1 files changed, 27 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/context/IQueryRuntimeContextListener.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/context/IQueryRuntimeContextListener.java
new file mode 100644
index 00000000..7be27d56
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/context/IQueryRuntimeContextListener.java
@@ -0,0 +1,27 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2015, Bergmann Gabor, Istvan Rath and Daniel Varro
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-v20.html.
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package tools.refinery.viatra.runtime.matchers.context;
+
+import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
+
+/**
+ * Listens for changes in the runtime context.
+ * @author Bergmann Gabor
+ *
+ */
+public interface IQueryRuntimeContextListener {
+    
+    /**
+     * The given tuple was inserted into or removed from the input relation indicated by the given key.
+     * @param key the key identifying the input relation that was updated
+     * @param updateTuple the tuple that was inserted or removed
+     * @param isInsertion true if it was an insertion, false otherwise.
+     */
+    public void update(IInputKey key, Tuple updateTuple, boolean isInsertion);
+}