Add the DefaultLogHandler implementation

dd-trace-ot/src/main/java/datadog/opentracing/DDSpan.java

@@ -51,7 +51,7 @@ public class DDSpan implements Span, MutableSpan {
   private final AtomicLong durationNano = new AtomicLong();
 
   /** Delegates to for handling the logs if present. */
-  private final LogsHandler logsHandler;
+  private final LogHandler logHandler;
 
   /** Implementation detail. Stores the weak reference to this span. Used by TraceCollection. */
   volatile WeakReference<DDSpan> ref;
@@ -63,7 +63,7 @@ public class DDSpan implements Span, MutableSpan {
    * @param context the context used for the span
    */
   DDSpan(final long timestampMicro, final DDSpanContext context) {
-    this(timestampMicro, context, null);
+    this(timestampMicro, context, new DefaultLogHandler());
   }
 
   /**
@@ -71,11 +71,11 @@ public class DDSpan implements Span, MutableSpan {
    *
    * @param timestampMicro if greater than zero, use this time instead of the current time
    * @param context the context used for the span
-   * @param logsHandler as the handler where to delegate the log actions
+   * @param logHandler as the handler where to delegate the log actions
    */
-  DDSpan(final long timestampMicro, final DDSpanContext context, final LogsHandler logsHandler) {
+  DDSpan(final long timestampMicro, final DDSpanContext context, final LogHandler logHandler) {
     this.context = context;
-    this.logsHandler = logsHandler;
+    this.logHandler = logHandler;
 
     if (timestampMicro <= 0L) {
       // record the start time
@@ -242,11 +242,8 @@ public class DDSpan implements Span, MutableSpan {
    */
   @Override
   public final DDSpan log(final Map<String, ?> map) {
-    if (!extractError(map) && logsHandler != null) {
+    extractError(map);
-      logsHandler.log(map);
+    logHandler.log(map);
-    } else {
-      log.debug("`log` method is not implemented. Doing nothing");
-    }
     return this;
   }
 
@@ -255,11 +252,8 @@ public class DDSpan implements Span, MutableSpan {
    */
   @Override
   public final DDSpan log(final long l, final Map<String, ?> map) {
-    if (!extractError(map) && logsHandler != null) {
+    extractError(map);
-      logsHandler.log(l, map);
+    logHandler.log(l, map);
-    } else {
-      log.debug("`log` method is not implemented. Doing nothing");
-    }
     return this;
   }
 
@@ -268,11 +262,7 @@ public class DDSpan implements Span, MutableSpan {
    */
   @Override
   public final DDSpan log(final String s) {
-    if (logsHandler != null) {
+    logHandler.log(s);
-      logsHandler.log(s);
-    } else {
-      log.debug("`log` method is not implemented. Provided log: {}", s);
-    }
     return this;
   }
 
@@ -281,11 +271,7 @@ public class DDSpan implements Span, MutableSpan {
    */
   @Override
   public final DDSpan log(final long l, final String s) {
-    if (logsHandler != null) {
+    logHandler.log(l, s);
-      logsHandler.log(l, s);
-    } else {
-      log.debug("`log` method is not implemented. Provided log: {}", s);
-    }
     return this;
   }
 

dd-trace-ot/src/main/java/datadog/opentracing/DDTracer.java

@@ -580,7 +580,7 @@ public class DDTracer implements io.opentracing.Tracer, Closeable, datadog.trace
     private boolean errorFlag;
     private String spanType;
     private boolean ignoreScope = false;
-    private LogsHandler logsHandler = null;
+    private LogHandler logHandler = new DefaultLogHandler();
 
     public DDSpanBuilder(final String operationName, final ScopeManager scopeManager) {
       this.operationName = operationName;
@@ -594,7 +594,7 @@ public class DDTracer implements io.opentracing.Tracer, Closeable, datadog.trace
     }
 
     private Span startSpan() {
-      return new DDSpan(timestampMicro, buildSpanContext(), logsHandler);
+      return new DDSpan(timestampMicro, buildSpanContext(), logHandler);
     }
 
     @Override
@@ -671,8 +671,9 @@ public class DDTracer implements io.opentracing.Tracer, Closeable, datadog.trace
       return parent.baggageItems();
     }
 
-    public DDSpanBuilder withLogsHandler(LogsHandler logsHandler) {
+    public DDSpanBuilder withLogHandler(final LogHandler logHandler) {
-      this.logsHandler = logsHandler;
+      assert logHandler != null : "LogHandler must not be null";
+      this.logHandler = logHandler;
       return this;
     }
 

dd-trace-ot/src/main/java/datadog/opentracing/DefaultLogHandler.java

@@ -0,0 +1,28 @@
+package datadog.opentracing;
+
+import java.util.Map;
+import lombok.extern.slf4j.Slf4j;
+
+/** The default implementation of the LogHandler. */
+@Slf4j
+public class DefaultLogHandler implements LogHandler {
+  @Override
+  public void log(Map<String, ?> fields) {
+    log.debug("`log` method is not implemented. Doing nothing");
+  }
+
+  @Override
+  public void log(long timestampMicroseconds, Map<String, ?> fields) {
+    log.debug("`log` method is not implemented. Doing nothing");
+  }
+
+  @Override
+  public void log(String event) {
+    log.debug("`log` method is not implemented. Provided log: {}", event);
+  }
+
+  @Override
+  public void log(long timestampMicroseconds, String event) {
+    log.debug("`log` method is not implemented. Provided log: {}", event);
+  }
+}

dd-trace-ot/src/main/java/datadog/opentracing/LogHandler.java

@@ -2,7 +2,7 @@ package datadog.opentracing;
 
 import java.util.Map;
 
-public interface LogsHandler {
+public interface LogHandler {
 
   /**
    * Handles the log implementation in the Span.

dd-trace-ot/src/test/groovy/datadog/opentracing/DDSpanBuilderTest.groovy

@@ -480,7 +480,7 @@ class DDSpanBuilderTest extends DDSpecification {
     "a:1,b-c:d"   | [a: "1", "b-c": "d"]
   }
 
-  def "sanity test for logs if logsHandler is null"() {
+  def "sanity test for logs if logHandler is null"() {
     setup:
     final String expectedName = "fakeName"
 
@@ -502,13 +502,13 @@ class DDSpanBuilderTest extends DDSpecification {
 
   def "should delegate simple logs to logHandler"() {
     setup:
-    final LogsHandler logsHandler = new TestLogsHandler()
+    final LogHandler logHandler = new TestLogHandler()
     final String expectedName = "fakeName"
 
     final DDSpan span =
       tracer
         .buildSpan(expectedName)
-        .withLogsHandler(logsHandler)
+        .withLogHandler(logHandler)
         .withServiceName("foo")
         .start()
     final String expectedLogEvent = "fakeEvent"
@@ -516,56 +516,56 @@ class DDSpanBuilderTest extends DDSpecification {
     span.log(timeStamp, expectedLogEvent)
 
     expect:
-    logsHandler.assertLogCalledWithArgs(timeStamp, expectedLogEvent)
+    logHandler.assertLogCalledWithArgs(timeStamp, expectedLogEvent)
   }
 
   def "should delegate simple logs with timestamp to logHandler"() {
     setup:
-    final LogsHandler logsHandler = new TestLogsHandler()
+    final LogHandler logHandler = new TestLogHandler()
     final String expectedName = "fakeName"
 
     final DDSpan span =
       tracer
         .buildSpan(expectedName)
-        .withLogsHandler(logsHandler)
+        .withLogHandler(logHandler)
         .withServiceName("foo")
         .start()
     final String expectedLogEvent = "fakeEvent"
     span.log(expectedLogEvent)
 
     expect:
-    logsHandler.assertLogCalledWithArgs(expectedLogEvent)
+    logHandler.assertLogCalledWithArgs(expectedLogEvent)
 
   }
 
   def "should delegate logs with fields to logHandler"() {
     setup:
-    final LogsHandler logsHandler = new TestLogsHandler()
+    final LogHandler logHandler = new TestLogHandler()
     final String expectedName = "fakeName"
 
     final DDSpan span =
       tracer
         .buildSpan(expectedName)
-        .withLogsHandler(logsHandler)
+        .withLogHandler(logHandler)
         .withServiceName("foo")
         .start()
     final Map<String, String> fieldsMap = new HashMap<>()
     span.log(fieldsMap)
 
     expect:
-    logsHandler.assertLogCalledWithArgs(fieldsMap)
+    logHandler.assertLogCalledWithArgs(fieldsMap)
 
   }
 
   def "should delegate logs with fields and timestamp to logHandler"() {
     setup:
-    final LogsHandler logsHandler = new TestLogsHandler()
+    final LogHandler logHandler = new TestLogHandler()
     final String expectedName = "fakeName"
 
     final DDSpan span =
       tracer
         .buildSpan(expectedName)
-        .withLogsHandler(logsHandler)
+        .withLogHandler(logHandler)
         .withServiceName("foo")
         .start()
     final Map<String, String> fieldsMap = new HashMap<>()
@@ -573,11 +573,24 @@ class DDSpanBuilderTest extends DDSpecification {
     span.log(timeStamp, fieldsMap)
 
     expect:
-    logsHandler.assertLogCalledWithArgs(timeStamp, fieldsMap)
+    logHandler.assertLogCalledWithArgs(timeStamp, fieldsMap)
 
   }
 
-  private static class TestLogsHandler implements LogsHandler {
+  def "test assertion not null LogHandler"() {
+    setup:
+    final String expectedName = "fakeName"
+
+    when:
+      tracer
+        .buildSpan(expectedName)
+        .withLogHandler(null)
+
+    then:
+    thrown(AssertionError)
+  }
+
+  private static class TestLogHandler implements LogHandler {
     Object[] arguments = null
 
     @Override