144 lines
5.3 KiB
Plaintext
144 lines
5.3 KiB
Plaintext
/*
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* Copyright (C) 2017 Apple Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#import "config.h"
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#import "WebSQLiteDatabaseTrackerClient.h"
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#if PLATFORM(IOS_FAMILY)
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#import "WebBackgroundTaskController.h"
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#import <WebCore/DatabaseTracker.h>
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#import <WebCore/SQLiteDatabaseTracker.h>
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#import <wtf/Lock.h>
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#import <wtf/MainThread.h>
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#import <wtf/NeverDestroyed.h>
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@interface WebDatabaseTransactionBackgroundTaskController : NSObject
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+ (void)startBackgroundTask;
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+ (void)endBackgroundTask;
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@end
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namespace WebCore {
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const Seconds hysteresisDuration { 2_s };
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WebSQLiteDatabaseTrackerClient& WebSQLiteDatabaseTrackerClient::sharedWebSQLiteDatabaseTrackerClient()
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{
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static NeverDestroyed<WebSQLiteDatabaseTrackerClient> client;
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return client;
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}
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WebSQLiteDatabaseTrackerClient::WebSQLiteDatabaseTrackerClient()
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: m_hysteresis([this](PAL::HysteresisState state) { hysteresisUpdated(state); }, hysteresisDuration)
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{
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ASSERT(pthread_main_np());
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}
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WebSQLiteDatabaseTrackerClient::~WebSQLiteDatabaseTrackerClient()
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{
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}
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void WebSQLiteDatabaseTrackerClient::willBeginFirstTransaction()
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{
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RunLoop::main().dispatch([this] {
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m_hysteresis.start();
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});
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}
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void WebSQLiteDatabaseTrackerClient::didFinishLastTransaction()
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{
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RunLoop::main().dispatch([this] {
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m_hysteresis.stop();
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});
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}
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void WebSQLiteDatabaseTrackerClient::hysteresisUpdated(PAL::HysteresisState state)
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{
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ASSERT(pthread_main_np());
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if (state == PAL::HysteresisState::Started)
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[WebDatabaseTransactionBackgroundTaskController startBackgroundTask];
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else
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[WebDatabaseTransactionBackgroundTaskController endBackgroundTask];
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}
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}
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static Lock transactionBackgroundTaskIdentifierLock;
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static NSUInteger transactionBackgroundTaskIdentifier WTF_GUARDED_BY_LOCK(transactionBackgroundTaskIdentifierLock);
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static void setTransactionBackgroundTaskIdentifier(NSUInteger identifier) WTF_REQUIRES_LOCK(transactionBackgroundTaskIdentifierLock)
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{
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transactionBackgroundTaskIdentifier = identifier;
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}
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static NSUInteger getTransactionBackgroundTaskIdentifier() WTF_REQUIRES_LOCK(transactionBackgroundTaskIdentifierLock)
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{
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static dispatch_once_t pred;
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dispatch_once(&pred, ^ {
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setTransactionBackgroundTaskIdentifier([[WebBackgroundTaskController sharedController] invalidBackgroundTaskIdentifier]);
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});
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return transactionBackgroundTaskIdentifier;
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}
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@implementation WebDatabaseTransactionBackgroundTaskController
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+ (void)startBackgroundTask
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{
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Locker locker { transactionBackgroundTaskIdentifierLock };
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// If there's already an existing background task going on, there's no need to start a new one.
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WebBackgroundTaskController *backgroundTaskController = [WebBackgroundTaskController sharedController];
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if (getTransactionBackgroundTaskIdentifier() != [backgroundTaskController invalidBackgroundTaskIdentifier])
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return;
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setTransactionBackgroundTaskIdentifier([backgroundTaskController startBackgroundTaskWithExpirationHandler:(^ {
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WebCore::DatabaseTracker::singleton().closeAllDatabases(WebCore::CurrentQueryBehavior::Interrupt);
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[self endBackgroundTask];
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})]);
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}
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+ (void)endBackgroundTask
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{
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Locker locker { transactionBackgroundTaskIdentifierLock };
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// It is possible that we were unable to start the background task when the first transaction began.
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// Don't try to end the task in that case.
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// It is also possible we finally finish the last transaction right when the background task expires
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// and this will end up being called twice for the same background task. transactionBackgroundTaskIdentifier
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// will be invalid for the second caller.
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WebBackgroundTaskController *backgroundTaskController = [WebBackgroundTaskController sharedController];
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if (getTransactionBackgroundTaskIdentifier() == [backgroundTaskController invalidBackgroundTaskIdentifier])
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return;
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[backgroundTaskController endBackgroundTaskWithIdentifier:getTransactionBackgroundTaskIdentifier()];
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setTransactionBackgroundTaskIdentifier([backgroundTaskController invalidBackgroundTaskIdentifier]);
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}
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@end
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#endif // PLATFORM(IOS_FAMILY)
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