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diff --git a/Firebase/Database/Public/FIRDatabase.h b/Firebase/Database/Public/FIRDatabase.h
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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 "FIRDatabaseReference.h"
+#import "FIRDatabaseSwiftNameSupport.h"
+
+@class FIRApp;
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * The entry point for accessing a Firebase Database.  You can get an instance by calling
+ * [FIRDatabase database]. To access a location in the database and read or write data,
+ * use [FIRDatabase reference].
+ */
+FIR_SWIFT_NAME(Database)
+@interface FIRDatabase : NSObject
+  
+/**
+ * The NSObject initializer that has been marked as unavailable. Use the `database` 
+ * method instead
+ *
+ * @return An instancetype instance
+*/
++ (instancetype) init __attribute__((unavailable("use the database method instead")));
+
+/**
+ * Gets the instance of FIRDatabase for the default FIRApp.
+ *
+ * @return A FIRDatabase instance.
+ */
++ (FIRDatabase *) database FIR_SWIFT_NAME(database());
+
+/**
+ * Gets an instance of FIRDatabase for a specific FIRApp.
+ *
+ * @param app The FIRApp to get a FIRDatabase for.
+ * @return A FIRDatabase instance.
+ */
++ (FIRDatabase *) databaseForApp:(FIRApp*)app FIR_SWIFT_NAME(database(app:));
+
+/** The FIRApp instance to which this FIRDatabase belongs. */
+@property (weak, readonly, nonatomic) FIRApp *app;
+
+/**
+ * Gets a FIRDatabaseReference for the root of your Firebase Database.
+ */
+- (FIRDatabaseReference *) reference;
+
+/**
+ * Gets a FIRDatabaseReference for the provided path.
+ *
+ * @param path Path to a location in your Firebase Database.
+ * @return A FIRDatabaseReference pointing to the specified path.
+ */
+- (FIRDatabaseReference *) referenceWithPath:(NSString *)path;
+
+/**
+ * Gets a FIRDatabaseReference for the provided URL.  The URL must be a URL to a path
+ * within this Firebase Database.  To create a FIRDatabaseReference to a different database,
+ * create a FIRApp} with a FIROptions object configured with the appropriate database URL.
+ *
+ * @param databaseUrl A URL to a path within your database.
+ * @return A FIRDatabaseReference for the provided URL.
+*/
+- (FIRDatabaseReference *) referenceFromURL:(NSString *)databaseUrl;
+
+/**
+ * The Firebase Database client automatically queues writes and sends them to the server at the earliest opportunity,
+ * depending on network connectivity.  In some cases (e.g. offline usage) there may be a large number of writes
+ * waiting to be sent. Calling this method will purge all outstanding writes so they are abandoned.
+ *
+ * All writes will be purged, including transactions and onDisconnect writes.  The writes will
+ * be rolled back locally, perhaps triggering events for affected event listeners, and the client will not
+ * (re-)send them to the Firebase Database backend.
+ */
+- (void)purgeOutstandingWrites;
+
+/**
+ * Shuts down our connection to the Firebase Database backend until goOnline is called.
+ */
+- (void)goOffline;
+
+/**
+ * Resumes our connection to the Firebase Database backend after a previous goOffline call.
+ */
+- (void)goOnline;
+
+/**
+ * The Firebase Database client will cache synchronized data and keep track of all writes you've
+ * initiated while your application is running. It seamlessly handles intermittent network
+ * connections and re-sends write operations when the network connection is restored.
+ *
+ * However by default your write operations and cached data are only stored in-memory and will
+ * be lost when your app restarts.  By setting this value to `YES`, the data will be persisted
+ * to on-device (disk) storage and will thus be available again when the app is restarted
+ * (even when there is no network connectivity at that time). Note that this property must be
+ * set before creating your first Database reference and only needs to be called once per
+ * application.
+ *
+ */
+@property (nonatomic) BOOL persistenceEnabled FIR_SWIFT_NAME(isPersistenceEnabled);
+
+/**
+ * By default the Firebase Database client will use up to 10MB of disk space to cache data. If the cache grows beyond
+ * this size, the client will start removing data that hasn't been recently used. If you find that your application
+ * caches too little or too much data, call this method to change the cache size. This property must be set before
+ * creating your first FIRDatabaseReference and only needs to be called once per application.
+ *
+ * Note that the specified cache size is only an approximation and the size on disk may temporarily exceed it
+ * at times. Cache sizes smaller than 1 MB or greater than 100 MB are not supported.
+ */
+@property (nonatomic) NSUInteger persistenceCacheSizeBytes;
+
+/**
+ * Sets the dispatch queue on which all events are raised. The default queue is the main queue.
+ *
+ * Note that this must be set before creating your first Database reference.
+ */
+@property (nonatomic, strong) dispatch_queue_t callbackQueue;
+
+/**
+ * Enables verbose diagnostic logging.
+ *
+ * @param enabled YES to enable logging, NO to disable.
+ */
++ (void) setLoggingEnabled:(BOOL)enabled;
+
+/** Retrieve the Firebase Database SDK version. */
++ (NSString *) sdkVersion;
+
+@end
+
+NS_ASSUME_NONNULL_END