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+@startuml
+' skinparam linetype ortho
+' skinparam groupInheritance 2
+allowmixing
+
+package subscriptionsAPI <<Frame>> {
+    package subscriptionDataAccessLayer <<Frame>> {
+        class SubscriptionDataAccessService <<@Repository>> {
+            <<create>> SubscriptionDataAccessService(JpaTemplate jpaTemplate)
+            int uploadSubscriptions(String username, List<SubscriptionAction> subscriptions)
+            List<String> getSubscriptions(String username)
+            List<String> getSubscriptionsSince(String username, LocalDateTime time)
+            int addSubscriptions(String username, List<SubscriptionAction> addedSubscriptions)
+            int removeSubscriptions(String username, List<SubscriptionAction> removedSubscriptions)
+            List<SubscriptionTitles> getTitles(String username)
+        }
+
+        interface SubscriptionDao {
+            int uploadSubscriptions(String username, List<SubscriptionAction> subscriptions)
+            List<String> getSubscriptions(String username)
+            List<String> getSubscriptionsSince(String username, LocalDateTime time)
+            int addSubscriptions(String username, List<SubscriptionAction> addedSubscriptions)
+            int removeSubscriptions(String username, List<SubscriptionAction> removedSubscriptions)
+            List<SubscriptionTitles> getTitles(String username)
+        }
+    }
+
+    package subscriptionService <<Frame>> {
+        class SubscriptionService <<@Service>> {
+            <<create>> SubscriptionService(SubscriptionDao subscriptionDao)
+            int uploadSubscriptions(String username, List<SubscriptionAction> subscriptions)
+            List<String> getSubscriptions(String username)
+            List<String> getSubscriptionsSince(String username, LocalDateTime time)
+            int addSubscriptions(String username, List<SubscriptionAction> addedSubscriptions)
+            int removeSubscriptions(String username, List<SubscriptionAction> removedSubscriptions)
+            List<SubscriptionTitles> getTitles(String username)
+        }
+    }
+
+    package subscriptionController <<Frame>> {
+        class SubscriptionController <<@Controller>>{
+            ' @Autowired
+            <<create>> SubscriptionController(SubscriptionService subscriptionService) 
+            ' @GetMapping
+            ResponseEntity<List<String>> getSubscriptions(String username, String deviceID, String functionJSONP)  
+            ' @PutMapping
+            ResponseEntity<String> uploadSubscriptions(String username, String deviceID, List<String> subscriptions) 
+            ' @PostMapping
+            ResponseEntity<SubscriptionDelta> applySubscriptionDelta(String username, String deviceID, SubscriptionDelta delta) 
+            ' @GetMapping
+            ResponseEntity<SubscriptionDelta> getSubscriptionDelta(String username, String deviceID, long since) 
+            ResponseEntity<List<SubscriptionTitles>> getTitles(String username, String deviceID)
+        }
+
+        class SubscriptionTitles {
+            <<create>> SubscriptionTitles(Subscription subscription, List<EpisodeActionPost> episodeTitles)
+            Subscription getSubscription()
+            List<EpisodeActionPost> getEpisodesTitles()
+        }
+
+        class SubscriptionDelta {
+            <<create>> SubscriptionDelta(List<String> add, List<String> remove) 
+            List<String> getRemove() 
+            LocalDate getTimestamp() 
+            List<List<String>> getUpdate_urls() 
+        }
+    }
+
+}
+
+package episodeActionsAPI <<Frame>> {
+    package episodeActionDataAccessLayer <<Frame>> {
+        class EpisodeActionDataAccessService <<@Repository>> {
+            <<create>> EpisodeActionDataAccessService (JpaTemplate jpaTemplate)
+            long addEpisodeActions(String username, List<EpisodeActionPost> episodeActionPosts)
+            List<EpisodeActionPost> getEpisodeActions(String username)
+            List<EpisodeActionPost> getEpisodeActionsOfPodcast(String username, String podcastURL)
+            List<EpisodeActionPost> getEpisodeActionsSince(String username, LocalDateTime since)
+            List<EpisodeActionPost> getEpisodeActionsOfPodcastSince(String username, String podcastURL, LocalDateTime since)
+        }
+        
+        interface EpisodeActionDao {
+            long addEpisodeActions(String username, List<EpisodeActionPost> episodeActionPosts)
+            List<EpisodeActionPost> getEpisodeActions(String username)
+            List<EpisodeActionPost> getEpisodeActionsOfPodcast(String username, String podcastURL)
+            List<EpisodeActionPost> getEpisodeActionsSince(String username, LocalDateTime since)
+            List<EpisodeActionPost> getEpisodeActionsOfPodcastSince(String username, String podcastURL, LocalDateTime since)
+        }
+    }
+
+    package episodeActionService <<Frame>> {
+        class EpisodeActionService <<@Service>> {
+            <<create>> EpisodeActionService (EpisodeActionDao episodeActionDao)
+            LocalDateTime addEpisodeActions(String username, List<EpisodeActionPosts> episodeActionPosts)
+            List<EpisodeActionPost> getEpisodeActions(String username)
+            List<EpisodeActionPost> getEpisodeActionsOfPodcast(String username, String podcastURL)
+            List<EpisodeActionPost> getEpisodeActionsSince(String username, LocalDateTime since)
+            List<EpisodeActionPost> getEpisodeActionsOfPodcastSince(String username, String podcastURL, LocalDateTime since)  
+        }
+    }
+
+    package episodeActionController <<Frame>> {
+        class EpisodeActionController <<@Controller>>{
+            <<create>> EpisodeActionController (EpisodeActionService episodeActionService)
+            ResponseEntity<EpisodeActionPostResponse> addEpisodeActions(String username, EpisodeActionPostRequest episodeActionPostRequest)
+            ResponseEntity<EpisodeActionGetResponse> getEpisodeActions(String username, String deviceID, boolean aggregated)
+            ResponseEntity<EpisodeActionGetResponse> getEpisodeActionsOfPodcast(String username, String podcastURL, String deviceID, boolean aggregated)
+            ResponseEntity<EpisodeActionGetResponse> getEpisodeActionsSince(String username, String deviceID, long since, boolean aggregated)
+            ResponseEntity<EpisodeActionGetResponse> getEpisodeActionsOfPodcastSince(String username, String podcastURL, String deviceID, long since, boolean aggregated)
+        }
+
+        class EpisodeActionPostResponse {
+            <<create>> EpisodeActionPostResponse(List<Pair<String, String>> updateURLs)
+            long getTimestamp()
+            List<Pair<String, String>> getUpdatedURLs()
+        }
+
+        class EpisodeActionPost {
+            <<create>> EpisodeActionPost(String podcastURL, String episodeURL, Action action, LocalDateTime timestamp, int started, int position)
+            String getPodcastURL()
+            String getEpisodeURL()
+            int getGUID()
+            Action getAction()
+            LocalDateTime getTimestamp()
+            int getStarted()
+            int getPosition()
+            EpisodeAction getEpisodeAction()
+        }
+
+        class EpisodeActionPostRequest {
+            <<create>> EpisodeActionPostRequest(List<EpisodeActionPost> episodeActionPosts)
+            List<EpisodeActionPost> getEpisodeActionPosts()
+        }
+
+        class EpisodeActionGetResponse {
+            <<create>> EpisodeActionGetResponse(List<EpisodeActionPost> episodeActionPosts)
+            List<EpisodeActionPost> getEpisodeActionPosts()
+            long getTimestamp()
+        }
+    }
+}
+
+package authenticationAPI <<Frame>> {
+    package authenticationDataAccessLayer <<Frame>> {
+        ' interface AuthenticationDao {
+        '     String login(String username)
+        '     int logout(String username)
+        ' }
+        
+        ' class AuthenticationDataAccessService <<@Respository>> {
+        '     <<create>> AuthenticationDataAccessService(JpaTemplate jpaTemplate)
+        '     String login(String username)
+        '     int logout(String username)
+        ' }
+
+        interface UserDetailsManager {
+            void createUser(UserDetails userDetails)
+            void changePassword(String oldPassword, String newPassword)
+            void deleteUser(String username)
+            void updateUser(UserDetails user)
+            boolean userExists(String username)
+        }
+        note left 
+            Aus org.springframework.security.provisioning
+            - liefert Methoden zum Erstellen neuer User
+            und zum Aktualisieren bestehender.
+        end note
+
+        class JdbcUserDetailsManager <<@Repository>> {
+            <<create>> JdbcUserDetailsManager(DataSource dataSource)
+            void createUser(UserDetails user)
+            void changePassword(String oldPassword, String newPassword)
+            void deleteUser(String username)
+            void updateUser(UserDetails user)
+            boolean userExists(String username)
+        }
+        note right
+            User Management Service aus dem Paket
+            org.springframework.security.provisioning
+            der CRUD Operationen für User bereitstellt.
+            Hier sind nur die relevanten Methoden modelliert.
+        end note
+    }
+
+    package authenticationService <<Frame>> {
+        class AuthenticationService <<@Service>> {
+            --
+            <<create>> AuthenticationService(UserDetailsManager userDetailsManager)
+            List<String> verifyLogin(String username)
+            int logout(String username)
+            int forgotPassword(ForgotPasswordRequest forgotPasswordRequest)
+            .. via JdbcUserDetailsManager ..
+            int resetPassword(String username, RequestWithPassword requestWithPassword)
+            int registerUser(UserDetails user)
+            int changePassword(String username, ChangePasswordRequest changePasswordRequest)
+            int deleteUser(String username, RequestWithPassword requestWithPassword)
+        }
+        
+        class JavaMailSenderImpl {}
+        note left
+            Aus org.springframework.mail.javamail.
+            Implementierung des JavaMailSender Interfaces,
+            welches das MailSender Interface durch Unterstützung
+            von MIME Nachrichten erweitert.
+            Das MailSender Interface definiert dabei eine
+            Strategie zum Versenden einfacher Mails.
+            Unterstützt sowohl JavaMail MimeMessages und
+            Spring SimpleMailMessages.
+        end note
+    }
+
+    package authenticationController <<Frame>> {
+        class AuthenticationController <<@Controller>> {
+            <<create>> AuthenticationController(AuthenticationService authenticationService)
+            ResponseEntity<List<String>> verifyLogin(String username)
+            ResponseEntity<Integer> logout(String username)
+            ResponseEntity<Integer> forgotPassword(ForgotPasswordRequest forgotPasswordRequest)
+            ResponseEntity<Integer> resetPassword(String username, RequestWithPassword requestWithPassword)
+            ResponseEntity<Integer> registerUser(UserDetails user)
+            ResponseEntity<Integer> changePassword(String username, ChangePasswordRequest changePasswordRequest)
+            ResponseEntity<Integer> deleteUser(String username, RequestWithPassword requestWithPassword)
+        }
+
+        class ChangePasswordRequest {
+            <<create>> ChangePasswordRequest(String oldPassword, String newPassword)
+            String getOldPassword()
+            String getNewPassword()
+        }
+
+        class ForgotPasswordRequest {
+            <<create>> ForgotPasswordRequest(String email)
+            String getEmail()
+        }
+
+        class RequestWithPassword {
+            <<create>> ResetPasswordRequest(String password)
+            String getPassword()
+        }
+    }
+}
+
+package model <<Frame>> {
+    class Subscription {
+        <<create>> Subscription(String url, String title)
+        int getID()
+        String getURL()
+        long getLastActionTimestamp()
+        String getTitle()
+    }
+
+    class SubscriptionAction {
+        <<create>> SubscriptionAction(int userID, int subscriptionID)
+        int getID()
+        int getUserID()
+        int getSubscriptionID()
+        long getTimestamp()
+        boolean getAdded()
+    }
+
+    class Episode {
+        <<create>> Episode(int subscriptionID, int id, String url, String title, String thumbnailURL, int total)
+        int getSubscriptionID()
+        int getID()
+        int getGUID()
+        String getURL()
+        String getTitle()
+        int getTotal()
+    }
+
+    enum Action {
+        Download
+        Play
+        Delete
+        New
+        Flattr
+        String getJsonProperty()
+    }
+
+    class EpisodeAction {
+        <<create>> EpisodeAction(Action action, LocalDateTime timestamp, int started, int position)
+        int getEpisodeID()
+        Action getAction()
+        long getTimestamp()
+        int getStarted()
+        int getPosition()
+        void setEpisodeID()
+        EpisodeActionPost getEpisodeActionPost(String podcastURL, String episodeURL)
+    }
+    
+    interface UserDetails {
+        String getUsername()
+        String getPassword()
+        Collection<Authority> getAuthorities()
+        boolean isAccountExpired()
+        boolean isAccountLocked()
+        boolean isCredentialsNonExpired()
+        boolean isEnabled()
+    }
+    note left
+        Aus org.springframework.security.core.userdetails.
+        Wird für die Schnittstelle UserDetailsManager benötigt.
+        Stellt wichtige Informationen eines Users bereit.
+        Diese werden nur indirekt von Spring Security
+        benutzt, indem sie vorher in Authentication Objekten
+        gekapselt werden.
+    end note
+
+    class User {
+        --
+        <<create>> User(String username, String password)
+        int getID()
+        String getSessionToken()
+        boolean getEmailIsValidated()
+        .. interface methods ..
+        String getUsername()
+        String getPassword()
+        Collection<Authority> getAuthorities()
+        boolean isAccountExpired()
+        boolean isAccountLocked()
+        boolean isCredentialsNonExpired()
+        boolean isEnabled()
+    }
+
+    interface GrantedAuthority {
+        String getAuthority()
+    }
+    note right
+        Aus org.springframework.security.core.
+        Wird für die Schnittstelle UserDetails benötigt.
+        Repräsentiert eine Autorisierung, die einem 
+        Authentication Objekt gewährt wird.
+    end note
+
+    class Authority {
+        <<create>> Authority()
+        String getAuthority()
+    }
+}
+
+package util <<Frame>> {
+    class RSSParser {
+        <<create>> RSSParser(String subscriptionURL)
+        String getSubscriptionTitle()
+        List<Episode> getEpisodes()
+        Episode getEpisodeForURL(String episodeURL)
+    }
+    note bottom
+        Verwendet intern Spring um 
+        HTTP-Anfragen zu erstellen.
+    end note
+
+    class CleanCronJob {
+        <<create>> CleanCronJob(JdbcUserDetailsManager jdbcUserDetailsManager)
+        void cleanInvalidUsers()
+    }
+    note bottom
+        Hintergrundservice, der in periodischen Abständen
+        Nutzer, die ihre E-Mail-Adresse nicht nach 24 Stunden
+        bestätigt haben, wieder aus der Datenbank löscht.
+        (Auf die Assoziation zu JdbcUserDetailsManager wird
+        im Sinne der Übersichtlichkeit verzichtet.)
+    end note
+
+    class ResponseEntity<T> {
+        <<create>> ResponseEntity(T body, HttpStatusCode status)
+        T getBody()
+        HttpStatusCode getStatusCode()
+    }
+    note bottom
+        Aus org.springframework.http.
+        Erweitert die Klasse HttpEntity, welche
+        ein HTTP Anfrage- oder Antwort-Objekt
+        repräsentiert, durch einen HttpStatusCode.
+        Wird von den Controller-Methoden als 
+        Rückgabewert verwendet.
+    end note
+}
+
+class SecurityConfigurationBasicAuth {
+    <<create>> SecurityConfigurationBasicAuth()
+    PasswordEncoder encoder()
+    UserDetailsManager userDetailsService()
+    SecuryFilterChain fiterChain(HTTPSecurity http) throws Excpetion
+}
+note top
+    Erstellt einen Servlet Filter (springSecurityFilterChain)
+    der für die gesamte Sicherheit zuständig ist (Schutz der URLs,
+    Validierung von Anmeldedaten, Weiterleitung zur Anmeldung, etc.).
+end note 
+
+class PSEApplication {
+    <<create>> PSEApplication()
+    void main(String[] args)
+}
+
+database Datenbank
+Datenbank <-[hidden]d- subscriptionsAPI
+Datenbank <-[hidden]d- episodeActionsAPI
+Datenbank <-[hidden]d- authenticationAPI
+() SQL as SQLSub
+() SQL as SQLAuth
+() SQL as SQLEpisode
+
+Datenbank -- SQLSub
+Datenbank -- SQLAuth
+Datenbank -- SQLEpisode
+
+SubscriptionController ..o PSEApplication 
+AuthenticationController ..o PSEApplication 
+EpisodeActionController ..o PSEApplication 
+SecurityConfigurationBasicAuth ..o PSEApplication 
+
+PSEApplication --() HTTP 
+
+SQLSub )-- SubscriptionDataAccessService: JPA
+' SQLAuth )-- AuthenticationDataAccessService: JPA
+SQLAuth )-- JdbcUserDetailsManager: JDBC
+SQLEpisode )-- EpisodeActionDataAccessService: JPA
+
+Subscription <. SubscriptionAction: ID
+' Subscription <.. SubscriptionDataAccessService: DB
+' SubscriptionAction <.. SubscriptionDataAccessService: DB
+SubscriptionService --o SubscriptionController
+SubscriptionDao <.. SubscriptionService: <<use>>
+Subscription --o SubscriptionTitles
+EpisodeActionPost -o SubscriptionTitles
+SubscriptionDao <|. SubscriptionDataAccessService: <<realize>>
+
+' User <.. AuthenticationDataAccessService: DB
+' User <.. JdbcUserDetailsManager: DB
+UserDetailsManager <.. AuthenticationService: <<use>>
+' AuthenticationDao <.. AuthenticationService: <<use>>
+AuthenticationService --o AuthenticationController
+' AuthenticationDao <|. AuthenticationDataAccessService: <<realize>>
+UserDetailsManager <|. JdbcUserDetailsManager: <<realize>>
+UserDetailsManager <.. SecurityConfigurationBasicAuth: <<use>>
+UserDetails <|.. User: <<realize>>
+User -> Authority
+GrantedAuthority <|.. Authority: <<realize>>
+JavaMailSenderImpl <. AuthenticationService: <<use>>
+
+Action <-- EpisodeAction
+EpisodeActionPost -o EpisodeActionGetResponse 
+EpisodeActionPost -o EpisodeActionPostRequest
+EpisodeAction .> Episode: ID
+' EpisodeAction <.. EpisodeActionDataAccessService: DB
+' Episode <.. EpisodeActionDataAccessService: DB
+EpisodeActionDao <.. EpisodeActionService: <<use>>
+EpisodeActionService --o EpisodeActionController
+EpisodeActionDao <|. EpisodeActionDataAccessService: <<realize>>
+
+RSSParser <. SubscriptionDataAccessService: <<use>>
+RSSParser <. EpisodeActionDataAccessService: <<use>>
+' JdbcUserDetailsManager <-- CleanCronJob
+
+model .o Datenbank: ORM (User, SubscriptionAction, Subscription, EpisodeAction, Episode)
+' Datenbank o.. Subscription: ORM
+' Datenbank o.. SubscriptionAction: ORM
+' Datenbank o.. Episode: ORM
+' Datenbank o.. EpisodeAction: ORM
+' Datenbank o.. User: ORM
+
+@enduml