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.wal.readonly;
  
  import com.alibaba.graphscope.groot.wal.LogEntry;
  import com.alibaba.graphscope.groot.wal.LogWriter;
  
  import org.apache.kafka.clients.producer.RecordMetadata;
  
  import java.io.IOException;
  import java.util.concurrent.Future;
  
  public class ReadOnlyLogWriter implements LogWriter {
      private long offset = 0;
  
      public ReadOnlyLogWriter() {}
  
      @Override
      public long append(LogEntry logEntry) throws IOException {
          return append(0, logEntry);
      }
  
      public long append(int partition, LogEntry logEntry) throws IOException {
          offset += 1;
          return offset;
      }
  
      public Future<RecordMetadata> appendAsync(LogEntry logEntry) throws IOException {
          return null;
      }
  
      public Future<RecordMetadata> appendAsync(int partition, LogEntry logEntry) throws IOException {
          return null;
      }
  
      @Override
      public void close() throws IOException {}
  }
  