content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed 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 com.alibaba.csp.sentinel.adapter.dubbo3;
  
  import org.apache.dubbo.common.extension.Activate;
  import org.apache.dubbo.rpc.Invocation;
  import org.apache.dubbo.rpc.Invoker;
  import org.apache.dubbo.rpc.Result;
  import org.apache.dubbo.rpc.RpcException;
  import org.apache.dubbo.rpc.cluster.filter.ClusterFilter;
  import org.apache.dubbo.rpc.model.ApplicationModel;
  
  import static org.apache.dubbo.common.constants.CommonConstants.CONSUMER;
  
  /**
   * Puts current consumer's application name in the attachment of each invocation.
   *
   * @author Eric Zhao
   */
  @Activate(group = CONSUMER)
  public class DubboAppContextFilter implements ClusterFilter {
  
      private final String applicationName;
  
      public DubboAppContextFilter(ApplicationModel applicationModel) {
          this.applicationName = applicationModel.tryGetApplicationName();
      }
  
      @Override
      public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
          if (applicationName != null && !applicationName.isEmpty()) {
              invocation.setAttachment(DubboUtils.SENTINEL_DUBBO_APPLICATION_KEY, applicationName);
          }
          return invoker.invoke(invocation);
      }
  }
  