Re #23: Static labels are serialized into string at startup. If there are no other labels to add to the stream then we will just use that string.

tjahzi-core/src/main/java/pl/tkowalcz/tjahzi/LogBufferAgent.java

@@ -25,11 +25,9 @@ public class LogBufferAgent implements Agent, MessageHandler {
     private final long batchSize;
     private final long batchWaitMillis;
 
-    private final Map<String, String> staticLabels;
-    private final LogBufferDeserializer logBufferDeserializer = new LogBufferDeserializer();
+    private final LogBufferDeserializer logBufferDeserializer;
 
     private Logproto.PushRequest.Builder request = Logproto.PushRequest.newBuilder();
-
     private int estimatedBytesPending;
     private long timeoutDeadline;
 
@@ -48,7 +46,7 @@ public class LogBufferAgent implements Agent, MessageHandler {
         this.batchWaitMillis = batchWaitMillis;
         this.httpClient = httpClient;
 
-        this.staticLabels = staticLabels;
+        this.logBufferDeserializer = new LogBufferDeserializer(staticLabels);
     }
 
     @Override
@@ -103,8 +101,7 @@ public class LogBufferAgent implements Agent, MessageHandler {
     private void processMessage(MutableDirectBuffer buffer, int index) {
         Logproto.StreamAdapter stream = logBufferDeserializer.deserializeIntoProtobuf(
                 buffer,
-                index,
-                staticLabels
+                index
         );
 
         request.addStreams(stream);

tjahzi-core/src/main/java/pl/tkowalcz/tjahzi/LogBufferDeserializer.java

@@ -1,6 +1,7 @@
 package pl.tkowalcz.tjahzi;
 
 import com.google.protobuf.Timestamp;
+import io.netty.util.internal.StringUtil;
 import javolution.text.TextBuilder;
 import logproto.Logproto;
 import org.agrona.DirectBuffer;
@@ -11,11 +12,19 @@ import java.util.Map;
 
 public class LogBufferDeserializer {
 
-    public Logproto.StreamAdapter deserializeIntoProtobuf(
-            DirectBuffer buffer,
-            int index,
-            Map<String, String> staticLabels
-    ) {
+    private final Map<String, String> staticLabels;
+    private final String staticLabelsString;
+
+    public LogBufferDeserializer(Map<String, String> staticLabels) {
+        this.staticLabels = staticLabels;
+        this.staticLabelsString = buildLabelsStringIncludingStatic(
+                Map.of(),
+                StringUtil.EMPTY_STRING,
+                staticLabels
+        );
+    }
+
+    public Logproto.StreamAdapter deserializeIntoProtobuf(DirectBuffer buffer, int index) {
         long timestamp = buffer.getLong(index);
         index += Long.BYTES;
 
@@ -29,7 +38,6 @@ public class LogBufferDeserializer {
         String line = buffer.getStringAscii(index);
 
         return createGrpcStream(
-                staticLabels,
                 timestamp,
                 labels,
                 line
@@ -58,7 +66,6 @@ public class LogBufferDeserializer {
     }
 
     private Logproto.StreamAdapter createGrpcStream(
-            Map<String, String> staticLabels,
             long timestamp,
             Map<String, String> labels,
             String line
@@ -68,7 +75,11 @@ public class LogBufferDeserializer {
 
         return Logproto.StreamAdapter.newBuilder()
                 .setLabels(
-                        buildLabelsStringIncludingStatic(staticLabels, labels)
+                        buildLabelsStringIncludingStatic(
+                                staticLabels,
+                                staticLabelsString,
+                                labels
+                        )
                 )
                 .addEntries(
                         Logproto.EntryAdapter.newBuilder()
@@ -84,7 +95,13 @@ public class LogBufferDeserializer {
 
     private static String buildLabelsStringIncludingStatic(
             Map<String, String> staticLabels,
-            Map<String, String> labels) {
+            String staticLabelsString,
+            Map<String, String> labels
+    ) {
+        if (labels.isEmpty()) {
+            return staticLabelsString;
+        }
+
         TextBuilder textBuilder = TextBuilders.threadLocal();
 
         textBuilder.append("{ ");

tjahzi-core/src/test/java/pl/tkowalcz/tjahzi/LogBufferAgentTest.java

@@ -23,7 +23,7 @@ class LogBufferAgentTest {
     private SettableClock clock;
 
     @BeforeEach
-    private void setUp() {
+    void setUp() {
         logBuffer = new ManyToOneRingBuffer(
                 new UnsafeBuffer(new byte[1024 * 1024 + RingBufferDescriptor.TRAILER_LENGTH])
         );

tjahzi-core/src/test/java/pl/tkowalcz/tjahzi/LogBufferDeserializerTest.java

@@ -19,6 +19,7 @@ import static pl.tkowalcz.tjahzi.LogBufferSerializerDeserializerTest.toPropertyS
 
 class LogBufferDeserializerTest {
 
+    @SuppressWarnings("unused")
     @ParameterizedTest(name = "{0}")
     @MethodSource("pl.tkowalcz.tjahzi.LogBufferSerializerDeserializerTest#variousMessageConfigurations")
     void shouldDeserializeMessageAndAddStaticLabels(
@@ -45,11 +46,10 @@ class LogBufferDeserializerTest {
         staticLabels.put("bazz", "buzz");
 
         // When
-        LogBufferDeserializer deserializer = new LogBufferDeserializer();
+        LogBufferDeserializer deserializer = new LogBufferDeserializer(staticLabels);
         Logproto.StreamAdapter stream = deserializer.deserializeIntoProtobuf(
                 buffer,
-                0,
-                staticLabels
+                0
         );
 
         // Then
@@ -100,11 +100,10 @@ class LogBufferDeserializerTest {
         );
 
         // When
-        LogBufferDeserializer deserializer = new LogBufferDeserializer();
+        LogBufferDeserializer deserializer = new LogBufferDeserializer(staticLabels);
         Logproto.StreamAdapter stream = deserializer.deserializeIntoProtobuf(
                 buffer,
-                0,
-                staticLabels
+                0
         );
 
         // Then

tjahzi-core/src/test/java/pl/tkowalcz/tjahzi/LogBufferSerializerDeserializerTest.java

@@ -89,8 +89,8 @@ class LogBufferSerializerDeserializerTest {
         );
 
         // Then
-        LogBufferDeserializer deserializer = new LogBufferDeserializer();
-        Logproto.StreamAdapter stream = deserializer.deserializeIntoProtobuf(buffer, 0, Map.of());
+        LogBufferDeserializer deserializer = new LogBufferDeserializer(Map.of());
+        Logproto.StreamAdapter stream = deserializer.deserializeIntoProtobuf(buffer, 0);
 
         assertThat(stream.getEntriesList()).hasSize(1);
         assertThat(stream.getEntriesList().get(0).getTimestamp()).isEqualTo(