Fix jedis missing tag: span.kind.

skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/boot/ServiceManager.java

@@ -17,36 +17,35 @@ public enum ServiceManager {
     INSTANCE;
 
     private static ILog logger = LogManager.getLogger(StatusBootService.class);
-    private volatile boolean isStarted = false;
-    private Map<Class, BootService> bootedServices;
+    private Map<Class, BootService> bootedServices = new HashMap<Class, BootService>();
 
     public void boot() {
-        if (!isStarted) {
+        bootedServices = loadAllServices();
+    }
+
+    private Map<Class, BootService> loadAllServices() {
+        HashMap<Class, BootService> bootedServices = new HashMap<Class, BootService>();
+        Iterator<BootService> serviceIterator = load().iterator();
+        while (serviceIterator.hasNext()) {
+            BootService bootService = serviceIterator.next();
             try {
-                bootedServices = new HashMap<Class, BootService>();
-                Iterator<BootService> serviceIterator = load().iterator();
-                while (serviceIterator.hasNext()) {
-                    BootService bootService = serviceIterator.next();
-                    try {
-                        bootService.bootUp();
-                        bootedServices.put(bootService.getClass(), bootService);
-                    } catch (Throwable e) {
-                        logger.error(e, "ServiceManager try to start [{}] fail.", bootService.getClass().getName());
-                    }
-                }
-            } finally {
-                isStarted = true;
+                bootService.bootUp();
+                bootedServices.put(bootService.getClass(), bootService);
+            } catch (Throwable e) {
+                logger.error(e, "ServiceManager try to start [{}] fail.", bootService.getClass().getName());
             }
         }
+        return bootedServices;
     }
 
     /**
      * Find a {@link BootService} implementation, which is already started.
+     *
      * @param serviceClass class name.
      * @param <T> {@link BootService} implementation class.
      * @return {@link BootService} instance
      */
-    public <T extends BootService> T findService(Class<T> serviceClass){
+    public <T extends BootService> T findService(Class<T> serviceClass) {
         return (T)bootedServices.get(serviceClass);
     }
 

skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/sampling/SamplingService.java

@@ -21,7 +21,7 @@ public class SamplingService implements BootService {
 
     private volatile boolean on = false;
     private volatile int rate = 0;
-    private volatile int rollingSeed = 0;
+    private volatile int rollingSeed = 1;
 
     @Override
     public void bootUp() throws Throwable {
@@ -39,9 +39,10 @@ public class SamplingService implements BootService {
 
     public void trySampling(TraceSegment segment) {
         if (on) {
-            if (rollingSeed++ != rate) {
+            if (rollingSeed % rate != 0) {
                 segment.setSampled(false);
             }
+            rollingSeed++;
         }
     }
 
@@ -59,7 +60,7 @@ public class SamplingService implements BootService {
         if(on) {
             if (!segment.isSampled() && carrier.isSampled()) {
                 segment.setSampled(true);
-                this.rollingSeed = 0;
+                this.rollingSeed = 1;
             }
         }
     }

skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/sampling/SamplingServiceTest.java

@@ -0,0 +1,36 @@
+package com.a.eye.skywalking.api.sampling;
+
+import com.a.eye.skywalking.api.boot.ServiceManager;
+import com.a.eye.skywalking.api.conf.Config;
+import com.a.eye.skywalking.trace.TraceSegment;
+import org.junit.AfterClass;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * @author wusheng
+ */
+public class SamplingServiceTest {
+    @Test
+    public void test50Percent(){
+        Config.Agent.SAMPLING_RATE = 5000;
+        ServiceManager.INSTANCE.boot();
+
+        TraceSegment segment = new TraceSegment();
+        Assert.assertTrue(segment.isSampled());
+
+        SamplingService service = ServiceManager.INSTANCE.findService(SamplingService.class);
+        service.trySampling(segment);
+        Assert.assertFalse(segment.isSampled());
+
+        segment = new TraceSegment();
+        service.trySampling(segment);
+        Assert.assertTrue(segment.isSampled());
+    }
+
+    @AfterClass
+    public static void clear(){
+        Config.Agent.SAMPLING_RATE = 10000;
+        ServiceManager.INSTANCE.boot();
+    }
+}

skywalking-sniffer/skywalking-sdk-plugin/jedis-2.x-plugin/src/main/java/com/a/eye/skywalking/plugin/jedis/v2/JedisMethodInterceptor.java

@@ -50,6 +50,7 @@ public class JedisMethodInterceptor extends NoCocurrencyAceessObject implements
                 Span span = ContextManager.createSpan("Jedis/" + interceptorContext.methodName());
                 Tags.COMPONENT.set(span, REDIS_COMPONENT);
                 Tags.DB_TYPE.set(span, REDIS_COMPONENT);
+                Tags.SPAN_KIND.set(span, Tags.SPAN_KIND_CLIENT);
                 tagPeer(span, context);
                 Tags.SPAN_LAYER.asDB(span);
                 if (StringUtil.isEmpty(context.get(KEY_OF_REDIS_HOST, String.class))) {