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Posted to commits@dubbo.apache.org by li...@apache.org on 2018/11/21 07:47:02 UTC
[incubator-dubbo-website] branch asf-site updated: add RPC protocol
description
This is an automated email from the ASF dual-hosted git repository.
liujun pushed a commit to branch asf-site
in repository https://gitbox.apache.org/repos/asf/incubator-dubbo-website.git
The following commit(s) were added to refs/heads/asf-site by this push:
new e3f8127 add RPC protocol description
e3f8127 is described below
commit e3f812727a5d58ad9f3921647349afcdedb855a6
Author: ken.lj <ke...@gmail.com>
AuthorDate: Wed Nov 21 15:46:58 2018 +0800
add RPC protocol description
---
docs/zh-cn/dev/implementation.md | 71 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 71 insertions(+)
diff --git a/docs/zh-cn/dev/implementation.md b/docs/zh-cn/dev/implementation.md
index c1f664b..7225052 100644
--- a/docs/zh-cn/dev/implementation.md
+++ b/docs/zh-cn/dev/implementation.md
@@ -136,6 +136,77 @@ public class DemoServiceImpl implements DemoService {
+
+- Magic - Magic High & Magic Low (16 bits)
+
+ Identifies dubbo protocol with value: 0xdabb
+
+- Req/Res (1 bit)
+
+ Identifies this is a request or response. Request - 1; Response - 0.
+
+- 2 Way (1 bit)
+
+ Only useful when Req/Res is 1 (Request), expect for a return value from server or not. Set to 1 if need a return value from server.
+
+- Event (1 bit)
+
+ Identifies an event message or not, for example, heartbeat event. Set to 1 if this is an event.
+
+- Serialization ID (5 bit)
+
+ Identifies serialization type: the value for fastjson is 6.
+
+- Status (8 bits)
+
+ Only useful when Req/Res is 0 (Response), identifies the status of response
+
+ - 20 - OK
+ - 30 - CLIENT_TIMEOUT
+ - 31 - SERVER_TIMEOUT
+ - 40 - BAD_REQUEST
+ - 50 - BAD_RESPONSE
+ - 60 - SERVICE_NOT_FOUND
+ - 70 - SERVICE_ERROR
+ - 80 - SERVER_ERROR
+ - 90 - CLIENT_ERROR
+ - 100 - SERVER_THREADPOOL_EXHAUSTED_ERROR
+
+- Request ID (64 bits)
+
+ Identifies an unique request. Numeric (long).
+
+- Data Length (32)
+
+ Length of the content (the variable part) after serialization, counted by bytes. Numeric (integer).
+
+- Variable Part
+
+ Each part is a byte[] after serialization with specific serialization type, identifies by Serialization ID.
+
+Every part is a byte[] after serialization with specific serialization type, identifies by Serialization ID
+
+1. If the content is a Request (Req/Res = 1), each part consists of the content, in turn is:
+ - Dubbo version
+ - Service name
+ - Service version
+ - Method name
+ - Method parameter types
+ - Method arguments
+ - Attachments
+
+1. If the content is a Response (Req/Res = 0), each part consists of the content, in turn is:
+ - Return value type, identifies what kind of value returns from server side: RESPONSE_NULL_VALUE - 2, RESPONSE_VALUE - 1, RESPONSE_WITH_EXCEPTION - 0.
+ - Return value, the real value returns from server.
+
+
+**注意：**对于(Variable Part)变长部分，当前版本的dubbo框架使用json序列化时，在每部分内容间额外增加了换行符作为分隔，请选手在Variable Part的每个part后额外增加换行符， 如：
+```
+Dubbo version bytes (换行符)
+Service name bytes (换行符)
+...
+```
+
### 线程派发模型
