Support XMemcached V2.x

apm-sniffer/apm-sdk-plugin/xmemcached-2.x-plugin/src/main/java/org/skywalking/apm/plugin/xmemcached/v2/XMemcachedConstructorWithComplexArgInterceptor.java

@@ -34,13 +34,13 @@ public class XMemcachedConstructorWithComplexArgInterceptor implements InstanceC
         Map<InetSocketAddress, InetSocketAddress> inetSocketAddressMap = (Map<InetSocketAddress, InetSocketAddress>)allArguments[6];
         StringBuilder master = new StringBuilder();
         for (Entry<InetSocketAddress, InetSocketAddress> entry : inetSocketAddressMap.entrySet()) {
-            if (master.length() <= 0) {
+            if (master.length() == 0) {
                 master = append(master,entry.getKey());
             }
             memcachConnInfo = append(memcachConnInfo, entry.getValue());
         }
         memcachConnInfo =  master.append(memcachConnInfo);
-        int l = memcachConnInfo.length();
+        Integer l = memcachConnInfo.length();
         if (l > 1) {
             memcachConnInfo = new StringBuilder(memcachConnInfo.substring(0, l - 1));
         }

apm-sniffer/apm-sdk-plugin/xmemcached-2.x-plugin/src/main/java/org/skywalking/apm/plugin/xmemcached/v2/XMemcachedMethodInterceptor.java

@@ -37,8 +37,8 @@ public class XMemcachedMethodInterceptor implements InstanceMethodsAroundInterce
         Class<?>[] argumentsTypes, MethodInterceptResult result) throws Throwable {
         String peer = String.valueOf(objInst.getSkyWalkingDynamicField());
         AbstractSpan span = ContextManager.createExitSpan(XMEMCACHED + method.getName(), peer);
-        span.setComponent(ComponentsDefine.MEMCACHE);
-        Tags.DB_TYPE.set(span, ComponentsDefine.MEMCACHE.getName());
+        span.setComponent(ComponentsDefine.MEMCACHED);
+        Tags.DB_TYPE.set(span, ComponentsDefine.MEMCACHED.getName());
         SpanLayer.asDB(span);
         Tags.DB_STATEMENT.set(span, method.getName() + " " + allArguments[0]);
     }

apm-sniffer/apm-sdk-plugin/xmemcached-2.x-plugin/src/test/java/org/skywalking/apm/plugin/xmemcached/v2/XMemcachedMethodInterceptorTest.java

@@ -121,21 +121,11 @@ public class XMemcachedMethodInterceptorTest {
         assertThat(SpanHelper.getLayer(span), is(SpanLayer.DB));
     }
     
-    private Method getMockSetMethod() {
-        try {
-            return XMemcachedClient.class.getMethod("set", String.class, int.class, Object.class);
-        } catch (NoSuchMethodException e) {
-            e.printStackTrace();
-            return null;
-        }
+    private Method getMockSetMethod() throws Exception {
+        return XMemcachedClient.class.getMethod("set", String.class, int.class, Object.class);
     }
     
-    private Method getMockGetMethod() {
-        try {
-            return XMemcachedClient.class.getMethod("get", String.class);
-        } catch (NoSuchMethodException e) {
-            e.printStackTrace();
-            return null;
-        }
+    private Method getMockGetMethod() throws Exception {
+        return XMemcachedClient.class.getMethod("get", String.class);
     }
 }
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