Add start of reloading client settings

Added new client settings paramter 'settingsReloadDelayInMinutes'
to handle how often the client settings are updated.
Added scheduler to call a new 'reloadClientSettings' method when
it's time to reload client settings.

src/main/kotlin/mdnet/base/MangaDexClient.kt

@@ -51,7 +51,7 @@ object Shutdown : State()
 // server is in the process of shutting down
 data class GracefulShutdown(val lastRunning: Running, val counts: Int = 0, val nextState: State = Uninitialized, val action: () -> Unit = {}) : State()
 // server is currently running
-data class Running(val server: Http4kServer, val settings: ServerSettings) : State()
+data class Running(val server: Http4kServer, val settings: ServerSettings, val minutesToSettingsReload: Int) : State()
 
 class MangaDexClient(private val clientSettings: ClientSettings) {
     // this must remain singlethreaded because of how the state mechanism works
@@ -195,6 +195,26 @@ class MangaDexClient(private val clientSettings: ClientSettings) {
                 LOGGER.warn(e) { "Graceful shutdown checker failed" }
             }
         }, 45, 45, TimeUnit.SECONDS)
+
+        // Check every minute to see if we need to reload the client settings
+        executorService.scheduleWithFixedDelay({
+            try {
+                val state = this.state
+                if (state is Running) {
+                    val minutesToNextReload = state.minutesToSettingsReload
+                    if (minutesToNextReload <= 0) {
+                        reloadClientSettings()
+                        this.state = state.copy(minutesToSettingsReload = clientSettings.settingsReloadDelayInMinutes)
+                    }
+                    else {
+                        this.state = state.copy(minutesToSettingsReload = minutesToNextReload - 1)
+                    }
+                    LOGGER.info { "Time to next client settings reload: " + minutesToNextReload }
+                }
+            } catch (e: Exception) {
+                LOGGER.warn(e) { "Client settings reloader failed" }
+            }
+        }, 1, 1, TimeUnit.MINUTES)
     }
 
     private fun pingControl() {
@@ -235,7 +255,7 @@ class MangaDexClient(private val clientSettings: ClientSettings) {
             }
         }
 
-        state = Running(server, serverSettings)
+        state = Running(server, serverSettings, clientSettings.settingsReloadDelayInMinutes)
         LOGGER.info { "Internal HTTP server was successfully started" }
     }
 
@@ -296,6 +316,15 @@ class MangaDexClient(private val clientSettings: ClientSettings) {
         (LoggerFactory.getILoggerFactory() as LoggerContext).stop()
     }
 
+    /**
+     * Reloads the client configuration and restarts the
+     * Web UI and/or the server if needed
+     */
+    private fun reloadClientSettings() {
+        val state = this.state
+        LOGGER.info { "Reloading client settings" }
+    }
+
     companion object {
         private val LOGGER = LoggerFactory.getLogger(MangaDexClient::class.java)
         private val JACKSON: ObjectMapper = jacksonObjectMapper()

src/main/kotlin/mdnet/base/settings/ClientSettings.kt

@@ -34,6 +34,7 @@ data class ClientSettings(
     @field:Secret val clientSecret: String = "PASTE-YOUR-SECRET-HERE",
     val threads: Int = 4,
     val gracefulShutdownWaitSeconds: Int = 60,
+    val settingsReloadDelayInMinutes: Int = 60, // Once per hour
     val webSettings: WebSettings? = null,
     val devSettings: DevSettings? = null
 )