Merge pull request #1 from channel-io/feature/multi_dispatch

[Feature] Add batchDispatch

Author: heoblitz

ReSwift/CoreTypes/Store.swift

@@ -19,6 +19,8 @@ open class Store<State>: StoreType {
 
     private(set) public var state: State! {
         didSet {
+            guard canEmitNewState else { return }
+          
             subscriptions.forEach {
                 if $0.subscriber == nil {
                     subscriptions.remove($0)
@@ -34,10 +36,10 @@ open class Store<State>: StoreType {
     private var reducer: Reducer<State>
 
     var subscriptions: Set<SubscriptionType> = []
+  
+    private var canEmitNewState: Bool = true
 
-    private var isDispatching = Synchronized<Bool>(false)
-
-    /// Indicates if new subscriptions attempt to apply `skipRepeats` 
+    /// Indicates if new subscriptions attempt to apply `skipRepeats`
     /// by default.
     fileprivate let subscriptionsAutomaticallySkipRepeats: Bool
 
@@ -156,25 +158,22 @@ open class Store<State>: StoreType {
 
     // swiftlint:disable:next identifier_name
     open func _defaultDispatch(action: Action) {
-        guard !isDispatching.value else {
-            raiseFatalError(
-                "ReSwift:ConcurrentMutationError- Action has been dispatched while" +
-                " a previous action is being processed. A reducer" +
-                " is dispatching an action, or ReSwift is used in a concurrent context" +
-                " (e.g. from multiple threads). Action: \(action)"
-            )
-        }
-
-        isDispatching.value { $0 = true }
         let newState = reducer(action, state)
-        isDispatching.value { $0 = false }
-
         state = newState
     }
 
     open func dispatch(_ action: Action) {
         dispatchFunction(action)
     }
+  
+    open func batchDispatch(_ actions: [Action]) {
+      canEmitNewState = false
+      actions.forEach { self.dispatch($0) }
+      canEmitNewState = true
+      
+      let newState = state
+      state = newState
+    }
 
     @available(*, deprecated, message: "Deprecated in favor of https://github.com/ReSwift/ReSwift-Thunk")
     open func dispatch(_ actionCreatorProvider: @escaping ActionCreator) {