Refactoring

src/application/application.rs

@@ -1,34 +1,45 @@
+use crate::application::config::{Config, Storage};
 use crate::application::services::books::Books;
-use crate::application::config::Config;
 use crate::domain::book::Book;
 use crate::domain::repository::{BookFilter, Repository};
+use crate::infrastructure::repository::inmem;
+use std::sync::{Arc, Mutex};
 
-pub struct Application<R: Repository<Book, BookFilter>> {
-    pub books: Books<R>,
+pub struct Application {
     cfg: Config,
+    pub repo: Arc<Mutex<Box<dyn Repository<Book, BookFilter> + 'static>>>,
+    pub srv: Books,
 }
 
-impl<R: Repository<Book, BookFilter> +'static> Application<R> {
-    pub fn new(repo: R) -> Self {
+impl Application {
+    pub fn new() -> Self {
         let cfg = Config::new();
 
-        Application {
-            books: Books::new(repo, (&cfg.books_dir).into(), "https://foo.bar/".to_string()),
+        let repo: Box<dyn Repository<Book, BookFilter>> = match cfg.storage {
+            Storage::InMemory => Box::new(inmem::books::BookRepository::new()),
+        };
+        let repo = Arc::new(Mutex::new(repo));
+        let srv = Books::new(
+            repo.clone(),
+            cfg.books_dir.clone().into(),
+            "https://foo.bar".to_string(),
+        );
 
-            cfg
+        Application {
+            cfg,
+            repo,
+            srv
         }
     }
 
     pub fn start(&mut self) -> Result<(), String> {
-        self.books.add_books_from_path();
+        self.srv.add_books_from_path();
 
         if self.cfg.watcher {
-            return match self.books.watch_dir() {
-                Ok(_) => {Ok(())}
-                Err(e) => {
-                    Err(format!("Error start watching books: {}", e))
-                }
-            }
+            return match self.srv.watch_dir() {
+                Ok(_) => Ok(()),
+                Err(e) => Err(format!("Error start watching books: {}", e)),
+            };
         }
 
         Ok(())

src/application/config.rs

@@ -1,4 +1,7 @@
 use envman::EnvMan;
+use std::error::Error;
+use std::fmt;
+use std::str::FromStr;
 
 #[derive(EnvMan)]
 pub struct Config {
@@ -6,6 +9,8 @@ pub struct Config {
     pub books_dir: String,
     #[envman(default = "true")]
     pub watcher: bool,
+    #[envman(default = "inmemory")]
+    pub storage: Storage,
 }
 
 impl Config {
@@ -13,3 +18,31 @@ impl Config {
         Config::load_from_env().expect("Failed to load configuration")
     }
 }
+
+pub enum Storage {
+    InMemory,
+}
+
+#[derive(Debug)]
+pub struct ParseStorageError {
+    details: String,
+}
+
+impl fmt::Display for ParseStorageError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Unknown storage type: {}", self.details)
+    }
+}
+
+impl Error for ParseStorageError {}
+
+impl FromStr for Storage {
+    type Err = ParseStorageError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "inmemory" => Ok(Storage::InMemory),
+            _ => Err(ParseStorageError { details: s.into() }),
+        }
+    }
+}

src/application/services/books.rs

@@ -10,19 +10,20 @@ use url::Url;
 
 const AUTHOR_URL_PREFIX: &str = "author";
 
-pub struct Books<R: Repository<Book, BookFilter>> {
-    pub repo: Arc<Mutex<R>>,
+pub struct Books {
+    pub repo: Arc<Mutex<Box<dyn Repository<Book, BookFilter> + 'static>>>,
     root: PathBuf,
     base_url: Url,
 }
 
-impl<R: Repository<Book, BookFilter>> Books<R>
-where
-    R: 'static,
-{
-    pub fn new(repo: R, root: PathBuf, base_url: String) -> Self {
+impl Books {
+    pub fn new(
+        repo: Arc<Mutex<Box<dyn Repository<Book, BookFilter> + 'static>>>,
+        root: PathBuf,
+        base_url: String,
+    ) -> Self {
         Books {
-            repo: Arc::new(Mutex::new(repo)),
+            repo,
             root,
             base_url: Url::parse(&base_url).unwrap(),
         }
@@ -68,7 +69,15 @@ where
 
     pub fn add_books_from_path(&mut self) {
         let iter = fs::Loader::new(PathBuf::from(&self.root));
-        self.repo.lock().unwrap().bulk_add(iter);
+
+        match self.repo.lock() {
+            Ok(mut repo) => {
+                for book in iter {
+                    repo.add(book);
+                }
+            }
+            Err(err) => eprintln!("{}", err),
+        }
     }
 
     pub fn watch_dir(&mut self) -> Result<(), io::Error> {

src/domain/repository.rs

@@ -1,10 +1,10 @@
-pub trait Repository<T, F>: Send + Sync + Sized{
+pub trait Repository<T, F>: Send + Sync {
     fn add(&mut self, item: T);
-    fn bulk_add<I>(&mut self, items: I) where I: IntoIterator<Item = T>;
+    fn bulk_add(&mut self, items: Vec<T>);
     fn remove(&mut self, item: T);
     fn get(&self, id: String) -> Option<T>;
     fn update(&mut self, item: T);
-    fn filter(&self, filter: F) -> Box<dyn Iterator<Item = T>>;
+    fn filter(&self, filter: F) -> Box<dyn Iterator<Item = T> + '_>;
 }
 
 pub struct BookFilter {

src/infrastructure/repository/inmem/books.rs

@@ -1,4 +1,3 @@
-use crate::domain::author::Author;
 use crate::domain::repository::{BookFilter, Repository};
 use crate::domain::{author, book};
 use std::collections::HashMap;
@@ -61,7 +60,7 @@ impl Into<book::Book> for Book {
 
 pub struct BookRepository {
     books: Vec<Book>,
-    authors: HashMap<Uuid, Author>,
+    authors: HashMap<Uuid, author::Author>,
     author_uniques: HashMap<String, Uuid>,
 }
 
@@ -110,10 +109,7 @@ impl Repository<book::Book, BookFilter> for BookRepository {
         self.books.push(item.into());
     }
 
-    fn bulk_add<I>(&mut self, items: I)
-    where
-        I: IntoIterator<Item = book::Book>,
-    {
+    fn bulk_add(&mut self, items: Vec<book::Book>) {
         items.into_iter().for_each(|item| {
             if self.get(item.id.to_string()).is_none() {
                 self.add(item)

src/lib.rs

@@ -1,13 +1,12 @@
 use crate::application::application::Application;
-use crate::infrastructure::repository::inmem::books::BookRepository;
 
 pub mod domain;
 
 mod application;
 pub mod infrastructure;
 
-pub fn demo() -> Application<BookRepository> {
-    let mut app = Application::new(BookRepository::new());
+pub fn demo() -> Application {
+    let mut app = Application::new();
     app.start().expect("Application initialization failed");
 
     app

src/main.rs

@@ -22,11 +22,11 @@ fn main() {
         updated: None,
     };
 
-    let res = app.books.books_feed(filter);
+    let res = app.srv.books_feed(filter);
     println!("{}", to_xml_string(&res).unwrap());
 
     if let Some(book) = res.entry.iter().next() {
-        let book = app.books.repo.lock().unwrap().get(book.id.to_string().clone());
+        let book = app.repo.lock().unwrap().get(book.id.to_string().clone());
         println!("{:?}", book.unwrap().author);
     }