Add support for JSON-RPC subscriptions.

src/cpp/ripple/RPCSub.cpp

@@ -1,12 +1,73 @@
+#include <boost/thread.hpp>
+
 #include "RPCSub.h"
 
+#include "CallRPC.h"
+
 RPCSub::RPCSub(const std::string& strUrl, const std::string& strUsername, const std::string& strPassword)
     : mUrl(strUrl), mUsername(strUsername), mPassword(strPassword)
 {
+    mId	= 1;
+}
 
+void RPCSub::sendThread()
+{
+    Json::Value	jvEvent;
+    bool	bSend;
+
+    do
+    {
+	{
+	    // Obtain the lock to manipulate the queue and change sending.
+	    boost::mutex::scoped_lock sl(mLockInfo);
+
+	    if (mDeque.empty())
+	    {
+		mSending	= false;
+		bSend		= false;
+	    }
+	    else
+	    {
+		std::pair<int, Json::Value> pEvent  = mDeque.front();
+
+		mDeque.pop_front();
+
+		jvEvent		= pEvent.second;
+		jvEvent["id"]	= pEvent.first;
+
+		bSend		= true;
+	    }
+	}
+
+	// Send outside of the lock.
+	if (bSend)
+	{
+	    // Drop result.
+	    (void) callRPC(mIp, mPort, mUsername, mPassword, "event", jvEvent);
+
+	    sendThread();
+	}
+    } while (bSend);
 }
 
 void RPCSub::send(const Json::Value& jvObj)
 {
+    boost::mutex::scoped_lock sl(mLockInfo);
 
+    if (RPC_EVENT_QUEUE_MAX == mDeque.size())
+    {
+	// Drop the previous event.
+
+	mDeque.pop_back();
+    }
+
+    mDeque.push_back(std::make_pair(mId++, jvObj));
+
+    if (!mSending)
+    {
+	// Start a sending thread.
+	mSending    = true;
+
+	boost::thread(boost::bind(&RPCSub::sendThread, this)).detach();
+    }
 }