content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.jstorm.daemon.nimbus.metric.flush;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.alibaba.jstorm.daemon.nimbus.metric.MetricEvent;
  import com.alibaba.jstorm.metric.TopologyMetricContext;
  
  public class FlushEvent extends MetricEvent {
      private static final Logger LOG = LoggerFactory.getLogger(FlushEvent.class);
  
      @Override
      public void run() {
          if (!context.getNimbusData().isLeader()) {
              return;
          }
  
          // if metricUploader is not fully initialized, return directly
          if (!context.isReadyToUpload()) {
              LOG.info("Context Metric Uploader isn't ready");
              return;
          }
  
          try {
              long start = System.currentTimeMillis();
              for (Map.Entry<String, TopologyMetricContext> entry : context.getTopologyMetricContexts().entrySet()) {
                  String topologyId = entry.getKey();
                  TopologyMetricContext metricContext = entry.getValue();
  
                  Map<String, Long> cachedMeta = context.getMetricCache().getMeta(topologyId);
                  if (cachedMeta == null) {
                      cachedMeta = new HashMap<>();
                  }
                  Map<String, Long> memMeta = metricContext.getMemMeta();
                  if (memMeta.size() > cachedMeta.size()) {
                      cachedMeta.putAll(memMeta);
                  }
                  context.getMetricCache().putMeta(topologyId, cachedMeta);
                  metricContext.setSyncMeta(false);
  
                  int curSize = cachedMeta.size();
                  if (curSize != metricContext.getFlushedMetaNum()) {
                      metricContext.setFlushedMetaNum(curSize);
  
                      context.getMetricUploaderDelegate().registerMetrics(context.getClusterName(), topologyId, cachedMeta);
                      LOG.info("Flush metric meta, topology:{}, total:{}, cost:{}.", topologyId, curSize,
                              System.currentTimeMillis() - start);
                  }
                  context.getStormClusterState().set_topology_metric(topologyId, curSize);
              }
  
          } catch (Exception ex) {
              LOG.error("Error", ex);
          }
      }
  }
  