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+/*
+ 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/>.
+*/
+
+#ifndef INGEN_ENGINE_PREPROCESSCONTEXT_HPP
+#define INGEN_ENGINE_PREPROCESSCONTEXT_HPP
+
+#include <unordered_set>
+
+#include "GraphImpl.hpp"
+
+namespace Ingen {
+namespace Server {
+
+/** Event pre-processing context.
+ *
+ * \ingroup engine
+ */
+class PreProcessContext
+{
+public:
+ typedef std::unordered_set<GraphImpl*> DirtyGraphs;
+
+ /** Return true iff an atomic bundle is currently being pre-processed. */
+ bool in_bundle() const { return _in_bundle; }
+
+ /** Set/unset atomic bundle flag. */
+ void set_in_bundle(bool b) { _in_bundle = b; }
+
+ /** Return true iff graph should be compiled now (after a change).
+ *
+ * This may return false when an atomic bundle is deferring compilation, in
+ * which case the graph is flagged as dirty for later compilation.
+ */
+ bool must_compile(GraphImpl* graph) {
+ if (!graph->enabled()) {
+ return false;
+ } else if (_in_bundle) {
+ _dirty_graphs.insert(graph);
+ return false;
+ } else {
+ return true;
+ }
+ }
+
+ /** Return all graphs that require compilation after an atomic bundle. */
+ const DirtyGraphs& dirty_graphs() const { return _dirty_graphs; }
+ DirtyGraphs& dirty_graphs() { return _dirty_graphs; }
+
+private:
+ DirtyGraphs _dirty_graphs;
+ bool _in_bundle = false;
+};
+
+} // namespace Server
+} // namespace Ingen
+
+#endif // INGEN_ENGINE_PREPROCESSCONTEXT_HPP