    001/*
    002 *  Licensed to the Apache Software Foundation (ASF) under one or more
    003 *  contributor license agreements.  See the NOTICE file distributed with
    004 *  this work for additional information regarding copyright ownership.
    005 *  The ASF licenses this file to You under the Apache License, Version 2.0
    006 *  (the "License"); you may not use this file except in compliance with
    007 *  the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 *  Unless required by applicable law or agreed to in writing, software
    012 *  distributed under the License is distributed on an "AS IS" BASIS,
    013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 *  See the License for the specific language governing permissions and
    015 *  limitations under the License.
    016 */
    017package org.apache.commons.compress.archivers.zip;
    018
    019import static org.apache.commons.compress.archivers.zip.ZipArchiveEntryRequest.createZipArchiveEntryRequest;
    020
    021import java.io.IOException;
    022import java.io.UncheckedIOException;
    023import java.util.Deque;
    024import java.util.concurrent.Callable;
    025import java.util.concurrent.ConcurrentLinkedDeque;
    026import java.util.concurrent.ExecutionException;
    027import java.util.concurrent.ExecutorService;
    028import java.util.concurrent.Executors;
    029import java.util.concurrent.Future;
    030import java.util.concurrent.TimeUnit;
    031import java.util.zip.Deflater;
    032
    033import org.apache.commons.compress.parallel.InputStreamSupplier;
    034import org.apache.commons.compress.parallel.ScatterGatherBackingStore;
    035import org.apache.commons.compress.parallel.ScatterGatherBackingStoreSupplier;
    036
    037/**
    038 * Creates a ZIP in parallel by using multiple threadlocal {@link ScatterZipOutputStream} instances.
    039 * <p>
    040 * Note that until 1.18, this class generally made no guarantees about the order of things written to the output file. Things that needed to come in a specific
    041 * order (manifests, directories) had to be handled by the client of this class, usually by writing these things to the {@link ZipArchiveOutputStream}
    042 * <em>before</em> calling {@link #writeTo writeTo} on this class.
    043 * </p>
    044 * <p>
    045 * The client can supply an {@link java.util.concurrent.ExecutorService}, but for reasons of memory model consistency, this will be shut down by this class
    046 * prior to completion.
    047 * </p>
    048 *
    049 * @since 1.10
    050 */
    051public class ParallelScatterZipCreator {
    052
    053    private final Deque<ScatterZipOutputStream> streams = new ConcurrentLinkedDeque<>();
    054    private final ExecutorService executorService;
    055    private final ScatterGatherBackingStoreSupplier backingStoreSupplier;
    056
    057    private final Deque<Future<? extends ScatterZipOutputStream>> futures = new ConcurrentLinkedDeque<>();
    058    private final long startedAt = System.currentTimeMillis();
    059    private long compressionDoneAt;
    060    private long scatterDoneAt;
    061
    062    private final int compressionLevel;
    063
    064    private final ThreadLocal<ScatterZipOutputStream> tlScatterStreams = new ThreadLocal<ScatterZipOutputStream>() {
    065        @Override
    066        protected ScatterZipOutputStream initialValue() {
    067            try {
    068                final ScatterZipOutputStream scatterStream = createDeferred(backingStoreSupplier);
    069                streams.add(scatterStream);
    070                return scatterStream;
    071            } catch (final IOException e) {
    072                throw new UncheckedIOException(e); // NOSONAR
    073            }
    074        }
    075    };
    076
    077    /**
    078     * Constructs a ParallelScatterZipCreator with default threads, which is set to the number of available processors, as defined by
    079     * {@link Runtime#availableProcessors}
    080     */
    081    public ParallelScatterZipCreator() {
    082        this(Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors()));
    083    }
    084
    085    /**
    086     * Constructs a ParallelScatterZipCreator
    087     *
    088     * @param executorService The executorService to use for parallel scheduling. For technical reasons, this will be shut down by this class.
    089     */
    090    public ParallelScatterZipCreator(final ExecutorService executorService) {
    091        this(executorService, new DefaultBackingStoreSupplier(null));
    092    }
    093
    094    /**
    095     * Constructs a ParallelScatterZipCreator
    096     *
    097     * @param executorService      The executorService to use. For technical reasons, this will be shut down by this class.
    098     * @param backingStoreSupplier The supplier of backing store which shall be used
    099     */
    100    public ParallelScatterZipCreator(final ExecutorService executorService, final ScatterGatherBackingStoreSupplier backingStoreSupplier) {
    101        this(executorService, backingStoreSupplier, Deflater.DEFAULT_COMPRESSION);
    102    }
    103
    104    /**
    105     * Constructs a ParallelScatterZipCreator
    106     *
    107     * @param executorService      The executorService to use. For technical reasons, this will be shut down by this class.
    108     * @param backingStoreSupplier The supplier of backing store which shall be used
    109     * @param compressionLevel     The compression level used in compression, this value should be -1(default level) or between 0~9.
    110     * @throws IllegalArgumentException if the compression level is illegal
    111     * @since 1.21
    112     */
    113    public ParallelScatterZipCreator(final ExecutorService executorService, final ScatterGatherBackingStoreSupplier backingStoreSupplier,
    114            final int compressionLevel) throws IllegalArgumentException {
    115        if ((compressionLevel < Deflater.NO_COMPRESSION || compressionLevel > Deflater.BEST_COMPRESSION) && compressionLevel != Deflater.DEFAULT_COMPRESSION) {
    116            throw new IllegalArgumentException("Compression level is expected between -1~9");
    117        }
    118
    119        this.backingStoreSupplier = backingStoreSupplier;
    120        this.executorService = executorService;
    121        this.compressionLevel = compressionLevel;
    122    }
    123
    124    /**
    125     * Adds an archive entry to this archive.
    126     * <p>
    127     * This method is expected to be called from a single client thread
    128     * </p>
    129     *
    130     * @param zipArchiveEntry The entry to add.
    131     * @param source          The source input stream supplier
    132     */
    133
    134    public void addArchiveEntry(final ZipArchiveEntry zipArchiveEntry, final InputStreamSupplier source) {
    135        submitStreamAwareCallable(createCallable(zipArchiveEntry, source));
    136    }
    137
    138    /**
    139     * Adds an archive entry to this archive.
    140     * <p>
    141     * This method is expected to be called from a single client thread
    142     * </p>
    143     *
    144     * @param zipArchiveEntryRequestSupplier Should supply the entry to be added.
    145     * @since 1.13
    146     */
    147    public void addArchiveEntry(final ZipArchiveEntryRequestSupplier zipArchiveEntryRequestSupplier) {
    148        submitStreamAwareCallable(createCallable(zipArchiveEntryRequestSupplier));
    149    }
    150
    151    private void closeAll() {
    152        for (final ScatterZipOutputStream scatterStream : streams) {
    153            try {
    154                scatterStream.close();
    155            } catch (final IOException ignored) {
    156                // no way to properly log this
    157            }
    158        }
    159    }
    160
    161    /**
    162     * Creates a callable that will compress the given archive entry.
    163     *
    164     * <p>
    165     * This method is expected to be called from a single client thread.
    166     * </p>
    167     *
    168     * Consider using {@link #addArchiveEntry addArchiveEntry}, which wraps this method and {@link #submitStreamAwareCallable submitStreamAwareCallable}. The
    169     * most common use case for using {@link #createCallable createCallable} and {@link #submitStreamAwareCallable submitStreamAwareCallable} from a client is
    170     * if you want to wrap the callable in something that can be prioritized by the supplied {@link ExecutorService}, for instance to process large or slow
    171     * files first. Since the creation of the {@link ExecutorService} is handled by the client, all of this is up to the client.
    172     *
    173     * @param zipArchiveEntry The entry to add.
    174     * @param source          The source input stream supplier
    175     * @return A callable that should subsequently be passed to #submitStreamAwareCallable, possibly in a wrapped/adapted from. The value of this callable is
    176     *         not used, but any exceptions happening inside the compression will be propagated through the callable.
    177     */
    178
    179    public final Callable<ScatterZipOutputStream> createCallable(final ZipArchiveEntry zipArchiveEntry, final InputStreamSupplier source) {
    180        final int method = zipArchiveEntry.getMethod();
    181        if (method == ZipMethod.UNKNOWN_CODE) {
    182            throw new IllegalArgumentException("Method must be set on zipArchiveEntry: " + zipArchiveEntry);
    183        }
    184        final ZipArchiveEntryRequest zipArchiveEntryRequest = createZipArchiveEntryRequest(zipArchiveEntry, source);
    185        return () -> {
    186            final ScatterZipOutputStream scatterStream = tlScatterStreams.get();
    187            scatterStream.addArchiveEntry(zipArchiveEntryRequest);
    188            return scatterStream;
    189        };
    190    }
    191
    192    /**
    193     * Creates a callable that will compress archive entry supplied by {@link ZipArchiveEntryRequestSupplier}.
    194     *
    195     * <p>
    196     * This method is expected to be called from a single client thread.
    197     * </p>
    198     *
    199     * The same as {@link #createCallable(ZipArchiveEntry, InputStreamSupplier)}, but the archive entry to be added is supplied by a
    200     * {@link ZipArchiveEntryRequestSupplier}.
    201     *
    202     * @see #createCallable(ZipArchiveEntry, InputStreamSupplier)
    203     *
    204     * @param zipArchiveEntryRequestSupplier Should supply the entry to be added.
    205     * @return A callable that should subsequently be passed to #submitStreamAwareCallable, possibly in a wrapped/adapted from. The value of this callable is
    206     *         not used, but any exceptions happening inside the compression will be propagated through the callable.
    207     * @since 1.13
    208     */
    209    public final Callable<ScatterZipOutputStream> createCallable(final ZipArchiveEntryRequestSupplier zipArchiveEntryRequestSupplier) {
    210        return () -> {
    211            final ScatterZipOutputStream scatterStream = tlScatterStreams.get();
    212            scatterStream.addArchiveEntry(zipArchiveEntryRequestSupplier.get());
    213            return scatterStream;
    214        };
    215    }
    216
    217    @SuppressWarnings("resource") // Caller closes
    218    private ScatterZipOutputStream createDeferred(final ScatterGatherBackingStoreSupplier scatterGatherBackingStoreSupplier) throws IOException {
    219        final ScatterGatherBackingStore bs = scatterGatherBackingStoreSupplier.get();
    220        // lifecycle is bound to the ScatterZipOutputStream returned
    221        final StreamCompressor sc = StreamCompressor.create(compressionLevel, bs); // NOSONAR
    222        return new ScatterZipOutputStream(bs, sc);
    223    }
    224
    225    /**
    226     * Gets a message describing the overall statistics of the compression run
    227     *
    228     * @return A string
    229     */
    230    public ScatterStatistics getStatisticsMessage() {
    231        return new ScatterStatistics(compressionDoneAt - startedAt, scatterDoneAt - compressionDoneAt);
    232    }
    233
    234    /**
    235     * Submits a callable for compression.
    236     *
    237     * @see ParallelScatterZipCreator#createCallable for details of if/when to use this.
    238     *
    239     * @param callable The callable to run, created by {@link #createCallable createCallable}, possibly wrapped by caller.
    240     */
    241    public final void submit(final Callable<? extends Object> callable) {
    242        submitStreamAwareCallable(() -> {
    243            callable.call();
    244            return tlScatterStreams.get();
    245        });
    246    }
    247
    248    /**
    249     * Submits a callable for compression.
    250     *
    251     * @see ParallelScatterZipCreator#createCallable for details of if/when to use this.
    252     *
    253     * @param callable The callable to run, created by {@link #createCallable createCallable}, possibly wrapped by caller.
    254     * @since 1.19
    255     */
    256    public final void submitStreamAwareCallable(final Callable<? extends ScatterZipOutputStream> callable) {
    257        futures.add(executorService.submit(callable));
    258    }
    259
    260    /**
    261     * Writes the contents this to the target {@link ZipArchiveOutputStream}.
    262     * <p>
    263     * It may be beneficial to write things like directories and manifest files to the targetStream before calling this method.
    264     * </p>
    265     * <p>
    266     * Calling this method will shut down the {@link ExecutorService} used by this class. If any of the {@link Callable}s {@link #submitStreamAwareCallable
    267     * submit}ted to this instance throws an exception, the archive can not be created properly and this method will throw an exception.
    268     * </p>
    269     *
    270     * @param targetStream The {@link ZipArchiveOutputStream} to receive the contents of the scatter streams
    271     * @throws IOException          If writing fails
    272     * @throws InterruptedException If we get interrupted
    273     * @throws ExecutionException   If something happens in the parallel execution
    274     */
    275    public void writeTo(final ZipArchiveOutputStream targetStream) throws IOException, InterruptedException, ExecutionException {
    276
    277        try {
    278            // Make sure we catch any exceptions from parallel phase
    279            try {
    280                for (final Future<?> future : futures) {
    281                    future.get();
    282                }
    283            } finally {
    284                executorService.shutdown();
    285            }
    286
    287            executorService.awaitTermination(1000 * 60L, TimeUnit.SECONDS); // == Infinity. We really *must* wait for this to complete
    288
    289            // It is important that all threads terminate before we go on, ensure happens-before relationship
    290            compressionDoneAt = System.currentTimeMillis();
    291
    292            for (final Future<? extends ScatterZipOutputStream> future : futures) {
    293                final ScatterZipOutputStream scatterStream = future.get();
    294                scatterStream.zipEntryWriter().writeNextZipEntry(targetStream);
    295            }
    296
    297            for (final ScatterZipOutputStream scatterStream : streams) {
    298                scatterStream.close();
    299            }
    300
    301            scatterDoneAt = System.currentTimeMillis();
    302        } finally {
    303            closeAll();
    304        }
    305    }
    306}