[#69] Added javadocs

fixes #69

spring-cloud-sleuth-zipkin-stream/src/main/java/org/springframework/cloud/sleuth/zipkin/stream/EnableZipkinStreamServer.java

@@ -25,6 +25,16 @@ import org.springframework.context.annotation.Import;
 
 import zipkin.server.EnableZipkinServer;
 
+/**
+ * When enabled, instrumented apps will transport spans over a
+ * Spring Cloud Stream, for example RabbitMQ.
+ *
+ * @author Dave Syer
+ *
+ * @since 1.0.0
+ *
+ * @see ZipkinMessageListener
+ */
 @Target(ElementType.TYPE)
 @Retention(RetentionPolicy.RUNTIME)
 @Documented

spring-cloud-sleuth-zipkin-stream/src/main/java/org/springframework/cloud/sleuth/zipkin/stream/SamplingZipkinSpanIterator.java

@@ -32,6 +32,10 @@ import zipkin.Span.Builder;
 
 /**
  * This converts sleuth spans to zipkin ones, skipping invalid or unsampled.
+ *
+ * @author Adrian Cole
+ *
+ * @since 1.0.0
  */
 final class SamplingZipkinSpanIterator implements Iterator<zipkin.Span> {
 

spring-cloud-sleuth-zipkin-stream/src/main/java/org/springframework/cloud/sleuth/zipkin/stream/ZipkinMessageListener.java

@@ -40,6 +40,16 @@ import zipkin.Sampler;
 import zipkin.Span.Builder;
 import zipkin.SpanStore;
 
+/**
+ * A message listener that is turned on if Sleuth Stream is disabled.
+ * Asynchronously stores the received spans in a {@link SpanStore}.
+ *
+ * @author Dave Syer
+ *
+ * @since 1.0.0
+ *
+ * @see NotSleuthStreamClient
+ */
 @MessageEndpoint
 @Conditional(NotSleuthStreamClient.class)
 public class ZipkinMessageListener {
@@ -77,9 +87,7 @@ public class ZipkinMessageListener {
 	}
 
 	/**
-	 * Creates a list of Annotations that are present in sleuth Span object.
-	 *
-	 * @return list of Annotations that could be added to Zipkin Span.
+	 * Adds binary annotations from the sleuth Span
 	 */
 	static void addZipkinBinaryAnnotations(Builder zipkinSpan, Span span,
 			Endpoint endpoint) {