Method: OpenWFE::Engine#wait_for

Defined in:
lib/openwfe/engine/engine.rb

#wait_for(fei_or_wfid) ⇒ Object

Waits for a given process instance to terminate. The method only exits when the flow terminates, but beware : if the process already terminated, the method will never exit.

The parameter can be a FlowExpressionId instance, for example the one given back by a launch(), or directly a workflow instance id (String).

This method is mainly used in utests.



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# File 'lib/openwfe/engine/engine.rb', line 482

def wait_for (fei_or_wfid)

    wfid = if fei_or_wfid.kind_of?(FlowExpressionId)
        fei_or_wfid.workflow_instance_id
    else
        fei_or_wfid
    end

    t = Thread.new { Thread.stop }

    to = get_expression_pool.add_observer(:terminate) do |c, fe, wi|
        t.wakeup if (fe.fei.workflow_instance_id == wfid and t.alive?)
    end
    te = get_expression_pool.add_observer(:error) do |c, fei, m, i, e|
        t.wakeup if (fei.parent_wfid == wfid and t.alive?)
    end
    #tc = get_expression_pool.add_observer(:cancel) do |c, fe|
    #    if (fe.fei.wfid == wfid and fe.fei.expid == "0" and t.alive?)
    #        sleep 0.500
    #        t.wakeup 
    #    end
    #end

    linfo { "wait_for() #{wfid}" }

    t.join

    get_expression_pool.remove_observer(to, :terminate)
    get_expression_pool.remove_observer(te, :error)
    #get_expression_pool.remove_observer(tc, :cancel)
        #
        # it would work as well without specifying the channel,
        # but it's thus a little bit faster
end