Add textual flag to value node, prepare for text data sources, and various other small fixes

beacon/src/main/java/io/xpipe/beacon/BeaconClient.java

@@ -138,6 +138,11 @@ public class BeaconClient implements AutoCloseable {
             System.out.println("Sending request to server of type " + req.getClass().getName());
         }
 
+        if (BeaconConfig.debugEnabled()) {
+            System.out.println("Sending raw request:");
+            System.out.println(msg.toPrettyString());
+        }
+
         try {
             var mapper = JacksonHelper.newMapper().disable(JsonGenerator.Feature.AUTO_CLOSE_TARGET);
             var gen = mapper.createGenerator(socket.getOutputStream());

beacon/src/main/java/io/xpipe/beacon/exchange/ReadPreparationExchange.java

@@ -43,7 +43,8 @@ public class ReadPreparationExchange implements MessageExchange<ReadPreparationE
     @Builder
     @Value
     public static class Response implements ResponseMessage {
+        String determinedType;
+
         DataSourceConfigInstance config;
-        StreamDataStore store;
     }
 }

beacon/src/main/java/io/xpipe/beacon/exchange/api/QueryTableDataExchange.java

@@ -3,7 +3,7 @@ package io.xpipe.beacon.exchange.api;
 import io.xpipe.beacon.exchange.MessageExchange;
 import io.xpipe.beacon.message.RequestMessage;
 import io.xpipe.beacon.message.ResponseMessage;
-import io.xpipe.core.source.DataSourceId;
+import io.xpipe.core.source.DataSourceReference;
 import lombok.Builder;
 import lombok.NonNull;
 import lombok.Value;
@@ -34,7 +34,7 @@ public class QueryTableDataExchange implements MessageExchange<QueryTableDataExc
     @Value
     public static class Request implements RequestMessage {
         @NonNull
-        DataSourceId id;
+        DataSourceReference ref;
 
         int maxRows;
     }

beacon/src/main/java/io/xpipe/beacon/exchange/api/QueryTextDataExchange.java

@@ -0,0 +1,44 @@
+package io.xpipe.beacon.exchange.api;
+
+import io.xpipe.beacon.exchange.MessageExchange;
+import io.xpipe.beacon.message.RequestMessage;
+import io.xpipe.beacon.message.ResponseMessage;
+import io.xpipe.core.source.DataSourceReference;
+import lombok.Builder;
+import lombok.NonNull;
+import lombok.Value;
+import lombok.extern.jackson.Jacksonized;
+
+public class QueryTextDataExchange implements MessageExchange<QueryTextDataExchange.Request, QueryTextDataExchange.Response> {
+
+    @Override
+    public String getId() {
+        return "queryTextData";
+    }
+
+    @Override
+    public Class<QueryTextDataExchange.Request> getRequestClass() {
+        return QueryTextDataExchange.Request.class;
+    }
+
+    @Override
+    public Class<QueryTextDataExchange.Response> getResponseClass() {
+        return QueryTextDataExchange.Response.class;
+    }
+
+    @Jacksonized
+    @Builder
+    @Value
+    public static class Request implements RequestMessage {
+        @NonNull
+        DataSourceReference ref;
+
+        int maxLines;
+    }
+
+    @Jacksonized
+    @Builder
+    @Value
+    public static class Response implements ResponseMessage {
+    }
+}