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diff --git a/src/server/PreProcessContext.hpp b/src/server/PreProcessContext.hpp
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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 Raul { class Maid; }
+
+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;
+		}
+	}
+
+	/** Compile graph and return the result if necessary.
+	 *
+	 * This may return null when an atomic bundle is deferring compilation, in
+	 * which case the graph is flagged as dirty for later compilation.
+	 */
+	MPtr<CompiledGraph> maybe_compile(Raul::Maid& maid, GraphImpl& graph) {
+		if (must_compile(graph)) {
+			return compile(maid, graph);
+		}
+		return MPtr<CompiledGraph>();
+	}
+
+	/** 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