How to use addMessageHandler method of class

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2 * Licensed under the Apache License, Version 2.0 (the "License");
3 * you may not use this file except in compliance with the License.
4 * See the NOTICE file distributed with this work for additional
5 * information regarding copyright ownership.
6 * You may obtain a copy of the License at
7 *
8 *
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
19import java.util.List;
20import java.util.function.Consumer;
22public interface CanHandleMessages<T> {
23    /**
24     * Returns a list of all registered web socket messages handlers.
25     *
26     * @return The list of web socket message handlers.
27     */
28    List<Consumer<T>> getMessageHandlers();
30    /**
31     * Register a new message handler.
32     *
33     * @param handler a callback function, which accepts the received message as a parameter
34     */
35    default void addMessageHandler(Consumer<T> handler) {
36        getMessageHandlers().add(handler);
37    }
39    /**
40     * Removes existing message handlers.
41     */
42    default void removeMessageHandlers() {
43        getMessageHandlers().clear();
44    }
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