| /* |
| * 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.ListenerRegistry; |
| import org.slf4j.Logger; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| /** |
| * A listener registry that automatically prunes listeners that have not |
| * been sending heartbeat messages to assure us they are really listening. |
| */ |
| // package private |
| class ModelListenerRegistry |
| extends ListenerRegistry<TopoUiEvent, TopoUiListener> { |
| |
| private final Logger log = getLogger(getClass()); |
| |
| private final Set<TopoUiListener> zombies = new HashSet<>(); |
| |
| @Override |
| public void process(TopoUiEvent event) { |
| zombies.clear(); |
| for (TopoUiListener listener : listeners) { |
| try { |
| if (listener.isAwake()) { |
| listener.event(event); |
| } else { |
| zombies.add(listener); |
| } |
| } catch (Exception error) { |
| reportProblem(event, error); |
| } |
| } |
| |
| // clean up zombie listeners |
| for (TopoUiListener z : zombies) { |
| log.debug("Removing zombie model listener: {}", z); |
| removeListener(z); |
| } |
| } |
| |
| @Override |
| protected boolean checkForNonRegistrant() { |
| return false; |
| } |
| } |