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annotate design.txt @ 91:c2ce1cfaeb9e

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 27 Jan 2011 06:06:42 +0100
parents 08754fce5778
children d55d4eedfc57
rev   line source
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a3576694a4d1 Repository detection from local/specified directory
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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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
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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
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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
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8 HgDataFile.history() or Changelog.history(file)?
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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
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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
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17
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18 Revlog
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aa1912c70b36 Fix offset issue for inline revlogs. Commandline processing.
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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.
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20
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603806cd2dc6 Status of local working dir against non-tip base revision
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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
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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.
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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>
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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>
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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>
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29 + dirstate.mtime
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1b26247d7367 Calculate result length of the patch operarion, when unknown
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 41
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30 +calculate sha1 digest for file to see I can deal with nodeid. +Do this correctly (smaller nodeid - first)
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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
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33 +DataAccess - implement memory mapped files,
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26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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34 +Changeset to get index (local revision number)
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613c936d74e4 Log operation to output mode detailed (added, removed) files
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parents: 55
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35 +RevisionWalker (on manifest) and WorkingCopyWalker (io.File) talking to ? and/or dirstate (StatusCollector and WCSC)
613c936d74e4 Log operation to output mode detailed (added, removed) files
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 55
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36 +RevlogStream - Inflater. Perhaps, InflaterStream instead? branch:wrap-data-access
613c936d74e4 Log operation to output mode detailed (added, removed) files
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37 +repo.status - use same collector class twice, difference as external code. add external walker that keeps collected maps and use it in Log operation to give files+,files-
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c25c5c348d1b Skip metadata in the beginning of a file content. Parse metadata, recognize copies/renames
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38 + strip \1\n metadata out from RevlogStream
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08754fce5778 updated design questions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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39 + hash/digest long names for fncache
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613c936d74e4 Log operation to output mode detailed (added, removed) files
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40
613c936d74e4 Log operation to output mode detailed (added, removed) files
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41 delta merge
613c936d74e4 Log operation to output mode detailed (added, removed) files
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42 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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858d1b2458cb Check integrity for bundle changelog. Sort nodeids when calculating hash
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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43
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c25c5c348d1b Skip metadata in the beginning of a file content. Parse metadata, recognize copies/renames
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44 Strip off metadata from beg of the stream - DataAccess (with rebase/moveBaseOffset(int)) would be handy
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45
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02ee376bee79 status operation against current working directory
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46 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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613c936d74e4 Log operation to output mode detailed (added, removed) files
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47 -> recently introduced FileWalker may perhaps help solving this (if starts walking from selected folder) for status op against WorkingDir?
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48
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08754fce5778 updated design questions
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49 ? Can I use fncache (names from it - perhaps, would help for Mac issues Alex mentioned)
08754fce5778 updated design questions
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50 ? Does fncache lists both .i and .d (iow, is it true hashed <long name>.d is different from hashed <long name>.i)
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865bf07f381f Basic hgignore handling
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52 ??? encodings of fncache, .hgignore, dirstate
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254078595653 Print manifest nodeid
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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53 ??? http://mercurial.selenic.com/wiki/Manifest says "Multiple changesets may refer to the same manifest revision". To me, each changeset
254078595653 Print manifest nodeid
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54 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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19e9e220bf68 Convenient commands constitute hi-level API. org.tmatesoft namespace, GPL2 statement
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56 ? hg status, compare revision and local file with kw expansion and eol extension
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57 ? subrepos in log, status (-S) and manifest commands
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58
19e9e220bf68 Convenient commands constitute hi-level API. org.tmatesoft namespace, GPL2 statement
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59 Commands to get CommandContext where they may share various caches (e.g. StatusCollector)
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61 >>>> Effective file read/data access
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62 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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63 ReadOperation gets buffer (of whatever size, as decided by FS impl), parses it and then reports if needs more data.
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64 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
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65 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
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66 Scheduling multiple operations (in future, to deal with writes - single queue for FS operations - no locks?)
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68 WRITE: Need to register instances that cache files (e.g. dirstate or .hgignore) to FS notifier, so that cache may get cleared if the file changes (i.e. WriteOperation touches it).
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70 File access:
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71 * 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
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72 * 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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74 <<<<<
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71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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76 Tests:
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fac8e7fcc8b0 Simple test framework - capable of parsing Hg cmdline output to compare with Java result
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77 DataAccess - readBytes(length > memBufferSize, length*2 > memBufferSize) - to check impl is capable to read huge chunks of data, regardless of own buffer size
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fac8e7fcc8b0 Simple test framework - capable of parsing Hg cmdline output to compare with Java result
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79 ExecHelper('cmd', OutputParser()).run(). StatusOutputParser, LogOutputParser extends OutputParser. construct java result similar to that of cmd, compare results