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A table format for huge analytic datasets
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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 org.apache.iceberg;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.iceberg.events.CreateSnapshotEvent;
import org.apache.iceberg.exceptions.CommitFailedException;
import org.apache.iceberg.exceptions.RuntimeIOException;
import org.apache.iceberg.io.InputFile;
import org.apache.iceberg.io.OutputFile;
import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
import org.apache.iceberg.relocated.com.google.common.collect.Iterables;
import org.apache.iceberg.relocated.com.google.common.collect.Lists;

import static org.apache.iceberg.TableProperties.SNAPSHOT_ID_INHERITANCE_ENABLED;
import static org.apache.iceberg.TableProperties.SNAPSHOT_ID_INHERITANCE_ENABLED_DEFAULT;

/**
 * {@link AppendFiles Append} implementation that adds a new manifest file for the write.
 * 
 * This implementation will attempt to commit 5 times before throwing {@link CommitFailedException}.
 */
class FastAppend extends SnapshotProducer implements AppendFiles {
  private final String tableName;
  private final TableOperations ops;
  private final PartitionSpec spec;
  private final boolean snapshotIdInheritanceEnabled;
  private final SnapshotSummary.Builder summaryBuilder = SnapshotSummary.builder();
  private final List newFiles = Lists.newArrayList();
  private final List appendManifests = Lists.newArrayList();
  private final List rewrittenAppendManifests = Lists.newArrayList();
  private ManifestFile newManifest = null;
  private boolean hasNewFiles = false;

  FastAppend(String tableName, TableOperations ops) {
    super(ops);
    this.tableName = tableName;
    this.ops = ops;
    this.spec = ops.current().spec();
    this.snapshotIdInheritanceEnabled = ops.current()
        .propertyAsBoolean(SNAPSHOT_ID_INHERITANCE_ENABLED, SNAPSHOT_ID_INHERITANCE_ENABLED_DEFAULT);
  }

  @Override
  protected AppendFiles self() {
    return this;
  }

  @Override
  public AppendFiles set(String property, String value) {
    summaryBuilder.set(property, value);
    return this;
  }

  @Override
  protected String operation() {
    return DataOperations.APPEND;
  }

  @Override
  protected Map summary() {
    return summaryBuilder.build();
  }

  @Override
  public FastAppend appendFile(DataFile file) {
    this.hasNewFiles = true;
    newFiles.add(file);
    summaryBuilder.addedFile(spec, file);
    return this;
  }

  @Override
  public FastAppend appendManifest(ManifestFile manifest) {
    Preconditions.checkArgument(!manifest.hasExistingFiles(), "Cannot append manifest with existing files");
    Preconditions.checkArgument(!manifest.hasDeletedFiles(), "Cannot append manifest with deleted files");
    Preconditions.checkArgument(
        manifest.snapshotId() == null || manifest.snapshotId() == -1,
        "Snapshot id must be assigned during commit");
    Preconditions.checkArgument(manifest.sequenceNumber() == -1,
        "Sequence number must be assigned during commit");

    if (snapshotIdInheritanceEnabled && manifest.snapshotId() == null) {
      summaryBuilder.addedManifest(manifest);
      appendManifests.add(manifest);
    } else {
      // the manifest must be rewritten with this update's snapshot ID
      ManifestFile copiedManifest = copyManifest(manifest);
      rewrittenAppendManifests.add(copiedManifest);
    }

    return this;
  }

  private ManifestFile copyManifest(ManifestFile manifest) {
    TableMetadata current = ops.current();
    InputFile toCopy = ops.io().newInputFile(manifest.path());
    OutputFile newManifestPath = newManifestOutput();
    return ManifestFiles.copyAppendManifest(
        current.formatVersion(), toCopy, current.specsById(), newManifestPath, snapshotId(), summaryBuilder);
  }

  @Override
  public List apply(TableMetadata base) {
    List newManifests = Lists.newArrayList();

    try {
      ManifestFile manifest = writeManifest();
      if (manifest != null) {
        newManifests.add(manifest);
      }
    } catch (IOException e) {
      throw new RuntimeIOException(e, "Failed to write manifest");
    }

    Iterable appendManifestsWithMetadata = Iterables.transform(
        Iterables.concat(appendManifests, rewrittenAppendManifests),
        manifest -> GenericManifestFile.copyOf(manifest).withSnapshotId(snapshotId()).build());
    Iterables.addAll(newManifests, appendManifestsWithMetadata);

    if (base.currentSnapshot() != null) {
      newManifests.addAll(base.currentSnapshot().allManifests());
    }

    return newManifests;
  }

  @Override
  public Object updateEvent() {
    long snapshotId = snapshotId();
    long sequenceNumber = ops.current().snapshot(snapshotId).sequenceNumber();
    return new CreateSnapshotEvent(
        tableName,
        operation(),
        snapshotId,
        sequenceNumber,
        summary());
  }

  @Override
  protected void cleanUncommitted(Set committed) {
    if (newManifest != null && !committed.contains(newManifest)) {
      deleteFile(newManifest.path());
    }

    // clean up only rewrittenAppendManifests as they are always owned by the table
    // don't clean up appendManifests as they are added to the manifest list and are not compacted
    for (ManifestFile manifest : rewrittenAppendManifests) {
      if (!committed.contains(manifest)) {
        deleteFile(manifest.path());
      }
    }
  }

  private ManifestFile writeManifest() throws IOException {
    if (hasNewFiles && newManifest != null) {
      deleteFile(newManifest.path());
      newManifest = null;
    }

    if (newManifest == null && newFiles.size() > 0) {
      ManifestWriter writer = newManifestWriter(spec);
      try {
        writer.addAll(newFiles);
      } finally {
        writer.close();
      }

      this.newManifest = writer.toManifestFile();
      hasNewFiles = false;
    }

    return newManifest;
  }
}