Remove setter of SpanContext, because it should be immutable

scm-core/src/main/java/sonia/scm/trace/SpanContext.java

@@ -26,9 +26,9 @@ package sonia.scm.trace;
 
 import lombok.AccessLevel;
 import lombok.AllArgsConstructor;
+import lombok.EqualsAndHashCode;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
-import lombok.Setter;
 import sonia.scm.xml.XmlInstantAdapter;
 
 import javax.xml.bind.annotation.XmlAccessType;
@@ -44,21 +44,30 @@ import java.util.Map;
  *
  * @since 2.9.0
  */
+@Getter
 @XmlRootElement
+@EqualsAndHashCode
+@AllArgsConstructor
 @XmlAccessorType(XmlAccessType.FIELD)
 @NoArgsConstructor(access = AccessLevel.PACKAGE)
-@AllArgsConstructor(access = AccessLevel.PACKAGE)
-@Getter
-@Setter
 public class SpanContext {
 
-  String kind;
-  Map<String, String> labels;
+  private String kind;
+  private Map<String, String> labels;
   @XmlJavaTypeAdapter(XmlInstantAdapter.class)
-  Instant opened;
+  private Instant opened;
   @XmlJavaTypeAdapter(XmlInstantAdapter.class)
-  Instant closed;
-  boolean failed;
+  private Instant closed;
+  private boolean failed;
+
+  /**
+   * Returns the label with the given key or {@code null}.
+   * @param key key of label
+   * @return label or {@code null}
+   */
+  public String label(String key) {
+    return labels.get(key);
+  }
 
   /**
    * Calculates the duration of the span.
@@ -68,10 +77,4 @@ public class SpanContext {
   public Duration duration() {
     return Duration.between(opened, closed);
   }
-
-  // For testing
-  public static SpanContext create(String kind, Map<String, String> labels, Instant opened, Instant closed, boolean failed) {
-    return new SpanContext(kind, labels, opened, closed, failed);
-  }
-
 }

scm-core/src/test/java/sonia/scm/trace/SpanContextTest.java

@@ -0,0 +1,57 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package sonia.scm.trace;
+
+import com.google.common.collect.ImmutableMap;
+import org.junit.jupiter.api.Test;
+
+import javax.xml.bind.JAXB;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.time.Instant;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class SpanContextTest {
+
+  @Test
+  void shouldMarshalAndUnmarshal() {
+    Instant now = Instant.now();
+    SpanContext span = new SpanContext(
+      "jenkins", ImmutableMap.of("one", "1"), now, now, true
+    );
+
+    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+    JAXB.marshal(span, baos);
+    span = JAXB.unmarshal(new ByteArrayInputStream(baos.toByteArray()), SpanContext.class);
+
+    assertThat(span.getKind()).isEqualTo("jenkins");
+    assertThat(span.label("one")).isEqualTo("1");
+    assertThat(span.getOpened()).isEqualTo(now);
+    assertThat(span.getClosed()).isEqualTo(now);
+    assertThat(span.isFailed()).isTrue();
+  }
+
+}