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.csp.sentinel.Entry;
  import com.alibaba.csp.sentinel.EntryType;
  import com.alibaba.csp.sentinel.ResourceTypeConstants;
  import com.alibaba.csp.sentinel.SphU;
  import com.alibaba.csp.sentinel.Tracer;
  import com.alibaba.csp.sentinel.log.RecordLog;
  import com.alibaba.csp.sentinel.slots.block.BlockException;
  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.RpcException;
  
  import static com.alibaba.dubbo.common.Constants.CONSUMER;
  
  /**
   * <p>Dubbo service consumer filter for Sentinel. Auto activated by default.</p>
   *
   * If you want to disable the consumer filter, you can configure:
   * <pre>
   * &lt;dubbo:consumer filter="-sentinel.dubbo.consumer.filter"/&gt;
   * </pre>
   *
   * @author leyou
   * @author Eric Zhao
   */
  @Activate(group = CONSUMER)
  public class SentinelDubboConsumerFilter extends AbstractDubboFilter implements Filter {
  
      public SentinelDubboConsumerFilter() {
          RecordLog.info("Sentinel Dubbo consumer filter initialized");
      }
  
      @Override
      public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
          Entry interfaceEntry = null;
          Entry methodEntry = null;
          try {
              String prefix = DubboAdapterGlobalConfig.getDubboConsumerPrefix();
              String interfaceResourceName = getInterfaceName(invoker, prefix);
              String methodResourceName = getMethodResourceName(invoker, invocation, prefix);
              interfaceEntry = SphU.entry(interfaceResourceName, ResourceTypeConstants.COMMON_RPC, EntryType.OUT);
              methodEntry = SphU.entry(methodResourceName, ResourceTypeConstants.COMMON_RPC,
                  EntryType.OUT, invocation.getArguments());
  
              Result result = invoker.invoke(invocation);
              if (result.hasException()) {
                  Throwable e = result.getException();
                  // Record common exception.
                  Tracer.traceEntry(e, interfaceEntry);
                  Tracer.traceEntry(e, methodEntry);
              }
              return result;
          } catch (BlockException e) {
              return DubboAdapterGlobalConfig.getConsumerFallback().handle(invoker, invocation, e);
          } catch (RpcException e) {
              Tracer.traceEntry(e, interfaceEntry);
              Tracer.traceEntry(e, methodEntry);
              throw e;
          } finally {
              if (methodEntry != null) {
                  methodEntry.exit(1, invocation.getArguments());
              }
              if (interfaceEntry != null) {
                  interfaceEntry.exit();
              }
          }
      }
  }
  