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+/*
+ * Copyright 2017 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 <Foundation/Foundation.h>
+#import "FChange.h"
+#import "FIRDataEventType.h"
+
+@protocol FEvent;
+@class FDataEvent;
+@class FCancelEvent;
+@class FQuerySpec;
+
+@protocol FEventRegistration <NSObject>
+- (BOOL) responseTo:(FIRDataEventType)eventType;
+- (FDataEvent *) createEventFrom:(FChange *)change query:(FQuerySpec *)query;
+- (void) fireEvent:(id<FEvent>)event queue:(dispatch_queue_t)queue;
+- (FCancelEvent *) createCancelEventFromError:(NSError *)error path:(FPath *)path;
+/**
+* Used to figure out what event registration match the event registration that needs to be removed.
+*/
+- (BOOL) matches:(id<FEventRegistration>)other;
+@property (nonatomic, readonly) FIRDatabaseHandle handle;
+@end