Better License

NOTICE

@@ -2,4 +2,13 @@ Apache Dubbo (incubating)
 Copyright 2018 The Apache Software Foundation
 
 This product includes software developed at
-The Apache Software Foundation (http://www.apache.org/).
+The Apache Software Foundation (http://www.apache.org/).
+
+-------------------------------------------------------------------------------
+This product contains a modified portion of 'Netty',
+an event-driven asynchronous network application framework :
+
+  * LICENSE:
+    * licenses/LICENSE.netty.txt (Apache License 2.0)
+  * HOMEPAGE:
+    * http://netty.io/

dubbo-common/src/main/java/com/alibaba/dubbo/common/threadlocal/InternalThread.java

@@ -18,6 +18,11 @@
 package com.alibaba.dubbo.common.threadlocal;
 
 /**
+ * See
+ * <a href="https://github.com/netty/netty/blob/4.1/common/src/main/java/io/netty/util/concurrent/FastThreadLocalThread.java">
+ * FastThreadLocalThread
+ * </a>.
+ * <p>
  * InternalThread
  */
 public class InternalThread extends Thread {

dubbo-common/src/main/java/com/alibaba/dubbo/common/threadlocal/InternalThreadLocal.java

@@ -22,6 +22,11 @@
 import java.util.Set;
 
 /**
+ * See
+ * <a href="https://github.com/netty/netty/blob/4.1/common/src/main/java/io/netty/util/concurrent/FastThreadLocal.java">
+ * FastThreadLocal
+ * </a>.
+ * <p>
  * InternalThreadLocal
  * A special variant of {@link ThreadLocal} that yields higher access performance when accessed from a
  * {@link InternalThread}.

dubbo-common/src/main/java/com/alibaba/dubbo/common/threadlocal/InternalThreadLocalMap.java

@@ -21,6 +21,11 @@
 import java.util.concurrent.atomic.AtomicInteger;
 
 /**
+ * See
+ * <a href="https://github.com/netty/netty/blob/4.1/common/src/main/java/io/netty/util/internal/InternalThreadLocalMap.java">
+ * InternalThreadLocalMap
+ * </a>.
+ * <p>
  * The internal data structure that stores the threadLocal variables for Netty and all {@link InternalThread}s.
  * Note that this class is for internal use only. Use {@link InternalThread}
  * unless you know what you are doing.

licenses/LICENSE.netty.txt

@@ -0,0 +1,202 @@
+
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