Spin register itself in its class, aka singleton

3 files changed, 13 insertions, 1 deletions

diff --git a/lib/evendoors/spin.rb b/lib/evendoors/spin.rb
index 31904e8..6b88a55 100644
--- a/lib/evendoors/spin.rb
+++ b/lib/evendoors/spin.rb
@@ -10,13 +10,14 @@ module EvenDoors
         @sys_fifo = []      # system particles fifo list
         @app_fifo = []      # application particles fifo list
         #
+        @spin = nil
         @run = false
         @debug_routing = false
         @debug_errors = false
         #
         class << self
             #
-            attr_accessor :run, :debug_routing, :debug_errors
+            attr_accessor :spin, :run, :debug_routing, :debug_errors
             #
             def release_p p
                 # hope there is no circular loop
@@ -66,6 +67,8 @@ module EvenDoors
         #
         def initialize n, args={}
             super n, nil
+            raise EvenDoors::Exception.new "do not try to initialize more than one spin" if not self.class.spin.nil?
+            self.class.spin = self
             self.class.debug_errors = args[:debug_errors] || false
             self.class.debug_routing = args[:debug_routing] || false
         end
diff --git a/spec/room_spec.rb b/spec/room_spec.rb
index b794900..a683035 100644
--- a/spec/room_spec.rb
+++ b/spec/room_spec.rb
@@ -30,6 +30,7 @@ describe EvenDoors::Room do
     end
     #
     it "parent, spin and resolve should be ok" do
+        EvenDoors::Spin.spin = nil
         s = EvenDoors::Spin.new 'dom0'
         r0 = EvenDoors::Room.new 'r0', s
         r1 = EvenDoors::Room.new 'r1', r0
@@ -238,6 +239,7 @@ describe EvenDoors::Room do
     #
     it "SYS_ACT_ADD_LINK" do
         EvenDoors::Spin.clear!
+        EvenDoors::Spin.spin = nil
         spin = EvenDoors::Spin.new 'dom0'    # needed to be able to route to door
         room0 = EvenDoors::Room.new 'room0', spin
         door0 = EvenDoors::Door.new 'door0', room0
diff --git a/spec/spin_spec.rb b/spec/spin_spec.rb
index 6fd8ccd..97ba7b2 100644
--- a/spec/spin_spec.rb
+++ b/spec/spin_spec.rb
@@ -64,6 +64,7 @@ describe EvenDoors::Spin do
         EvenDoors::Spin.debug_routing = false
         EvenDoors::Spin.debug_routing.should be false
         #
+        EvenDoors::Spin.spin = nil
         EvenDoors::Spin.debug_errors.should be false
         spin = EvenDoors::Spin.new 'dom0', :debug_errors=>true
         EvenDoors::Spin.debug_errors.should be true
@@ -72,6 +73,12 @@ describe EvenDoors::Spin do
         EvenDoors::Spin.debug_errors.should be false
     end
     #
+    it "only 1 Spin instance" do
+        EvenDoors::Spin.spin = nil
+        spin = EvenDoors::Spin.new 'dom0', :debug_routing=>true
+        lambda { EvenDoors::Spin.new('dom1') }.should raise_error(EvenDoors::Exception)
+    end
+    #
 end
 #
 #EOF