src/sync/notifier/registration_manager.cc

   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 "sync/notifier/registration_manager.h"
   6
   7 #include <algorithm>
   8 #include <cstddef>
   9 #include <iterator>
  10 #include <string>
  11 #include <utility>
  12
  13 #include "base/rand_util.h"
  14 #include "base/stl_util.h"
  15 #include "google/cacheinvalidation/include/invalidation-client.h"
  16 #include "google/cacheinvalidation/include/types.h"
  17 #include "sync/notifier/invalidation_util.h"
  18
  19 namespace syncer {
  20
  21 RegistrationManager::PendingRegistrationInfo::PendingRegistrationInfo() {}
  22
  23 RegistrationManager::RegistrationStatus::RegistrationStatus(
  24     const invalidation::ObjectId& id, RegistrationManager* manager)
  25     : id(id),
  26       registration_manager(manager),
  27       enabled(true),
  28       state(invalidation::InvalidationListener::UNREGISTERED) {
  29   DCHECK(registration_manager);
  30 }
  31
  32 RegistrationManager::RegistrationStatus::~RegistrationStatus() {}
  33
  34 void RegistrationManager::RegistrationStatus::DoRegister() {
  35   CHECK(enabled);
  36   // We might be called explicitly, so stop the timer manually and
  37   // reset the delay.
  38   registration_timer.Stop();
  39   delay = base::TimeDelta();
  40   registration_manager->DoRegisterId(id);
  41   DCHECK(!last_registration_request.is_null());
  42 }
  43
  44 void RegistrationManager::RegistrationStatus::Disable() {
  45   enabled = false;
  46   state = invalidation::InvalidationListener::UNREGISTERED;
  47   registration_timer.Stop();
  48   delay = base::TimeDelta();
  49 }
  50
  51 const int RegistrationManager::kInitialRegistrationDelaySeconds = 5;
  52 const int RegistrationManager::kRegistrationDelayExponent = 2;
  53 const double RegistrationManager::kRegistrationDelayMaxJitter = 0.5;
  54 const int RegistrationManager::kMinRegistrationDelaySeconds = 1;
  55 // 1 hour.
  56 const int RegistrationManager::kMaxRegistrationDelaySeconds = 60 * 60;
  57
  58 RegistrationManager::RegistrationManager(
  59     invalidation::InvalidationClient* invalidation_client)
  60     : invalidation_client_(invalidation_client) {
  61   DCHECK(invalidation_client_);
  62 }
  63
  64 RegistrationManager::~RegistrationManager() {
  65   DCHECK(CalledOnValidThread());
  66   STLDeleteValues(&registration_statuses_);
  67 }
  68
  69 ObjectIdSet RegistrationManager::UpdateRegisteredIds(const ObjectIdSet& ids) {
  70   DCHECK(CalledOnValidThread());
  71
  72   const ObjectIdSet& old_ids = GetRegisteredIds();
  73   const ObjectIdSet& to_register = ids;
  74   ObjectIdSet to_unregister;
  75   std::set_difference(old_ids.begin(), old_ids.end(),
  76                       ids.begin(), ids.end(),
  77                       std::inserter(to_unregister, to_unregister.begin()),
  78                       ObjectIdLessThan());
  79
  80   for (ObjectIdSet::const_iterator it = to_unregister.begin();
  81        it != to_unregister.end(); ++it) {
  82     UnregisterId(*it);
  83   }
  84
  85   for (ObjectIdSet::const_iterator it = to_register.begin();
  86        it != to_register.end(); ++it) {
  87     if (!ContainsKey(registration_statuses_, *it)) {
  88       registration_statuses_.insert(
  89           std::make_pair(*it, new RegistrationStatus(*it, this)));
  90     }
  91     if (!IsIdRegistered(*it)) {
  92       TryRegisterId(*it, false /* is-retry */);
  93     }
  94   }
  95
  96   return to_unregister;
  97 }
  98
  99 void RegistrationManager::MarkRegistrationLost(
 100     const invalidation::ObjectId& id) {
 101   DCHECK(CalledOnValidThread());
 102   RegistrationStatusMap::const_iterator it = registration_statuses_.find(id);
 103   if (it == registration_statuses_.end()) {
 104     DVLOG(1) << "Attempt to mark non-existent registration for "
 105              << ObjectIdToString(id) << " as lost";
 106     return;
 107   }
 108   if (!it->second->enabled) {
 109     return;
 110   }
 111   it->second->state = invalidation::InvalidationListener::UNREGISTERED;
 112   bool is_retry = !it->second->last_registration_request.is_null();
 113   TryRegisterId(id, is_retry);
 114 }
 115
 116 void RegistrationManager::MarkAllRegistrationsLost() {
 117   DCHECK(CalledOnValidThread());
 118   for (RegistrationStatusMap::const_iterator it =
 119            registration_statuses_.begin();
 120        it != registration_statuses_.end(); ++it) {
 121     if (IsIdRegistered(it->first)) {
 122       MarkRegistrationLost(it->first);
 123     }
 124   }
 125 }
 126
 127 void RegistrationManager::DisableId(const invalidation::ObjectId& id) {
 128   DCHECK(CalledOnValidThread());
 129   RegistrationStatusMap::const_iterator it = registration_statuses_.find(id);
 130   if (it == registration_statuses_.end()) {
 131     DVLOG(1) << "Attempt to disable non-existent registration for "
 132              << ObjectIdToString(id);
 133     return;
 134   }
 135   it->second->Disable();
 136 }
 137
 138 // static
 139 double RegistrationManager::CalculateBackoff(
 140     double retry_interval,
 141     double initial_retry_interval,
 142     double min_retry_interval,
 143     double max_retry_interval,
 144     double backoff_exponent,
 145     double jitter,
 146     double max_jitter) {
 147   // scaled_jitter lies in [-max_jitter, max_jitter].
 148   double scaled_jitter = jitter * max_jitter;
 149   double new_retry_interval =
 150       (retry_interval == 0.0) ?
 151       (initial_retry_interval * (1.0 + scaled_jitter)) :
 152       (retry_interval * (backoff_exponent + scaled_jitter));
 153   return std::max(min_retry_interval,
 154                   std::min(max_retry_interval, new_retry_interval));
 155 }
 156
 157 ObjectIdSet RegistrationManager::GetRegisteredIdsForTest() const {
 158   return GetRegisteredIds();
 159 }
 160
 161 RegistrationManager::PendingRegistrationMap
 162     RegistrationManager::GetPendingRegistrationsForTest() const {
 163   DCHECK(CalledOnValidThread());
 164   PendingRegistrationMap pending_registrations;
 165   for (RegistrationStatusMap::const_iterator it =
 166            registration_statuses_.begin();
 167        it != registration_statuses_.end(); ++it) {
 168     const invalidation::ObjectId& id = it->first;
 169     RegistrationStatus* status = it->second;
 170     if (status->registration_timer.IsRunning()) {
 171       pending_registrations[id].last_registration_request =
 172           status->last_registration_request;
 173       pending_registrations[id].registration_attempt =
 174           status->last_registration_attempt;
 175       pending_registrations[id].delay = status->delay;
 176       pending_registrations[id].actual_delay =
 177           status->registration_timer.GetCurrentDelay();
 178     }
 179   }
 180   return pending_registrations;
 181 }
 182
 183 void RegistrationManager::FirePendingRegistrationsForTest() {
 184   DCHECK(CalledOnValidThread());
 185   for (RegistrationStatusMap::const_iterator it =
 186            registration_statuses_.begin();
 187        it != registration_statuses_.end(); ++it) {
 188     if (it->second->registration_timer.IsRunning()) {
 189       it->second->DoRegister();
 190     }
 191   }
 192 }
 193
 194 double RegistrationManager::GetJitter() {
 195   // |jitter| lies in [-1.0, 1.0), which is low-biased, but only
 196   // barely.
 197   //
 198   // TODO(akalin): Fix the bias.
 199   return 2.0 * base::RandDouble() - 1.0;
 200 }
 201
 202 void RegistrationManager::TryRegisterId(const invalidation::ObjectId& id,
 203                                         bool is_retry) {
 204   DCHECK(CalledOnValidThread());
 205   RegistrationStatusMap::const_iterator it = registration_statuses_.find(id);
 206   if (it == registration_statuses_.end()) {
 207     NOTREACHED() << "TryRegisterId called on " << ObjectIdToString(id)
 208                  << " which is not in the registration map";
 209     return;
 210   }
 211   RegistrationStatus* status = it->second;
 212   if (!status->enabled) {
 213     // Disabled, so do nothing.
 214     return;
 215   }
 216   status->last_registration_attempt = base::Time::Now();
 217   if (is_retry) {
 218     // If we're a retry, we must have tried at least once before.
 219     DCHECK(!status->last_registration_request.is_null());
 220     // delay = max(0, (now - last request) + next_delay)
 221     status->delay =
 222         (status->last_registration_request -
 223          status->last_registration_attempt) +
 224         status->next_delay;
 225     base::TimeDelta delay =
 226         (status->delay <= base::TimeDelta()) ?
 227         base::TimeDelta() : status->delay;
 228     DVLOG(2) << "Registering "
 229              << ObjectIdToString(id) << " in "
 230              << delay.InMilliseconds() << " ms";
 231     status->registration_timer.Stop();
 232     status->registration_timer.Start(FROM_HERE,
 233         delay, status, &RegistrationManager::RegistrationStatus::DoRegister);
 234     double next_delay_seconds =
 235         CalculateBackoff(static_cast<double>(status->next_delay.InSeconds()),
 236                          kInitialRegistrationDelaySeconds,
 237                          kMinRegistrationDelaySeconds,
 238                          kMaxRegistrationDelaySeconds,
 239                          kRegistrationDelayExponent,
 240                          GetJitter(),
 241                          kRegistrationDelayMaxJitter);
 242     status->next_delay =
 243         base::TimeDelta::FromSeconds(static_cast<int64>(next_delay_seconds));
 244     DVLOG(2) << "New next delay for "
 245              << ObjectIdToString(id) << " is "
 246              << status->next_delay.InSeconds() << " seconds";
 247   } else {
 248     DVLOG(2) << "Not a retry -- registering "
 249              << ObjectIdToString(id) << " immediately";
 250     status->delay = base::TimeDelta();
 251     status->next_delay = base::TimeDelta();
 252     status->DoRegister();
 253   }
 254 }
 255
 256 void RegistrationManager::DoRegisterId(const invalidation::ObjectId& id) {
 257   DCHECK(CalledOnValidThread());
 258   invalidation_client_->Register(id);
 259   RegistrationStatusMap::const_iterator it = registration_statuses_.find(id);
 260   if (it == registration_statuses_.end()) {
 261     NOTREACHED() << "DoRegisterId called on " << ObjectIdToString(id)
 262                  << " which is not in the registration map";
 263     return;
 264   }
 265   it->second->state = invalidation::InvalidationListener::REGISTERED;
 266   it->second->last_registration_request = base::Time::Now();
 267 }
 268
 269 void RegistrationManager::UnregisterId(const invalidation::ObjectId& id) {
 270   DCHECK(CalledOnValidThread());
 271   invalidation_client_->Unregister(id);
 272   RegistrationStatusMap::iterator it = registration_statuses_.find(id);
 273   if (it == registration_statuses_.end()) {
 274     NOTREACHED() << "UnregisterId called on " << ObjectIdToString(id)
 275                  << " which is not in the registration map";
 276     return;
 277   }
 278   delete it->second;
 279   registration_statuses_.erase(it);
 280 }
 281
 282
 283 ObjectIdSet RegistrationManager::GetRegisteredIds() const {
 284   DCHECK(CalledOnValidThread());
 285   ObjectIdSet ids;
 286   for (RegistrationStatusMap::const_iterator it =
 287            registration_statuses_.begin();
 288        it != registration_statuses_.end(); ++it) {
 289     if (IsIdRegistered(it->first)) {
 290       ids.insert(it->first);
 291     }
 292   }
 293   return ids;
 294 }
 295
 296 bool RegistrationManager::IsIdRegistered(
 297     const invalidation::ObjectId& id) const {
 298   DCHECK(CalledOnValidThread());
 299   RegistrationStatusMap::const_iterator it =
 300       registration_statuses_.find(id);
 301   return it != registration_statuses_.end() &&
 302       it->second->state == invalidation::InvalidationListener::REGISTERED;
 303 }
 304
 305 }  // namespace syncer