我編寫了以下類來創建 JGroup 集群：public class TestClient extends ReceiverAdapter {JChannel channel;private void start() throws Exception {    channel=new JChannel().setReceiver(this);    channel.connect("ChatCluster");    eventLoop();    channel.close();}private void eventLoop() {    while(true) {    }}public void viewAccepted(View new_view) {    System.out.println("** view: " + new_view);    System.out.println("Get Coord"+new_view.getCoord());    System.out.println(new_view.getMembers());}public void receive(Message msg) {    System.out.println(msg.getSrc() + ": " + msg.getObject());}public void getState(OutputStream output) throws Exception {}public void setState(InputStream input) throws Exception {}}ReceiverAdapter 是一個 Jgroups 定義的類：public class ReceiverAdapter implements Receiver {public ReceiverAdapter() {}public void receive(Message msg) {}public void receive(MessageBatch batch) {    Iterator var2 = batch.iterator();    while(var2.hasNext()) {        Message msg = (Message)var2.next();        try {            this.receive(msg);        } catch (Throwable var5) {            ;        }    }}public void getState(OutputStream output) throws Exception {}public void setState(InputStream input) throws Exception {}public void viewAccepted(View view) {}public void suspect(Address mbr) {}public void block() {}public void unblock() {}}我的問題是如何在視圖更改或發送/接收消息時調用 ReceiverAdapter 類中的這些方法，因為我不需要顯式調用這些方法。JGroups 是否實現了某種事件偵聽器？