Add thread name and id to each span as additional tags.

dd-trace/pom.xml

@@ -14,10 +14,6 @@
     <description>Datadog core library</description>
     <url>https://github.com/datadog/dd-trace-java</url>
 
-    <properties>
-        <java.version>1.6</java.version>
-    </properties>
-
     <dependencies>
 
         <!-- Opentracing core -->

dd-trace/src/main/java/com/datadoghq/trace/DDSpanContext.java

@@ -3,6 +3,7 @@ package com.datadoghq.trace;
 
 import com.datadoghq.trace.integration.DDSpanContextDecorator;
 import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.google.common.collect.Maps;
 import io.opentracing.tag.Tags;
 
 import java.util.*;
@@ -21,6 +22,8 @@ public class DDSpanContext implements io.opentracing.SpanContext {
 	private final long traceId;
 	private final long spanId;
 	private final long parentId;
+	private final String threadName = Thread.currentThread().getName();
+	private final long threadId = Thread.currentThread().getId();
 	private Map<String, String> baggageItems;
 
 	// DD attributes
@@ -126,7 +129,7 @@ public class DDSpanContext implements io.opentracing.SpanContext {
 	public boolean getErrorFlag() {
 		return errorFlag;
 	}
-	
+
 	public void setErrorFlag(boolean errorFlag) {
 		this.errorFlag = errorFlag;
 	}
@@ -193,6 +196,11 @@ public class DDSpanContext implements io.opentracing.SpanContext {
 	}
 
 	public synchronized Map<String, Object> getTags() {
+		if(tags.isEmpty()) {
+			tags = Maps.newHashMapWithExpectedSize(2);
+		}
+		tags.put(DDTags.THREAD_NAME, threadName);
+		tags.put(DDTags.THREAD_ID, threadId);
 		return Collections.unmodifiableMap(tags);
 	}
 

dd-trace/src/main/java/com/datadoghq/trace/DDTags.java

@@ -4,4 +4,6 @@ public class DDTags {
 	public static final String SPAN_TYPE = "span-type";
 	public static final String SERVICE_NAME = "service-name";
 	public static final String RESOURCE_NAME = "resource-name";
+	public static final String THREAD_NAME = "thread-name";
+	public static final String THREAD_ID = "thread-id";
 }

dd-trace/src/test/java/com/datadoghq/trace/DDSpanBuilderTest.java

@@ -66,7 +66,7 @@ public class DDSpanBuilderTest {
 				.start();
 
 		assertThat(span.getTags()).isNotNull();
-		assertThat(span.getTags()).isEmpty();
+		assertThat(span.getTags().size()).isEqualTo(2);
 
 		// with all custom fields provided
 		final String expectedResource = "fakeResource";
@@ -88,7 +88,8 @@ public class DDSpanBuilderTest {
 		assertThat(actualContext.getErrorFlag()).isTrue();
 		assertThat(actualContext.getServiceName()).isEqualTo(expectedService);
 		assertThat(actualContext.getSpanType()).isEqualTo(expectedType);
-
+		assertThat(actualContext.getTags().get(DDTags.THREAD_NAME)).isEqualTo(Thread.currentThread().getName());
+		assertThat(actualContext.getTags().get(DDTags.THREAD_ID)).isEqualTo(Thread.currentThread().getId());
 
 	}
 

dd-trace/src/test/java/com/datadoghq/trace/DDSpanSerializationTest.java

@@ -5,6 +5,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 import java.util.HashMap;
 import java.util.Map;
 
+import com.google.common.collect.Maps;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -16,15 +17,28 @@ public class DDSpanSerializationTest {
     ObjectMapper serializer;
     DDSpan span;
     DDActiveSpan activeSpan;
+    Map<String,Object> expected = Maps.newHashMap();
 
     @Before
     public void setUp() throws Exception {
 
-        Map<String, String> baggage = new HashMap<String, String>();
+        Map<String, String> baggage = new HashMap<>();
         baggage.put("a-baggage", "value");
-        Map<String, Object> tags = new HashMap<String, Object>();
+        Map<String, Object> tags = new HashMap<>();
         baggage.put("k1", "v1");
 
+        expected.put("meta", baggage);
+        expected.put("service", "service");
+        expected.put("error", 0);
+        expected.put("type", "type");
+        expected.put("name", "operation");
+        expected.put("duration", 33000);
+        expected.put("resource", "operation");
+        expected.put("start", 100000);
+        expected.put("span_id", 2l);
+        expected.put("parent_id", 0l);
+        expected.put("trace_id", 1l);
+
 
         DDSpanContext context = new DDSpanContext(
                 1L,
@@ -33,13 +47,16 @@ public class DDSpanSerializationTest {
                 "service",
                 "operation",
                 null,
-                baggage,
+                new HashMap<String, String>(baggage),
                 false,
                 "type",
                 tags,
                 null,
                 null);
 
+        baggage.put("thread-name", Thread.currentThread().getName());
+        baggage.put("thread-id", String.valueOf(Thread.currentThread().getId()));
+
         span = new DDSpan(
                 100L,
                 context);
@@ -52,22 +69,7 @@ public class DDSpanSerializationTest {
 
     @Test
     public void test() throws Exception {
-
-
-        String expected = "{\"meta\":{\"a-baggage\":\"value\",\"k1\":\"v1\"},\"service\":\"service\",\"error\":0,\"type\":\"type\",\"name\":\"operation\",\"duration\":33000,\"resource\":\"operation\",\"start\":100000,\"span_id\":2,\"parent_id\":0,\"trace_id\":1}";
-        // FIXME At the moment, just compare the string sizes
-        try {
-            assertThat(serializer.writeValueAsString(span).length()).isEqualTo(expected.length());
-            
-        } catch (AssertionError e) {
-            assertThat(serializer.writeValueAsString(span)).isEqualTo(expected);
-        }
-        
-//        try {
-//            assertThat(serializer.writeValueAsString(activeSpan).length()).isEqualTo(expected.length());
-//        } catch (AssertionError e) {
-//            assertThat(serializer.writeValueAsString(activeSpan)).isEqualTo(expected);
-//        }
+        assertThat(serializer.readTree(serializer.writeValueAsString(span)))
+                .isEqualTo(serializer.readTree(serializer.writeValueAsString(expected)));
     }
-
 }