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Pods/FirebaseInstanceID/Firebase/InstanceID/FIRInstanceIDCombinedHandler.m

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+/*
+ * Copyright 2019 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "FIRInstanceIDCombinedHandler.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+typedef void (^FIRInstanseIDHandler)(id _Nullable result, NSError *_Nullable error);
+
+@interface FIRInstanceIDCombinedHandler <ResultType>()
+@property(atomic, readonly, strong) NSMutableArray<FIRInstanseIDHandler> *handlers;
+@end
+
+NS_ASSUME_NONNULL_END
+
+@implementation FIRInstanceIDCombinedHandler
+
+- (instancetype)init {
+  self = [super init];
+  if (self) {
+    _handlers = [NSMutableArray array];
+  }
+  return self;
+}
+
+- (void)addHandler:(FIRInstanseIDHandler)handler {
+  if (!handler) {
+    return;
+  }
+
+  @synchronized(self) {
+    [self.handlers addObject:handler];
+  }
+}
+
+- (FIRInstanseIDHandler)combinedHandler {
+  FIRInstanseIDHandler combinedHandler = nil;
+
+  @synchronized(self) {
+    NSArray<FIRInstanseIDHandler> *handlers = [self.handlers copy];
+    combinedHandler = ^(id result, NSError *error) {
+      for (FIRInstanseIDHandler handler in handlers) {
+        handler(result, error);
+      }
+    };
+  }
+
+  return combinedHandler;
+}
+
+@end