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 "platform/heap/glue/MessageLoopInterruptor.h"
38 #include "platform/heap/glue/PendingGCRunner.h"
39 #include "public/platform/Platform.h"
40
41 namespace blink {
42
DatabaseThread()43 DatabaseThread::DatabaseThread()
44 : m_transactionClient(adoptPtr(new SQLTransactionClient()))
45 , m_transactionCoordinator(adoptPtrWillBeNoop(new SQLTransactionCoordinator()))
46 , m_cleanupSync(0)
47 , m_terminationRequested(false)
48 {
49 }
50
~DatabaseThread()51 DatabaseThread::~DatabaseThread()
52 {
53 ASSERT(m_openDatabaseSet.isEmpty());
54 ASSERT(!m_thread);
55 }
56
trace(Visitor * visitor)57 void DatabaseThread::trace(Visitor* visitor)
58 {
59 #if ENABLE(OILPAN)
60 visitor->trace(m_openDatabaseSet);
61 visitor->trace(m_transactionCoordinator);
62 #endif
63 }
64
start()65 void DatabaseThread::start()
66 {
67 if (m_thread)
68 return;
69 m_thread = WebThreadSupportingGC::create("WebCore: Database");
70 m_thread->postTask(new Task(WTF::bind(&DatabaseThread::setupDatabaseThread, this)));
71 }
72
setupDatabaseThread()73 void DatabaseThread::setupDatabaseThread()
74 {
75 m_thread->attachGC();
76 }
77
terminate()78 void DatabaseThread::terminate()
79 {
80 TaskSynchronizer sync;
81 {
82 MutexLocker lock(m_terminationRequestedMutex);
83 ASSERT(!m_terminationRequested);
84 m_terminationRequested = true;
85 m_cleanupSync = &sync;
86 WTF_LOG(StorageAPI, "DatabaseThread %p was asked to terminate\n", this);
87 m_thread->postTask(new Task(WTF::bind(&DatabaseThread::cleanupDatabaseThread, this)));
88 }
89 sync.waitForTaskCompletion();
90 // The WebThread destructor blocks until all the tasks of the database
91 // thread are processed. However, it shouldn't block at all because
92 // the database thread has already finished processing the cleanup task.
93 m_thread.clear();
94 }
95
terminationRequested() const96 bool DatabaseThread::terminationRequested() const
97 {
98 MutexLocker lock(m_terminationRequestedMutex);
99 return m_terminationRequested;
100 }
101
cleanupDatabaseThread()102 void DatabaseThread::cleanupDatabaseThread()
103 {
104 WTF_LOG(StorageAPI, "Cleaning up DatabaseThread %p", this);
105
106 // Clean up the list of all pending transactions on this database thread
107 m_transactionCoordinator->shutdown();
108
109 // 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
110 // inconsistent or locked state.
111 if (m_openDatabaseSet.size() > 0) {
112 // As the call to close will modify the original set, we must take a copy to iterate over.
113 WillBeHeapHashSet<RefPtrWillBeMember<Database> > openSetCopy;
114 openSetCopy.swap(m_openDatabaseSet);
115 WillBeHeapHashSet<RefPtrWillBeMember<Database> >::iterator end = openSetCopy.end();
116 for (WillBeHeapHashSet<RefPtrWillBeMember<Database> >::iterator it = openSetCopy.begin(); it != end; ++it)
117 (*it)->close();
118 }
119
120 m_thread->postTask(new Task(WTF::bind(&DatabaseThread::cleanupDatabaseThreadCompleted, this)));
121 }
122
cleanupDatabaseThreadCompleted()123 void DatabaseThread::cleanupDatabaseThreadCompleted()
124 {
125 m_thread->detachGC();
126 if (m_cleanupSync) // Someone wanted to know when we were done cleaning up.
127 m_cleanupSync->taskCompleted();
128 }
129
recordDatabaseOpen(Database * database)130 void DatabaseThread::recordDatabaseOpen(Database* database)
131 {
132 ASSERT(isDatabaseThread());
133 ASSERT(database);
134 ASSERT(!m_openDatabaseSet.contains(database));
135 m_openDatabaseSet.add(database);
136 }
137
recordDatabaseClosed(Database * database)138 void DatabaseThread::recordDatabaseClosed(Database* database)
139 {
140 ASSERT(isDatabaseThread());
141 ASSERT(database);
142 ASSERT(m_terminationRequested || m_openDatabaseSet.contains(database));
143 m_openDatabaseSet.remove(database);
144 }
145
isDatabaseOpen(Database * database)146 bool DatabaseThread::isDatabaseOpen(Database* database)
147 {
148 ASSERT(isDatabaseThread());
149 ASSERT(database);
150 MutexLocker lock(m_terminationRequestedMutex);
151 return !m_terminationRequested && m_openDatabaseSet.contains(database);
152 }
153
scheduleTask(PassOwnPtr<DatabaseTask> task)154 void DatabaseThread::scheduleTask(PassOwnPtr<DatabaseTask> task)
155 {
156 ASSERT(m_thread);
157 ASSERT(!terminationRequested());
158 // WebThread takes ownership of the task.
159 m_thread->postTask(task.leakPtr());
160 }
161
162 } // namespace blink
163