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// Copyright 2015 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.
#import "ios/web/browsing_data_partition_impl.h"
#include "base/logging.h"
#include "ios/web/public/browser_state.h"
#include "ios/web/public/browsing_data_partition_client.h"
#import "ios/web/public/crw_browsing_data_store.h"
#include "ios/web/public/web_thread.h"
// A class that observes the |mode| changes in a CRWBrowsingDataStore using KVO.
// Maintains a count of all the CRWBrowsingDataStores whose mode is out of sync
// with their corresponding ActiveStateManager's active state.
@interface CRWBrowsingDataStoreModeObserver : NSObject
// The total count of the CRWBrowsingDataStores -- that are being observed --
// whose mode is out of sync with their associated ActiveStateManager's active
// state.
@property(nonatomic, assign) NSUInteger outOfSyncStoreCount;
// Adds |browsingDataStore| to the list of the CRWBrowsingDataStores that are
// being observed for KVO changes in the |mode| value. |browserState| cannot be
// null and the |browserState|'s associated CRWBrowsingDataStore must be
// |browsingDataStore|.
// The |browsingDataStore|'s mode must not already be |CHANGING|.
- (void)startObservingBrowsingDataStore:(CRWBrowsingDataStore*)browsingDataStore
browserState:(web::BrowserState*)browserState;
// Stops observing |browsingDataStore| for its |mode| change.
// The |browsingDataStore|'s mode must not be |CHANGING|.
- (void)stopObservingBrowsingDataStore:(CRWBrowsingDataStore*)browsingDataStore;
@end
@implementation CRWBrowsingDataStoreModeObserver
@synthesize outOfSyncStoreCount = _outOfSyncStoreCount;
- (void)startObservingBrowsingDataStore:(CRWBrowsingDataStore*)browsingDataStore
browserState:(web::BrowserState*)browserState {
web::BrowsingDataPartition* browsing_data_partition =
web::BrowserState::GetBrowsingDataPartition(browserState);
DCHECK(browsing_data_partition);
DCHECK_EQ(browsing_data_partition->GetBrowsingDataStore(), browsingDataStore);
DCHECK_NE(web::CHANGING, browsingDataStore.mode);
[browsingDataStore addObserver:self
forKeyPath:@"mode"
options:0
context:browserState];
}
- (void)stopObservingBrowsingDataStore:
(CRWBrowsingDataStore*)browsingDataStore {
DCHECK_NE(web::CHANGING, browsingDataStore.mode);
[browsingDataStore removeObserver:self forKeyPath:@"mode"];
}
- (void)observeValueForKeyPath:(NSString*)keyPath
ofObject:(CRWBrowsingDataStore*)browsingDataStore
change:(NSDictionary*)change
context:(void*)context {
DCHECK([keyPath isEqual:@"mode"]);
DCHECK([browsingDataStore isKindOfClass:[CRWBrowsingDataStore class]]);
DCHECK(context);
if (browsingDataStore.mode == web::CHANGING) {
++self.outOfSyncStoreCount;
return;
}
web::BrowserState* browserState = static_cast<web::BrowserState*>(context);
web::ActiveStateManager* activeStateManager =
web::BrowserState::GetActiveStateManager(browserState);
DCHECK(activeStateManager);
bool activeState = activeStateManager->IsActive();
// Check if the |browsingDataStore|'s associated ActiveStateManager's active
// state is still out of sync.
if (activeState && browsingDataStore.mode == web::INACTIVE) {
[browsingDataStore makeActiveWithCompletionHandler:nil];
} else if (!activeState && browsingDataStore.mode == web::ACTIVE) {
[browsingDataStore makeInactiveWithCompletionHandler:nil];
}
DCHECK_GE(self.outOfSyncStoreCount, 1U);
--self.outOfSyncStoreCount;
web::BrowsingDataPartitionClient* client =
web::GetBrowsingDataPartitionClient();
if (client) {
client->DidBecomeSynchronized();
}
}
@end
namespace web {
namespace {
// The global observer that tracks the number of CRWBrowsingDataStores whose
// modes are out of sync with their associated ActiveStateManager's active
// state.
CRWBrowsingDataStoreModeObserver* g_browsing_data_store_mode_observer = nil;
} // namespace
BrowsingDataPartitionImpl::BrowsingDataPartitionImpl(
BrowserState* browser_state)
: browser_state_(browser_state) {
DCHECK_CURRENTLY_ON(WebThread::UI);
DCHECK(browser_state);
active_state_manager_ = BrowserState::GetActiveStateManager(browser_state);
DCHECK(active_state_manager_);
active_state_manager_->AddObserver(this);
}
BrowsingDataPartitionImpl::~BrowsingDataPartitionImpl() {
if (active_state_manager_) {
active_state_manager_->RemoveObserver(this);
}
DCHECK_NE(CHANGING, [browsing_data_store_ mode]);
[g_browsing_data_store_mode_observer
stopObservingBrowsingDataStore:browsing_data_store_];
}
// static
bool BrowsingDataPartition::IsSynchronized() {
return [g_browsing_data_store_mode_observer outOfSyncStoreCount] == 0U;
}
CRWBrowsingDataStore* BrowsingDataPartitionImpl::GetBrowsingDataStore() {
DCHECK_CURRENTLY_ON(WebThread::UI);
if (!browsing_data_store_) {
browsing_data_store_.reset(
[[CRWBrowsingDataStore alloc] initWithBrowserState:browser_state_]);
if (!g_browsing_data_store_mode_observer) {
g_browsing_data_store_mode_observer =
[[CRWBrowsingDataStoreModeObserver alloc] init];
}
[g_browsing_data_store_mode_observer
startObservingBrowsingDataStore:browsing_data_store_
browserState:browser_state_];
}
return browsing_data_store_;
}
void BrowsingDataPartitionImpl::OnActive() {
DCHECK_CURRENTLY_ON(WebThread::UI);
[GetBrowsingDataStore() makeActiveWithCompletionHandler:nil];
}
void BrowsingDataPartitionImpl::OnInactive() {
DCHECK_CURRENTLY_ON(WebThread::UI);
[GetBrowsingDataStore() makeInactiveWithCompletionHandler:nil];
}
void BrowsingDataPartitionImpl::WillBeDestroyed() {
DCHECK_CURRENTLY_ON(WebThread::UI);
active_state_manager_->RemoveObserver(this);
active_state_manager_ = nullptr;
}
} // namespace web
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