New settings, reduce config saving spam

- max concurrent http requests (total and per host)
- config saving is delayed for some millis to reduce disk and log spam in case of fast repeated calls

client/src/main/java/ctbrec/ui/settings/SettingsTab.java

@@ -135,6 +135,9 @@ public class SettingsTab extends Tab implements TabSelectionListener {
     private SimpleStringProperty filterWhitelist;
     private SimpleBooleanProperty deleteOrphanedRecordingMetadata;
     private SimpleIntegerProperty restrictBitrate;
+    private SimpleIntegerProperty configSavingDelayMs;
+    private SimpleIntegerProperty httpClientMaxRequests;
+    private SimpleIntegerProperty httpClientMaxRequestsPerHost;
 
     public SettingsTab(List<Site> sites, Recorder recorder) {
         this.sites = sites;
@@ -219,6 +222,9 @@ public class SettingsTab extends Tab implements TabSelectionListener {
         filterWhitelist = new SimpleStringProperty(null, "filterWhitelist", settings.filterWhitelist);
         deleteOrphanedRecordingMetadata = new SimpleBooleanProperty(null, "deleteOrphanedRecordingMetadata", settings.deleteOrphanedRecordingMetadata);
         restrictBitrate = new SimpleIntegerProperty(null, "restrictBitrate", settings.restrictBitrate);
+        configSavingDelayMs = new SimpleIntegerProperty(null, "configSavingDelayMs", settings.configSavingDelayMs);
+        httpClientMaxRequests = new SimpleIntegerProperty(null, "httpClientMaxRequests", settings.httpClientMaxRequests);
+        httpClientMaxRequestsPerHost = new SimpleIntegerProperty(null, "httpClientMaxRequestsPerHost", settings.httpClientMaxRequestsPerHost);
     }
 
     private void createGui() {
@@ -332,7 +338,17 @@ public class SettingsTab extends Tab implements TabSelectionListener {
                                 Setting.of("Password", proxyPassword).needsRestart())),
                 Category.of("Advanced / Devtools",
                         Group.of("Networking",
-                                Setting.of("Playlist request timeout (ms)", playlistRequestTimeout, "Timeout in ms for playlist requests")),
+                                Setting.of("Playlist request timeout (ms)", playlistRequestTimeout, "Timeout in ms for playlist requests"),
+                                Setting.of("Max requests", httpClientMaxRequests, 
+                                                "The maximum number of requests to execute concurrently. Above this requests queue in memory,\n" + //
+                                                "waiting for the running calls to complete.\n\n" + //
+                                                "If more than [maxRequests] requests are in flight when this is invoked, those requests will remain in flight."),
+                                Setting.of("Max requests per host", httpClientMaxRequestsPerHost, 
+                                                "The maximum number of requests for each host to execute concurrently. This limits requests by\n" + //
+                                                "the URL's host name. Note that concurrent requests to a single IP address may still exceed this\n" + //
+                                                "limit: multiple hostnames may share an IP address or be routed through the same HTTP proxy.\n\n" + //
+                                                "If more than [maxRequestsPerHost] requests are in flight when this is invoked, those requests will remain in flight.\n\n" + //
+                                                "WebSocket connections to hosts **do not** count against this limit.")),
                         Group.of("Logging",
                                 Setting.of("Log FFmpeg output", logFFmpegOutput, "Log FFmpeg output to files in the system's temp directory"),
                                 Setting.of("Log missed segments", logMissedSegments,
@@ -341,7 +357,10 @@ public class SettingsTab extends Tab implements TabSelectionListener {
                                 Setting.of("Use hlsdl (if possible)", useHlsdl,
                                         "Use hlsdl to record the live streams. Some features might not work correctly."),
                                 Setting.of("hlsdl executable", hlsdlExecutable, "Path to the hlsdl executable"),
-                                Setting.of("Log hlsdl output", loghlsdlOutput, "Log hlsdl output to files in the system's temp directory"))));
+                                Setting.of("Log hlsdl output", loghlsdlOutput, "Log hlsdl output to files in the system's temp directory")),
+                        Group.of("Miscelaneous",
+                                Setting.of("Config file saving delay (ms)", configSavingDelayMs, 
+                                        "Wait specified number of milliseconds before actually writing config to disk"))));
         Region preferencesView = prefs.getView();
         prefs.onRestartRequired(this::showRestartRequired);
         storage.setPreferences(prefs);

common/src/main/java/ctbrec/Settings.java

@@ -143,6 +143,8 @@ public class Settings {
     @Deprecated
     public String postProcessing = "";
     public int playlistRequestTimeout = 2000;
+    public int httpClientMaxRequests = 64;
+    public int httpClientMaxRequestsPerHost = 16;
     public int postProcessingThreads = 2;
     public List<PostProcessorDto> postProcessors = new ArrayList<>();
     public String proxyHost;
@@ -228,4 +230,5 @@ public class Settings {
     public String filterWhitelist = "";
     public boolean checkResolutionByMinSide = false;
     public int restrictBitrate = 0;
+    public int configSavingDelayMs = 400;
 }

common/src/main/java/ctbrec/io/HttpClient.java

@@ -20,6 +20,7 @@ import java.io.File;
 import java.io.IOException;
 import java.net.Authenticator;
 import java.net.PasswordAuthentication;
+import java.net.SocketTimeoutException;
 import java.nio.file.Files;
 import java.security.KeyManagementException;
 import java.security.NoSuchAlgorithmException;
@@ -171,6 +172,8 @@ public abstract class HttpClient {
         }
 
         client = builder.build();
+        client.dispatcher().setMaxRequests(config.getSettings().httpClientMaxRequests);
+        client.dispatcher().setMaxRequestsPerHost(config.getSettings().httpClientMaxRequestsPerHost);
     }
 
     /**

common/src/main/java/ctbrec/recorder/SimplifiedLocalRecorder.java

@@ -580,7 +580,7 @@ public class SimplifiedLocalRecorder implements Recorder {
                 }
             }
         };
-        saveConfigTimer.schedule(saveConfigTask, 400);
+        saveConfigTimer.schedule(saveConfigTask, config.getSettings().configSavingDelayMs);
     }
 
     @Override