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      1 /*
      2  * Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include "config.h"
     30 #include "modules/webdatabase/DatabaseThread.h"
     31 
     32 #include "modules/webdatabase/Database.h"
     33 #include "modules/webdatabase/DatabaseTask.h"
     34 #include "modules/webdatabase/SQLTransactionClient.h"
     35 #include "modules/webdatabase/SQLTransactionCoordinator.h"
     36 #include "platform/Logging.h"
     37 #include "public/platform/Platform.h"
     38 #include "wtf/AutodrainedPool.h"
     39 
     40 namespace WebCore {
     41 
     42 DatabaseThread::DatabaseThread()
     43     : m_transactionClient(adoptPtr(new SQLTransactionClient()))
     44     , m_transactionCoordinator(adoptPtr(new SQLTransactionCoordinator()))
     45     , m_cleanupSync(0)
     46     , m_terminationRequested(false)
     47 {
     48 }
     49 
     50 DatabaseThread::~DatabaseThread()
     51 {
     52     if (!m_terminationRequested)
     53         requestTermination(0);
     54     m_thread.clear();
     55 }
     56 
     57 void DatabaseThread::start()
     58 {
     59     if (m_thread)
     60         return;
     61     m_thread = adoptPtr(blink::Platform::current()->createThread("WebCore: Database"));
     62 }
     63 
     64 void DatabaseThread::requestTermination(DatabaseTaskSynchronizer *cleanupSync)
     65 {
     66     ASSERT(!m_terminationRequested);
     67     m_terminationRequested = true;
     68     m_cleanupSync = cleanupSync;
     69     WTF_LOG(StorageAPI, "DatabaseThread %p was asked to terminate\n", this);
     70     m_thread->postTask(new Task(WTF::bind(&DatabaseThread::cleanupDatabaseThread, this)));
     71 }
     72 
     73 bool DatabaseThread::terminationRequested(DatabaseTaskSynchronizer* taskSynchronizer) const
     74 {
     75 #ifndef NDEBUG
     76     if (taskSynchronizer)
     77         taskSynchronizer->setHasCheckedForTermination();
     78 #endif
     79 
     80     return m_terminationRequested;
     81 }
     82 
     83 void DatabaseThread::cleanupDatabaseThread()
     84 {
     85     WTF_LOG(StorageAPI, "Cleaning up DatabaseThread %p", this);
     86 
     87     // Clean up the list of all pending transactions on this database thread
     88     m_transactionCoordinator->shutdown();
     89 
     90     // Close the databases that we ran transactions on. This ensures that if any transactions are still open, they are rolled back and we don't leave the database in an
     91     // inconsistent or locked state.
     92     if (m_openDatabaseSet.size() > 0) {
     93         // As the call to close will modify the original set, we must take a copy to iterate over.
     94         DatabaseSet openSetCopy;
     95         openSetCopy.swap(m_openDatabaseSet);
     96         DatabaseSet::iterator end = openSetCopy.end();
     97         for (DatabaseSet::iterator it = openSetCopy.begin(); it != end; ++it)
     98             (*it).get()->close();
     99     }
    100 
    101     if (m_cleanupSync) // Someone wanted to know when we were done cleaning up.
    102         m_thread->postTask(new Task(WTF::bind(&DatabaseTaskSynchronizer::taskCompleted, m_cleanupSync)));
    103 }
    104 
    105 void DatabaseThread::recordDatabaseOpen(DatabaseBackend* database)
    106 {
    107     ASSERT(isDatabaseThread());
    108     ASSERT(database);
    109     ASSERT(!m_openDatabaseSet.contains(database));
    110     m_openDatabaseSet.add(database);
    111 }
    112 
    113 void DatabaseThread::recordDatabaseClosed(DatabaseBackend* database)
    114 {
    115     ASSERT(isDatabaseThread());
    116     ASSERT(database);
    117     ASSERT(m_terminationRequested || m_openDatabaseSet.contains(database));
    118     m_openDatabaseSet.remove(database);
    119 }
    120 
    121 bool DatabaseThread::isDatabaseOpen(DatabaseBackend* database)
    122 {
    123     ASSERT(isDatabaseThread());
    124     ASSERT(database);
    125     return !m_terminationRequested && m_openDatabaseSet.contains(database);
    126 }
    127 
    128 void DatabaseThread::scheduleTask(PassOwnPtr<DatabaseTask> task)
    129 {
    130     ASSERT(m_thread);
    131     ASSERT(!task->hasSynchronizer() || task->hasCheckedForTermination());
    132     // WebThread takes ownership of the task.
    133     m_thread->postTask(task.leakPtr());
    134 }
    135 
    136 } // namespace WebCore
    137