Added example file

Author: etr

examples/deferred_with_accumulator.cpp

@@ -0,0 +1,70 @@
+/*
+     This file is part of libhttpserver
+     Copyright (C) 2011, 2012, 2013, 2014, 2015 Sebastiano Merlino
+
+     This library is free software; you can redistribute it and/or
+     modify it under the terms of the GNU Lesser General Public
+     License as published by the Free Software Foundation; either
+     version 2.1 of the License, or (at your option) any later version.
+
+     This library is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     Lesser General Public License for more details.
+
+     You should have received a copy of the GNU Lesser General Public
+     License along with this library; if not, write to the Free Software
+     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
+     USA
+*/
+
+#include <atomic>
+#include <httpserver.hpp>
+
+using namespace httpserver;
+
+std::atomic<int> counter;
+
+ssize_t test_callback (std::shared_ptr<std::atomic<int> > closure_data, char* buf, size_t max) {
+    int reqid;
+    if (closure_data == nullptr) {
+        reqid = -1;
+    } else {
+        reqid = *closure_data;
+    }
+
+    // only first 5 connections can be established
+    if (reqid >= 5) {
+        return -1;
+    } else {
+        // respond corresponding request IDs to the clients
+        std::string str = "";
+        str += std::to_string(reqid) + " ";
+        memset(buf, 0, max);
+        std::copy(str.begin(), str.end(), buf);
+
+        // keep sending reqid
+        sleep(1);
+
+        return (ssize_t)max;
+    }
+}
+
+class deferred_resource : public http_resource {
+    public:
+        const std::shared_ptr<http_response> render_GET(const http_request& req) {
+            std::shared_ptr<std::atomic<int> > closure_data(new std::atomic<int>(counter++));
+            return std::shared_ptr<deferred_response<std::atomic<int> > >(new deferred_response<std::atomic<int> >(test_callback, closure_data, "cycle callback response"));
+        }
+};
+
+int main(int argc, char** argv) {
+    webserver ws = create_webserver(8080);
+
+    deferred_resource hwr;
+    ws.register_resource("/hello", &hwr);
+    ws.start(true);
+
+    return 0;
+}
+