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diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/mailbox/AdaptableMailbox.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/mailbox/AdaptableMailbox.java
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+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/mailbox/AdaptableMailbox.java
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+/*******************************************************************************
+ * Copyright (c) 2010-2018, Tamas Szabo, 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.rete.network.mailbox;
+
+import tools.refinery.viatra.runtime.rete.network.communication.CommunicationTracker;
+import tools.refinery.viatra.runtime.rete.network.communication.timely.TimelyMailboxProxy;
+import tools.refinery.viatra.runtime.rete.network.mailbox.timeless.BehaviorChangingMailbox;
+
+/**
+ * An adaptable mailbox can be wrapped by another mailbox to act in behalf of that. The significance of the adaptation
+ * is that the adaptee will notify the {@link CommunicationTracker} about updates by promoting the adapter itself.
+ * Adaptable mailboxes are used by the {@link BehaviorChangingMailbox}. 
+ * 
+ * Compare this with {@link TimelyMailboxProxy}. That one also wraps another mailbox in order to 
+ * perform preprocessing on the messages sent to the original recipient. 
+ * 
+ * @author Tamas Szabo
+ * @since 2.0
+ */
+public interface AdaptableMailbox extends Mailbox {
+
+    public Mailbox getAdapter();
+
+    public void setAdapter(final Mailbox adapter);
+
+}