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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "base/command_line.h"
      6 #include "base/perftimer.h"
      7 #include "base/strings/string_number_conversions.h"
      8 #include "ppapi/c/ppp_messaging.h"
      9 #include "ppapi/proxy/ppapi_proxy_test.h"
     10 #include "ppapi/proxy/serialized_var.h"
     11 #include "ppapi/shared_impl/ppapi_globals.h"
     12 #include "ppapi/shared_impl/var.h"
     13 #include "ppapi/shared_impl/var_tracker.h"
     14 
     15 namespace ppapi {
     16 namespace proxy {
     17 namespace {
     18 
     19 base::WaitableEvent handle_message_called(false, false);
     20 
     21 void HandleMessage(PP_Instance /* instance */, PP_Var message_data) {
     22   StringVar* string_var = StringVar::FromPPVar(message_data);
     23   DCHECK(string_var);
     24   // Retrieve the string to make sure the proxy can't "optimize away" sending
     25   // the actual contents of the string (e.g., by doing a lazy retrieve or
     26   // something). Note that this test is for performance only, and assumes
     27   // other tests check for correctness.
     28   std::string s = string_var->value();
     29   // Do something simple with the string so the compiler won't complain.
     30   if (s.length() > 0)
     31     s[0] = 'a';
     32   PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(message_data);
     33   handle_message_called.Signal();
     34 }
     35 
     36 PPP_Messaging ppp_messaging_mock = {
     37   &HandleMessage
     38 };
     39 
     40 class PppMessagingPerfTest : public TwoWayTest {
     41  public:
     42   PppMessagingPerfTest() : TwoWayTest(TwoWayTest::TEST_PPP_INTERFACE) {
     43     plugin().RegisterTestInterface(PPP_MESSAGING_INTERFACE,
     44                                    &ppp_messaging_mock);
     45   }
     46 };
     47 
     48 }  // namespace
     49 
     50 // Tests the performance of sending strings through the proxy.
     51 TEST_F(PppMessagingPerfTest, StringPerformance) {
     52   // Grab the host-side proxy of ppp_messaging.
     53   const PPP_Messaging* ppp_messaging = static_cast<const PPP_Messaging*>(
     54       host().host_dispatcher()->GetProxiedInterface(
     55           PPP_MESSAGING_INTERFACE));
     56   const PP_Instance kTestInstance = pp_instance();
     57   int seed = 123;
     58   int string_count = 1000;
     59   int max_string_size = 1000000;
     60   CommandLine* command_line = CommandLine::ForCurrentProcess();
     61   if (command_line) {
     62     if (command_line->HasSwitch("seed")) {
     63       base::StringToInt(command_line->GetSwitchValueASCII("seed"),
     64                         &seed);
     65     }
     66     if (command_line->HasSwitch("string_count")) {
     67       base::StringToInt(command_line->GetSwitchValueASCII("string_count"),
     68                         &string_count);
     69     }
     70     if (command_line->HasSwitch("max_string_size")) {
     71       base::StringToInt(command_line->GetSwitchValueASCII("max_string_size"),
     72                         &max_string_size);
     73     }
     74   }
     75   srand(seed);
     76   PerfTimeLogger logger("PppMessagingPerfTest.StringPerformance");
     77   for (int i = 0; i < string_count; ++i) {
     78     const std::string test_string(rand() % max_string_size, 'a');
     79     PP_Var host_string = StringVar::StringToPPVar(test_string);
     80     ppp_messaging->HandleMessage(kTestInstance, host_string);
     81     handle_message_called.Wait();
     82     PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(host_string);
     83   }
     84 }
     85 
     86 }  // namespace proxy
     87 }  // namespace ppapi
     88 
     89