Add ReVIEW::Book::Cache and use it in ReVIEW::Book::ImageFinder
#1919
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#1916 の対応のため、Dir.glob等でファイルシステムを読み込んだ結果をキャッシュするようにします。
そのためにクラスとして
ReVIEW::Book::Cacheを追加してます。@book単位で行っているので、@bookを作り直している場合には使われません@bookを使いまわしているような場合、キャッシュされた結果が使われるので誤動作する危険性があります@book.cache.resetすれば再初期化されますReVIEW::Book::CacheのインターフェースはRailsのRails.cache.fetchを真似ていますが、expires等は不要そうなのでありません関連