web/gui/src/main/java/org/onosproject/ui/impl/topo/TopoUiListener.java

/*
 * Copyright 2015 Open Networking Laboratory
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package org.onosproject.ui.impl.topo;

import org.onosproject.event.EventListener;

/**
 * Defines a listener of Topology UI Model events.
 */
public interface TopoUiListener extends EventListener<TopoUiEvent> {

    /**
     * Returns true if the listener really is listening.
     *
     * @return true if awake
     */
    boolean isAwake();
}