Class DfsPackCompactor
- java.lang.Object
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- org.eclipse.jgit.internal.storage.dfs.DfsPackCompactor
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public class DfsPackCompactor extends Object
Combine several pack files into one pack.The compactor combines several pack files together by including all objects contained in each pack file into the same output pack. If an object appears multiple times, it is only included once in the result. Because the new pack is constructed by enumerating the indexes of the source packs, it is quicker than doing a full repack of the repository, however the result is not nearly as space efficient as new delta compression is disabled.
This method is suitable for quickly combining several packs together after receiving a number of small fetch or push operations into a repository, allowing the system to maintain reasonable read performance without expending a lot of time repacking the entire repository.
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Constructor Summary
Constructors Constructor Description DfsPackCompactor(DfsRepository repository)
Initialize a pack compactor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description DfsPackCompactor
add(DfsPackFile pack)
Add a pack to be compacted.DfsPackCompactor
add(DfsReftable table)
Add a reftable to be compacted.DfsPackCompactor
autoAdd()
Automatically select pack and reftables to be included, and add them.void
compact(ProgressMonitor pm)
Compact the pack files together.DfsPackCompactor
exclude(DfsPackFile pack)
Exclude objects from the compacted pack.DfsPackCompactor
exclude(ObjectIdSet set)
Exclude objects from the compacted pack.List<DfsPackDescription>
getNewPacks()
Get new packs created by this compaction.List<PackStatistics>
getNewPackStatistics()
Get statistics corresponding to thegetNewPacks()
.Collection<DfsPackDescription>
getSourcePacks()
Get all of the source packs that fed into this compaction.DfsPackCompactor
setReftableConfig(ReftableConfig cfg)
Set configuration to write a reftable.
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Constructor Detail
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DfsPackCompactor
public DfsPackCompactor(DfsRepository repository)
Initialize a pack compactor.- Parameters:
repository
- repository objects to be packed will be read from.
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Method Detail
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setReftableConfig
public DfsPackCompactor setReftableConfig(ReftableConfig cfg)
Set configuration to write a reftable.- Parameters:
cfg
- configuration to write a reftable. Reftable compacting is disabled (default) whencfg
isnull
.- Returns:
this
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add
public DfsPackCompactor add(DfsPackFile pack)
Add a pack to be compacted.All of the objects in this pack will be copied into the resulting pack. The resulting pack will order objects according to the source pack's own description ordering (which is based on creation date), and then by the order the objects appear in the source pack.
- Parameters:
pack
- a pack to combine into the resulting pack.- Returns:
this
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add
public DfsPackCompactor add(DfsReftable table)
Add a reftable to be compacted.- Parameters:
table
- a reftable to combine.- Returns:
this
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autoAdd
public DfsPackCompactor autoAdd() throws IOException
Automatically select pack and reftables to be included, and add them.Packs are selected based on size, smaller packs get included while bigger ones are omitted.
- Returns:
this
- Throws:
IOException
- existing packs cannot be read.
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exclude
public DfsPackCompactor exclude(ObjectIdSet set)
Exclude objects from the compacted pack.- Parameters:
set
- objects to not include.- Returns:
this
.
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exclude
public DfsPackCompactor exclude(DfsPackFile pack) throws IOException
Exclude objects from the compacted pack.- Parameters:
pack
- objects to not include.- Returns:
this
.- Throws:
IOException
- pack index cannot be loaded.
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compact
public void compact(ProgressMonitor pm) throws IOException
Compact the pack files together.- Parameters:
pm
- progress monitor to receive updates on as packing may take a while, depending on the size of the repository.- Throws:
IOException
- the packs cannot be compacted.
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getSourcePacks
public Collection<DfsPackDescription> getSourcePacks()
Get all of the source packs that fed into this compaction.- Returns:
- all of the source packs that fed into this compaction.
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getNewPacks
public List<DfsPackDescription> getNewPacks()
Get new packs created by this compaction.- Returns:
- new packs created by this compaction.
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getNewPackStatistics
public List<PackStatistics> getNewPackStatistics()
Get statistics corresponding to thegetNewPacks()
. May be null if statistics are not available.- Returns:
- statistics corresponding to the
getNewPacks()
.
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