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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 "FIRStorageObservableTask.h"
#import "FIRStorageObservableTask_Private.h"
#import "FIRStorageTask_Private.h"
@implementation FIRStorageObservableTask {
@private
// Handlers for pause, resume, progress, success, and failure callbacks
NSMutableDictionary<NSString *, FIRStorageVoidSnapshot> *_resumeHandlers;
NSMutableDictionary<NSString *, FIRStorageVoidSnapshot> *_pauseHandlers;
NSMutableDictionary<NSString *, FIRStorageVoidSnapshot> *_progressHandlers;
NSMutableDictionary<NSString *, FIRStorageVoidSnapshot> *_successHandlers;
NSMutableDictionary<NSString *, FIRStorageVoidSnapshot> *_failureHandlers;
// Reverse map of fetcher handles to status types
NSMutableDictionary<NSString *, NSNumber *> *_handleToStatusMap;
}
@synthesize state = _state;
- (instancetype)initWithReference:(FIRStorageReference *)reference
fetcherService:(GTMSessionFetcherService *)service {
self = [super initWithReference:reference fetcherService:service];
if (self) {
_pauseHandlers = [[NSMutableDictionary alloc] init];
_resumeHandlers = [[NSMutableDictionary alloc] init];
_progressHandlers = [[NSMutableDictionary alloc] init];
_successHandlers = [[NSMutableDictionary alloc] init];
_failureHandlers = [[NSMutableDictionary alloc] init];
_handleToStatusMap = [[NSMutableDictionary alloc] init];
}
return self;
}
#pragma mark - Observers
- (FIRStorageHandle)observeStatus:(FIRStorageTaskStatus)status
handler:(FIRStorageVoidSnapshot)handler {
FIRStorageVoidSnapshot callback = handler;
handler = nil;
// Note: self.snapshot is synchronized
FIRStorageTaskSnapshot *snapshot = self.snapshot;
// TODO: use an increasing counter instead of a random UUID
NSString *UUIDString = [[NSUUID UUID] UUIDString];
switch (status) {
case FIRStorageTaskStatusPause:
@synchronized(self) {
[_pauseHandlers setValue:callback forKey:UUIDString];
} // @synchronized(self)
if (_state == FIRStorageTaskStatePausing || _state == FIRStorageTaskStatePaused) {
[self fireHandlers:_pauseHandlers snapshot:snapshot];
}
break;
case FIRStorageTaskStatusResume:
@synchronized(self) {
[_resumeHandlers setValue:callback forKey:UUIDString];
} // @synchronized(self)
if (_state == FIRStorageTaskStateResuming || _state == FIRStorageTaskStateRunning) {
[self fireHandlers:_resumeHandlers snapshot:snapshot];
}
break;
case FIRStorageTaskStatusProgress:
@synchronized(self) {
[_progressHandlers setValue:callback forKey:UUIDString];
} // @synchronized(self)
if (_state == FIRStorageTaskStateRunning || _state == FIRStorageTaskStateProgress) {
[self fireHandlers:_progressHandlers snapshot:snapshot];
}
break;
case FIRStorageTaskStatusSuccess:
@synchronized(self) {
[_successHandlers setValue:callback forKey:UUIDString];
} // @synchronized(self)
if (_state == FIRStorageTaskStateSuccess) {
[self fireHandlers:_successHandlers snapshot:snapshot];
}
break;
case FIRStorageTaskStatusFailure:
@synchronized(self) {
[_failureHandlers setValue:callback forKey:UUIDString];
} // @synchronized(self)
if (_state == FIRStorageTaskStateFailing || _state == FIRStorageTaskStateFailed) {
[self fireHandlers:_failureHandlers snapshot:snapshot];
}
break;
case FIRStorageTaskStatusUnknown:
// Fall through to exception case if an unknown status is passed
default:
[NSException raise:NSInternalInconsistencyException
format:kFIRStorageInvalidObserverStatus, nil];
break;
}
@synchronized(self) {
_handleToStatusMap[UUIDString] = @(status);
} // @synchronized(self)
return UUIDString;
}
- (void)removeObserverWithHandle:(FIRStorageHandle)handle {
FIRStorageTaskStatus status = [_handleToStatusMap[handle] intValue];
NSMutableDictionary<NSString *, FIRStorageVoidSnapshot> *observerDictionary =
[self handlerDictionaryForStatus:status];
@synchronized(self) {
[observerDictionary removeObjectForKey:handle];
[_handleToStatusMap removeObjectForKey:handle];
} // @synchronized(self)
}
- (void)removeAllObserversForStatus:(FIRStorageTaskStatus)status {
NSMutableDictionary<NSString *, FIRStorageVoidSnapshot> *observerDictionary =
[self handlerDictionaryForStatus:status];
[self removeHandlersFromStatusMapForDictionary:observerDictionary];
@synchronized(self) {
[observerDictionary removeAllObjects];
} // @synchronized(self)
}
- (void)removeAllObservers {
@synchronized(self) {
[_pauseHandlers removeAllObjects];
[_resumeHandlers removeAllObjects];
[_progressHandlers removeAllObjects];
[_successHandlers removeAllObjects];
[_failureHandlers removeAllObjects];
[_handleToStatusMap removeAllObjects];
} // @synchronized(self)
}
- (NSMutableDictionary<NSString *, FIRStorageVoidSnapshot> *)handlerDictionaryForStatus:
(FIRStorageTaskStatus)status {
switch (status) {
case FIRStorageTaskStatusPause:
return _pauseHandlers;
case FIRStorageTaskStatusResume:
return _resumeHandlers;
case FIRStorageTaskStatusProgress:
return _progressHandlers;
case FIRStorageTaskStatusSuccess:
return _successHandlers;
case FIRStorageTaskStatusFailure:
return _failureHandlers;
case FIRStorageTaskStatusUnknown:
return [NSMutableDictionary dictionary];
default:
[NSException raise:NSInternalInconsistencyException
format:kFIRStorageInvalidObserverStatus, nil];
return nil;
}
}
- (void)removeHandlersFromStatusMapForDictionary:
(NSMutableDictionary<NSString *, FIRStorageVoidSnapshot> *)dict {
@synchronized(self) {
[_handleToStatusMap removeObjectsForKeys:dict.allKeys];
} // @synchronized(self)
}
- (void)fireHandlersForStatus:(FIRStorageTaskStatus)status
snapshot:(FIRStorageTaskSnapshot *)snapshot {
NSMutableDictionary<NSString *, FIRStorageVoidSnapshot> *observerDictionary =
[self handlerDictionaryForStatus:status];
[self fireHandlers:observerDictionary snapshot:snapshot];
}
- (void)fireHandlers:(NSMutableDictionary<NSString *, FIRStorageVoidSnapshot> *)handlers
snapshot:(FIRStorageTaskSnapshot *)snapshot {
dispatch_queue_t callbackQueue = self.fetcherService.callbackQueue;
if (!callbackQueue) {
callbackQueue = dispatch_get_main_queue();
}
// TODO: iterate over this list in a consistent order
NSMutableDictionary<NSString *, FIRStorageVoidSnapshot> *handlersCopy;
@synchronized(self) {
handlersCopy = [handlers copy];
} // @synchronized(self)
[handlersCopy
enumerateKeysAndObjectsUsingBlock:^(
NSString *_Nonnull key, FIRStorageVoidSnapshot _Nonnull handler, BOOL *_Nonnull stop) {
dispatch_async(callbackQueue, ^{
handler(snapshot);
});
}];
}
@end
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