QFuture based asynchronous Task implementation.

Change-Id: I538a2fc40b67d6d27f120afe3705065ab98f8f99
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

1 files changed, 130 insertions, 0 deletions

diff --git a/src/libs/installer/copyfiletask.cpp b/src/libs/installer/copyfiletask.cpp
new file mode 100644
index 000000000..ca31b7873
--- /dev/null
+++ b/src/libs/installer/copyfiletask.cpp
@@ -0,0 +1,130 @@
+/**************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Installer Framework.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+**************************************************************************/
+#include "copyfiletask.h"
+#include "observer.h"
+
+#include <QFileInfo>
+#include <QTemporaryFile>
+
+namespace QInstaller {
+
+CopyFileTask::CopyFileTask(const FileTaskItem &item)
+    : AbstractFileTask(item)
+{
+}
+
+CopyFileTask::CopyFileTask(const QString &source)
+    : AbstractFileTask(source)
+{
+}
+
+CopyFileTask::CopyFileTask(const QString &source, const QString &target)
+    : AbstractFileTask(source, target)
+{
+}
+
+void CopyFileTask::doTask(QFutureInterface<FileTaskResult> &fi)
+{
+    fi.reportStarted();
+    fi.setExpectedResultCount(1);
+
+    if (taskItems().isEmpty()) {
+        fi.reportException(FileTaskException(QLatin1String("Invalid task item count.")));
+        fi.reportFinished(); return;    // error
+    }
+
+    const FileTaskItem item = taskItems().first();
+    FileTaskObserver observer(QCryptographicHash::Sha1);
+
+    QFile source(item.source());
+    if (!source.open(QIODevice::ReadOnly)) {
+        fi.reportException(FileTaskException(QString::fromLatin1("Could not open source '%1' "
+            "for read. Error: %2.").arg(source.fileName(), source.errorString())));
+        fi.reportFinished(); return;    // error
+    }
+    observer.setBytesToTransfer(source.size());
+
+    QScopedPointer<QFile> file;
+    const QString target = item.target();
+    if (target.isEmpty()) {
+        QTemporaryFile *tmp = new QTemporaryFile;
+        tmp->setAutoRemove(false);
+        file.reset(tmp);
+    } else {
+        file.reset(new QFile(target));
+    }
+    if (!file->open(QIODevice::WriteOnly | QIODevice::Truncate)) {
+        fi.reportException(FileTaskException(QString::fromLatin1("Could not open target '%1' "
+            "for write. Error: %2.").arg(file->fileName(), file->errorString())));
+        fi.reportFinished(); return;    // error
+    }
+
+    QByteArray buffer(32768, Qt::Uninitialized);
+    while (!source.atEnd() && source.error() == QFile::NoError) {
+        if (fi.isCanceled())
+            break;
+        if (fi.isPaused())
+            fi.waitForResume();
+
+        const qint64 read = source.read(buffer.data(), buffer.size());
+        qint64 written = 0;
+        while (written < read) {
+            const qint64 toWrite = file->write(buffer.constData() + written, read - written);
+            if (toWrite < 0) {
+                fi.reportException(FileTaskException(QString::fromLatin1("Writing to target "
+                    "'%1' failed. Error: %2.").arg(file->fileName(), file->errorString())));
+            }
+            written += toWrite;
+        }
+
+        observer.addSample(read);
+        observer.timerEvent(NULL);
+        observer.addBytesTransfered(read);
+        observer.addCheckSumData(buffer.data(), read);
+
+        fi.setProgressValueAndText(observer.progressValue(), observer.progressText());
+    }
+
+    fi.reportResult(FileTaskResult(file->fileName(), observer.checkSum()), 0);
+    fi.reportFinished();
+}
+
+}   // namespace QInstaller