diff --git a/src/sink.cpp b/src/sink.cpp
new file mode 100644
--- /dev/null
+++ b/src/sink.cpp
@@ -0,0 +1,70 @@
+/*
+  Copyright © 2018 Hasan Yavuz Özderya
+
+  This file is part of serialplot.
+
+  serialplot is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  serialplot is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with serialplot.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <QtGlobal>
+#include "sink.h"
+
+void Sink::connectFollower(Sink* sink)
+{
+    Q_ASSERT(!followers.contains(sink));
+
+    followers.append(sink);
+    sink->setNumChannels(_numChannels, _hasX);
+}
+
+void Sink::disconnectFollower(Sink* sink)
+{
+    Q_ASSERT(followers.contains(sink));
+
+    followers.removeOne(sink);
+}
+
+void Sink::feedIn(const SamplePack& data)
+{
+    for (auto sink : followers)
+    {
+        sink->feedIn(data);
+    }
+}
+
+void Sink::setNumChannels(unsigned nc, bool x)
+{
+    _numChannels = nc;
+    _hasX = x;
+    for (auto sink : followers)
+    {
+        sink->setNumChannels(nc, x);
+    }
+}
+
+void Sink::setSource(Source* s)
+{
+    Q_ASSERT((source == nullptr) != (s == nullptr));
+    source = s;
+}
+
+const Source* Sink::connectedSource() const
+{
+    return source;
+}
+
+Source* Sink::connectedSource()
+{
+    return const_cast<Source*>(static_cast<const Sink&>(*this).connectedSource());
+}