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
DatabaseThread()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
~DatabaseThread()50 DatabaseThread::~DatabaseThread()
51 {
52 if (!m_terminationRequested)
53 requestTermination(0);
54 m_thread.clear();
55 }
56
start()57 void DatabaseThread::start()
58 {
59 if (m_thread)
60 return;
61 m_thread = adoptPtr(blink::Platform::current()->createThread("WebCore: Database"));
62 }
63
requestTermination(DatabaseTaskSynchronizer * cleanupSync)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
terminationRequested(DatabaseTaskSynchronizer * taskSynchronizer) const73 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
cleanupDatabaseThread()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
recordDatabaseOpen(DatabaseBackend * database)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
recordDatabaseClosed(DatabaseBackend * database)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
isDatabaseOpen(DatabaseBackend * database)121 bool DatabaseThread::isDatabaseOpen(DatabaseBackend* database)
122 {
123 ASSERT(isDatabaseThread());
124 ASSERT(database);
125 return !m_terminationRequested && m_openDatabaseSet.contains(database);
126 }
127
scheduleTask(PassOwnPtr<DatabaseTask> task)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