Updated listener to have explicit unregister. Cleanup of initializers. More stuff I don't remember.

event.go

@@ -6,19 +6,18 @@ import (
   "errors"
   "reflect"
   "sort"
-  "sync"
 )
 
 // Update the events listeners, and notify the parent to do the same
-func (event * BaseEvent) Update(reason string) error {
+func (event * BaseEvent) Update(signal GraphSignal) error {
-  log.Printf("UPDATE BaseEvent %s: %s", event.Name(), reason)
+  log.Printf("UPDATE BaseEvent %s: %+v", event.Name(), signal)
-  err := event.UpdateListeners(reason)
+
-  if err != nil {
+  event.signal <- signal
-    return err
+
-  }
+  event.BaseNode.Update(signal)
 
   if event.parent != nil{
-    return event.parent.Update("update parent")
+    return event.parent.Update(signal)
   }
   return nil
 }
@@ -58,7 +57,6 @@ type Event interface {
   FindChild(id string) Event
   Run() error
   Abort() error
-  Signal(action string) error
   LockResources() error
   Finish() error
 }
@@ -76,32 +74,16 @@ type BaseEvent struct {
   children []Event
   child_info map[Event]EventInfo
   actions map[string]func() (string, error)
+  handlers map[string]func() (string, error)
   parent Event
-  signal chan string
   abort chan string
 }
 
-func (queue * EventQueue) Abort() error {
-  for _, event := range(queue.children) {
-    event.Abort()
-  }
-  for _, c := range(queue.resource_aborts) {
-    c <- "event abort"
-  }
-  queue.signal <- "abort"
-  return nil
-}
-
 func (event * BaseEvent) Abort() error {
   for _, event := range(event.children) {
     event.Abort()
   }
-  event.signal <- "abort"
+  event.signal <- NewSignal(event, "abort")
-  return nil
-}
-
-func (event * BaseEvent) Signal(action string) error {
-  event.signal <- action
   return nil
 }
 
@@ -141,11 +123,17 @@ func (event * BaseEvent) Finish() error {
     }
     resource.NotifyUnlocked()
   }
+
   err := event.DoneResource().Unlock(event)
   if err != nil {
     return err
   }
-  return event.DoneResource().NotifyUnlocked()
+
+  err = event.DoneResource().NotifyUnlocked()
+
+  event.Update(NewSignal(event, "event_done"))
+
+  return err
 }
 
 func (event * BaseEvent) LockDone() {
@@ -153,11 +141,11 @@ func (event * BaseEvent) LockDone() {
 }
 
 func (event * BaseEvent) Run() error {
+  log.Printf("EVENT_RUN: %s", event.Name())
   next_action := "start"
   var err error = nil
   for next_action != "" {
     // Check if the edge exists
-    cur_action := next_action
     action, exists := event.actions[next_action]
     if exists == false {
       error_str := fmt.Sprintf("%s is not a valid action", next_action)
@@ -165,37 +153,17 @@ func (event * BaseEvent) Run() error {
     }
 
     // Run the edge function
+    update_str := fmt.Sprintf("EVENT_ACTION: %s", next_action)
+    log.Printf(update_str)
     next_action, err = action()
     if err != nil {
       return err
-    } else if next_action == "wait" {
-      // Wait for an external signal to set the next_action
-      signal := <- event.signal
-      if signal == "abort" {
-        return errors.New("State Machine aborted by signal")
-      } else {
-        next_action = signal
-      }
-    } else {
-      // next_action is already set correctly
     }
-
-    // Update the event after running the edge
-    update_str := fmt.Sprintf("ACTION %s: NEXT %s", cur_action, next_action)
-    event.Update(update_str)
   }
 
   return nil
 }
 
-// EventQueue is a basic event that can have children.
-// On start, it attempts to start it's children from the highest 'priority'
-type EventQueue struct {
-  BaseEvent
-  resource_aborts map[string]chan string
-  resource_lock sync.Mutex
-}
-
 func NewBaseEvent(name string, description string, required_resources []Resource) (BaseEvent) {
   done_resource := NewResource("event_done", "signal that event is done", []Resource{})
   event := BaseEvent{
@@ -203,7 +171,8 @@ func NewBaseEvent(name string, description string, required_resources []Resource
       name: name,
       description: description,
       id: randid(),
-      listeners: []chan string{},
+      signal: make(chan GraphSignal, 10),
+      listeners: map[chan GraphSignal] chan GraphSignal{},
     },
     parent: nil,
     children: []Event{},
@@ -211,10 +180,26 @@ func NewBaseEvent(name string, description string, required_resources []Resource
     done_resource: done_resource,
     required_resources: required_resources,
     actions: map[string]func()(string, error){},
-    signal: make(chan string, 10),
+    handlers: map[string]func()(string, error){},
     abort: make(chan string, 1),
   }
 
+  event.actions["wait"] = func() (string, error) {
+    signal := <- event.signal
+    if signal.Type() == "abort" {
+      return "", errors.New("State machine aborted by signal")
+    } else if signal.Type() == "do_action" {
+      return signal.Description(), nil
+    } else {
+      signal_fn, exists := event.handlers[signal.Type()]
+      if exists == true {
+        return signal_fn()
+      }
+    }
+    // ignore signals other than "abort" and "do_action"
+    return "wait", nil
+  }
+
   return event
 }
 
@@ -232,10 +217,26 @@ func NewEvent(name string, description string, required_resources []Resource) (*
   return event_ptr
 }
 
+// EventQueue is a basic event that can have children.
+// On start, it attempts to start it's children from the highest 'priority'
+type EventQueue struct {
+  BaseEvent
+  listened_resources map[string]Resource
+}
+
+func (queue * EventQueue) Finish() error {
+  for _, resource := range(queue.listened_resources) {
+    resource.UnregisterChannel(queue.signal)
+  }
+  return queue.BaseEvent.Finish()
+}
+
+
+
 func NewEventQueue(name string, description string, required_resources []Resource) (* EventQueue) {
   queue := &EventQueue{
     BaseEvent: NewBaseEvent(name, description, []Resource{}),
-    resource_aborts: map[string]chan string{},
+    listened_resources: map[string]Resource{},
   }
 
   // Need to lock it with th BaseEvent since Unlock is implemented on the BaseEvent
@@ -257,42 +258,11 @@ func NewEventQueue(name string, description string, required_resources []Resourc
     sort.SliceStable(copied_events, less)
 
     wait := false
+    needed_resources := map[string]Resource{}
     for _, event := range(copied_events) {
-      // Update the resource_chans
+      // make sure all the required resources are registered to update the event
       for _, resource := range(event.RequiredResources()) {
-        queue.resource_lock.Lock()
+        needed_resources[resource.ID()] = resource
-        _, exists := queue.resource_aborts[resource.ID()]
-        if exists == false {
-          log.Printf("RESOURCE_LISTENER_START: %s", resource.Name())
-          abort := make(chan string, 1)
-          queue.resource_aborts[resource.ID()] = abort
-          go func(queue *EventQueue, resource Resource, abort chan string) {
-            log.Printf("RESOURCE_LISTENER_GOROUTINE: %s", resource.Name())
-            resource_chan := resource.UpdateChannel()
-            for true {
-              select {
-              case <- abort:
-                queue.resource_lock.Lock()
-                delete(queue.resource_aborts, resource.ID())
-                queue.resource_lock.Unlock()
-                log.Printf("RESORCE_LISTENER_ABORT: %s", resource.Name())
-                break
-              case msg, ok := <- resource_chan:
-                if ok == false {
-                  queue.resource_lock.Lock()
-                  delete(queue.resource_aborts, resource.ID())
-                  queue.resource_lock.Unlock()
-                  log.Printf("RESOURCE_LISTENER_CLOSED: %s : %s", resource.Name(), msg)
-                  break
-                }
-                log.Printf("RESOURCE_LISTENER_UPDATED: %s : %s", resource.Name(), msg)
-                queue.signal <- "resource_update"
-              }
-            }
-            log.Printf("RESOURCE_LISTENER_DYING: %s", resource.Name())
-          }(queue, resource, abort)
-        }
-        queue.resource_lock.Unlock()
       }
 
       info := queue.ChildInfo(event).(*EventQueueInfo)
@@ -313,7 +283,6 @@ func NewEventQueue(name string, description string, required_resources []Resourc
             }
             info.state = "done"
             event.Finish()
-            queue.Signal("event_done")
           }(event, info, queue)
         }
       } else if info.state == "running" {
@@ -321,6 +290,11 @@ func NewEventQueue(name string, description string, required_resources []Resourc
       }
     }
 
+    for _, resource := range(needed_resources) {
+      queue.listened_resources[resource.ID()] = resource
+      resource.RegisterChannel(queue.signal)
+    }
+
     if wait == true {
       return "wait", nil
     } else {
@@ -340,6 +314,14 @@ func NewEventQueue(name string, description string, required_resources []Resourc
     return "queue_event", nil
   }
 
+  queue.handlers["lock_change"] = func() (string, error) {
+    return "queue_event", nil
+  }
+
+  queue.handlers["event_done"] = func() (string, error) {
+    return "queue_event", nil
+  }
+
   return queue
 }
 
@@ -410,7 +392,7 @@ func (event * BaseEvent) addChild(child Event, info EventInfo) error {
 
   event.children = append(event.children, child)
   event.child_info[child] = info
-  event.Update("child added")
+  event.Update(NewSignal(event, "child_added"))
   return nil
 }
 

graph.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-  "errors"
   "log"
   "sync"
   "github.com/google/uuid"
@@ -13,14 +12,47 @@ func randid() string{
   return uuid_str
 }
 
+type GraphSignal interface {
+  Source() GraphNode
+  Type() string
+  Description() string
+}
+
+type BaseSignal struct {
+  source GraphNode
+  signal_type string
+  description string
+}
+
+func (signal BaseSignal) Source() GraphNode {
+  return signal.source
+}
+
+func (signal BaseSignal) Type() string {
+  return signal.signal_type
+}
+
+func (signal BaseSignal) Description() string {
+  return signal.description
+}
+
+func NewSignal(source GraphNode, signal_type string) (BaseSignal) {
+  signal := BaseSignal{
+    source: source,
+    signal_type: signal_type,
+  }
+  return signal
+}
+
 // GraphNode is the interface common to both DAG nodes and Event tree nodes
 type GraphNode interface {
   Name() string
   Description() string
   ID() string
-  UpdateListeners(info string) error
+  Update(update GraphSignal) error
-  UpdateChannel() chan string
+  RegisterChannel(listener chan GraphSignal)
-  Update(reason string) error
+  UnregisterChannel(listener chan GraphSignal)
+  UpdateChannel() chan GraphSignal
 }
 
 // BaseNode is the most basic implementation of the GraphNode interface
@@ -29,8 +61,9 @@ type BaseNode struct {
   name string
   description string
   id string
-  listeners []chan string
+  signal chan GraphSignal
   listeners_lock sync.Mutex
+  listeners map[chan GraphSignal]chan GraphSignal
 }
 
 func (node * BaseNode) Name() string {
@@ -47,58 +80,47 @@ func (node * BaseNode) ID() string {
 
 // Create a new listener channel for the node, add it to the nodes listener list, and return the new channel
 const listener_buffer = 10
-func (node * BaseNode) UpdateChannel() chan string{
+func (node * BaseNode) UpdateChannel() chan GraphSignal {
-  new_listener := make(chan string, listener_buffer)
+  new_listener := make(chan GraphSignal, listener_buffer)
-  node.listeners_lock.Lock()
+  node.RegisterChannel(new_listener)
-  node.listeners = append(node.listeners, new_listener)
-  node.listeners_lock.Unlock()
   return new_listener
 }
 
-// Send the update to listener channels
+func (node * BaseNode) RegisterChannel(listener chan GraphSignal) {
-func (node * BaseNode) UpdateListeners(info string) error {
-  closed_listeners := []int{}
-  listeners_closed := false
-
-  // Send each listener nil to signal it to check for new content
-  // if the first attempt to send it fails close the listener
   node.listeners_lock.Lock()
-  for i, listener := range node.listeners {
+  _, exists := node.listeners[listener]
-    select {
+  if exists == false {
-      case listener <- info:
+    node.listeners[listener] = listener
-      default:
-        close(listener)
-        closed_listeners = append(closed_listeners, i)
-        listeners_closed = true
   }
+  node.listeners_lock.Unlock()
 }
 
-  // If any listeners have been closed, loop over the listeners
+func (node * BaseNode) UnregisterChannel(listener chan GraphSignal) {
-  // Add listeners to the "remaining" list if i insn't in closed_listeners
+  node.listeners_lock.Lock()
-  if listeners_closed == true {
+  _, exists := node.listeners[listener]
-    remaining_listeners := []chan string{}
+  if exists == false {
-    for i, listener := range node.listeners {
+    panic("Attempting to unregister non-registered listener")
-      listener_closed := false
+  } else {
-      for _, index := range closed_listeners {
+    delete(node.listeners, listener)
-        if index == i {
-          listener_closed = true
-          break
-        }
-      }
-      if listener_closed == false {
-        remaining_listeners = append(remaining_listeners, listener)
   }
+  node.listeners_lock.Unlock()
 }
 
-    node.listeners = remaining_listeners
+// Send the update to listener channels
+func (node * BaseNode) UpdateListeners(update GraphSignal) {
+  node.listeners_lock.Lock()
+
+  for _, listener := range node.listeners {
+    log.Printf("UPDATE_LISTENER %s: %p", node.Name(), listener)
+    listener <- update
   }
-  node.listeners_lock.Unlock()
 
-  return nil
+  node.listeners_lock.Unlock()
 }
 
-// Basic implementation must be overwritten to do anything useful
+// Basic implementation that sends the signal to the nodes channel
-func (node * BaseNode) Update(reason string) error {
+func (node * BaseNode) Update(signal GraphSignal) error {
-  log.Printf("UPDATE: BaseNode %s: %s", node.Name(), reason)
+  log.Printf("UPDATE: BaseNode %s: %+v", node.Name(), signal)
-  return errors.New("Cannot Update a BaseNode")
+  node.UpdateListeners(signal)
+  return nil
 }

main.go

@@ -2,7 +2,6 @@ package main
 
 import (
   "log"
-  "math/rand"
 )
 
 func fake_team(org string, id string, names []string) (*Team, []*Member) {
@@ -26,10 +25,14 @@ func fake_data() * EventManager {
   t6,  m6  := fake_team("210",  "X", []string{"toby"})
   t7,  m7  := fake_team("210",  "Y", []string{"jennifer"})
   t8,  m8  := fake_team("210",  "Z", []string{"emily"})
-  t9,  m9  := fake_team("315",  "W", []string{"bobby"})
+  t9,  m9  := fake_team("666",  "A", []string{"jimmy"})
-  t10, m10 := fake_team("315",  "X", []string{"toby"})
+  t10, m10 := fake_team("666",  "B", []string{"timmy"})
-  t11, m11 := fake_team("315",  "Y", []string{"jennifer"})
+  //t11, m11 := fake_team("666",  "C", []string{"grace"})
-  t12, m12 := fake_team("315",  "Z", []string{"emily"})
+  //t12, m12 := fake_team("666",  "D", []string{"jeremy"})
+  //t13, m13 := fake_team("315",  "W", []string{"bobby"})
+  //t14, m14 := fake_team("315",  "X", []string{"toby"})
+  //t15, m15 := fake_team("315",  "Y", []string{"jennifer"})
+  //t16, m16 := fake_team("315",  "Z", []string{"emily"})
 
   teams = append(teams, t1)
   teams = append(teams, t2)
@@ -41,8 +44,12 @@ func fake_data() * EventManager {
   teams = append(teams, t8)
   teams = append(teams, t9)
   teams = append(teams, t10)
-  teams = append(teams, t11)
+  //teams = append(teams, t11)
-  teams = append(teams, t12)
+  //teams = append(teams, t12)
+  //teams = append(teams, t13)
+  //teams = append(teams, t14)
+  //teams = append(teams, t15)
+  //teams = append(teams, t16)
 
   resources = append(resources, m1[0])
   resources = append(resources, m2[0])
@@ -54,25 +61,22 @@ func fake_data() * EventManager {
   resources = append(resources, m8[0])
   resources = append(resources, m9[0])
   resources = append(resources, m10[0])
-  resources = append(resources, m11[0])
+  //resources = append(resources, m11[0])
-  resources = append(resources, m12[0])
+  //resources = append(resources, m12[0])
-
+  //resources = append(resources, m13[0])
-  alliances := []*Alliance{}
+  //resources = append(resources, m14[0])
-  for i, team := range(teams){
+  //resources = append(resources, m15[0])
-    for true {
+  //resources = append(resources, m16[0])
-      idx := rand.Intn(len(teams))
-      if idx != i {
-        alliance := NewAlliance(team, teams[idx])
-        alliances = append(alliances, alliance)
-        break
-      }
-    }
-  }
 
   arenas := []*Arena{}
   arenas = append(arenas, NewVirtualArena("Arena 1"))
   arenas = append(arenas, NewVirtualArena("Arena 2"))
   arenas = append(arenas, NewVirtualArena("Arena 3"))
+  arenas = append(arenas, NewVirtualArena("Arena 4"))
+  arenas = append(arenas, NewVirtualArena("Arena 5"))
+  arenas = append(arenas, NewVirtualArena("Arena 6"))
+  arenas = append(arenas, NewVirtualArena("Arena 7"))
+  arenas = append(arenas, NewVirtualArena("Arena 8"))
 
   for _, arena := range arenas {
     resources = append(resources, arena)
@@ -82,19 +86,27 @@ func fake_data() * EventManager {
     resources = append(resources, team)
   }
 
+  alliances := []*Alliance{}
+  for i, team := range(teams) {
+    for j, team2 := range(teams) {
+      if i != j {
+        alliance := NewAlliance(team, team2)
+        alliances = append(alliances, alliance)
+      }
+    }
+  }
   for _, alliance := range alliances {
     resources = append(resources, alliance)
   }
 
+
   root_event := NewEventQueue("root_event", "", []Resource{})
   event_manager := NewEventManager(root_event, resources)
   arena_idx := 0
-  for i := 0; i < len(alliances)*5; i++ {
+  // Generate 3 games for each team by picking 3 random teams
-    alliance := alliances[i % len(alliances)]
+  for i, alliance := range(alliances) {
-    for true {
+    for j, alliance2 := range(alliances) {
-      idx := rand.Intn(len(alliances))
+      if j != i {
-      if idx != i {
-        alliance2 := alliances[idx]
         if alliance.Children()[0] == alliance2.Children()[0] || alliance.Children()[0] == alliance2.Children()[1] || alliance.Children()[1] == alliance2.Children()[0] || alliance.Children()[1] == alliance2.Children()[1] {
         } else {
           match := NewMatch(alliance, alliance2, arenas[arena_idx])
@@ -108,7 +120,6 @@ func fake_data() * EventManager {
             arena_idx = 0
           }
         }
-        break
       }
     }
   }

manager.go

@@ -55,8 +55,10 @@ func (manager * EventManager) Run() error {
       c <- nil
     }
   }(abort, aborts)
+
   err := manager.root_event.LockResources()
   if err != nil {
+    abort <- nil
     return err
   }
 

manager_test.go

@@ -9,7 +9,7 @@ import (
 type graph_tester testing.T
 const listner_timeout = 100 * time.Millisecond
 
-func (t * graph_tester) CheckForValue(listener chan string, str string) {
+func (t * graph_tester) CheckForValue(listener chan GraphSignal, str string) {
   timeout := time.After(listner_timeout)
   select {
     case <- listener:
@@ -19,7 +19,7 @@ func (t * graph_tester) CheckForValue(listener chan string, str string) {
   }
 }
 
-func (t * graph_tester) CheckForNone(listener chan string, str string) {
+func (t * graph_tester) CheckForNone(listener chan GraphSignal, str string) {
   timeout := time.After(listner_timeout)
   select {
     case <- listener:
@@ -99,21 +99,23 @@ func TestResourceUpdate(t * testing.T) {
   r4_l := r4.UpdateChannel()
 
   // Calling Update() on the parent with no other parents should only notify node listeners
-  r3.Update("test")
+  println("UPDATE_START")
+  r3.Update(NewSignal(nil, "test"))
+  println("UPDATE_DONE")
   (*graph_tester)(t).CheckForNone(r1_l, "Update on r1 after updating r3")
   (*graph_tester)(t).CheckForNone(r2_l, "Update on r2 after updating r3")
   (*graph_tester)(t).CheckForValue(r3_l, "No update on r3 after updating r3")
   (*graph_tester)(t).CheckForValue(r4_l, "No update on r4 after updating r3")
 
   // Calling Update() on a child should notify listeners of the parent and child, but not siblings
-  r2.Update("test")
+  r2.Update(NewSignal(nil, "test"))
   (*graph_tester)(t).CheckForNone(r1_l, "Update on r1 after updating r2")
   (*graph_tester)(t).CheckForValue(r2_l, "No update on r2 after updating r2")
   (*graph_tester)(t).CheckForValue(r3_l, "No update on r3 after updating r2")
   (*graph_tester)(t).CheckForValue(r4_l, "No update on r4 after updating r2")
 
   // Calling Update() on a child should notify listeners of the parent and child, but not siblings
-  r1.Update("test")
+  r1.Update(NewSignal(nil, "test"))
   (*graph_tester)(t).CheckForValue(r1_l, "No update on r1 after updating r1")
   (*graph_tester)(t).CheckForNone(r2_l, "Update on r2 after updating r1")
   (*graph_tester)(t).CheckForValue(r3_l, "No update on r3 after updating r1")
@@ -268,7 +270,7 @@ func TestAddToEventQueue(t * testing.T) {
 }
 
 func TestStartBaseEvent(t * testing.T) {
-  event_1 := NewEvent("1", "", []Resource{})
+  event_1 := NewEvent("TestStartBaseEvent event_1", "", []Resource{})
   r := event_1.DoneResource()
   manager := NewEventManager(event_1, []Resource{})
 
@@ -331,7 +333,7 @@ func TestAbortEventQueue(t * testing.T) {
 }
 
 func TestStartEventQueue(t * testing.T) {
-  root_event := NewEventQueue("", "", []Resource{})
+  root_event := NewEventQueue("root_event", "", []Resource{})
   r := root_event.DoneResource()
   rel := root_event.UpdateChannel();
   res_1 := NewResource("test_resource", "", []Resource{})

resource.go

@@ -9,15 +9,13 @@ import (
 
 // Resources propagate update up to multiple parents, and not downwards
 // (subscriber to team won't get update to alliance, but subscriber to alliance will get update to team)
-func (resource * BaseResource) Update(reason string) error {
+func (resource * BaseResource) Update(signal GraphSignal) error {
-  log.Printf("UPDATE BaseResource %s: %s", resource.Name(), reason)
+  log.Printf("UPDATE BaseResource %s: %+v", resource.Name(), signal)
-  err := resource.UpdateListeners(reason)
+
-  if err != nil {
+  resource.BaseNode.Update(signal)
-    return err
-  }
 
   for _, parent := range resource.Parents() {
-    err := parent.Update("update parents")
+    err := parent.Update(signal)
     if err != nil {
       return err
     }
@@ -62,7 +60,7 @@ func (resource * BaseResource) Owner() Event {
 }
 
 func (resource * BaseResource) NotifyUnlocked() error {
-  err := resource.Update("finalize_unlock")
+  err := resource.Update(NewSignal(resource, "lock_change"))
   if err != nil {
     return err
   }
@@ -78,7 +76,7 @@ func (resource * BaseResource) NotifyUnlocked() error {
 }
 
 func (resource * BaseResource) NotifyLocked() error {
-  err := resource.Update("finalize_lock")
+  err := resource.Update(NewSignal(resource, "lock_change"))
   if err != nil {
     return err
   }
@@ -90,7 +88,7 @@ func (resource * BaseResource) NotifyLocked() error {
     }
   }
 
-  resource.lock_holder.Update("finalize_lock")
+  resource.lock_holder.Update(NewSignal(resource, "lock_change"))
 
   return nil
 }
@@ -153,10 +151,6 @@ func (resource * BaseResource) Unlock(event Event) error {
   }
   resource.state_lock.Unlock()
 
-  /*if unlocked == true {
-    resource.Update("unlocking resource")
-  }*/
-
   return err
 }
 
@@ -189,13 +183,13 @@ func (resource * BaseResource) AddParent(parent Resource) error {
   return nil
 }
 
-func NewResource(name string, description string, children []Resource) * BaseResource {
+func NewBaseResource(name string, description string, children []Resource) BaseResource {
-  resource := &BaseResource{
+  resource := BaseResource{
     BaseNode: BaseNode{
       name: name,
       description: description,
       id: randid(),
-      listeners: []chan string{},
+      listeners: map[chan GraphSignal]chan GraphSignal{},
     },
     parents: []Resource{},
     children: children,
@@ -203,3 +197,8 @@ func NewResource(name string, description string, children []Resource) * BaseRes
 
   return resource
 }
+
+func NewResource(name string, description string, children []Resource) * BaseResource {
+  resource := NewBaseResource(name, description, children)
+  return &resource
+}

vex.go

@@ -13,16 +13,7 @@ type Member struct {
 
 func NewMember(name string) * Member {
   member := &Member{
-    BaseResource: BaseResource{
+    BaseResource: NewBaseResource(name, "A Team Member", []Resource{}),
-      BaseNode: BaseNode{
-        name: name,
-        description: "A Team Member",
-        id: randid(),
-        listeners: []chan string{},
-      },
-      parents: []Resource{},
-      children: []Resource{},
-    },
   }
 
   return member
@@ -47,22 +38,15 @@ func NewTeam(org string, team string, members []*Member) * Team {
   name := fmt.Sprintf("%s%s", org, team)
   description := fmt.Sprintf("Team %s", name)
   resource := &Team{
-    BaseResource: BaseResource{
+    BaseResource: NewBaseResource(name, description, make([]Resource, len(members))),
-      BaseNode: BaseNode{
-        name: name,
-        description: description,
-        id: randid(),
-        listeners: []chan string{},
-      },
-      parents: []Resource{},
-      children: make([]Resource, len(members)),
-    },
     Org: org,
     Team: team,
   }
+
   for idx, member := range(members) {
     resource.children[idx] = member
   }
+
   return resource
 }
 
@@ -75,16 +59,7 @@ func NewAlliance(team0 * Team, team1 * Team) * Alliance {
   description := ""
 
   resource := &Alliance{
-    BaseResource: BaseResource{
+    BaseResource: NewBaseResource(name, description, []Resource{team0, team1}),
-      BaseNode: BaseNode{
-        name: name,
-        description: description,
-        id: randid(),
-        listeners: []chan string{},
-      },
-      parents: []Resource{},
-      children: []Resource{team0, team1},
-    },
   }
   return resource
 }
@@ -103,16 +78,7 @@ type Arena struct {
 
 func NewVirtualArena(name string) * Arena {
   arena := &Arena{
-    BaseResource: BaseResource{
+    BaseResource: NewBaseResource(name, "A virtual vex arena", []Resource{}),
-      BaseNode: BaseNode{
-        name: name,
-        description: "A virtual vex arena",
-        id: randid(),
-        listeners: []chan string{},
-      },
-      parents: []Resource{},
-      children: []Resource{},
-    },
     connected: false,
   }
 
@@ -128,28 +94,34 @@ func (arena * Arena) Lock(event Event) error {
   return arena.lock(event)
 }
 
+func (arena * Arena) Update(signal GraphSignal) error {
+  log.Printf("UPDATE Arena %s: %+v", arena.Name(), signal)
+
+  arena.BaseResource.Update(signal)
+
+  if arena.connected == true {
+    arena.signal <- signal
+  }
+
+  return nil
+}
+
 func (arena * Arena) Connect(abort chan error) bool {
   log.Printf("Connecting %s", arena.Name())
   go func(arena * Arena, abort chan error) {
-    update_channel := arena.UpdateChannel()
     owner := arena.Owner()
-    var owner_channel chan string = nil
-    if owner != nil {
-      owner_channel = owner.UpdateChannel()
-    }
     arena.connected = true
     update_str := fmt.Sprintf("VIRTUAL_ARENA connected: %s", arena.Name())
-    arena.Update(update_str)
+    signal := NewSignal(arena, "arena_connected")
+    signal.description = update_str
+    arena.Update(signal)
     log.Printf("VIRTUAL_ARENA goroutine starting: %s", arena.Name())
     for true {
       select {
       case <- abort:
         log.Printf("Virtual arena %s aborting", arena.Name())
         break
-      case update, ok := <- update_channel:
+      case update := <- arena.signal:
-        if !ok {
-          panic("own update_channel closed")
-        }
         log.Printf("%s update: %s", arena.Name(), update)
         new_owner := arena.Owner()
         if new_owner != owner {
@@ -168,17 +140,9 @@ func (arena * Arena) Connect(abort chan error) bool {
 
           owner = new_owner
           if owner != nil {
-            owner_channel = owner.UpdateChannel()
           } else {
-            owner_channel = nil
-          }
           }
-      case update, ok := <- owner_channel:
-        if !ok {
-          panic("owner update channel closed")
         }
-        log.Printf("%s owner update: %s", arena.Name(), update)
-        log.Printf("owner: %s", owner.Name())
       }
     }
   }(arena, abort)

vex_test.go

@@ -130,9 +130,11 @@ func TestNewMatch(t *testing.T) {
 
   arena := NewVirtualArena(arena_name)
 
-  root_event := NewMatch(alliance_1, alliance_2, arena)
+  match := NewMatch(alliance_1, alliance_2, arena)
+  root_event := NewEventQueue("root_event", "", []Resource{})
 
   event_manager := NewEventManager(root_event, []Resource{member_1, member_2, member_3, member_4, team_1, team_2, team_3, team_4, alliance_1, alliance_2, arena})
+  event_manager.AddEvent(root_event, match, NewEventQueueInfo(1))
 
   go func() {
     time.Sleep(time.Second * 2)
@@ -140,7 +142,7 @@ func TestNewMatch(t *testing.T) {
   }()
 
   err := event_manager.Run()
-  if err == nil {
+  if err != nil {
     t.Fatal(err)
   }
 }