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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"
#include <map>
#include <memory>
#import "Firestore/Source/Local/FSTRemoteDocumentCache.h"
#import "Firestore/Source/Model/FSTDocument.h"
#import "Firestore/Source/Util/FSTAssert.h"
#include "Firestore/core/src/firebase/firestore/model/document_key.h"
#include "absl/memory/memory.h"
using firebase::firestore::model::DocumentKey;
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;
@end
@implementation FSTRemoteDocumentChangeBuffer {
/** The buffered changes, stored as a dictionary for easy lookups. */
std::unique_ptr<std::map<DocumentKey, FSTMaybeDocument *>> _changes;
}
+ (instancetype)changeBufferWithCache:(id<FSTRemoteDocumentCache>)cache {
return [[FSTRemoteDocumentChangeBuffer alloc] initWithCache:cache];
}
- (instancetype)initWithCache:(id<FSTRemoteDocumentCache>)cache {
if (self = [super init]) {
_remoteDocumentCache = cache;
_changes = absl::make_unique<std::map<DocumentKey, FSTMaybeDocument *>>();
}
return self;
}
- (void)addEntry:(FSTMaybeDocument *)maybeDocument {
[self assertValid];
(*_changes)[maybeDocument.key] = maybeDocument;
}
- (nullable FSTMaybeDocument *)entryForKey:(const DocumentKey &)documentKey {
[self assertValid];
const auto iter = _changes->find(documentKey);
if (iter == _changes->end()) {
return [self.remoteDocumentCache entryForKey:documentKey];
} else {
return iter->second;
}
}
- (void)applyToWriteGroup:(FSTWriteGroup *)group {
[self assertValid];
for (const auto &kv : *_changes) {
[self.remoteDocumentCache addEntry:kv.second group:group];
}
// We should not be used to buffer any more changes.
_changes.reset();
}
- (void)assertValid {
FSTAssert(_changes, @"Changes have already been applied.");
}
@end
NS_ASSUME_NONNULL_END
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