1 files changed, 261 insertions, 0 deletions
diff --git a/Source/WebCore/page/GeolocationPositionCache.cpp b/Source/WebCore/page/GeolocationPositionCache.cpp
new file mode 100644
index 0000000..5a0f42d
--- /dev/null
+++ b/Source/WebCore/page/GeolocationPositionCache.cpp
@@ -0,0 +1,261 @@
+/*
+ * Copyright 2010, The Android Open Source Project
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "GeolocationPositionCache.h"
+
+#if ENABLE(GEOLOCATION)
+
+#include "CrossThreadTask.h"
+#include "Geoposition.h"
+#include "SQLValue.h"
+#include "SQLiteDatabase.h"
+#include "SQLiteFileSystem.h"
+#include "SQLiteStatement.h"
+#include "SQLiteTransaction.h"
+#include <wtf/PassOwnPtr.h>
+#include <wtf/Threading.h>
+
+using namespace WTF;
+
+namespace WebCore {
+
+static int numUsers = 0;
+
+GeolocationPositionCache* GeolocationPositionCache::instance()
+{
+    DEFINE_STATIC_LOCAL(GeolocationPositionCache*, instance, (0));
+    if (!instance)
+        instance = new GeolocationPositionCache();
+    return instance;
+}
+
+GeolocationPositionCache::GeolocationPositionCache()
+    : m_threadId(0)
+{
+}
+
+void GeolocationPositionCache::addUser()
+{
+    ASSERT(numUsers >= 0);
+    MutexLocker databaseLock(m_databaseFileMutex);
+    if (!numUsers && !m_threadId && !m_databaseFile.isNull()) {
+        startBackgroundThread();
+        MutexLocker lock(m_cachedPositionMutex);
+        if (!m_cachedPosition)
+            triggerReadFromDatabase();
+    }
+    ++numUsers;
+}
+
+void GeolocationPositionCache::removeUser()
+{
+    MutexLocker lock(m_cachedPositionMutex);
+    --numUsers;
+    ASSERT(numUsers >= 0);
+    if (!numUsers && m_cachedPosition && m_threadId)
+        triggerWriteToDatabase();
+}
+
+void GeolocationPositionCache::setDatabasePath(const String& path)
+{
+    static const char* databaseName = "CachedGeoposition.db";
+    String newFile = SQLiteFileSystem::appendDatabaseFileNameToPath(path, databaseName);
+    MutexLocker lock(m_databaseFileMutex);
+    if (m_databaseFile != newFile) {
+        m_databaseFile = newFile;
+        if (numUsers && !m_threadId) {
+            startBackgroundThread();
+            if (!m_cachedPosition)
+                triggerReadFromDatabase();
+        }
+    }
+}
+
+void GeolocationPositionCache::setCachedPosition(Geoposition* cachedPosition)
+{
+    MutexLocker lock(m_cachedPositionMutex);
+    m_cachedPosition = cachedPosition;
+}
+
+Geoposition* GeolocationPositionCache::cachedPosition()
+{
+    MutexLocker lock(m_cachedPositionMutex);
+    return m_cachedPosition.get();
+}
+
+void GeolocationPositionCache::startBackgroundThread()
+{
+    // FIXME: Consider sharing this thread with other background tasks.
+    m_threadId = createThread(threadEntryPoint, this, "WebCore: Geolocation cache");
+}
+
+void* GeolocationPositionCache::threadEntryPoint(void* object)
+{
+    static_cast<GeolocationPositionCache*>(object)->threadEntryPointImpl();
+    return 0;
+}
+
+void GeolocationPositionCache::threadEntryPointImpl()
+{
+    while (OwnPtr<ScriptExecutionContext::Task> task = m_queue.waitForMessage()) {
+        // We don't need a ScriptExecutionContext in the callback, so pass 0 here.
+        task->performTask(0);
+    }
+}
+
+void GeolocationPositionCache::triggerReadFromDatabase()
+{
+    m_queue.append(createCallbackTask(&GeolocationPositionCache::readFromDatabase, this));
+}
+
+void GeolocationPositionCache::readFromDatabase(ScriptExecutionContext*, GeolocationPositionCache* cache)
+{
+    cache->readFromDatabaseImpl();
+}
+
+void GeolocationPositionCache::readFromDatabaseImpl()
+{
+    SQLiteDatabase database;
+    {
+        MutexLocker lock(m_databaseFileMutex);
+        if (!database.open(m_databaseFile))
+            return;
+    }
+
+    // Create the table here, such that even if we've just created the
+    // DB, the commands below should succeed.
+    if (!database.executeCommand("CREATE TABLE IF NOT EXISTS CachedPosition ("
+            "latitude REAL NOT NULL, "
+            "longitude REAL NOT NULL, "
+            "altitude REAL, "
+            "accuracy REAL NOT NULL, "
+            "altitudeAccuracy REAL, "
+            "heading REAL, "
+            "speed REAL, "
+            "timestamp INTEGER NOT NULL)"))
+        return;
+
+    SQLiteStatement statement(database, "SELECT * FROM CachedPosition");
+    if (statement.prepare() != SQLResultOk)
+        return;
+
+    if (statement.step() != SQLResultRow)
+        return;
+
+    bool providesAltitude = statement.getColumnValue(2).type() != SQLValue::NullValue;
+    bool providesAltitudeAccuracy = statement.getColumnValue(4).type() != SQLValue::NullValue;
+    bool providesHeading = statement.getColumnValue(5).type() != SQLValue::NullValue;
+    bool providesSpeed = statement.getColumnValue(6).type() != SQLValue::NullValue;
+    RefPtr<Coordinates> coordinates = Coordinates::create(statement.getColumnDouble(0), // latitude
+                                                          statement.getColumnDouble(1), // longitude
+                                                          providesAltitude, statement.getColumnDouble(2), // altitude
+                                                          statement.getColumnDouble(3), // accuracy
+                                                          providesAltitudeAccuracy, statement.getColumnDouble(4), // altitudeAccuracy
+                                                          providesHeading, statement.getColumnDouble(5), // heading
+                                                          providesSpeed, statement.getColumnDouble(6)); // speed
+    DOMTimeStamp timestamp = statement.getColumnInt64(7); // timestamp
+
+    // A position may have been set since we called triggerReadFromDatabase().
+    MutexLocker lock(m_cachedPositionMutex);
+    if (m_cachedPosition)
+        return;
+    m_cachedPosition = Geoposition::create(coordinates.release(), timestamp);
+}
+
+void GeolocationPositionCache::triggerWriteToDatabase()
+{
+    m_queue.append(createCallbackTask(writeToDatabase, this));
+}
+
+void GeolocationPositionCache::writeToDatabase(ScriptExecutionContext*, GeolocationPositionCache* cache)
+{
+    cache->writeToDatabaseImpl();
+}
+
+void GeolocationPositionCache::writeToDatabaseImpl()
+{
+    SQLiteDatabase database;
+    {
+        MutexLocker lock(m_databaseFileMutex);
+        if (!database.open(m_databaseFile))
+            return;
+    }
+
+    RefPtr<Geoposition> cachedPosition;
+    {
+        MutexLocker lock(m_cachedPositionMutex);
+        if (m_cachedPosition)
+            cachedPosition = m_cachedPosition->threadSafeCopy();
+    }
+
+    SQLiteTransaction transaction(database);
+
+    if (!database.executeCommand("DELETE FROM CachedPosition"))
+        return;
+
+    SQLiteStatement statement(database, "INSERT INTO CachedPosition ("
+        "latitude, "
+        "longitude, "
+        "altitude, "
+        "accuracy, "
+        "altitudeAccuracy, "
+        "heading, "
+        "speed, "
+        "timestamp) "
+        "VALUES (?, ?, ?, ?, ?, ?, ?, ?)");
+    if (statement.prepare() != SQLResultOk)
+        return;
+
+    statement.bindDouble(1, cachedPosition->coords()->latitude());
+    statement.bindDouble(2, cachedPosition->coords()->longitude());
+    if (cachedPosition->coords()->canProvideAltitude())
+        statement.bindDouble(3, cachedPosition->coords()->altitude());
+    else
+        statement.bindNull(3);
+    statement.bindDouble(4, cachedPosition->coords()->accuracy());
+    if (cachedPosition->coords()->canProvideAltitudeAccuracy())
+        statement.bindDouble(5, cachedPosition->coords()->altitudeAccuracy());
+    else
+        statement.bindNull(5);
+    if (cachedPosition->coords()->canProvideHeading())
+        statement.bindDouble(6, cachedPosition->coords()->heading());
+    else
+        statement.bindNull(6);
+    if (cachedPosition->coords()->canProvideSpeed())
+        statement.bindDouble(7, cachedPosition->coords()->speed());
+    else
+        statement.bindNull(7);
+    statement.bindInt64(8, cachedPosition->timestamp());
+
+    if (!statement.executeCommand())
+        return;
+
+    transaction.commit();
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(GEOLOCATION)