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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/Local/FSTRemoteDocumentChangeBuffer.h"
#import "Firestore/Source/Local/FSTRemoteDocumentCache.h"
#import "Firestore/Source/Model/FSTDocument.h"
#import "Firestore/Source/Model/FSTDocumentKey.h"
#import "Firestore/Source/Util/FSTAssert.h"
NS_ASSUME_NONNULL_BEGIN
@interface FSTRemoteDocumentChangeBuffer ()
- (instancetype)initWithCache:(id<FSTRemoteDocumentCache>)cache;
/** The underlying cache we're buffering changes for. */
@property(nonatomic, strong, nonnull) id<FSTRemoteDocumentCache> remoteDocumentCache;
/** The buffered changes, stored as a dictionary for easy lookups. */
@property(nonatomic, strong, nullable)
NSMutableDictionary<FSTDocumentKey *, FSTMaybeDocument *> *changes;
@end
@implementation FSTRemoteDocumentChangeBuffer
+ (instancetype)changeBufferWithCache:(id<FSTRemoteDocumentCache>)cache {
return [[FSTRemoteDocumentChangeBuffer alloc] initWithCache:cache];
}
- (instancetype)initWithCache:(id<FSTRemoteDocumentCache>)cache {
if (self = [super init]) {
_remoteDocumentCache = cache;
_changes = [NSMutableDictionary dictionary];
}
return self;
}
- (void)addEntry:(FSTMaybeDocument *)maybeDocument {
[self assertValid];
self.changes[maybeDocument.key] = maybeDocument;
}
- (nullable FSTMaybeDocument *)entryForKey:(FSTDocumentKey *)documentKey {
[self assertValid];
FSTMaybeDocument *bufferedEntry = self.changes[documentKey];
if (bufferedEntry) {
return bufferedEntry;
} else {
return [self.remoteDocumentCache entryForKey:documentKey];
}
}
- (void)applyToWriteGroup:(FSTWriteGroup *)group {
[self assertValid];
[self.changes enumerateKeysAndObjectsUsingBlock:^(FSTDocumentKey *key, FSTMaybeDocument *value,
BOOL *stop) {
[self.remoteDocumentCache addEntry:value group:group];
}];
// We should not be used to buffer any more changes.
self.changes = nil;
}
- (void)assertValid {
FSTAssert(self.changes, @"Changes have already been applied.");
}
@end
NS_ASSUME_NONNULL_END
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