Mercurial > jhg
changeset 186:44a34baabea0
Clone refactored into a command. HgBundle needs means to control its lifecycle, to be deleted when no longer needed
| author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
|---|---|
| date | Thu, 14 Apr 2011 00:47:04 +0200 |
| parents | c6fa4dbfc458 |
| children | b8534ac8ac67 |
| files | cmdline/org/tmatesoft/hg/console/Clone.java cmdline/org/tmatesoft/hg/console/Incoming.java src/org/tmatesoft/hg/core/HgCloneCommand.java src/org/tmatesoft/hg/repo/HgBundle.java src/org/tmatesoft/hg/repo/HgLookup.java src/org/tmatesoft/hg/repo/HgRemoteRepository.java |
| diffstat | 6 files changed, 384 insertions(+), 290 deletions(-) [+] |
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--- a/cmdline/org/tmatesoft/hg/console/Clone.java Wed Apr 13 19:55:59 2011 +0200 +++ b/cmdline/org/tmatesoft/hg/console/Clone.java Thu Apr 14 00:47:04 2011 +0200 @@ -16,308 +16,42 @@ */ package org.tmatesoft.hg.console; -import static org.tmatesoft.hg.core.Nodeid.NULL; -import static org.tmatesoft.hg.internal.RequiresFile.*; -import static org.tmatesoft.hg.internal.RequiresFile.DOTENCODE; -import static org.tmatesoft.hg.internal.RequiresFile.FNCACHE; - -import java.io.ByteArrayOutputStream; import java.io.File; -import java.io.FileOutputStream; -import java.io.IOException; -import java.net.URL; -import java.nio.ByteBuffer; -import java.util.ArrayList; -import java.util.Collections; -import java.util.LinkedList; import java.util.List; -import java.util.TreeMap; -import java.util.zip.DeflaterOutputStream; -import org.tmatesoft.hg.core.HgBadStateException; -import org.tmatesoft.hg.core.HgRepoFacade; -import org.tmatesoft.hg.core.Nodeid; -import org.tmatesoft.hg.internal.ByteArrayDataAccess; -import org.tmatesoft.hg.internal.DataAccess; -import org.tmatesoft.hg.internal.DigestHelper; -import org.tmatesoft.hg.internal.Internals; -import org.tmatesoft.hg.internal.RequiresFile; -import org.tmatesoft.hg.internal.RevlogStream; -import org.tmatesoft.hg.repo.HgBundle; +import org.tmatesoft.hg.core.HgCloneCommand; import org.tmatesoft.hg.repo.HgLookup; import org.tmatesoft.hg.repo.HgRemoteRepository; -import org.tmatesoft.hg.repo.HgBundle.GroupElement; -import org.tmatesoft.hg.repo.HgRepository; -import org.tmatesoft.hg.util.PathRewrite; /** - * WORK IN PROGRESS, DO NOT USE + * Initial clone of a repository. Creates a brand new repository and populates it from specified source. * * @author Artem Tikhomirov * @author TMate Software Ltd. */ public class Clone { -/* - * Changegroup: - * http://mercurial.selenic.com/wiki/Merge - * http://mercurial.selenic.com/wiki/WireProtocol - * - * according to latter, bundleformat data is sent through zlib - * (there's no header like HG10?? with the server output, though, - * as one may expect according to http://mercurial.selenic.com/wiki/BundleFormat) - */ + + // ran with args: svnkit c:\temp\hg\test-clone public static void main(String[] args) throws Exception { Options cmdLineOpts = Options.parse(args); - HgRepoFacade hgRepo = new HgRepoFacade(); - if (!hgRepo.init(cmdLineOpts.findRepository())) { - System.err.printf("Can't find repository in: %s\n", hgRepo.getRepository().getLocation()); + List<String> noOptsArgs = cmdLineOpts.getList(""); + if (noOptsArgs.isEmpty()) { + System.err.println("Need at least one argument pointing to remote server to pull changes from"); return; } - File destDir = new File("/temp/hg/clone-01/"); - if (destDir.exists()) { - if (!destDir.isDirectory()) { - throw new IllegalArgumentException(); - } else if (destDir.list().length > 0) { - throw new IllegalArgumentException(); - } - } else { - destDir.mkdirs(); - } - // if cloning remote repo, which can stream and no revision is specified - - // can use 'stream_out' wireproto - // - // //////// 1. from Remote.java take code that asks changegroup from remote server and write it down to temp file - // //////// 2. then, read the file with HgBundle - // //////// 3. process changelog, memorize nodeids to index - // //////// 4. process manifest, using map from step 3, collect manifest nodeids - // //////// 5. process every file, using map from 3, and consult set from step 4 to ensure repo is correct - // access source - HgRemoteRepository remoteRepo = new HgLookup().detect(new URL("https://asd/hg/")); - // discover changes - HgBundle completeChanges = remoteRepo.getChanges(Collections.singletonList(NULL)); - WriteDownMate mate = new WriteDownMate(destDir); - // instantiate new repo in the destdir - mate.initEmptyRepository(); - // pull changes - completeChanges.inspectAll(mate); - mate.complete(); - // completeChanges.unlink(); - } - - private static class WriteDownMate implements HgBundle.Inspector { - private final File hgDir; - private FileOutputStream indexFile; - private final PathRewrite storagePathHelper; - - private final TreeMap<Nodeid, Integer> changelogIndexes = new TreeMap<Nodeid, Integer>(); - private boolean collectChangelogIndexes = false; - - private int base = -1; - private long offset = 0; - private DataAccess prevRevContent; - private final DigestHelper dh = new DigestHelper(); - private final ArrayList<Nodeid> revisionSequence = new ArrayList<Nodeid>(); // last visited nodes first - - private final LinkedList<String> fncacheFiles = new LinkedList<String>(); - - public WriteDownMate(File destDir) { - hgDir = new File(destDir, ".hg"); - Internals i = new Internals(); - i.setStorageConfig(1, STORE | FNCACHE | DOTENCODE); - storagePathHelper = i.buildDataFilesHelper(); - } - - public void initEmptyRepository() throws IOException { - hgDir.mkdir(); - FileOutputStream requiresFile = new FileOutputStream(new File(hgDir, "requires")); - requiresFile.write("revlogv1\nstore\nfncache\ndotencode\n".getBytes()); - requiresFile.close(); - new File(hgDir, "store").mkdir(); // with that, hg verify says ok. - } - - public void complete() throws IOException { - FileOutputStream fncacheFile = new FileOutputStream(new File(hgDir, "store/fncache")); - for (String s : fncacheFiles) { - fncacheFile.write(s.getBytes()); - fncacheFile.write(0x0A); // http://mercurial.selenic.com/wiki/fncacheRepoFormat - } - fncacheFile.close(); - } - - public void changelogStart() { - try { - base = -1; - offset = 0; - revisionSequence.clear(); - indexFile = new FileOutputStream(new File(hgDir, "store/00changelog.i")); - collectChangelogIndexes = true; - } catch (IOException ex) { - throw new HgBadStateException(ex); - } - } - - public void changelogEnd() { - try { - if (prevRevContent != null) { - prevRevContent.done(); - prevRevContent = null; - } - collectChangelogIndexes = false; - indexFile.close(); - indexFile = null; - } catch (IOException ex) { - throw new HgBadStateException(ex); - } - } - - public void manifestStart() { - try { - base = -1; - offset = 0; - revisionSequence.clear(); - indexFile = new FileOutputStream(new File(hgDir, "store/00manifest.i")); - } catch (IOException ex) { - throw new HgBadStateException(ex); - } - } - - public void manifestEnd() { - try { - if (prevRevContent != null) { - prevRevContent.done(); - prevRevContent = null; - } - indexFile.close(); - indexFile = null; - } catch (IOException ex) { - throw new HgBadStateException(ex); - } + HgCloneCommand cmd = new HgCloneCommand(); + String remoteRepo = noOptsArgs.get(0); + HgRemoteRepository hgRemote = new HgLookup().detectRemote(remoteRepo, null); + if (hgRemote.isInvalid()) { + System.err.printf("Remote repository %s is not valid", hgRemote.getLocation()); + return; } - - public void fileStart(String name) { - try { - base = -1; - offset = 0; - revisionSequence.clear(); - fncacheFiles.add("data/" + name + ".i"); // FIXME this is pure guess, - // need to investigate more how filenames are kept in fncache - File file = new File(hgDir, storagePathHelper.rewrite(name)); - file.getParentFile().mkdirs(); - indexFile = new FileOutputStream(file); - } catch (IOException ex) { - throw new HgBadStateException(ex); - } - } - - public void fileEnd(String name) { - try { - if (prevRevContent != null) { - prevRevContent.done(); - prevRevContent = null; - } - indexFile.close(); - indexFile = null; - } catch (IOException ex) { - throw new HgBadStateException(ex); - } - } - - private int knownRevision(Nodeid p) { - if (NULL.equals(p)) { - return -1; - } else { - for (int i = revisionSequence.size() - 1; i >= 0; i--) { - if (revisionSequence.get(i).equals(p)) { - return i; - } - } - } - throw new HgBadStateException(String.format("Can't find index of %s", p.shortNotation())); + cmd.source(hgRemote); + if (noOptsArgs.size() > 1) { + cmd.destination(new File(noOptsArgs.get(1))); + } else { + cmd.destination(new File(System.getProperty("user.dir"))); } - - public boolean element(GroupElement ge) { - try { - assert indexFile != null; - boolean writeComplete = false; - Nodeid p1 = ge.firstParent(); - Nodeid p2 = ge.secondParent(); - if (NULL.equals(p1) && NULL.equals(p2) /* or forced flag, does REVIDX_PUNCHED_FLAG indicate that? */) { - prevRevContent = new ByteArrayDataAccess(new byte[0]); - writeComplete = true; - } - byte[] content = ge.apply(prevRevContent); - byte[] calculated = dh.sha1(p1, p2, content).asBinary(); - final Nodeid node = ge.node(); - if (!node.equalsTo(calculated)) { - throw new HgBadStateException("Checksum failed"); - } - final int link; - if (collectChangelogIndexes) { - changelogIndexes.put(node, revisionSequence.size()); - link = revisionSequence.size(); - } else { - Integer csRev = changelogIndexes.get(ge.cset()); - if (csRev == null) { - throw new HgBadStateException(String.format("Changelog doesn't contain revision %s", ge.cset().shortNotation())); - } - link = csRev.intValue(); - } - final int p1Rev = knownRevision(p1), p2Rev = knownRevision(p2); - DataAccess patchContent = ge.rawData(); - writeComplete = writeComplete || patchContent.length() >= (/* 3/4 of actual */content.length - (content.length >>> 2)); - if (writeComplete) { - base = revisionSequence.size(); - } - final byte[] sourceData = writeComplete ? content : patchContent.byteArray(); - final byte[] data; - ByteArrayOutputStream bos = new ByteArrayOutputStream(content.length); - DeflaterOutputStream dos = new DeflaterOutputStream(bos); - dos.write(sourceData); - dos.close(); - final byte[] compressedData = bos.toByteArray(); - dos = null; - bos = null; - final Byte dataPrefix; - if (compressedData.length >= (sourceData.length - (sourceData.length >>> 2))) { - // compression wasn't too effective, - data = sourceData; - dataPrefix = 'u'; - } else { - data = compressedData; - dataPrefix = null; - } - - ByteBuffer header = ByteBuffer.allocate(64 /* REVLOGV1_RECORD_SIZE */); - if (offset == 0) { - final int INLINEDATA = 1 << 16; - header.putInt(1 /* RevlogNG */ | INLINEDATA); - header.putInt(0); - } else { - header.putLong(offset << 16); - } - final int compressedLen = data.length + (dataPrefix == null ? 0 : 1); - header.putInt(compressedLen); - header.putInt(content.length); - header.putInt(base); - header.putInt(link); - header.putInt(p1Rev); - header.putInt(p2Rev); - header.put(node.toByteArray()); - // assume 12 bytes left are zeros - indexFile.write(header.array()); - if (dataPrefix != null) { - indexFile.write(dataPrefix.byteValue()); - } - indexFile.write(data); - // - offset += compressedLen; - revisionSequence.add(node); - prevRevContent.done(); - prevRevContent = new ByteArrayDataAccess(content); - } catch (IOException ex) { - throw new HgBadStateException(ex); - } - return true; - } + cmd.execute(); } }
--- a/cmdline/org/tmatesoft/hg/console/Incoming.java Wed Apr 13 19:55:59 2011 +0200 +++ b/cmdline/org/tmatesoft/hg/console/Incoming.java Thu Apr 14 00:47:04 2011 +0200 @@ -114,7 +114,6 @@ System.out.printf("user: %s\n", cset.user()); System.out.printf("date: %s\n", cset.dateString()); System.out.printf("comment: %s\n\n", cset.comment()); - } }); }
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/org/tmatesoft/hg/core/HgCloneCommand.java Thu Apr 14 00:47:04 2011 +0200 @@ -0,0 +1,327 @@ +/* + * Copyright (c) 2011 TMate Software Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * For information on how to redistribute this software under + * the terms of a license other than GNU General Public License + * contact TMate Software at support@hg4j.com + */ +package org.tmatesoft.hg.core; + +import static org.tmatesoft.hg.core.Nodeid.NULL; +import static org.tmatesoft.hg.internal.RequiresFile.*; + +import java.io.ByteArrayOutputStream; +import java.io.File; +import java.io.FileOutputStream; +import java.io.IOException; +import java.nio.ByteBuffer; +import java.util.ArrayList; +import java.util.Collections; +import java.util.LinkedList; +import java.util.TreeMap; +import java.util.zip.DeflaterOutputStream; + +import org.tmatesoft.hg.internal.ByteArrayDataAccess; +import org.tmatesoft.hg.internal.DataAccess; +import org.tmatesoft.hg.internal.DigestHelper; +import org.tmatesoft.hg.internal.Internals; +import org.tmatesoft.hg.repo.HgBundle; +import org.tmatesoft.hg.repo.HgBundle.GroupElement; +import org.tmatesoft.hg.repo.HgLookup; +import org.tmatesoft.hg.repo.HgRemoteRepository; +import org.tmatesoft.hg.repo.HgRepository; +import org.tmatesoft.hg.util.CancelledException; +import org.tmatesoft.hg.util.PathRewrite; + +/** + * WORK IN PROGRESS, DO NOT USE + * + * @author Artem Tikhomirov + * @author TMate Software Ltd. + */ +public class HgCloneCommand { + + private File destination; + private HgRemoteRepository srcRepo; + + public HgCloneCommand() { + } + + public HgCloneCommand destination(File folder) { + destination = folder; + return this; + } + + public HgCloneCommand source(HgRemoteRepository hgRemote) { + srcRepo = hgRemote; + return this; + } + + public HgRepository execute() throws HgException, CancelledException { + if (destination == null) { + throw new HgBadArgumentException("Destination not set", null); + } + if (srcRepo == null || srcRepo.isInvalid()) { + throw new HgBadArgumentException("Bad source repository", null); + } + if (destination.exists()) { + if (!destination.isDirectory()) { + throw new HgBadArgumentException(String.format("%s is not a directory", destination), null); + } else if (destination.list().length > 0) { + throw new HgBadArgumentException(String.format("% shall be empty", destination), null); + } + } else { + destination.mkdirs(); + } + // if cloning remote repo, which can stream and no revision is specified - + // can use 'stream_out' wireproto + // + // pull all changes from the very beginning + // XXX consult getContext() if by any chance has a bundle ready, if not, then read and register + HgBundle completeChanges = srcRepo.getChanges(Collections.singletonList(NULL)); + WriteDownMate mate = new WriteDownMate(destination); + try { + // instantiate new repo in the destdir + mate.initEmptyRepository(); + // pull changes + completeChanges.inspectAll(mate); + mate.complete(); + } catch (IOException ex) { + throw new HgException(ex); + } finally { + completeChanges.unlink(); + } + return new HgLookup().detect(destination); + } + + + // 1. process changelog, memorize nodeids to index + // 2. process manifest, using map from step 3, collect manifest nodeids + // 3. process every file, using map from 3, and consult set from step 4 to ensure repo is correct + private static class WriteDownMate implements HgBundle.Inspector { + private final File hgDir; + private FileOutputStream indexFile; + private final PathRewrite storagePathHelper; + + private final TreeMap<Nodeid, Integer> changelogIndexes = new TreeMap<Nodeid, Integer>(); + private boolean collectChangelogIndexes = false; + + private int base = -1; + private long offset = 0; + private DataAccess prevRevContent; + private final DigestHelper dh = new DigestHelper(); + private final ArrayList<Nodeid> revisionSequence = new ArrayList<Nodeid>(); // last visited nodes first + + private final LinkedList<String> fncacheFiles = new LinkedList<String>(); + + public WriteDownMate(File destDir) { + hgDir = new File(destDir, ".hg"); + Internals i = new Internals(); + i.setStorageConfig(1, STORE | FNCACHE | DOTENCODE); + storagePathHelper = i.buildDataFilesHelper(); + } + + public void initEmptyRepository() throws IOException { + hgDir.mkdir(); + FileOutputStream requiresFile = new FileOutputStream(new File(hgDir, "requires")); + requiresFile.write("revlogv1\nstore\nfncache\ndotencode\n".getBytes()); + requiresFile.close(); + new File(hgDir, "store").mkdir(); // with that, hg verify says ok. + } + + public void complete() throws IOException { + FileOutputStream fncacheFile = new FileOutputStream(new File(hgDir, "store/fncache")); + for (String s : fncacheFiles) { + fncacheFile.write(s.getBytes()); + fncacheFile.write(0x0A); // http://mercurial.selenic.com/wiki/fncacheRepoFormat + } + fncacheFile.close(); + } + + public void changelogStart() { + try { + base = -1; + offset = 0; + revisionSequence.clear(); + indexFile = new FileOutputStream(new File(hgDir, "store/00changelog.i")); + collectChangelogIndexes = true; + } catch (IOException ex) { + throw new HgBadStateException(ex); + } + } + + public void changelogEnd() { + try { + if (prevRevContent != null) { + prevRevContent.done(); + prevRevContent = null; + } + collectChangelogIndexes = false; + indexFile.close(); + indexFile = null; + } catch (IOException ex) { + throw new HgBadStateException(ex); + } + } + + public void manifestStart() { + try { + base = -1; + offset = 0; + revisionSequence.clear(); + indexFile = new FileOutputStream(new File(hgDir, "store/00manifest.i")); + } catch (IOException ex) { + throw new HgBadStateException(ex); + } + } + + public void manifestEnd() { + try { + if (prevRevContent != null) { + prevRevContent.done(); + prevRevContent = null; + } + indexFile.close(); + indexFile = null; + } catch (IOException ex) { + throw new HgBadStateException(ex); + } + } + + public void fileStart(String name) { + try { + base = -1; + offset = 0; + revisionSequence.clear(); + fncacheFiles.add("data/" + name + ".i"); // FIXME this is pure guess, + // need to investigate more how filenames are kept in fncache + File file = new File(hgDir, storagePathHelper.rewrite(name)); + file.getParentFile().mkdirs(); + indexFile = new FileOutputStream(file); + } catch (IOException ex) { + throw new HgBadStateException(ex); + } + } + + public void fileEnd(String name) { + try { + if (prevRevContent != null) { + prevRevContent.done(); + prevRevContent = null; + } + indexFile.close(); + indexFile = null; + } catch (IOException ex) { + throw new HgBadStateException(ex); + } + } + + private int knownRevision(Nodeid p) { + if (NULL.equals(p)) { + return -1; + } else { + for (int i = revisionSequence.size() - 1; i >= 0; i--) { + if (revisionSequence.get(i).equals(p)) { + return i; + } + } + } + throw new HgBadStateException(String.format("Can't find index of %s", p.shortNotation())); + } + + public boolean element(GroupElement ge) { + try { + assert indexFile != null; + boolean writeComplete = false; + Nodeid p1 = ge.firstParent(); + Nodeid p2 = ge.secondParent(); + if (NULL.equals(p1) && NULL.equals(p2) /* or forced flag, does REVIDX_PUNCHED_FLAG indicate that? */) { + prevRevContent = new ByteArrayDataAccess(new byte[0]); + writeComplete = true; + } + byte[] content = ge.apply(prevRevContent); + byte[] calculated = dh.sha1(p1, p2, content).asBinary(); + final Nodeid node = ge.node(); + if (!node.equalsTo(calculated)) { + throw new HgBadStateException("Checksum failed"); + } + final int link; + if (collectChangelogIndexes) { + changelogIndexes.put(node, revisionSequence.size()); + link = revisionSequence.size(); + } else { + Integer csRev = changelogIndexes.get(ge.cset()); + if (csRev == null) { + throw new HgBadStateException(String.format("Changelog doesn't contain revision %s", ge.cset().shortNotation())); + } + link = csRev.intValue(); + } + final int p1Rev = knownRevision(p1), p2Rev = knownRevision(p2); + DataAccess patchContent = ge.rawData(); + writeComplete = writeComplete || patchContent.length() >= (/* 3/4 of actual */content.length - (content.length >>> 2)); + if (writeComplete) { + base = revisionSequence.size(); + } + final byte[] sourceData = writeComplete ? content : patchContent.byteArray(); + final byte[] data; + ByteArrayOutputStream bos = new ByteArrayOutputStream(content.length); + DeflaterOutputStream dos = new DeflaterOutputStream(bos); + dos.write(sourceData); + dos.close(); + final byte[] compressedData = bos.toByteArray(); + dos = null; + bos = null; + final Byte dataPrefix; + if (compressedData.length >= (sourceData.length - (sourceData.length >>> 2))) { + // compression wasn't too effective, + data = sourceData; + dataPrefix = 'u'; + } else { + data = compressedData; + dataPrefix = null; + } + + ByteBuffer header = ByteBuffer.allocate(64 /* REVLOGV1_RECORD_SIZE */); + if (offset == 0) { + final int INLINEDATA = 1 << 16; + header.putInt(1 /* RevlogNG */ | INLINEDATA); + header.putInt(0); + } else { + header.putLong(offset << 16); + } + final int compressedLen = data.length + (dataPrefix == null ? 0 : 1); + header.putInt(compressedLen); + header.putInt(content.length); + header.putInt(base); + header.putInt(link); + header.putInt(p1Rev); + header.putInt(p2Rev); + header.put(node.toByteArray()); + // assume 12 bytes left are zeros + indexFile.write(header.array()); + if (dataPrefix != null) { + indexFile.write(dataPrefix.byteValue()); + } + indexFile.write(data); + // + offset += compressedLen; + revisionSequence.add(node); + prevRevContent.done(); + prevRevContent = new ByteArrayDataAccess(content); + } catch (IOException ex) { + throw new HgBadStateException(ex); + } + return true; + } + } + +}
--- a/src/org/tmatesoft/hg/repo/HgBundle.java Wed Apr 13 19:55:59 2011 +0200 +++ b/src/org/tmatesoft/hg/repo/HgBundle.java Thu Apr 14 00:47:04 2011 +0200 @@ -75,6 +75,21 @@ return da; } + private int uses = 0; + public HgBundle link() { + uses++; + return this; + } + public void unlink() { + uses--; + if (uses == 0 && bundleFile != null) { + bundleFile.deleteOnExit(); + } + } + public boolean inUse() { + return uses > 0; + } + /** * Get changes recorded in the bundle that are missing from the supplied repository. * @param hgRepo repository that shall possess base revision for this bundle
--- a/src/org/tmatesoft/hg/repo/HgLookup.java Wed Apr 13 19:55:59 2011 +0200 +++ b/src/org/tmatesoft/hg/repo/HgLookup.java Thu Apr 14 00:47:04 2011 +0200 @@ -74,7 +74,7 @@ if (location == null || !location.canRead()) { throw new IllegalArgumentException(); } - return new HgBundle(new DataAccessProvider(), location); + return new HgBundle(new DataAccessProvider(), location).link(); } /**
--- a/src/org/tmatesoft/hg/repo/HgRemoteRepository.java Wed Apr 13 19:55:59 2011 +0200 +++ b/src/org/tmatesoft/hg/repo/HgRemoteRepository.java Thu Apr 14 00:47:04 2011 +0200 @@ -65,6 +65,7 @@ private final SSLContext sslContext; private final String authInfo; private final boolean debug = Boolean.parseBoolean(System.getProperty("hg4j.remote.debug")); + private HgLookup lookupHelper; HgRemoteRepository(URL url) throws HgBadArgumentException { if (url == null) { @@ -301,8 +302,19 @@ } } - // WireProtocol wiki: roots = a list of the latest nodes on every service side changeset branch that both the client and server know about. - // perhaps, shall be named 'changegroup' + /* + * WireProtocol wiki: roots = a list of the latest nodes on every service side changeset branch that both the client and server know about. + * + * Perhaps, shall be named 'changegroup' + + * Changegroup: + * http://mercurial.selenic.com/wiki/Merge + * http://mercurial.selenic.com/wiki/WireProtocol + * + * according to latter, bundleformat data is sent through zlib + * (there's no header like HG10?? with the server output, though, + * as one may expect according to http://mercurial.selenic.com/wiki/BundleFormat) + */ public HgBundle getChanges(List<Nodeid> roots) throws HgException { StringBuilder sb = new StringBuilder(20 + roots.size() * 41); sb.append("roots="); @@ -322,13 +334,20 @@ dumpResponseHeader(u, c); } File tf = writeBundle(c.getInputStream(), false, "HG10GZ" /*didn't see any other that zip*/); - return new HgLookup().loadBundle(tf); + return getLookupHelper().loadBundle(tf); } catch (MalformedURLException ex) { throw new HgException(ex); } catch (IOException ex) { throw new HgException(ex); } } + + private HgLookup getLookupHelper() { + if (lookupHelper == null) { + lookupHelper = new HgLookup(); + } + return lookupHelper; + } private HttpURLConnection setupConnection(URLConnection urlConnection) { urlConnection.setRequestProperty("User-Agent", "hg4j/0.5.0");