content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.apache.kafka.server.metrics;
  
  import org.apache.kafka.common.message.PushTelemetryRequestData;
  import org.apache.kafka.common.requests.PushTelemetryRequest;
  import org.apache.kafka.server.metrics.ClientMetricsTestUtils.TestClientMetricsReceiver;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import java.net.UnknownHostException;
  import java.nio.ByteBuffer;
  import java.nio.charset.StandardCharsets;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class ClientMetricsReceiverPluginTest {
  
      private TestClientMetricsReceiver telemetryReceiver;
      private ClientMetricsReceiverPlugin clientMetricsReceiverPlugin;
  
      @BeforeEach
      public void setUp() {
          telemetryReceiver = new TestClientMetricsReceiver();
          clientMetricsReceiverPlugin = new ClientMetricsReceiverPlugin();
      }
  
      @Test
      public void testExportMetrics() throws UnknownHostException {
          assertTrue(clientMetricsReceiverPlugin.isEmpty());
  
          clientMetricsReceiverPlugin.add(telemetryReceiver);
          assertFalse(clientMetricsReceiverPlugin.isEmpty());
  
          assertEquals(0, telemetryReceiver.exportMetricsInvokedCount);
          assertTrue(telemetryReceiver.metricsData.isEmpty());
  
          byte[] metrics = "test-metrics".getBytes(StandardCharsets.UTF_8);
          clientMetricsReceiverPlugin.exportMetrics(ClientMetricsTestUtils.requestContext(),
              new PushTelemetryRequest.Builder(new PushTelemetryRequestData().setMetrics(ByteBuffer.wrap(metrics)), true).build());
  
          assertEquals(1, telemetryReceiver.exportMetricsInvokedCount);
          assertEquals(1, telemetryReceiver.metricsData.size());
          assertEquals(metrics, telemetryReceiver.metricsData.get(0).array());
      }
  }
  