content: /*
   * Copyright 1999-2019 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.metric.extension.callback;
  
  import com.alibaba.csp.sentinel.Entry;
  import com.alibaba.csp.sentinel.context.Context;
  import com.alibaba.csp.sentinel.metric.extension.AdvancedMetricExtension;
  import com.alibaba.csp.sentinel.metric.extension.MetricExtension;
  import com.alibaba.csp.sentinel.metric.extension.MetricExtensionProvider;
  import com.alibaba.csp.sentinel.slotchain.ProcessorSlotExitCallback;
  import com.alibaba.csp.sentinel.slotchain.ResourceWrapper;
  import com.alibaba.csp.sentinel.util.TimeUtil;
  
  /**
   * Metric extension exit callback.
   *
   * @author Carpenter Lee
   * @author Eric Zhao
   * @since 1.6.1
   */
  public class MetricExitCallback implements ProcessorSlotExitCallback {
  
      @Override
      public void onExit(Context context, ResourceWrapper rw, int acquireCount, Object... args) {
          Entry curEntry = context.getCurEntry();
          if (curEntry == null) {
              return;
          }
          for (MetricExtension m : MetricExtensionProvider.getMetricExtensions()) {
              if (curEntry.getBlockError() != null) {
                  continue;
              }
              String resource = rw.getName();
              Throwable ex = curEntry.getError();
              long completeTime = curEntry.getCompleteTimestamp();
              if (completeTime <= 0) {
                  completeTime = TimeUtil.currentTimeMillis();
              }
              long rt = completeTime - curEntry.getCreateTimestamp();
  
              if (m instanceof AdvancedMetricExtension) {
                  // Since 1.8.0 (as a temporary workaround for compatibility)
                  ((AdvancedMetricExtension) m).onComplete(rw, rt, acquireCount, args);
                  if (ex != null) {
                      ((AdvancedMetricExtension) m).onError(rw, ex, acquireCount, args);
                  }
              } else {
                  m.addRt(resource, rt, args);
                  m.addSuccess(resource, acquireCount, args);
                  m.decreaseThreadNum(resource, args);
                  if (null != ex) {
                      m.addException(resource, acquireCount, ex);
                  }
              }
          }
      }
  }
  