Port the gears geolocation network provider to Chromium...

chrome/browser/geolocation/backoff_manager.cc

-// Copyright 2008, Google Inc.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are met:
-//
-//  1. Redistributions of source code must retain the above copyright notice,
-//     this list of conditions and the following disclaimer.
-//  2. 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.
-//  3. Neither the name of Google Inc. 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 AUTHOR ``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 THE AUTHOR 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.
-
-// TODO(joth): port to chromium
-#if 0
-
-#include "gears/geolocation/backoff_manager.h"
-
-#include <assert.h>
-
-// The baseline minimum period between network requests.
-static const int kBaselineMinimumRequestInterval = 1000 * 5;  // 5 seconds
-// The upper limit of the minimum period between network requests.
-static const int kMinimumRequestIntervalLimit = 1000 * 60 * 60 * 3;  // 3 hours
-
-
-// static
-BackoffManager::ServerMap BackoffManager::servers_;
-
-// static
-Mutex BackoffManager::servers_mutex_;
-
-// static
-void BackoffManager::ReportRequest(const std::string16 &url) {
-  MutexLock lock(&servers_mutex_);
-  ServerMap::iterator iter = servers_.find(url);
-  if (iter != servers_.end()) {
-    iter->second.first = GetCurrentTimeMillis();
-  } else {
-    servers_[url] = std::make_pair(GetCurrentTimeMillis(),
-                                   kBaselineMinimumRequestInterval);
-  }
-}
-
-// static
-int64 BackoffManager::ReportResponse(const std::string16 &url,
-                                     bool server_error) {
-  // Use exponential back-off on server error.
-  MutexLock lock(&servers_mutex_);
-  ServerMap::iterator iter = servers_.find(url);
-  assert(iter != servers_.end());
-  int64 *interval = &iter->second.second;
-  if (server_error) {
-    if (*interval < kMinimumRequestIntervalLimit) {
-      // Increase interval by between 90% and 110%.
-      srand(static_cast<unsigned int>(GetCurrentTimeMillis()));
-      double increment_proportion = 0.9 + 0.2 * rand() / RAND_MAX;
-      int64 increment = static_cast<int64>(*interval * increment_proportion);
-      if (increment > kMinimumRequestIntervalLimit - *interval) {
-        *interval = kMinimumRequestIntervalLimit;
-      } else {
-        *interval += increment;
-      }
-    }
-  } else {
-    *interval = kBaselineMinimumRequestInterval;
-  }
-  return iter->second.first + *interval;
-}
-
-#endif  // if 0