1 files changed, 192 insertions, 0 deletions
diff --git a/src/server/events/Connect.cpp b/src/server/events/Connect.cpp
new file mode 100644
index 00000000..1ce8f5a1
--- /dev/null
+++ b/src/server/events/Connect.cpp
@@ -0,0 +1,192 @@
+/*
+  This file is part of Ingen.
+  Copyright 2007-2016 David Robillard <http://drobilla.net/>
+
+  Ingen is free software: you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free
+  Software Foundation, either version 3 of the License, or any later version.
+
+  Ingen 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 Affero General Public License for details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "Connect.hpp"
+
+#include "ArcImpl.hpp"
+#include "Broadcaster.hpp"
+#include "BufferFactory.hpp"
+#include "Engine.hpp"
+#include "GraphImpl.hpp"
+#include "InputPort.hpp"
+#include "PortImpl.hpp"
+#include "PreProcessContext.hpp"
+#include "internals/BlockDelay.hpp"
+#include "types.hpp"
+
+#include "ingen/Store.hpp"
+#include "raul/Maid.hpp"
+
+#include <cassert>
+#include <mutex>
+#include <utility>
+
+namespace ingen {
+namespace server {
+namespace events {
+
+Connect::Connect(Engine&               engine,
+                 SPtr<Interface>       client,
+                 SampleCount           timestamp,
+                 const ingen::Connect& msg)
+	: Event(engine, client, msg.seq, timestamp)
+	, _msg(msg)
+	, _graph(nullptr)
+	, _head(nullptr)
+{}
+
+bool
+Connect::pre_process(PreProcessContext& ctx)
+{
+	std::lock_guard<Store::Mutex> lock(_engine.store()->mutex());
+
+	Node* tail = _engine.store()->get(_msg.tail);
+	if (!tail) {
+		return Event::pre_process_done(Status::NOT_FOUND, _msg.tail);
+	}
+
+	Node* head = _engine.store()->get(_msg.head);
+	if (!head) {
+		return Event::pre_process_done(Status::NOT_FOUND, _msg.head);
+	}
+
+	PortImpl* tail_output = dynamic_cast<PortImpl*>(tail);
+	_head                 = dynamic_cast<InputPort*>(head);
+	if (!tail_output || !_head) {
+		return Event::pre_process_done(Status::BAD_REQUEST, _msg.head);
+	}
+
+	BlockImpl* const tail_block = tail_output->parent_block();
+	BlockImpl* const head_block = _head->parent_block();
+	if (!tail_block || !head_block) {
+		return Event::pre_process_done(Status::PARENT_NOT_FOUND, _msg.head);
+	}
+
+	if (tail_block->parent() != head_block->parent()
+	    && tail_block != head_block->parent()
+	    && tail_block->parent() != head_block) {
+		return Event::pre_process_done(Status::PARENT_DIFFERS, _msg.head);
+	}
+
+	if (!ArcImpl::can_connect(tail_output, _head)) {
+		return Event::pre_process_done(Status::TYPE_MISMATCH, _msg.head);
+	}
+
+	if (tail_block->parent_graph() != head_block->parent_graph()) {
+		// Arc to a graph port from inside the graph
+		assert(tail_block->parent() == head_block || head_block->parent() == tail_block);
+		if (tail_block->parent() == head_block) {
+			_graph = dynamic_cast<GraphImpl*>(head_block);
+		} else {
+			_graph = dynamic_cast<GraphImpl*>(tail_block);
+		}
+	} else if (tail_block == head_block && dynamic_cast<GraphImpl*>(tail_block)) {
+		// Arc from a graph input to a graph output (pass through)
+		_graph = dynamic_cast<GraphImpl*>(tail_block);
+	} else {
+		// Normal arc between blocks with the same parent
+		_graph = tail_block->parent_graph();
+	}
+
+	if (_graph->has_arc(tail_output, _head)) {
+		return Event::pre_process_done(Status::EXISTS, _msg.head);
+	}
+
+	_arc = SPtr<ArcImpl>(new ArcImpl(tail_output, _head));
+
+	/* Need to be careful about graph port arcs here and adding a
+	   block's parent as a dependant/provider, or adding a graph as its own
+	   provider...
+	*/
+	if (tail_block != head_block && tail_block->parent() == head_block->parent()) {
+		// Connection is between blocks inside a graph, compile graph
+
+		// The tail block is now a dependency (provider) of the head block
+		head_block->providers().insert(tail_block);
+
+		if (!dynamic_cast<internals::BlockDelayNode*>(tail_block)) {
+			/* Arcs leaving a delay node are ignored for the purposes of
+			   compilation, since the output is from the previous cycle and
+			   does not affect execution order.  Otherwise, the head block is
+			   now a dependant of the head block. */
+			tail_block->dependants().insert(head_block);
+		}
+
+		if (ctx.must_compile(*_graph)) {
+			if (!(_compiled_graph = compile(*_engine.maid(), *_graph))) {
+				head_block->providers().erase(tail_block);
+				tail_block->dependants().erase(head_block);
+				return Event::pre_process_done(Status::COMPILATION_FAILED);
+			}
+		}
+	}
+
+	_graph->add_arc(_arc);
+	_head->increment_num_arcs();
+
+	if (!_head->is_driver_port()) {
+		BufferFactory& bufs = *_engine.buffer_factory();
+		_voices = bufs.maid().make_managed<PortImpl::Voices>(_head->poly());
+		_head->pre_get_buffers(bufs, _voices, _head->poly());
+	}
+
+	tail_output->inherit_neighbour(_head, _tail_remove, _tail_add);
+	_head->inherit_neighbour(tail_output, _head_remove, _head_add);
+
+	return Event::pre_process_done(Status::SUCCESS);
+}
+
+void
+Connect::execute(RunContext& context)
+{
+	if (_status == Status::SUCCESS) {
+		_head->add_arc(context, *_arc.get());
+		if (!_head->is_driver_port()) {
+			_head->set_voices(context, std::move(_voices));
+		}
+		_head->connect_buffers();
+		if (_compiled_graph) {
+			_graph->set_compiled_graph(std::move(_compiled_graph));
+		}
+	}
+}
+
+void
+Connect::post_process()
+{
+	Broadcaster::Transfer t(*_engine.broadcaster());
+	if (respond() == Status::SUCCESS) {
+		_engine.broadcaster()->message(_msg);
+		if (!_tail_remove.empty() || !_tail_add.empty()) {
+			_engine.broadcaster()->delta(
+				path_to_uri(_msg.tail), _tail_remove, _tail_add);
+		}
+		if (!_tail_remove.empty() || !_tail_add.empty()) {
+			_engine.broadcaster()->delta(
+				path_to_uri(_msg.tail), _tail_remove, _tail_add);
+		}
+	}
+}
+
+void
+Connect::undo(Interface& target)
+{
+	target.disconnect(_msg.tail, _msg.head);
+}
+
+} // namespace events
+} // namespace server
+} // namespace ingen