com.uber.hoodie.common.model.FileSlice Maven / Gradle / Ivy

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/*
 *  Copyright (c) 2017 Uber Technologies, Inc. ([email protected])
 *
 *  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
 *
 *           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.uber.hoodie.common.model;

import java.io.Serializable;
import java.util.List;
import java.util.Optional;
import java.util.TreeSet;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * Within a file group, a slice is a combination of data file written at a commit time
 * and list of log files, containing changes to the data file from that commit time
 */
public class FileSlice implements Serializable {

    /**
     * id of the slice
     */
    private String fileId;

    /**
     * Point in the timeline, at which the slice was created
     */
    private String baseCommitTime;

    /**
     * data file, with the compacted data, for this slice
     *
     */
    private HoodieDataFile dataFile;

    /**
     * List of appendable log files with real time data
     *  - Sorted with greater log version first
     *  - Always empty for copy_on_write storage.
     */
    private final TreeSet logFiles;

    public FileSlice(String baseCommitTime, String fileId) {
        this.fileId = fileId;
        this.baseCommitTime = baseCommitTime;
        this.dataFile = null;
        this.logFiles = new TreeSet<>(HoodieLogFile.getLogVersionComparator());
    }

    public void setDataFile(HoodieDataFile dataFile) {
        this.dataFile = dataFile;
    }

    public void addLogFile(HoodieLogFile logFile) {
        this.logFiles.add(logFile);
    }

    public Stream getLogFiles() {
        return logFiles.stream();
    }

    public String getBaseCommitTime() {
        return baseCommitTime;
    }

    public String getFileId() {
        return fileId;
    }

    public Optional getDataFile() {
        return Optional.ofNullable(dataFile);
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("FileSlice {");
        sb.append("baseCommitTime=").append(baseCommitTime);
        sb.append(", dataFile='").append(dataFile).append('\'');
        sb.append(", logFiles='").append(logFiles).append('\'');
        sb.append('}');
        return sb.toString();
    }
}