From 92f00fb022dae290c38deb41dbc6c9a254537670 Mon Sep 17 00:00:00 2001
From: Mark Slee <mcslee@apache.org>
Date: Wed, 25 Oct 2006 01:28:17 +0000
Subject: [PATCH] Framing option for non blocking server

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@664835 13f79535-47bb-0310-9956-ffa450edef68
---
 lib/cpp/src/server/TNonblockingServer.cc | 30 ++++++++++++++++++++++--
 lib/cpp/src/server/TNonblockingServer.h  | 22 ++++++++++++++---
 2 files changed, 47 insertions(+), 5 deletions(-)

diff --git a/lib/cpp/src/server/TNonblockingServer.cc b/lib/cpp/src/server/TNonblockingServer.cc
index 14fb5bc1..bc39877a 100644
--- a/lib/cpp/src/server/TNonblockingServer.cc
+++ b/lib/cpp/src/server/TNonblockingServer.cc
@@ -164,7 +164,6 @@ void TConnection::transition() {
       return;
     }
 
-
     // Get the result of the operation
     outputTransport_->getBuffer(&writeBuffer_, &writeBufferSize_);
 
@@ -175,7 +174,17 @@ void TConnection::transition() {
       // Move into write state
       writeBufferPos_ = 0;
       socketState_ = SOCKET_SEND;
-      appState_ = APP_SEND_RESULT;
+
+      if (server_->getFrameResponses()) {
+        // Put the frame size into the write buffer
+        appState_ = APP_SEND_FRAME_SIZE;
+        frameSize_ = (int32_t)htonl(writeBufferSize_);
+        writeBuffer_ = (uint8_t*)&frameSize_;
+        writeBufferSize_ = 4;
+      } else {
+        // Go straight into sending the result, do not frame it
+        appState_ = APP_SEND_RESULT;
+      }
 
       // Socket into write mode
       setWrite();
@@ -188,11 +197,28 @@ void TConnection::transition() {
 
     // In this case, the request was asynchronous and we should fall through
     // right back into the read frame header state
+    goto LABEL_APP_INIT;
+
+  case APP_SEND_FRAME_SIZE:
+
+    // Refetch the result of the operation since we put the frame size into
+    // writeBuffer_
+    outputTransport_->getBuffer(&writeBuffer_, &writeBufferSize_);
+    writeBufferPos_ = 0;
+
+    // Now in send result state
+    appState_ = APP_SEND_RESULT;
+
+    // Go to work on the socket right away, probably still writeable
+    workSocket();
+
+    return;
 
   case APP_SEND_RESULT:
 
     // N.B.: We also intentionally fall through here into the INIT state!
 
+  LABEL_APP_INIT:
   case APP_INIT:
 
     // Clear write buffer variables
diff --git a/lib/cpp/src/server/TNonblockingServer.h b/lib/cpp/src/server/TNonblockingServer.h
index 565486c3..ec024c03 100644
--- a/lib/cpp/src/server/TNonblockingServer.h
+++ b/lib/cpp/src/server/TNonblockingServer.h
@@ -7,8 +7,6 @@
 #include <stack>
 #include <event.h>
 
-#
-
 namespace facebook { namespace thrift { namespace server { 
 
 using boost::shared_ptr;
@@ -38,6 +36,9 @@ class TNonblockingServer : public TServer {
   // Port server runs on
   int port_;
 
+  // Whether to frame responses
+  bool frameResponses_;
+
   /**
    * This is a stack of all the objects that have been created but that
    * are NOT currently in use. When we close a connection, we place it on this
@@ -52,10 +53,21 @@ class TNonblockingServer : public TServer {
   TNonblockingServer(shared_ptr<TProcessor> processor,
                      shared_ptr<TServerOptions> options,
                      int port) :
-    TServer(processor, options), serverSocket_(0), port_(port) {}
+    TServer(processor, options),
+    serverSocket_(0),
+    port_(port),
+    frameResponses_(true) {}
     
   ~TNonblockingServer() {}
 
+  void setFrameResponses(bool frameResponses) {
+    frameResponses_ = frameResponses;
+  }
+
+  bool getFrameResponses() {
+    return frameResponses_;
+  }
+
   TConnection* createConnection(int socket, short flags);
 
   void returnConnection(TConnection* connection);
@@ -86,6 +98,7 @@ enum TAppState {
   APP_INIT,
   APP_READ_FRAME_SIZE,
   APP_READ_REQUEST,
+  APP_SEND_FRAME_SIZE,
   APP_SEND_RESULT
 };
 
@@ -135,6 +148,9 @@ class TConnection {
   // How far through writing are we?
   uint32_t writeBufferPos_;
 
+  // Frame size
+  int32_t frameSize_;
+
   // Transport to read from
   shared_ptr<TMemoryBuffer> inputTransport_;
 
-- 
2.17.1