.rb', line 30

def wait(time, *channels)
  @mutex.synchronize do
    listen_cmds = channels.map {|c| 'LISTEN "' + c.to_s + '"'}
    @connection.exec(listen_cmds.join(';'))
    wait_for_notify(time)
    unlisten_cmds = channels.map {|c| 'UNLISTEN "' + c.to_s + '"'}
    @connection.exec(unlisten_cmds.join(';'))
    drain_notify
  end
end