Introduce codemodelbackend process and library

This is a partial result of wip/clang-oop. More will follow.

This allows us to invoke the completion out of the Qt Creator process
and thus safes us as against libclang crashes.

At this point only the completion use case is supported.

Some notes on the individual components:

 src/libs/codemodelbackendipc
  * library encapsulating the inter process communication handling
  * used by the backend application and in a follow-up change by the
    creator integration

 src/libs/3rdparty/sqlite
  * version 3.8.10.2
  * dependency of codemodelbackendipc, will be used to storage indexing
    data, among others

 src/tools/codemodelbackend
  * the backend application

 tests/unit:
  * unit tests

Change-Id: I91a48e27467581a22fb760a18d8eb926008fea60
Reviewed-by: Alessandro Portale <[email protected]>
Reviewed-by: Nikolai Kosjar <[email protected]>
Reviewed-by: Marco Bubke <[email protected]>
Reviewed-by: Oswald Buddenhagen <[email protected]>

1 files changed, 100 insertions, 0 deletions

diff --git a/src/libs/sqlite/sqlitedatabaseconnection.cpp b/src/libs/sqlite/sqlitedatabaseconnection.cpp
new file mode 100644
index 00000000000..29e1d19fec7
--- /dev/null
+++ b/src/libs/sqlite/sqlitedatabaseconnection.cpp
@@ -0,0 +1,100 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://www.qt.io/licensing.  For further information
+** use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#include "sqlitedatabaseconnection.h"
+
+#include <sqlite3.h>
+
+#include <QtDebug>
+
+#ifdef Q_OS_LINUX
+#include <sys/resource.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+#endif
+
+#include "sqliteexception.h"
+#include "sqliteglobal.h"
+
+SqliteDatabaseConnection::SqliteDatabaseConnection(QObject *parent) :
+    QObject(parent)
+{
+}
+
+SqliteDatabaseConnection::~SqliteDatabaseConnection()
+{
+
+}
+
+sqlite3 *SqliteDatabaseConnection::currentSqliteDatabase()
+{
+    return SqliteDatabaseBackend::sqliteDatabaseHandle();
+}
+
+void SqliteDatabaseConnection::setDatabaseFilePath(const QString &databaseFilePath)
+{
+
+    prioritizeThreadDown();
+
+    try {
+        databaseBackend.open(databaseFilePath);
+
+        emit databaseConnectionIsOpened();
+    } catch (SqliteException &exception) {
+        exception.printWarning();
+    }
+}
+
+void SqliteDatabaseConnection::setJournalMode(JournalMode journalMode)
+{
+    try {
+        databaseBackend.setJournalMode(journalMode);
+    } catch (SqliteException &exception) {
+        exception.printWarning();
+    }
+}
+
+void SqliteDatabaseConnection::close()
+{
+    databaseBackend.closeWithoutException();
+
+    emit databaseConnectionIsClosed();
+}
+
+void SqliteDatabaseConnection::prioritizeThreadDown()
+{
+#ifdef Q_OS_LINUX
+    pid_t processId = syscall(SYS_gettid);
+    int returnCode = setpriority(PRIO_PROCESS, processId, 10);
+    if (returnCode == -1)
+        qWarning() << "cannot renice" <<  strerror(errno);
+#endif
+}