From e5c562c4bb6eed969740eac85aad6b80691e8de4 Mon Sep 17 00:00:00 2001
From: wusheng <wu.sheng@foxmail.com>
Date: Tue, 20 Dec 2016 17:59:46 +0800
Subject: [PATCH] add some implements of OT.

---
 .../toolkit/opentracing/SkyWalkingSpan.java   | 11 ++++-
 .../opentracing/SkyWalkingSpanBuilder.java    | 44 ++++++++++++++++---
 .../toolkit/opentracing/SkyWalkingTracer.java |  4 ++
 3 files changed, 53 insertions(+), 6 deletions(-)

diff --git a/skywalking-application-toolkit/skywalking-toolkit-opentracing/src/main/java/com/a/eye/skywalking/toolkit/opentracing/SkyWalkingSpan.java b/skywalking-application-toolkit/skywalking-toolkit-opentracing/src/main/java/com/a/eye/skywalking/toolkit/opentracing/SkyWalkingSpan.java
index 7d5c72639..f4903c53b 100644
--- a/skywalking-application-toolkit/skywalking-toolkit-opentracing/src/main/java/com/a/eye/skywalking/toolkit/opentracing/SkyWalkingSpan.java
+++ b/skywalking-application-toolkit/skywalking-toolkit-opentracing/src/main/java/com/a/eye/skywalking/toolkit/opentracing/SkyWalkingSpan.java
@@ -10,9 +10,18 @@ import java.util.Map;
  * Created by wusheng on 2016/12/20.
  */
 public class SkyWalkingSpan implements Span, SpanContext {
+    private String operationName;
+
+    private long startTime;
+
+    private Map<String, String> tags;
+
     private final Map<String, String> baggageItems;
 
-    SkyWalkingSpan(){
+    SkyWalkingSpan(String operationName, long startTime, Map<String, String> tags){
+        this.operationName = operationName;
+        this.startTime = startTime;
+        this.tags = tags;
         baggageItems = new HashMap<String, String>();
     }
 
diff --git a/skywalking-application-toolkit/skywalking-toolkit-opentracing/src/main/java/com/a/eye/skywalking/toolkit/opentracing/SkyWalkingSpanBuilder.java b/skywalking-application-toolkit/skywalking-toolkit-opentracing/src/main/java/com/a/eye/skywalking/toolkit/opentracing/SkyWalkingSpanBuilder.java
index f69b19401..15cc19d21 100644
--- a/skywalking-application-toolkit/skywalking-toolkit-opentracing/src/main/java/com/a/eye/skywalking/toolkit/opentracing/SkyWalkingSpanBuilder.java
+++ b/skywalking-application-toolkit/skywalking-toolkit-opentracing/src/main/java/com/a/eye/skywalking/toolkit/opentracing/SkyWalkingSpanBuilder.java
@@ -5,6 +5,8 @@ import io.opentracing.Span;
 import io.opentracing.SpanContext;
 import io.opentracing.Tracer;
 
+import java.util.Collections;
+import java.util.HashMap;
 import java.util.Map;
 
 /**
@@ -17,18 +19,38 @@ import java.util.Map;
 public class SkyWalkingSpanBuilder implements Tracer.SpanBuilder {
     private String operationName;
 
+    private long startTime = 0L;
+
+    private final Map<String, String> tags;
+
+    private SpanContext parentContext;
+
     SkyWalkingSpanBuilder(String operationName){
         this.operationName = operationName;
+        this.tags = new HashMap<String, String>();
     }
 
+    /**
+     * In SkyWalkingTracer, SpanContext will not be used. Tracer will build reference by itself.
+     *
+     * @param spanContext
+     * @return
+     */
     @Override
     public Tracer.SpanBuilder asChildOf(SpanContext spanContext) {
-        return null;
+        this.parentContext = spanContext;
+        return this;
     }
 
+    /**
+     * In SkyWalkingTracer, Parent Span will not be used. Tracer will build reference by itself.
+     * @param span
+     * @return
+     */
     @Override
     public Tracer.SpanBuilder asChildOf(Span span) {
-        return null;
+        asChildOf(span.context());
+        return this;
     }
 
     @Override
@@ -42,31 +64,43 @@ public class SkyWalkingSpanBuilder implements Tracer.SpanBuilder {
 
     @Override
     public Tracer.SpanBuilder withTag(String key, String value) {
+        if (key != null && value != null) {
+            tags.put(key, value);
+        }
         return this;
     }
 
     @Override
     public Tracer.SpanBuilder withTag(String key, boolean value) {
+        if (key != null) {
+            tags.put(key, Boolean.toString(value));
+        }
         return this;
     }
 
     @Override
     public Tracer.SpanBuilder withTag(String key, Number value) {
+        if (key != null && value != null) {
+            tags.put(key, value.toString());
+        }
         return this;
     }
 
     @Override
-    public Tracer.SpanBuilder withStartTimestamp(long microseconds) {
+    public Tracer.SpanBuilder withStartTimestamp(long startTime) {
+        this.startTime = startTime;
         return this;
     }
 
     @Override
     public Span start() {
-        return new SkyWalkingSpan();
+        return new SkyWalkingSpan(this.operationName, this.startTime, this.tags);
     }
 
     @Override
     public Iterable<Map.Entry<String, String>> baggageItems() {
-        return null;
+        return parentContext == null
+                ? Collections.<String, String>emptyMap().entrySet()
+                : parentContext.baggageItems();
     }
 }
diff --git a/skywalking-application-toolkit/skywalking-toolkit-opentracing/src/main/java/com/a/eye/skywalking/toolkit/opentracing/SkyWalkingTracer.java b/skywalking-application-toolkit/skywalking-toolkit-opentracing/src/main/java/com/a/eye/skywalking/toolkit/opentracing/SkyWalkingTracer.java
index 8b1aa7968..4f91b3a1d 100644
--- a/skywalking-application-toolkit/skywalking-toolkit-opentracing/src/main/java/com/a/eye/skywalking/toolkit/opentracing/SkyWalkingTracer.java
+++ b/skywalking-application-toolkit/skywalking-toolkit-opentracing/src/main/java/com/a/eye/skywalking/toolkit/opentracing/SkyWalkingTracer.java
@@ -5,6 +5,10 @@ import io.opentracing.Tracer;
 import io.opentracing.propagation.Format;
 
 /**
+ * All source code in SkyWalkingTracer acts like an NoopTracer.
+ * Actually, it is NOT.
+ * The whole logic will be added after toolkit-activation.
+ *
  * Created by wusheng on 2016/12/20.
  */
 public class SkyWalkingTracer implements Tracer{