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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/sync_driver/tab_node_pool.h"
#include "base/format_macros.h"
#include "base/logging.h"
#include "base/strings/stringprintf.h"
#include "sync/api/sync_change.h"
#include "sync/api/sync_data.h"
#include "sync/internal_api/public/base/model_type.h"
#include "sync/protocol/session_specifics.pb.h"
#include "sync/protocol/sync.pb.h"
namespace browser_sync {
const size_t TabNodePool::kFreeNodesLowWatermark = 25;
const size_t TabNodePool::kFreeNodesHighWatermark = 100;
TabNodePool::TabNodePool()
: max_used_tab_node_id_(kInvalidTabNodeID) {}
// static
// We start vending tab node IDs at 0.
const int TabNodePool::kInvalidTabNodeID = -1;
TabNodePool::~TabNodePool() {}
// Static
std::string TabNodePool::TabIdToTag(
const std::string machine_tag, int tab_node_id) {
return base::StringPrintf("%s %d", machine_tag.c_str(), tab_node_id);
}
void TabNodePool::AddTabNode(int tab_node_id) {
DCHECK_GT(tab_node_id, kInvalidTabNodeID);
DCHECK(nodeid_tabid_map_.find(tab_node_id) == nodeid_tabid_map_.end());
unassociated_nodes_.insert(tab_node_id);
if (max_used_tab_node_id_ < tab_node_id)
max_used_tab_node_id_ = tab_node_id;
}
void TabNodePool::AssociateTabNode(int tab_node_id,
SessionID::id_type tab_id) {
DCHECK_GT(tab_node_id, kInvalidTabNodeID);
// Remove sync node if it is in unassociated nodes pool.
std::set<int>::iterator u_it = unassociated_nodes_.find(tab_node_id);
if (u_it != unassociated_nodes_.end()) {
unassociated_nodes_.erase(u_it);
} else {
// This is a new node association, the sync node should be free.
// Remove node from free node pool and then associate it with the tab.
std::set<int>::iterator it = free_nodes_pool_.find(tab_node_id);
DCHECK(it != free_nodes_pool_.end());
free_nodes_pool_.erase(it);
}
DCHECK(nodeid_tabid_map_.find(tab_node_id) == nodeid_tabid_map_.end());
nodeid_tabid_map_[tab_node_id] = tab_id;
}
int TabNodePool::GetFreeTabNode(syncer::SyncChangeList* append_changes) {
DCHECK_GT(machine_tag_.length(), 0U);
DCHECK(append_changes);
if (free_nodes_pool_.empty()) {
// Tab pool has no free nodes, allocate new one.
int tab_node_id = ++max_used_tab_node_id_;
std::string tab_node_tag = TabIdToTag(machine_tag_, tab_node_id);
// We fill the new node with just enough data so that in case of a crash/bug
// we can identify the node as our own on re-association and reuse it.
sync_pb::EntitySpecifics entity;
sync_pb::SessionSpecifics* specifics = entity.mutable_session();
specifics->set_session_tag(machine_tag_);
specifics->set_tab_node_id(tab_node_id);
append_changes->push_back(syncer::SyncChange(
FROM_HERE,
syncer::SyncChange::ACTION_ADD,
syncer::SyncData::CreateLocalData(tab_node_tag,
tab_node_tag,
entity)));
// Grow the pool by 1 since we created a new node.
DVLOG(1) << "Adding sync node " << tab_node_id
<< " to tab node id pool";
free_nodes_pool_.insert(tab_node_id);
return tab_node_id;
} else {
// Return the next free node.
return *free_nodes_pool_.begin();
}
}
void TabNodePool::FreeTabNode(int tab_node_id,
syncer::SyncChangeList* append_changes) {
DCHECK(append_changes);
TabNodeIDToTabIDMap::iterator it = nodeid_tabid_map_.find(tab_node_id);
DCHECK(it != nodeid_tabid_map_.end());
nodeid_tabid_map_.erase(it);
FreeTabNodeInternal(tab_node_id, append_changes);
}
void TabNodePool::FreeTabNodeInternal(
int tab_node_id,
syncer::SyncChangeList* append_changes) {
DCHECK(free_nodes_pool_.find(tab_node_id) == free_nodes_pool_.end());
DCHECK(append_changes);
free_nodes_pool_.insert(tab_node_id);
// If number of free nodes exceed kFreeNodesHighWatermark,
// delete sync nodes till number reaches kFreeNodesLowWatermark.
// Note: This logic is to mitigate temporary disassociation issues with old
// clients: http://crbug.com/259918. Newer versions do not need this.
if (free_nodes_pool_.size() > kFreeNodesHighWatermark) {
for (std::set<int>::iterator free_it = free_nodes_pool_.begin();
free_it != free_nodes_pool_.end();) {
const std::string tab_node_tag = TabIdToTag(machine_tag_, *free_it);
append_changes->push_back(syncer::SyncChange(
FROM_HERE,
syncer::SyncChange::ACTION_DELETE,
syncer::SyncData::CreateLocalDelete(tab_node_tag,
syncer::SESSIONS)));
free_nodes_pool_.erase(free_it++);
if (free_nodes_pool_.size() <= kFreeNodesLowWatermark) {
return;
}
}
}
}
bool TabNodePool::IsUnassociatedTabNode(int tab_node_id) {
return unassociated_nodes_.find(tab_node_id) != unassociated_nodes_.end();
}
void TabNodePool::ReassociateTabNode(int tab_node_id,
SessionID::id_type tab_id) {
// Remove from list of unassociated sync_nodes if present.
std::set<int>::iterator it = unassociated_nodes_.find(tab_node_id);
if (it != unassociated_nodes_.end()) {
unassociated_nodes_.erase(it);
} else {
// tab_node_id must be an already associated node.
DCHECK(nodeid_tabid_map_.find(tab_node_id) != nodeid_tabid_map_.end());
}
nodeid_tabid_map_[tab_node_id] = tab_id;
}
SessionID::id_type TabNodePool::GetTabIdFromTabNodeId(
int tab_node_id) const {
TabNodeIDToTabIDMap::const_iterator it = nodeid_tabid_map_.find(tab_node_id);
if (it != nodeid_tabid_map_.end()) {
return it->second;
}
return kInvalidTabID;
}
void TabNodePool::DeleteUnassociatedTabNodes(
syncer::SyncChangeList* append_changes) {
for (std::set<int>::iterator it = unassociated_nodes_.begin();
it != unassociated_nodes_.end();) {
FreeTabNodeInternal(*it, append_changes);
unassociated_nodes_.erase(it++);
}
DCHECK(unassociated_nodes_.empty());
}
// Clear tab pool.
void TabNodePool::Clear() {
unassociated_nodes_.clear();
free_nodes_pool_.clear();
nodeid_tabid_map_.clear();
max_used_tab_node_id_ = kInvalidTabNodeID;
}
size_t TabNodePool::Capacity() const {
return nodeid_tabid_map_.size() + unassociated_nodes_.size() +
free_nodes_pool_.size();
}
bool TabNodePool::Empty() const { return free_nodes_pool_.empty(); }
bool TabNodePool::Full() { return nodeid_tabid_map_.empty(); }
void TabNodePool::SetMachineTag(const std::string& machine_tag) {
machine_tag_ = machine_tag;
}
} // namespace browser_sync
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