1 files changed, 45 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-base/src/main/java/tools/refinery/viatra/runtime/base/api/IQueryResultUpdateListener.java b/subprojects/viatra-runtime-base/src/main/java/tools/refinery/viatra/runtime/base/api/IQueryResultUpdateListener.java
new file mode 100644
index 00000000..5addfd78
--- /dev/null
+++ b/subprojects/viatra-runtime-base/src/main/java/tools/refinery/viatra/runtime/base/api/IQueryResultUpdateListener.java
@@ -0,0 +1,45 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2012, Abel Hegedus, 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.base.api;
+
+/**
+ * Listener interface for receiving notification from {@link QueryResultMultimap}
+ * 
+ * @author Abel Hegedus
+ * 
+ * @param <KeyType>
+ * @param <ValueType>
+ */
+public interface IQueryResultUpdateListener<KeyType, ValueType> {
+    /**
+     * This method is called by the query result multimap when a new key-value pair is put into the multimap
+     * 
+     * <p>
+     * Only invoked if the contents of the multimap changed!
+     * 
+     * @param key
+     *            the key of the newly inserted pair
+     * @param value
+     *            the value of the newly inserted pair
+     */
+    void notifyPut(KeyType key, ValueType value);
+
+    /**
+     * This method is called by the query result multimap when key-value pair is removed from the multimap
+     * 
+     * <p>
+     * Only invoked if the contents of the multimap changed!
+     * 
+     * @param key
+     *            the key of the removed pair
+     * @param value
+     *            the value of the removed pair
+     */
+    void notifyRemove(KeyType key, ValueType value);
+}
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