code: /*
   * Copyright (c) 2019 the Eclipse Milo Authors
   *
   * This program and the accompanying materials are made
   * available under the terms of the Eclipse Public License 2.0
   * which is available at https://www.eclipse.org/legal/epl-2.0/
   *
   * SPDX-License-Identifier: EPL-2.0
   */
  
  package org.eclipse.milo.opcua.sdk.server.api;
  
  import java.util.List;
  import java.util.Optional;
  
  import org.eclipse.milo.opcua.sdk.server.DiagnosticsContext;
  import org.eclipse.milo.opcua.sdk.server.OpcUaServer;
  import org.eclipse.milo.opcua.sdk.server.Session;
  import org.jetbrains.annotations.Nullable;
  
  public class ServiceOperationContext<T, R> extends AsyncOperationContext<List<R>> implements AccessContext {
  
      private final Session session;
      private final DiagnosticsContext<T> diagnosticsContext;
  
      public ServiceOperationContext(
          OpcUaServer server,
          @Nullable Session session
      ) {
  
          this(server, session, new DiagnosticsContext<>());
      }
  
      public ServiceOperationContext(
          OpcUaServer server,
          @Nullable Session session,
          DiagnosticsContext<T> diagnosticsContext
      ) {
  
          super(server);
  
          this.session = session;
          this.diagnosticsContext = diagnosticsContext;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public Optional<Session> getSession() {
          return Optional.ofNullable(session);
      }
  
      public DiagnosticsContext<T> getDiagnosticsContext() {
          return diagnosticsContext;
      }
  
  }
  