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annotate design.txt @ 42:92c3d0920d58

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Real integrity check, with exception. DigestHelper refactored to accomodate new needs
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 14 Jan 2011 04:29:03 +0100
parents 858d1b2458cb
children 1b26247d7367
rev   line source
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a3576694a4d1 Repository detection from local/specified directory
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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1 FileStructureWalker (pass HgFile, HgFolder to callable; which can ask for VCS data from any file)
a3576694a4d1 Repository detection from local/specified directory
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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2 External uses: user browses files, selects one and asks for its history
a3576694a4d1 Repository detection from local/specified directory
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3 Params: tip/revision;
a3576694a4d1 Repository detection from local/specified directory
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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4 Implementation: manifest
a3576694a4d1 Repository detection from local/specified directory
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5
a3576694a4d1 Repository detection from local/specified directory
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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6 Log --rev
a3576694a4d1 Repository detection from local/specified directory
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7 Log <file>
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08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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8 HgDataFile.history() or Changelog.history(file)?
08db726a0fb7 Shaping out low-level Hg structures
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08db726a0fb7 Shaping out low-level Hg structures
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08db726a0fb7 Shaping out low-level Hg structures
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11 Changelog.all() to return list with placeholder, not-parsed elements (i.e. read only compressedLen field and skip to next record), so that
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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12 total number of elements in the list is correct
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a3576694a4d1 Repository detection from local/specified directory
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a3576694a4d1 Repository detection from local/specified directory
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14 hg cat
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15 Implementation: logic to find file by name in the repository is the same with Log and other commands
08db726a0fb7 Shaping out low-level Hg structures
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16
08db726a0fb7 Shaping out low-level Hg structures
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17
08db726a0fb7 Shaping out low-level Hg structures
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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18 Revlog
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aa1912c70b36 Fix offset issue for inline revlogs. Commandline processing.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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19 What happens when big entry is added to a file - when it detects it can't longer fit into .i and needs .d? Inline flag and .i format changes?
aa1912c70b36 Fix offset issue for inline revlogs. Commandline processing.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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20
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603806cd2dc6 Status of local working dir against non-tip base revision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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21 What's hg natural way to see nodeids of specific files (i.e. when I do 'hg --debug manifest -r 11' and see nodeid of some file, and
603806cd2dc6 Status of local working dir against non-tip base revision
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22 then would like to see what changeset this file came from)?
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aa1912c70b36 Fix offset issue for inline revlogs. Commandline processing.
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23
aa1912c70b36 Fix offset issue for inline revlogs. Commandline processing.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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24 ----------
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5abe5af181bd Ant script to build commands and run sample
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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25 + support patch from baseRev + few deltas (although done in a way patches are applied one by one instead of accumulated)
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aa1912c70b36 Fix offset issue for inline revlogs. Commandline processing.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
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26 + command-line samples (-R, filenames) (Log & Cat) to show on any repo
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5abe5af181bd Ant script to build commands and run sample
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 5
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27 +buildfile + run samples
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d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
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28 *input stream impl + lifecycle. Step forward with FileChannel and ByteBuffer, although questionable accomplishment (looks bit complicated, cumbersome)
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442dc6ee647b Show correct time
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 11
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29 + dirstate.mtime
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02ee376bee79 status operation against current working directory
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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30 +calculate sha1 digest for file to see I can deal with nodeid
02ee376bee79 status operation against current working directory
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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31 *.hgignored processing
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da8ccbfae64d Reflect Nodeid's array is exactly 20
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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32 +Nodeid to keep 20 bytes always, Revlog.Inspector to get nodeid array of meaningful data exact size (nor heading 00 bytes, nor 12 extra bytes from the spec)
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71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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33 +DataAccess - implement memory mapped files,
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aa1912c70b36 Fix offset issue for inline revlogs. Commandline processing.
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34
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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35 DataAccess - collect debug info (buffer misses, file size/total read operations) to find out better strategy to buffer size detection. Compare performance.
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aa1912c70b36 Fix offset issue for inline revlogs. Commandline processing.
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 2
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36 delta merge
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5abe5af181bd Ant script to build commands and run sample
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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37 Changeset to get index (local revision number)
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442dc6ee647b Show correct time
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 11
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38 RevisionWalker (on manifest) and WorkingCopyWalker (io.File) talking to ? and/or dirstate
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565ce0835674 TODO added, to try stream for unzip in revlog
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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39 RevlogStream - Inflater. Perhaps, InflaterStream instead?
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858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 33
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40 Implement use of fncache (use names from it - perhaps, would help for Mac issues Alex mentioned) along with 'digest'-ing long file names
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 33
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41
858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 33
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42
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11cfabe692b3 Status operation for two repository revisions (no local dir involved)
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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43
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02ee376bee79 status operation against current working directory
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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44 Status operation from GUI - guess, usually on a file/subfolder, hence API should allow for starting path (unlike cmdline, seems useless to implement include/exclide patterns - GUI users hardly enter them, ever)
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45
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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46
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865bf07f381f Basic hgignore handling
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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47 ??? encodings of fncache, .hgignore, dirstate
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254078595653 Print manifest nodeid
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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48 ??? http://mercurial.selenic.com/wiki/Manifest says "Multiple changesets may refer to the same manifest revision". To me, each changeset
254078595653 Print manifest nodeid
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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49 changes repository, hence manifest should update nodeids of the files it lists, effectively creating new manifest revision.
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865bf07f381f Basic hgignore handling
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50
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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51 >>>> Effective file read/data access
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
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52 ReadOperation, Revlog does: repo.getFileSystem().run(this.file, new ReadOperation(), long start=0, long end = -1)
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
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53 ReadOperation gets buffer (of whatever size, as decided by FS impl), parses it and then reports if needs more data.
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
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54 This helps to ensure streams are closed after reading, allows caching (if the same file (or LRU) is read few times in sequence)
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
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55 and allows buffer management (i.e. reuse. Single buffer for all reads).
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
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56 Scheduling multiple operations (in future, to deal with writes - single queue for FS operations - no locks?)
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
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parents: 6
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d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
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58 File access:
d6d2a630f4a6 Access to underlaying file data wrapped into own Access object, implemented with FileChannel and ByteBuffer
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 6
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59 * NIO and mapped files - should be fast. Although seems to give less control on mem usage.
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e929cecae4e1 Refactor to move revlog content to base class
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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60 * Regular InputStreams and chunked stream on top - allocate List<byte[]>, each (but last) chunk of fixed size (depending on initial file size)
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61
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71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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62 <<<<<
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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63
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parents: 25
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64 Tests:
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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65 DataAccess - readBytes(length > memBufferSize, length*2 > memBufferSize) - to check impl is capable to read huge chunks of data, regardless of own buffer size