Swift Package Manager support

Sources/CoreStore.swift

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+//
+//  CoreStore.swift
+//  CoreStore
+//
+//  Copyright © 2014 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import CoreData
+#if USE_FRAMEWORKS
+    import GCDKit
+#endif
+
+
+// MARK: - CoreStore
+
+/**
+ `CoreStore` is the main entry point for all other APIs.
+ */
+public enum CoreStore {
+    
+    /**
+     The default `DataStack` instance to be used. If `defaultStack` is not set before the first time accessed, a default-configured `DataStack` will be created.
+     
+     Changing the `defaultStack` is thread safe, but it is recommended to setup `DataStacks` on a common queue (e.g. the main queue).
+     */
+    public static var defaultStack: DataStack {
+        
+        get {
+        
+            self.defaultStackBarrierQueue.barrierSync {
+        
+                if self.defaultStackInstance == nil {
+        
+                    self.defaultStackInstance = DataStack()
+                }
+            }
+            return self.defaultStackInstance!
+        }
+        set {
+            
+            self.defaultStackBarrierQueue.barrierAsync {
+                
+                self.defaultStackInstance = newValue
+            }
+        }
+    }
+    
+    
+    // MARK: Private
+    
+    private static let defaultStackBarrierQueue = GCDQueue.createConcurrent("com.coreStore.defaultStackBarrierQueue")
+    
+    private static var defaultStackInstance: DataStack?
+}