Adds concurrent_server example

examples/concurrent_server/concurrent_server.cpp

@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 2011, Peter Thorson. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the WebSocket++ Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ */
+
+#include "../../src/websocketpp.hpp"
+
+#include <boost/thread/thread.hpp>
+#include <boost/thread/mutex.hpp>
+#include <boost/thread/condition_variable.hpp>
+
+#include <cstring>
+
+using websocketpp::server;
+
+struct request {
+    server::handler::connection_ptr con;
+    int                             value;
+};
+
+class request_coordinator {
+public:
+    void add_request(const request& r) {
+        boost::unique_lock<boost::mutex> lock(m_lock);
+        m_requests.push(r);
+        lock.unlock();
+        m_cond.notify_one();
+    }
+    
+    void get_request(request& value) {
+        boost::unique_lock<boost::mutex> lock(m_lock);
+        
+        while (m_requests.empty()) {
+            m_cond.wait(lock);
+        }
+        
+        value = m_requests.front();
+        m_requests.pop();
+    }
+private:
+    std::queue<request>         m_requests;
+    boost::mutex                m_lock;
+    boost::condition_variable   m_cond;
+};
+
+class concurrent_server_handler : public server::handler {
+public:
+    concurrent_server_handler(request_coordinator& c) : m_coordinator(c) {}
+    
+    void on_message(connection_ptr con,message_ptr msg) {
+        int value = atoi(msg->get_payload().c_str());
+        
+        if (value == 0) {
+            con->send("Invalid sleep value.");
+        } else {
+            request r;
+            r.con = con;
+            r.value = value;
+            m_coordinator.add_request(r);
+        }
+    }
+private:
+    request_coordinator& m_coordinator;
+};
+
+
+
+void process_requests(request_coordinator* coordinator);
+
+void process_requests(request_coordinator* coordinator) {
+    request r;
+    
+    while (1) {
+        coordinator->get_request(r);
+        
+        std::stringstream response;
+        response << "Sleeping for " << r.value << " milliseconds!";
+        r.con->send(response.str());
+        
+        boost::this_thread::sleep(boost::posix_time::milliseconds(r.value));
+        
+        response.str("");
+        response << "Done sleeping for " << r.value << " milliseconds!";
+        r.con->send(response.str());
+    }
+}
+
+int main(int argc, char* argv[]) {
+    unsigned short port = 9002;
+        
+    if (argc == 2) {
+        port = atoi(argv[1]);
+        
+        if (port == 0) {
+            std::cout << "Unable to parse port input " << argv[1] << std::endl;
+            return 1;
+        }
+    }
+    
+    try {       
+        request_coordinator rc;
+        
+        server::handler::ptr h(new concurrent_server_handler(rc));
+        server echo_endpoint(h);
+        
+        echo_endpoint.alog().unset_level(websocketpp::log::alevel::ALL);
+        echo_endpoint.elog().unset_level(websocketpp::log::elevel::ALL);
+        
+        echo_endpoint.elog().set_level(websocketpp::log::elevel::ERROR);
+        echo_endpoint.elog().set_level(websocketpp::log::elevel::FATAL);
+        
+        boost::thread t1(boost::bind(&process_requests, &rc));
+        boost::thread t2(boost::bind(&process_requests, &rc));
+        
+        std::cout << "Starting WebSocket sleep server on port " << port << std::endl;
+        echo_endpoint.listen(port);
+    } catch (std::exception& e) {
+        std::cerr << "Exception: " << e.what() << std::endl;
+    }
+    
+    return 0;
+}