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diff --git a/service-monitor/src/main/java/com/yahoo/vespa/service/monitor/application/DuperModelListener.java b/service-monitor/src/main/java/com/yahoo/vespa/service/monitor/application/DuperModelListener.java
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+++ b/service-monitor/src/main/java/com/yahoo/vespa/service/monitor/application/DuperModelListener.java
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+// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.vespa.service.monitor.application;
+
+import com.yahoo.config.model.api.ApplicationInfo;
+import com.yahoo.config.model.api.SuperModel;
+import com.yahoo.config.provision.ApplicationId;
+
+/**
+ * Interface for listening for changes to the {@link DuperModel}.
+ *
+ * @author hakon
+ */
+public interface DuperModelListener {
+ /**
+ * An application has been activated:
+ *
+ * <ul>
+ * <li>A synthetic application like the config server application has been added/"activated"
+ * <li>A super model application has been activated (see
+ * {@link com.yahoo.config.model.api.SuperModelListener#applicationActivated(SuperModel, ApplicationInfo)
+ * SuperModelListener}
+ * </ul>
+ */
+ void applicationActivated(ApplicationInfo application);
+
+ /** Application has been removed. */
+ void applicationRemoved(ApplicationId id);
+}