content: /**
   * Copyright 2020 Alibaba Group Holding Limited.
   *
   * <p>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
   *
   * <p>http://www.apache.org/licenses/LICENSE-2.0
   *
   * <p>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.graphscope.groot.coordinator;
  
  import com.alibaba.graphscope.groot.CompletionCallback;
  import com.alibaba.graphscope.groot.common.config.CommonConfig;
  import com.alibaba.graphscope.groot.common.config.Configs;
  import com.alibaba.graphscope.groot.rpc.RoleClients;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class IngestorWriteSnapshotIdNotifier {
      private static final Logger logger =
              LoggerFactory.getLogger(IngestorWriteSnapshotIdNotifier.class);
  
      private final RoleClients<IngestorSnapshotClient> ingestorSnapshotClients;
      private final int frontendCount;
  
      public IngestorWriteSnapshotIdNotifier(
              Configs configs, RoleClients<IngestorSnapshotClient> ingestorSnapshotClients) {
          this.ingestorSnapshotClients = ingestorSnapshotClients;
          this.frontendCount = CommonConfig.FRONTEND_NODE_COUNT.get(configs);
      }
  
      public void notifyWriteSnapshotIdChanged(long si) {
          CompletionCallback<Long> callback =
                  new CompletionCallback<Long>() {
                      @Override
                      public void onCompleted(Long prev) {
                          if (prev > si) {
                              logger.error("unexpected previous SI {}, should <= {}", prev, si);
                          }
                      }
  
                      @Override
                      public void onError(Throwable t) {
                          logger.error("error in advanceIngestSnapshotId {}: {}", si, t.toString());
                      }
                  };
          for (int i = 0; i < this.frontendCount; i++) {
              try {
                  IngestorSnapshotClient client = ingestorSnapshotClients.getClient(i);
                  client.advanceIngestSnapshotId(si, callback);
              } catch (Exception e) {
                  logger.warn("update writeSnapshotId failed. realtimeWriter [{}]", i, e);
              }
          }
      }
  }
  