refactor

src/SkyWalking.Abstractions/Boot/IBootService.cs

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+using System.Threading.Tasks;
+
+namespace SkyWalking.Boot
+{
+    public interface IBootService
+    {
+        Task Executing();
+
+        Task Executed();
+    }
+}
\ No newline at end of file

src/SkyWalking.Abstractions/Config/AgentConfig.cs

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+namespace SkyWalking.Config
+{
+    public static class AgentConfig
+    {
+        /// <summary>
+        /// Namespace isolates headers in cross propagation. The HEADER name will be 'HeaderName:Namespace'.
+        /// </summary>
+        public static string Namespace { get; set; }
+
+        /// <summary>
+        /// Application code is showed in sky-walking-ui
+        /// </summary>
+        public static string ApplicationCode { get; set; }
+
+        /// <summary>
+        /// Negative or zeor means off ,by default. Sample_N_Per_3_Secs means sampling N TraceSegment in 10 seconds tops.
+        /// </summary>
+        public static int Sample_N_Per_3_Secs = -1;
+
+        /// <summary>
+        /// If the operation name of the first span is included in this set, this segment should be ignored.
+        /// </summary>
+        public static string IgnoreSuffix = ".jpg,.jpeg,.js,.css,.png,.bmp,.gif,.ico,.mp3,.mp4,.html,.svg";
+
+        /// <summary>
+        /// The max number of spans in a single segment. Through this config item, skywalking keep your application memory cost estimated.
+        /// </summary>
+        public static int SpanLimitPerSegment = 300;
+        
+        
+    }
+}
\ No newline at end of file

src/SkyWalking.Abstractions/Context/CarrierItem.cs

@@ -19,6 +19,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using SkyWalking.Config;
 
 namespace SkyWalking.Context
 {
@@ -57,7 +58,14 @@ namespace SkyWalking.Context
 
         public CarrierItem(String headKey, String headValue, CarrierItem next)
         {
-            _headKey = headKey;
+            if (string.IsNullOrEmpty(AgentConfig.Namespace))
+            {
+                _headKey = headKey;
+            }
+            else
+            {
+                _headKey = $"{AgentConfig.Namespace}:{headKey}";
+            }
             _headValue = headValue;
             _next = next;
         }

src/SkyWalking.Abstractions/Context/ITracerContext.cs

@@ -16,12 +16,30 @@
  *
  */
 
-using System;
+using SkyWalking.Context.Trace;
 
 namespace SkyWalking.Context
 {
     public interface ITracerContext
     {
+        void Inject(IContextCarrier carrier);
 
+        void Extract(IContextCarrier carrier);
+        
+        IContextSnapshot Capture { get; }
+        
+        ISpan ActiveSpan { get; }
+
+        void Continued(IContextSnapshot snapshot);
+
+        string GetReadableGlobalTraceId();
+
+        ISpan CreateEntrySpan(string operationName);
+
+        ISpan CreateLocalSpan(string operationName);
+
+        ISpan CreateExitSpan(string operationName, string remotePeer);     
+
+        void StopSpan(ISpan span);
     }
 }

src/SkyWalking.Abstractions/Sampling/ISampler.cs

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+using SkyWalking.Boot;
+
+namespace SkyWalking.Sampling
+{
+    public interface ISampler : IBootService
+    {
+        bool TrySampling();
+
+        void ForceSampled();
+    }
+}
\ No newline at end of file

src/SkyWalking.Core/Context/TracingContext.cs

-namespace SkyWalking.Context
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+using SkyWalking.Context.Trace;
+
+namespace SkyWalking.Context
 {
-    public class TracingContext
+    public class TracingContext: ITracerContext
     {
+        private long _lastWarningTimestamp = 0;
         
+        
+        
+        public void Inject(IContextCarrier carrier)
+        {
+            throw new System.NotImplementedException();
+        }
+
+        public void Extract(IContextCarrier carrier)
+        {
+            throw new System.NotImplementedException();
+        }
+
+        public IContextSnapshot Capture { get; }
+        
+        public ISpan ActiveSpan { get; }
+        
+        public void Continued(IContextSnapshot snapshot)
+        {
+            throw new System.NotImplementedException();
+        }
+
+        public string GetReadableGlobalTraceId()
+        {
+            throw new System.NotImplementedException();
+        }
+
+        public ISpan CreateEntrySpan(string operationName)
+        {
+            throw new System.NotImplementedException();
+        }
+
+        public ISpan CreateLocalSpan(string operationName)
+        {
+            throw new System.NotImplementedException();
+        }
+
+        public ISpan CreateExitSpan(string operationName, string remotePeer)
+        {
+            throw new System.NotImplementedException();
+        }
+
+        public void StopSpan(ISpan span)
+        {
+            throw new System.NotImplementedException();
+        }
     }
 }
\ No newline at end of file