com.netease.arctic.utils.SequenceNumberFetcher Maven / Gradle / Ivy

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/*
 * 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.netease.arctic.utils;

import com.netease.arctic.IcebergFileEntry;
import com.netease.arctic.scan.TableEntriesScan;
import com.netease.arctic.shade.org.apache.iceberg.FileContent;
import com.netease.arctic.shade.org.apache.iceberg.Table;
import com.netease.arctic.shade.org.apache.iceberg.io.CloseableIterable;
import com.netease.arctic.shade.org.apache.iceberg.relocated.com.google.common.base.Preconditions;
import com.netease.arctic.shade.org.apache.iceberg.relocated.com.google.common.collect.Maps;

import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.Map;

/**
 * Utils to get the sequence number of iceberg file.
 * If iceberg table is v1 format, will always return 0.
 */
public class SequenceNumberFetcher {
  private final Table table;
  private final long snapshotId;
  private volatile Map cached;

  public static SequenceNumberFetcher with(Table table, long snapshotId) {
    return new SequenceNumberFetcher(table, snapshotId);
  }

  public SequenceNumberFetcher(Table table, long snapshotId) {
    this.table = table;
    this.snapshotId = snapshotId;
  }

  /**
   * Get Sequence Number of file
   *
   * @param filePath path of a file
   * @return sequenceNumber of this file
   */
  public long sequenceNumberOf(String filePath) {
    Long sequence = getCached().get(filePath);
    Preconditions.checkNotNull(sequence, "can't find sequence of " + filePath);
    return sequence;
  }

  private Map getCached() {
    if (cached == null) {
      cached = Maps.newHashMap();
      TableEntriesScan manifestReader = TableEntriesScan.builder(table)
          .withAliveEntry(true)
          .includeFileContent(FileContent.DATA, FileContent.POSITION_DELETES, FileContent.EQUALITY_DELETES)
          .useSnapshot(snapshotId)
          .build();
      try (CloseableIterable entries = manifestReader.entries()) {
        entries.forEach(e -> cached.put(e.getFile().path().toString(), e.getSequenceNumber()));
      } catch (IOException e) {
        throw new UncheckedIOException("Failed to close manifest entry scan of " + table.name(), e);
      }
    }
    return cached;
  }
}