Cleaned up initializers

graph.go

@@ -272,8 +272,28 @@ func (node * BaseNode) SetState(new_state NodeState) {
   node.state = new_state
 }
 
-// How to prevent the states from being modified if they're pointer receivers?
+func checkForDuplicate(nodes []GraphNode) error {
+  found := map[NodeID]bool{}
+  for _, node := range(nodes) {
+    if node == nil {
+      return fmt.Errorf("Cannot get state of nil node")
+    }
+
+    _, exists := found[node.ID()]
+    if exists == true {
+      return fmt.Errorf("Attempted to get state of %s twice", node.ID())
+    }
+    found[node.ID()] = true
+  }
+  return nil
+}
+
 func UseStates(ctx * GraphContext, nodes []GraphNode, states_fn func(states []NodeState)(interface{}, error)) (interface{}, error) {
+  err := checkForDuplicate(nodes)
+  if err != nil {
+    return nil, err
+  }
+
   for _, node := range(nodes) {
     node.StateLock().RLock()
   }
@@ -293,6 +313,11 @@ func UseStates(ctx * GraphContext, nodes []GraphNode, states_fn func(states []No
 }
 
 func UpdateStates(ctx * GraphContext, nodes []GraphNode, states_fn func(states []NodeState)([]NodeState, interface{}, error)) (interface{}, error) {
+  err := checkForDuplicate(nodes)
+  if err != nil {
+    return nil, err
+  }
+
   for _, node := range(nodes) {
     node.StateLock().Lock()
   }

lockable.go

@@ -168,45 +168,67 @@ func NewLockHolderState() BaseLockHolderState {
   }
 }
 
-func NewLockableState(name string) BaseLockableState {
-  return BaseLockableState{
-    BaseLockHolderState: NewLockHolderState(),
-    name: name,
-    owner: nil,
-    requirements: []Lockable{},
-    dependencies: []Lockable{},
-  }
+func LinkLockables(ctx * GraphContext, lockable Lockable, requirements []Lockable) error {
+  if lockable == nil {
+    return fmt.Errorf("LOCKABLE_LINK_ERR: Will not link Lockables to nil as requirements")
   }
 
-// Link a lockable with a requirement
-func LinkLockables(ctx * GraphContext, lockable Lockable, requirement Lockable) error {
-  if lockable == nil || requirement == nil {
-    return fmt.Errorf("Will not connect nil to DAG")
+  for _, requirement := range(requirements) {
+    if requirement == nil {
+      return fmt.Errorf("LOCKABLE_LINK_ERR: Will not link nil to a Lockable as a requirement")
     }
 
     if lockable.ID() == requirement.ID() {
-    return fmt.Errorf("Will not link %s as requirement of itself", lockable.ID())
+      return fmt.Errorf("LOCKABLE_LINK_ERR: cannot link %s to itself", lockable.ID())
+    }
   }
 
-  _, err := UpdateStates(ctx, []GraphNode{lockable, requirement}, func(states []NodeState) ([]NodeState, interface{}, error) {
+  nodes := make([]GraphNode, len(requirements) + 1)
+  nodes[0] = lockable
+  for i, node := range(requirements) {
+    nodes[i+1] = node
+  }
+  _, err := UpdateStates(ctx, nodes, func(states []NodeState) ([]NodeState, interface{}, error) {
+    // Check that all the requirements can be added
     lockable_state := states[0].(LockableState)
-    requirement_state := states[1].(LockableState)
+    for i, requirement := range(requirements) {
+      requirement_state := states[i+1].(LockableState)
 
-    if checkIfRequirement(ctx, lockable_state, lockable.ID(), requirement_state, requirement.ID()) == true {
+
+      if checkIfRequirement(ctx, lockable.ID(), requirement_state, requirement.ID()) == true {
         return nil, nil, fmt.Errorf("LOCKABLE_LINK_ERR: %s is a dependency of %s so cannot link as requirement", requirement.ID(), lockable.ID())
       }
 
-    if checkIfRequirement(ctx, requirement_state, requirement.ID(), lockable_state, lockable.ID()) == true {
+      if checkIfRequirement(ctx, requirement.ID(), lockable_state, lockable.ID()) == true {
         return nil, nil, fmt.Errorf("LOCKABLE_LINK_ERR: %s is a dependency of %s so cannot link as dependency again", lockable.ID(), requirement.ID())
       }
-
-    lockable_state.AddRequirement(requirement)
+    }
+    // Update the states of the requirements
+    for i, requirement := range(requirements) {
+      requirement_state := states[i+1].(LockableState)
       requirement_state.AddDependency(lockable)
-    return []NodeState{lockable_state, requirement_state}, nil, nil
+      lockable_state.AddRequirement(requirement)
+    }
+
+    // Return no error
+    return states, nil, nil
   })
+
   return err
 }
 
+func NewBaseLockableState(name string) BaseLockableState {
+  state := BaseLockableState{
+    BaseLockHolderState: NewLockHolderState(),
+    name: name,
+    owner: nil,
+    requirements: []Lockable{},
+    dependencies: []Lockable{},
+  }
+
+  return state
+}
+
 type Lockable interface {
   GraphNode
   // Called when locking the node to allow for custom lock behaviour
@@ -246,14 +268,14 @@ func (lockable * BaseLockable) PropagateUpdate(ctx * GraphContext, signal GraphS
   })
 }
 
-func checkIfRequirement(ctx * GraphContext, r LockableState, r_id NodeID, cur LockableState, cur_id NodeID) bool {
+func checkIfRequirement(ctx * GraphContext, r_id NodeID, cur LockableState, cur_id NodeID) bool {
   for _, c := range(cur.Requirements()) {
     if c.ID() == r_id {
       return true
     }
     val, _ := UseStates(ctx, []GraphNode{c}, func(states []NodeState) (interface{}, error) {
       requirement_state := states[0].(LockableState)
-      return checkIfRequirement(ctx, cur, cur_id, requirement_state, c.ID()), nil
+      return checkIfRequirement(ctx, cur_id, requirement_state, c.ID()), nil
     })
 
     is_requirement := val.(bool)
@@ -408,17 +430,15 @@ func (lockable * BaseLockable) Unlock(node GraphNode, state LockableState) error
 }
 
 func NewLockable(ctx * GraphContext, name string, requirements []Lockable) (* BaseLockable, error) {
-  state := NewLockableState(name)
+  state := NewBaseLockableState(name)
   lockable := &BaseLockable{
     BaseNode: NewNode(ctx, RandID(), &state),
   }
 
-  for _, requirement := range(requirements) {
-    err := LinkLockables(ctx, lockable, requirement)
+  err := LinkLockables(ctx, lockable, requirements)
   if err != nil {
     return nil, err
   }
-  }
 
   return lockable, nil
 }

thread.go

@@ -130,14 +130,14 @@ func (state * BaseThreadState) AddChild(child Thread, info ThreadInfo) error {
   return nil
 }
 
-func checkIfChild(ctx * GraphContext, thread_state ThreadState, thread_id NodeID, cur_state ThreadState, cur_id NodeID) bool {
+func checkIfChild(ctx * GraphContext, thread_id NodeID, cur_state ThreadState, cur_id NodeID) bool {
   for _, child := range(cur_state.Children()) {
     if child.ID() == thread_id {
       return true
     }
     val, _ := UseStates(ctx, []GraphNode{child}, func(states []NodeState) (interface{}, error) {
       child_state := states[0].(ThreadState)
-      return checkIfRequirement(ctx, cur_state, cur_id, child_state, child.ID()), nil
+      return checkIfChild(ctx, cur_id, child_state, child.ID()), nil
     })
 
     is_child := val.(bool)
@@ -167,11 +167,11 @@ func LinkThreads(ctx * GraphContext, thread Thread, child Thread, info ThreadInf
       return nil, nil, fmt.Errorf("EVENT_LINK_ERR: %s already has a parent, cannot link as child", child.ID())
     }
 
-    if checkIfChild(ctx, thread_state, thread.ID(), child_state, child.ID()) == true {
+    if checkIfChild(ctx, thread.ID(), child_state, child.ID()) == true {
       return nil, nil, fmt.Errorf("EVENT_LINK_ERR: %s is a child of %s so cannot add as parent", thread.ID(), child.ID())
     }
 
-    if checkIfChild(ctx, child_state, child.ID(), thread_state, thread.ID()) == true {
+    if checkIfChild(ctx, child.ID(), thread_state, thread.ID()) == true {
       return nil, nil, fmt.Errorf("EVENT_LINK_ERR: %s is already a parent of %s so will not add again", thread.ID(), child.ID())
     }
 
@@ -363,17 +363,16 @@ var ThreadCancel = func(ctx * GraphContext, thread Thread, signal GraphSignal) (
 
 func NewBaseThreadState(name string) BaseThreadState {
   return BaseThreadState{
-    BaseLockableState: NewLockableState(name),
+    BaseLockableState: NewBaseLockableState(name),
     children: []Thread{},
     child_info: map[NodeID]ThreadInfo{},
     parent: nil,
   }
 }
 
-func NewBaseThread(ctx * GraphContext, name string) (BaseThread, error) {
-  state := NewBaseThreadState(name)
+func NewBaseThread(ctx * GraphContext, name string, actions ThreadActions, handlers ThreadHandlers, state ThreadState) (BaseThread, error) {
   thread := BaseThread{
-    BaseLockable: BaseLockable{BaseNode: NewNode(ctx, RandID(), &state)},
+    BaseLockable: BaseLockable{BaseNode: NewNode(ctx, RandID(), state)},
     Actions: ThreadActions{
       "wait": ThreadWait,
       "start": ThreadDefaultStart,
@@ -386,32 +385,29 @@ func NewBaseThread(ctx * GraphContext, name string) (BaseThread, error) {
     timeout_action: "",
   }
 
+  for key, fn := range(actions) {
+    thread.Actions[key] = fn
+  }
+
+  for key, fn := range(handlers) {
+    thread.Handlers[key] = fn
+  }
+
   return thread, nil
 }
 
-func NewThread(ctx * GraphContext, name string, requirements []Lockable, actions ThreadActions, handlers ThreadHandlers) (* BaseThread, error) {
-  thread, err := NewBaseThread(ctx, name)
+func NewSimpleBaseThread(ctx * GraphContext, name string, requirements []Lockable, actions ThreadActions, handlers ThreadHandlers) (* BaseThread, error) {
+  state := NewBaseThreadState(name)
+  thread, err := NewBaseThread(ctx, name, actions, handlers, &state)
   if err != nil {
     return nil, err
   }
 
   thread_ptr := &thread
 
-  for _, requirement := range(requirements) {
-    err := LinkLockables(ctx, thread_ptr, requirement)
+  err = LinkLockables(ctx, thread_ptr, requirements)
   if err != nil {
     return nil, err
   }
-  }
-
-  for key, fn := range(actions) {
-    thread.Actions[key] = fn
-  }
-
-  for key, fn := range(handlers) {
-    thread.Handlers[key] = fn
-  }
-
   return thread_ptr, nil
 }
-

thread_test.go

@@ -10,7 +10,7 @@ import (
 func TestNewEvent(t * testing.T) {
   ctx := testContext(t)
 
-  t1, err := NewThread(ctx, "Test thread 1", []Lockable{}, ThreadActions{}, ThreadHandlers{})
+  t1, err := NewSimpleBaseThread(ctx, "Test thread 1", []Lockable{}, ThreadActions{}, ThreadHandlers{})
   fatalErr(t, err)
 
   go func(thread Thread) {
@@ -37,7 +37,7 @@ func TestEventWithRequirement(t * testing.T) {
   l1, err := NewLockable(ctx, "Test Lockable 1", []Lockable{})
   fatalErr(t, err)
 
-  t1, err := NewThread(ctx, "Test Thread 1", []Lockable{l1}, ThreadActions{}, ThreadHandlers{})
+  t1, err := NewSimpleBaseThread(ctx, "Test Thread 1", []Lockable{l1}, ThreadActions{}, ThreadHandlers{})
   fatalErr(t, err)
 
   go func (thread Thread) {
@@ -66,3 +66,11 @@ func TestEventWithRequirement(t * testing.T) {
   })
   fatalErr(t, err)
 }
+
+func TestCustomEventState(t * testing.T ) {
+  ctx := logTestContext(t, []string{"lockable", "thread"})
+
+  t1, err := NewSimpleBaseThread(ctx, "Test Thread 1", []Lockable{}, ThreadActions{}, ThreadHandlers{})
+  fatalErr(t, err)
+  println(t1)
+}