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   * 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.
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  package org.apache.cassandra.tools.nodetool;
  
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.auth.AuthCacheService;
  import org.apache.cassandra.auth.AuthTestUtils;
  import org.apache.cassandra.auth.AuthenticatedUser;
  import org.apache.cassandra.auth.IRoleManager;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.tools.ToolRunner;
  
  import static org.apache.cassandra.auth.AuthTestUtils.ROLE_A;
  import static org.apache.cassandra.auth.AuthTestUtils.ROLE_B;
  import static org.apache.cassandra.auth.AuthTestUtils.getNetworkPermissionsReadCount;
  import static org.assertj.core.api.Assertions.assertThat;
  
  public class InvalidateNetworkPermissionsCacheTest extends CQLTester
  {
      @BeforeClass
      public static void setup() throws Exception
      {
          CQLTester.requireAuthentication();
          IRoleManager roleManager = DatabaseDescriptor.getRoleManager();
          roleManager.createRole(AuthenticatedUser.SYSTEM_USER, ROLE_A, AuthTestUtils.getLoginRoleOptions());
          roleManager.createRole(AuthenticatedUser.SYSTEM_USER, ROLE_B, AuthTestUtils.getLoginRoleOptions());
          AuthCacheService.initializeAndRegisterCaches();
          requireNetwork();
          startJMXServer();
      }
  
      @Test
      public void testInvalidateSingleNetworkPermission()
      {
          AuthenticatedUser role = new AuthenticatedUser(ROLE_A.getRoleName());
  
          // cache network permission
          role.hasLocalAccess();
          long originalReadsCount = getNetworkPermissionsReadCount();
  
          // enure network permission is cached
          assertThat(role.hasLocalAccess()).isTrue();
          assertThat(originalReadsCount).isEqualTo(getNetworkPermissionsReadCount());
  
          // invalidate network permission
          ToolRunner.ToolResult tool = ToolRunner.invokeNodetool("invalidatenetworkpermissionscache", ROLE_A.getRoleName());
          tool.assertOnCleanExit();
          assertThat(tool.getStdout()).isEmpty();
  
          // ensure network permission is reloaded
          assertThat(role.hasLocalAccess()).isTrue();
          assertThat(originalReadsCount).isLessThan(getNetworkPermissionsReadCount());
      }
  
      @Test
      public void testInvalidateAllNetworkPermissions()
      {
          AuthenticatedUser roleA = new AuthenticatedUser(ROLE_A.getRoleName());
          AuthenticatedUser roleB = new AuthenticatedUser(ROLE_B.getRoleName());
  
          // cache network permissions
          roleA.hasLocalAccess();
          roleB.hasLocalAccess();
          long originalReadsCount = getNetworkPermissionsReadCount();
  
          // enure network permissions are cached
          assertThat(roleA.hasLocalAccess()).isTrue();
          assertThat(roleB.hasLocalAccess()).isTrue();
          assertThat(originalReadsCount).isEqualTo(getNetworkPermissionsReadCount());
  
          // invalidate both network permissions
          ToolRunner.ToolResult tool = ToolRunner.invokeNodetool("invalidatenetworkpermissionscache");
          tool.assertOnCleanExit();
          assertThat(tool.getStdout()).isEmpty();
  
          // ensure network permission for roleA is reloaded
          assertThat(roleA.hasLocalAccess()).isTrue();
          long readsCountAfterFirstReLoad = getNetworkPermissionsReadCount();
          assertThat(originalReadsCount).isLessThan(readsCountAfterFirstReLoad);
  
          // ensure network permission for roleB is reloaded
          assertThat(roleB.hasLocalAccess()).isTrue();
          long readsCountAfterSecondReLoad = getNetworkPermissionsReadCount();
          assertThat(readsCountAfterFirstReLoad).isLessThan(readsCountAfterSecondReLoad);
      }
  }
  