feat: single app with local socket

singleapplicationmanager.cpp

@@ -0,0 +1,57 @@
+#include "singleapplicationmanager.h"
+
+#include <QDataStream>
+#include <QLocalServer>
+#include <QLocalSocket>
+
+SingleApplicationManager::SingleApplicationManager(QString applicationKey, QObject *parent)
+    : QObject(parent)
+    , m_applicationKey(applicationKey)
+{
+
+}
+
+void SingleApplicationManager::on_localSocket_newConnection()
+{
+    QScopedPointer<QLocalSocket> socket(m_localServer->nextPendingConnection());
+    if (socket) {
+        socket->waitForReadyRead(500);
+        QDataStream dataStream(socket.data());
+        QVariant data;
+        dataStream.startTransaction();
+        dataStream >> data;
+        dataStream.commitTransaction();
+        emit dataReached(data);
+    }
+}
+
+void SingleApplicationManager::createSingleInstance()
+{
+    m_localServer = new QLocalServer(this);
+
+    connect(m_localServer, &QLocalServer::newConnection, this, &SingleApplicationManager::on_localSocket_newConnection);
+
+    if (!m_localServer->listen(m_applicationKey)) {
+        if (m_localServer->serverError() == QAbstractSocket::AddressInUseError) {
+            QLocalServer::removeServer(m_applicationKey);
+            m_localServer->listen(m_applicationKey);
+        }
+    }
+}
+
+bool SingleApplicationManager::checkSingleInstance(QVariant data)
+{
+    QLocalSocket socket;
+    socket.connectToServer(m_applicationKey);
+    if (socket.waitForConnected(500)) {
+        QDataStream dataStream(&socket);
+        dataStream << data;
+
+        socket.waitForBytesWritten();
+        socket.close();
+
+        return true;
+    }
+
+    return false;
+}