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.dubbo;
  
  import com.alibaba.dubbo.common.Constants;
  import com.alibaba.dubbo.common.extension.Activate;
  import com.alibaba.dubbo.rpc.Filter;
  import com.alibaba.dubbo.rpc.Invocation;
  import com.alibaba.dubbo.rpc.Invoker;
  import com.alibaba.dubbo.rpc.Result;
  import com.alibaba.dubbo.rpc.RpcContext;
  import com.alibaba.dubbo.rpc.RpcException;
  
  import static com.alibaba.dubbo.common.Constants.CONSUMER;
  
  /**
   * Puts current consumer's application name in the attachment of each invocation.
   *
   * @author Eric Zhao
   */
  @Activate(group = CONSUMER)
  public class DubboAppContextFilter implements Filter {
  
      @Override
      public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
          String application = invoker.getUrl().getParameter(Constants.APPLICATION_KEY);
          if (application != null) {
              RpcContext.getContext().setAttachment(DubboUtils.DUBBO_APPLICATION_KEY, application);
          }
          return invoker.invoke(invocation);
      }
  }
  