extras/japi/java/jvpp-core/io/fd/vpp/jvpp/core/examples/FutureApiNotificationExample.java

   1 /*
   2  * Copyright (c) 2016 Cisco and/or its affiliates.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   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  */
  16
  17 package io.fd.vpp.jvpp.core.examples;
  18
  19 import static io.fd.vpp.jvpp.core.examples.NotificationUtils.getChangeInterfaceState;
  20 import static io.fd.vpp.jvpp.core.examples.NotificationUtils.getDisableInterfaceNotificationsReq;
  21 import static io.fd.vpp.jvpp.core.examples.NotificationUtils.getEnableInterfaceNotificationsReq;
  22
  23 import io.fd.vpp.jvpp.JVppRegistry;
  24 import io.fd.vpp.jvpp.JVppRegistryImpl;
  25 import io.fd.vpp.jvpp.core.JVppCoreImpl;
  26 import io.fd.vpp.jvpp.core.future.FutureJVppCoreFacade;
  27 import io.fd.vpp.jvpp.core.callback.SwInterfaceEventCallback;
  28 import io.fd.vpp.jvpp.core.dto.SwInterfaceEvent;
  29 import io.fd.vpp.jvpp.VppCallbackException;
  30
  31 public class FutureApiNotificationExample {
  32
  33     private static void testFutureApi() throws Exception {
  34         System.out.println("Testing Java future API for notifications");
  35         try (final JVppRegistry registry = new JVppRegistryImpl("FutureApiNotificationExample");
  36              final FutureJVppCoreFacade jvppFacade = new FutureJVppCoreFacade(registry, new JVppCoreImpl());
  37              final AutoCloseable notificationListenerReg =
  38                  jvppFacade.getEventRegistry()
  39                      .registerSwInterfaceEventCallback(new SwInterfaceEventCallback() {
  40                          public void onSwInterfaceEvent(SwInterfaceEvent reply) {
  41                              System.out.printf("Received interface notification: ifc: %s%n", reply);
  42                          }
  43
  44                          public void onError (VppCallbackException ex) {
  45                              System.out.printf("Received onError exception: call=%s, context=%d, retval=%d%n",
  46                                      ex.getMethodName(), ex.getCtxId(), ex.getErrorCode());
  47                          }
  48                      })) {
  49             System.out.println("Successfully connected to VPP");
  50             jvppFacade.wantInterfaceEvents(getEnableInterfaceNotificationsReq()).toCompletableFuture().get();
  51             System.out.println("Interface events started");
  52
  53             System.out.println("Changing interface configuration");
  54             jvppFacade.swInterfaceSetFlags(getChangeInterfaceState()).toCompletableFuture().get();
  55
  56             Thread.sleep(1000);
  57
  58             jvppFacade.wantInterfaceEvents(getDisableInterfaceNotificationsReq()).toCompletableFuture().get();
  59             System.out.println("Interface events stopped");
  60             System.out.println("Disconnecting...");
  61         }
  62     }
  63
  64     public static void main(String[] args) throws Exception {
  65         testFutureApi();
  66     }
  67 }