Rework beacon connection and implement various improvements

api/src/test/java/io/xpipe/api/test/ConnectionFactory.java

@@ -6,7 +6,14 @@ import io.xpipe.beacon.BeaconServer;
 
 public class ConnectionFactory {
 
+    private static boolean alreadyStarted;
+
     public static void start() throws Exception {
+        if (BeaconServer.isRunning()) {
+            alreadyStarted = true;
+            return;
+        }
+
         if (!BeaconServer.tryStart()) {
             throw new AssertionError();
         }
@@ -18,6 +25,10 @@ public class ConnectionFactory {
     }
 
     public static void stop() throws Exception {
+        if (alreadyStarted) {
+            return;
+        }
+
         if (!BeaconServer.isRunning()) {
             return;
         }

api/src/test/java/io/xpipe/api/test/DaemonControl.java

@@ -6,12 +6,12 @@ import org.junit.jupiter.api.BeforeAll;
 public class DaemonControl {
 
     @BeforeAll
-    static void setup() throws Exception {
+    public static void setup() throws Exception {
         ConnectionFactory.start();
     }
 
     @AfterAll
-    static void teardown() throws Exception {
+    public static void teardown() throws Exception {
         ConnectionFactory.stop();
     }
 }

api/src/test/java/io/xpipe/api/test/DataTableAccumulatorTest.java

@@ -0,0 +1,33 @@
+package io.xpipe.api.test;
+
+import io.xpipe.api.DataTableAccumulator;
+import io.xpipe.core.data.node.TupleNode;
+import io.xpipe.core.data.node.ValueNode;
+import io.xpipe.core.data.type.TupleType;
+import io.xpipe.core.data.type.ValueType;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.OptionalInt;
+
+public class DataTableAccumulatorTest extends DaemonControl {
+
+    @Test
+    public void test() {
+        var type = TupleType.of(
+                List.of("col1", "col2"),
+                List.of(ValueType.of(), ValueType.of()));
+        var acc = DataTableAccumulator.create(type);
+
+        var val = type.convert(
+                TupleNode.of(List.of(ValueNode.of("val1"), ValueNode.of("val2")))).orElseThrow();
+        acc.add(val);
+        var table = acc.finish(":test");
+
+        Assertions.assertEquals(table.getInfo().getDataType(), TupleType.tableType(List.of("col1", "col2")));
+        Assertions.assertEquals(table.getInfo().getRowCountIfPresent(), OptionalInt.empty());
+        var read = table.read(1).at(0);
+        Assertions.assertEquals(val, read);
+    }
+}

api/src/test/java/io/xpipe/api/test/DataTableTest.java

@@ -10,7 +10,7 @@ import java.util.Map;
 public class DataTableTest extends DaemonControl {
 
     @BeforeAll
-    static void setup() throws Exception {
+    public static void setupStorage() throws Exception {
         DataSource.create(DataSourceId.fromString(":usernames"), "csv", Map.of(), DataTableTest.class.getResource("username.csv"));
     }