Progress on lookup tables.
This commit is contained in:
Brent Simmons
parent
4503f771da
commit
570d70d8fe
@ -28,6 +28,8 @@ import Data
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// Because:
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// * They don’t take up much space.
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// * It seriously cuts down on the number of database reads and writes.
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//
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// CREATE TABLE if not EXISTS attachments(databaseID TEXT NOT NULL PRIMARY KEY, articleID TEXT NOT NULL, url TEXT NOT NULL, mimeType TEXT, title TEXT, sizeInBytes INTEGER, durationInSeconds INTEGER);
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final class AttachmentsTable: DatabaseTable {
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@ -23,7 +23,6 @@ final class AuthorsTable: DatabaseTable {
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let queue: RSDatabaseQueue
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private let cache = ObjectCache<Author>(keyPathForID: \Author.databaseID)
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private var articleIDToAuthorsCache = [String: Set<Author>]()
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private var articleIDsWithNoAuthors = Set<String>()
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private let authorsLookupTable = LookupTable(name: DatabaseTableName.authorsLookup, primaryKey: DatabaseKey.authorID, foreignKey: DatabaseKey.articleID)
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init(name: String, queue: RSDatabaseQueue) {
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@ -36,15 +35,15 @@ final class AuthorsTable: DatabaseTable {
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attachCachedAuthors(articles)
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let articlesNeedingAuthors = articlesMissingAuthors(articles)
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if articlesNeedingAuthors.isEmpty {
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let articlesMissingAuthors = articlesNeedingAuthors(articles)
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if articlesMissingAuthors.isEmpty {
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return
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}
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let articleIDs = Set(articlesNeedingAuthors.map { $0.databaseID })
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let articleIDs = Set(articlesMissingAuthors.map { $0.databaseID })
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let authorTable = fetchAuthorsForArticleIDs(articleIDs, database)
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for article in articlesNeedingAuthors {
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for article in articlesMissingAuthors {
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let articleID = article.databaseID
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@ -70,24 +69,16 @@ private extension AuthorsTable {
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}
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}
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func articlesMissingAuthors(_ articles: Set<Article>) -> Set<Article> {
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func articlesNeedingAuthors(_ articles: Set<Article>) -> Set<Article> {
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return articles.filter{ (article) -> Bool in
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if let _ = article.authors {
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return false
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}
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if articleIDsWithNoAuthors.contains(article.databaseID) {
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return false
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}
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return true
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}
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// If article.authors is nil and article is not known to have zero authors, include it in the set.
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let articlesWithNoAuthors = articles.withNilProperty(\Article.authors)
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return Set(articlesWithNoAuthors.filter { !articleIDsWithNoAuthors.contains($0.databaseID) })
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}
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func fetchAuthorsForArticleIDs(_ articleIDs: Set<String>, _ database: FMDatabase) -> [String: Set<Author>]? {
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let lookupValues = authorsLookupTable.fetchLookupValues(articleIDs, database: database)
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let lookupValueDictionary = authorsLookupTable.fetchLookupTableDictionary(articleIDs, database)
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let authorIDs = Set(lookupValues.map { $0.primaryID })
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if authorIDs.isEmpty {
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return nil
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@ -48,3 +48,16 @@ extension Article {
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return d.copy() as! NSDictionary
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}
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}
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extension Set where Element == Article {
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func withNilProperty<T>(_ keyPath: KeyPath<Article,T?>) -> Set<Article> {
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return Set(filter{ $0[keyPath: keyPath] == nil })
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}
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func articleIDs() -> Set<String> {
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return Set(map { $0.databaseID })
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}
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}
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@ -121,7 +121,7 @@ private extension StatusesTable {
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func fetchAndCacheStatusesForArticles(_ articles: Set<Article>, _ database: FMDatabase) {
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fetchAndCacheStatusesForArticleIDs(articleIDsFromArticles(articles), database)
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fetchAndCacheStatusesForArticleIDs(articles.articleIDs(), database)
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}
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func fetchAndCacheStatusesForArticleIDs(_ articleIDs: Set<String>, _ database: FMDatabase) {
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@ -210,11 +210,6 @@ private extension StatusesTable {
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// MARK: Utilities
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func articleIDsFromArticles(_ articles: Set<Article>) -> Set<String> {
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return Set(articles.map { $0.databaseID })
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}
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func articleIDsMissingCachedStatuses(_ articleIDs: Set<String>) -> Set<String> {
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return Set(articleIDs.filter { !cache.objectWithIDIsCached($0) })
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@ -222,13 +217,7 @@ private extension StatusesTable {
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func articlesMissingStatuses(_ articles: Set<Article>) -> Set<Article> {
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let missing = articles.flatMap { (article) -> Article? in
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if article.status == nil {
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return article
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}
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return nil
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}
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return Set(missing)
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return articles.withNilProperty(\Article.status)
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}
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}
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@ -13,10 +13,6 @@ import Data
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// Article->tags is a many-to-many relationship.
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// Since a tag is just a simple string, the tags table and the lookup table are the same table.
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//
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// Tags — and the non-existence of tags — are cached, once fetched, for the lifetime of the run.
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// This uses some extra memory but cuts way down on the amount of database time spent
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// maintaining the tags table.
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//
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// CREATE TABLE if not EXISTS tags(tagName TEXT NOT NULL, articleID TEXT NOT NULL, PRIMARY KEY(tagName, articleID));
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// CREATE INDEX if not EXISTS tags_tagName_index on tags (tagName COLLATE NOCASE);
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@ -26,194 +22,214 @@ final class TagsTable: DatabaseTable {
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let name: String
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let queue: RSDatabaseQueue
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private var articleIDCache = [String: TagNameSet]() // articleID: tags
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private var articleIDsWithNoTags = Set<String>
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let lookupTable: LookupTable
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init(name: String, queue: RSDatabaseQueue) {
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self.name = name
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self.queue = queue
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self.lookupTable = LookupTable(name: DatabaseTableName.tags, primaryKey: DatabaseKey.tagName, foreignKey: DatabaseKey.articleID)
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}
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func saveTagsForArticles(_ articles: Set<Article>) {
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func attachTags(_ articles: Set<Article>, _ database: FMDatabase) {
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var articlesToSaveTags = Set<Article>()
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var articlesToRemoveTags = Set<Article>()
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articles.forEach { (oneArticle) in
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if articleTagsMatchCache(oneArticle) {
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return
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}
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if let tags = oneArticle.tags {
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articlesToSaveTags.insert(oneArticle)
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}
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else {
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articlesToRemoveTags.insert(oneArticle)
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}
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guard let lookupTableDictionary = lookupTable.fetchLookupTableDictionary(articleIDs, database) else {
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return
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}
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if !articlesToSaveTags.isEmpty {
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updateTagsForArticles(articlesToSaveTags)
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}
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if !articlesToRemoveTags.isEmpty {
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removeArticleFromTags(articlesToRemoveTags)
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for article in articles {
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if let lookupValues = lookupTableDictionary[article.databaseID] {
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article.tags = lookupValues.tags()
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}
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}
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}
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// func saveTagsForArticles(_ articles: Set<Article>) {
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//
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// var articlesToSaveTags = Set<Article>()
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// var articlesToRemoveTags = Set<Article>()
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//
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// articles.forEach { (oneArticle) in
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//
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// if articleTagsMatchCache(oneArticle) {
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// return
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// }
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// if let tags = oneArticle.tags {
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// articlesToSaveTags.insert(oneArticle)
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// }
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// else {
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// articlesToRemoveTags.insert(oneArticle)
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// }
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// }
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//
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// if !articlesToSaveTags.isEmpty {
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// updateTagsForArticles(articlesToSaveTags)
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// }
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//
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// if !articlesToRemoveTags.isEmpty {
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// removeArticleFromTags(articlesToRemoveTags)
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// }
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// }
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}
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private extension TagsTable {
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func cacheTagsForArticle(_ article: Article, tags: TagNameSet) {
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// func cacheTagsForArticle(_ article: Article, tags: TagNameSet) {
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//
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// articleIDsWithNoTags.remove(article.articleID)
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// articleIDCache[article.articleID] = tags
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// }
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//
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// func cachedTagsForArticleID(_ articleID: String) -> TagNameSet? {
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//
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// return articleIDsCache[articleID]
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// }
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//
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// func articleTagsMatchCache(_ article: Article) -> Bool {
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//
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// if let tags = article.tags {
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// return tags == articleIDCache[article.articleID]
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// }
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// return articleIDIsKnowToHaveNoTags(article.articleID)
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// }
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//
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// func articleIDIsKnownToHaveNoTags(_ articleID: String) -> Bool {
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//
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// return articleIDsWithNoTags.contains(articleID)
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// }
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//
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// func removeTagsFromCacheForArticleID(_ articleID: String) {
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//
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// articleIDsCache[oneArticleID] = nil
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// articleIDsWithNoTags.insert(oneArticleID)
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// }
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//
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// func removeArticleFromTags(_ articles: Set<Article>) {
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//
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// var articleIDsToRemove = [String]()
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//
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// articles.forEach { (oneArticle) in
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// let oneArticleID = oneArticle.articleID
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// if articleIDIsKnownToHaveNoTags(oneArticle) {
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// return
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// }
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// articleIDsToRemove += oneArticleID
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// removeTagsFromCacheForArticleID(oneArticleID)
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// }
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//
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// if !articleIDsToRemove.isEmpty {
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// queue.update { (database) in
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// database.rs_deleteRowsWhereKey(DatabaseKey.articleID, inValues: articleIDsToRemove, tableName: DatabaseTableName.tags)
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// }
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// }
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// }
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//
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// typealias TagsTable = [String: TagNameSet] // [articleID: Set<tagName>]
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//
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// func updateTagsForArticles(_ articles: Set<Article>) {
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//
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// var tagsForArticleIDs = TagsTable()
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// articles.forEach { (oneArticle)
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// if let tags = oneArticle.tags {
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// cacheTagsForArticle(oneArticle, tags)
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// tagsForArticleIDs[oneArticle.articleID] = oneArticle.tags
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// }
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// else {
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// assertionFailure("article must have tags")
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// }
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// }
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//
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// if tagsForArticleIDs.isEmpty { // Shouldn’t be empty
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// return
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// }
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// let articleIDs = tagsForArticleIDs.keys
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//
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// queue.update { (database) in
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//
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// let existingTags = self.fetchTagsForArticleIDs(articleIDs, database: database)
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// self.syncIncomingAndExistingTags(incomingTags: tagsForArticleIDs, existingTags: existingTags, database: database)
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// }
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// }
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//
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// func syncIncomingAndExistingTags(incomingTags: TagsTable, existingTags: TagsTable, database: database) {
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//
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// for (oneArticleID, oneTagNames) in incomingTags {
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// if let existingTagNames = existingTags[oneArticleID] {
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// syncIncomingAndExistingTagsForArticleID(oneArticleID, incomingTagNames: oneTagNames, existingTagNames: existingTagNames, database: database)
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// }
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// else {
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// saveIncomingTagsForArticleID(oneArticleID, tagNames: oneTagNames, database: database)
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// }
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// }
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// }
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//
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// func saveIncomingTagsForArticleID(_ articleID: String, tagNames: TagNameSet, database: FMDatabase) {
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//
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// // No existing tags in database. Simple save.
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//
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// for oneTagName in tagNames {
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// let oneDictionary = [DatabaseTableName.articleID: articleID, DatabaseTableName.tagName: oneTagName]
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// database.rs_insertRow(with: oneDictionary, insertType: .OrIgnore, tableName: DatabaseTableName.tags)
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// }
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// }
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//
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// func syncingIncomingAndExistingTagsForArticleID(_ articleID: String, incomingTagNames: TagNameSet, existingTagNames: TagNameSet, database: FMDatabase) {
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//
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// if incomingTagNames == existingTagNames {
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// return
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// }
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//
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// var tagsToRemove = TagNameSet()
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// for oneExistingTagName in existingTagNames {
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// if !incomingTagNames.contains(oneExistingTagName) {
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// tagsToRemove.insert(oneExistingTagName)
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// }
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// }
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//
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// var tagsToAdd = TagNameSet()
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// for oneIncomingTagName in incomingTagNames {
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// if !existingTagNames.contains(oneIncomingTagName) {
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// tagsToAdd.insert(oneIncomingTagName)
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// }
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// }
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//
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// if !tagsToRemove.isEmpty {
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// let placeholders = NSString.rs_SQLValueListWithPlaceholders
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// let sql = "delete from \(DatabaseTableName.tags) where \(DatabaseKey.articleID) = ? and \(DatabaseKey.tagName) in "
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// database.executeUpdate(sql, withArgumentsIn: [articleID, ])
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// }
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// }
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//
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// func fetchTagsForArticleIDs(_ articleIDs: Set<String>, database: FMDatabase) -> TagsTable {
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//
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// var tagSpecifiers = TagsTable()
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//
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// guard let rs = database.rs_selectRowsWhereKey(DatabaseKey.articleID, inValues: Array(articleIDs), tableName: DatabaseTableName.tags) else {
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// return tagSpecifiers
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// }
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//
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// while rs.next() {
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//
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// guard let oneTagName = rs.string(forColumn: DatabaseKey.tagName), let oneArticleID = rs.string(forColumn: DatabaseKey.articleID) else {
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// continue
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// }
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// if tagSpecifiers[oneArticleID] == nil {
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// tagSpecifiers[oneArticleID] = Set([oneTagName])
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// }
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// else {
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// tagSpecifiers[oneArticleID]!.insert(oneTagName)
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// }
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// }
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//
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// return tagSpecifiers
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// }
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}
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articleIDsWithNoTags.remove(article.articleID)
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articleIDCache[article.articleID] = tags
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}
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private extension Set where Element == LookupValue {
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func cachedTagsForArticleID(_ articleID: String) -> TagNameSet? {
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func tags() -> Set<String> {
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return articleIDsCache[articleID]
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}
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func articleTagsMatchCache(_ article: Article) -> Bool {
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if let tags = article.tags {
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return tags == articleIDCache[article.articleID]
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}
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return articleIDIsKnowToHaveNoTags(article.articleID)
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}
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func articleIDIsKnownToHaveNoTags(_ articleID: String) -> Bool {
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return articleIDsWithNoTags.contains(articleID)
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}
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func removeTagsFromCacheForArticleID(_ articleID: String) {
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articleIDsCache[oneArticleID] = nil
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articleIDsWithNoTags.insert(oneArticleID)
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}
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func removeArticleFromTags(_ articles: Set<Article>) {
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var articleIDsToRemove = [String]()
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articles.forEach { (oneArticle) in
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let oneArticleID = oneArticle.articleID
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if articleIDIsKnownToHaveNoTags(oneArticle) {
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return
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}
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articleIDsToRemove += oneArticleID
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removeTagsFromCacheForArticleID(oneArticleID)
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}
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if !articleIDsToRemove.isEmpty {
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queue.update { (database) in
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database.rs_deleteRowsWhereKey(DatabaseKey.articleID, inValues: articleIDsToRemove, tableName: DatabaseTableName.tags)
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}
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}
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}
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typealias TagsTable = [String: TagNameSet] // [articleID: Set<tagName>]
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func updateTagsForArticles(_ articles: Set<Article>) {
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var tagsForArticleIDs = TagsTable()
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articles.forEach { (oneArticle)
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if let tags = oneArticle.tags {
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cacheTagsForArticle(oneArticle, tags)
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tagsForArticleIDs[oneArticle.articleID] = oneArticle.tags
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}
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else {
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assertionFailure("article must have tags")
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}
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}
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if tagsForArticleIDs.isEmpty { // Shouldn’t be empty
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return
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}
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let articleIDs = tagsForArticleIDs.keys
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queue.update { (database) in
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let existingTags = self.fetchTagsForArticleIDs(articleIDs, database: database)
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self.syncIncomingAndExistingTags(incomingTags: tagsForArticleIDs, existingTags: existingTags, database: database)
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}
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}
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func syncIncomingAndExistingTags(incomingTags: TagsTable, existingTags: TagsTable, database: database) {
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for (oneArticleID, oneTagNames) in incomingTags {
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if let existingTagNames = existingTags[oneArticleID] {
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syncIncomingAndExistingTagsForArticleID(oneArticleID, incomingTagNames: oneTagNames, existingTagNames: existingTagNames, database: database)
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}
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else {
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saveIncomingTagsForArticleID(oneArticleID, tagNames: oneTagNames, database: database)
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}
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}
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}
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func saveIncomingTagsForArticleID(_ articleID: String, tagNames: TagNameSet, database: FMDatabase) {
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// No existing tags in database. Simple save.
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for oneTagName in tagNames {
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let oneDictionary = [DatabaseTableName.articleID: articleID, DatabaseTableName.tagName: oneTagName]
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database.rs_insertRow(with: oneDictionary, insertType: .OrIgnore, tableName: DatabaseTableName.tags)
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}
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}
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func syncingIncomingAndExistingTagsForArticleID(_ articleID: String, incomingTagNames: TagNameSet, existingTagNames: TagNameSet, database: FMDatabase) {
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if incomingTagNames == existingTagNames {
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return
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}
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var tagsToRemove = TagNameSet()
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for oneExistingTagName in existingTagNames {
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if !incomingTagNames.contains(oneExistingTagName) {
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tagsToRemove.insert(oneExistingTagName)
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}
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}
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var tagsToAdd = TagNameSet()
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for oneIncomingTagName in incomingTagNames {
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if !existingTagNames.contains(oneIncomingTagName) {
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tagsToAdd.insert(oneIncomingTagName)
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}
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}
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if !tagsToRemove.isEmpty {
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let placeholders = NSString.rs_SQLValueListWithPlaceholders
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let sql = "delete from \(DatabaseTableName.tags) where \(DatabaseKey.articleID) = ? and \(DatabaseKey.tagName) in "
|
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database.executeUpdate(sql, withArgumentsIn: [articleID, ])
|
||||
}
|
||||
}
|
||||
|
||||
func fetchTagsForArticleIDs(_ articleIDs: Set<String>, database: FMDatabase) -> TagsTable {
|
||||
|
||||
var tagSpecifiers = TagsTable()
|
||||
|
||||
guard let rs = database.rs_selectRowsWhereKey(DatabaseKey.articleID, inValues: Array(articleIDs), tableName: DatabaseTableName.tags) else {
|
||||
return tagSpecifiers
|
||||
}
|
||||
|
||||
while rs.next() {
|
||||
|
||||
guard let oneTagName = rs.string(forColumn: DatabaseKey.tagName), let oneArticleID = rs.string(forColumn: DatabaseKey.articleID) else {
|
||||
continue
|
||||
}
|
||||
if tagSpecifiers[oneArticleID] == nil {
|
||||
tagSpecifiers[oneArticleID] = Set([oneTagName])
|
||||
}
|
||||
else {
|
||||
tagSpecifiers[oneArticleID]!.insert(oneTagName)
|
||||
}
|
||||
}
|
||||
|
||||
return tagSpecifiers
|
||||
return Set(flatMap{ $0.primaryID })
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@ -11,12 +11,19 @@ import Foundation
|
||||
// Implement a lookup table for a many-to-many relationship.
|
||||
// Example: CREATE TABLE if not EXISTS authorLookup (authorID TEXT NOT NULL, articleID TEXT NOT NULL, PRIMARY KEY(authorID, articleID));
|
||||
// authorID is primaryKey; articleID is foreignKey.
|
||||
//
|
||||
// foreignIDsWithNoRelationship: caches the foreignIDs where it’s known that there’s no relationship.
|
||||
// lookupsByForeignID: caches the LookupValues for a foreignID.
|
||||
|
||||
public struct LookupTable {
|
||||
typealias LookupTableDictionary = [String: Set<LookupValue>] // key is foreignID
|
||||
|
||||
public final class LookupTable {
|
||||
|
||||
let name: String
|
||||
let primaryKey: String
|
||||
let foreignKey: String
|
||||
private var foreignIDsWithNoRelationship = Set<String>()
|
||||
private var lookupsByForeignID = LookupTableDictionary()
|
||||
|
||||
public init(name: String, primaryKey: String, foreignKey: String) {
|
||||
|
||||
@ -25,17 +32,94 @@ public struct LookupTable {
|
||||
self.foreignKey = foreignKey
|
||||
}
|
||||
|
||||
public func fetchLookupValues(_ foreignIDs: Set<String>, database: FMDatabase) -> Set<LookupValue> {
|
||||
public func fetchLookupTableDictionary(_ foreignIDs: Set<String>, _ database: FMDatabase) -> LookupTableDictionary? {
|
||||
|
||||
guard let resultSet = database.rs_selectRowsWhereKey(foreignKey, inValues: Array(foreignIDs), tableName: name) else {
|
||||
return Set<LookupValue>()
|
||||
let foreignIDsToLookup = foreignIDs.subtracting(foreignIDsWithNoRelationship)
|
||||
if foreignIDsToLookup.isEmpty {
|
||||
return nil
|
||||
}
|
||||
return lookupValuesWithResultSet(resultSet)
|
||||
|
||||
var lookupValues = Set<LookupValue>()
|
||||
var foreignIDsToFetchFromDatabase = Set<String>()
|
||||
|
||||
// Pull from cache.
|
||||
for oneForeignID in foreignIDsToLookup {
|
||||
if let cachedLookups = lookupsByForeignID[oneForeignID] {
|
||||
lookupValues.formUnion(cachedLookups)
|
||||
}
|
||||
else {
|
||||
foreignIDsToFetchFromDatabase.insert(oneForeignID)
|
||||
}
|
||||
}
|
||||
|
||||
if !foreignIDsToFetchFromDatabase.isEmpty {
|
||||
if let resultSet = database.rs_selectRowsWhereKey(foreignKey, inValues: Array(foreignIDsToLookup), tableName: name) {
|
||||
lookupValues.formUnion(lookupValuesWithResultSet(resultSet))
|
||||
}
|
||||
}
|
||||
|
||||
cacheNotFoundForeignIDs(lookupValues, foreignIDsToFetchFromDatabase)
|
||||
cacheLookupValues(lookupValues)
|
||||
|
||||
return lookupTableDictionary(with: lookupValues)
|
||||
}
|
||||
|
||||
public func removeLookupsForForeignIDs(_ foreignIDs: Set<String>, _ database: FMDatabase) {
|
||||
|
||||
let foreignIDsToRemove = foreignIDs.subtracting(foreignIDsWithNoRelationship)
|
||||
if foreignIDsToRemove.isEmpty {
|
||||
return
|
||||
}
|
||||
|
||||
for oneForeignID in foreignIDsToRemove {
|
||||
lookupsByForeignID[oneForeignID] = nil
|
||||
}
|
||||
foreignIDsWithNoRelationship.formUnion(foreignIDsToRemove)
|
||||
|
||||
database.rs_deleteRowsWhereKey(foreignKey, inValues: Array(foreignIDsToRemove), tableName: name)
|
||||
}
|
||||
}
|
||||
|
||||
private extension LookupTable {
|
||||
|
||||
func addToLookupTableDictionary(_ lookupValues: Set<LookupValue>, _ table: inout LookupTableDictionary) {
|
||||
|
||||
for lookupValue in lookupValues {
|
||||
let foreignID = lookupValue.foreignID
|
||||
let primaryID = lookupValue.primaryID
|
||||
if table[foreignID] == nil {
|
||||
table[foreignID] = Set([primaryID])
|
||||
}
|
||||
else {
|
||||
table[foreignID]!.insert(primaryID)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func lookupTableDictionary(with lookupValues: Set<LookupValue>) -> LookupTableDictionary {
|
||||
|
||||
var d = LookupTableDictionary()
|
||||
addToLookupTableDictionary(lookupValues, &d)
|
||||
return d
|
||||
}
|
||||
|
||||
func cacheLookupValues(_ lookupValues: Set<LookupValue>) {
|
||||
|
||||
addToLookupTableDictionary(lookupValues, &lookupsByForeignID)
|
||||
}
|
||||
|
||||
func cacheNotFoundForeignIDs(_ lookupValues: Set<LookupValue>, _ foreignIDs: Set<String>) {
|
||||
|
||||
// Note where nothing was found, and cache the foreignID in foreignIDsWithNoRelationship.
|
||||
|
||||
let foundForeignIDs = Set(lookupValues.map { $0.foreignID })
|
||||
for foreignID in foreignIDs {
|
||||
if !foundForeignIDs.contains(foreignID) {
|
||||
foreignIDsWithNoRelationship.insert(foreignID)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func lookupValuesWithResultSet(_ resultSet: FMResultSet) -> Set<LookupValue> {
|
||||
|
||||
return resultSet.mapToSet(lookupValueWithRow)
|
||||
@ -71,3 +155,4 @@ public struct LookupValue: Hashable {
|
||||
return lhs.primaryID == rhs.primaryID && lhs.foreignID == rhs.foreignID
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user