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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 "Firestore/Source/Util/FSTAsyncQueryListener.h"
#import "Firestore/Source/Util/FSTDispatchQueue.h"
@implementation FSTAsyncQueryListener {
volatile BOOL _muted;
FSTViewSnapshotHandler _snapshotHandler;
FSTDispatchQueue *_dispatchQueue;
}
- (instancetype)initWithDispatchQueue:(FSTDispatchQueue *)dispatchQueue
snapshotHandler:(FSTViewSnapshotHandler)snapshotHandler {
if (self = [super init]) {
_dispatchQueue = dispatchQueue;
_snapshotHandler = snapshotHandler;
}
return self;
}
- (FSTViewSnapshotHandler)asyncSnapshotHandler {
// Retain `self` strongly in resulting snapshot handler so that even if the
// user releases the `FSTAsyncQueryListener` we'll continue to deliver
// events. This is done specifically to facilitate the common case where
// users just want to turn on notifications "forever" and don't want to have
// to keep track of our handle to keep them going.
return ^(FSTViewSnapshot *_Nullable snapshot, NSError *_Nullable error) {
[self->_dispatchQueue dispatchAsync:^{
if (!self->_muted) {
self->_snapshotHandler(snapshot, error);
}
}];
};
}
- (void)mute {
_muted = true;
}
@end
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