mirror of
https://github.com/firebase/firebase-ios-sdk
synced 2026-11-11 22:55:59 +05:45
Michael Lehenbauer
34ebf10b0a
[Port of https://github.com/firebase/firebase-js-sdk/commit/0fa319e5e019dd0d40ab441d2ff9f8f6d4724e43] * Refactored FSTOnlineState tracking out of FSTRemoteStore and into new FSTOnlineStateTracker component. * Added a 10 second timeout to transition from OnlineState.Unknown to OnlineState.Offline rather than waiting indefinitely for the stream to succeed or fail. * Removed hack to run SpecTests using an FSTDispatchQueue that wrapped dispatch_get_main_queue(). This was incompatible with [FSTDispatchQueue runDelayedCallbacksUntil:] since it queues work and blocks waiting for it to complete. Now spec tests create / use a proper FSTDispatchQueue. * Added a SpecTest to verify OnlineState timeout behavior. * Misc cleanup: * Renamed FSTOnlineState states: Failed => Offline, Healthy => Online * Renamed FSTTimerIds (ListenStreamConnection => ListenStreamConnectionBackoff) * Added ability to run timers from spec tests.
72 lines
2.4 KiB
Objective-C
72 lines
2.4 KiB
Objective-C
/*
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* Copyright 2018 Google
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import <Foundation/Foundation.h>
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#import "Firestore/Source/Core/FSTTypes.h"
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@class FSTDispatchQueue;
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@protocol FSTOnlineStateDelegate;
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NS_ASSUME_NONNULL_BEGIN
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/**
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* A component used by the FSTRemoteStore to track the FSTOnlineState (that is, whether or not the
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* client as a whole should be considered to be online or offline), implementing the appropriate
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* heuristics.
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*
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* In particular, when the client is trying to connect to the backend, we allow up to
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* kMaxWatchStreamFailures within kOnlineStateTimeout for a connection to succeed. If we have too
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* many failures or the timeout elapses, then we set the FSTOnlineState to Offline, and
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* the client will behave as if it is offline (getDocument() calls will return cached data, etc.).
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*/
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@interface FSTOnlineStateTracker : NSObject
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- (instancetype)initWithWorkerDispatchQueue:(FSTDispatchQueue *)queue;
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- (instancetype)init NS_UNAVAILABLE;
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/** A delegate to be notified on FSTOnlineState changes. */
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@property(nonatomic, weak) id<FSTOnlineStateDelegate> onlineStateDelegate;
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/**
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* Called by FSTRemoteStore when a watch stream is started.
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*
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* It sets the FSTOnlineState to Unknown and starts the onlineStateTimer if necessary.
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*/
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- (void)handleWatchStreamStart;
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/**
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* Called by FSTRemoteStore when a watch stream fails.
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*
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* Updates our FSTOnlineState as appropriate. The first failure moves us to FSTOnlineStateUnknown.
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* We then may allow multiple failures (based on kMaxWatchStreamFailures) before we actually
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* transition to FSTOnlineStateOffline.
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*/
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- (void)handleWatchStreamFailure;
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/**
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* Explicitly sets the FSTOnlineState to the specified state.
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*
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* Note that this resets the timers / failure counters, etc. used by our Offline heuristics, so
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* it must not be used in place of handleWatchStreamStart and handleWatchStreamFailure.
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*/
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- (void)updateState:(FSTOnlineState)newState;
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@end
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NS_ASSUME_NONNULL_END
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