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annotate src/org/tmatesoft/hg/internal/RevlogStreamFactory.java @ 694:7efabe0cddcf

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Speed up (a) file rename history to minimize file reads; (b) file.isCopy(int) to read metadata for few revisions at once (use pattern assumes earlier revisions are likely to be queried, too); (c) HgIgnore.isIgnored by caching matched initial fragments (to substitute more expensive Matcher.matches with cheaper HashMap.contains)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 05 Aug 2013 17:42:10 +0200
parents 99ad1e3a4e4d
children
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1 /*
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2 * Copyright (c) 2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import java.io.File;
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20 import java.lang.ref.SoftReference;
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21 import java.util.HashMap;
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22
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23 import org.tmatesoft.hg.util.Path;
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24
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25 /**
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26 * Factory to create {@link RevlogStream RevlogStreams}, cache-capable.
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public final class RevlogStreamFactory {
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32
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33 private final Internals repo;
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34 private final HashMap<Path, SoftReference<RevlogStream>> streamsCache;
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37 public RevlogStreamFactory(Internals hgRepo, boolean shallCacheRevlogs) {
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38 repo = hgRepo;
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39 if (shallCacheRevlogs) {
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40 streamsCache = new HashMap<Path, SoftReference<RevlogStream>>();
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41 } else {
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42 streamsCache = null;
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43 }
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44 }
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45
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46 /**
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47 * Creates a stream for specified file, doesn't cache stream
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48 */
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49 /*package-local*/ RevlogStream create(File f) {
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50 return new RevlogStream(repo, f);
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51 }
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52
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53 /**
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54 * Perhaps, should be separate interface, like ContentLookup
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55 * @param path - normalized file name
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56 * @return <code>null</code> if path doesn't resolve to a existing file
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57 */
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58 /*package-local*/ RevlogStream getStoreFile(Path path, boolean onlyIfExists) {
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59 final SoftReference<RevlogStream> ref = shallCacheRevlogs() ? streamsCache.get(path) : null;
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60 RevlogStream cached = ref == null ? null : ref.get();
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61 if (cached != null) {
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62 return cached;
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63 }
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64 File f = repo.getFileFromDataDir(path);
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65 if (!onlyIfExists || f.exists()) {
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66 RevlogStream s = create(f);
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67 if (shallCacheRevlogs()) {
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68 streamsCache.put(path, new SoftReference<RevlogStream>(s));
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69 }
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70 return s;
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71 }
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72 return null;
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73 }
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75 private boolean shallCacheRevlogs() {
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76 return streamsCache != null;
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77 }
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78 }