The reuse system used by an object database may be able to benefit
from knowing what objects are coming next, and even improve data
throughput by delaying (or moving up) objects that are stored near
each other in the source database.
Pushing the iteration down into the reuse code makes it possible
for a smarter implementation to aggregate reuse. But for the
standard pack file format on disk we don't bother, its quite
efficient already.
Change-Id: I64f0048ca7071a8b44950d6c2a5dfbca3be6bba6
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Some instances may benefit from having access to memory efficient
storage for some small values, like single flag bits. Give up a
portion of our delta depth field to make 4 bits available to any
subclass that wants it.
This still gives us room for delta chains of 1,048,576 objects,
and that is just insane. Unpacking 1 million objects to get to
something is longer than most users are willing to wait for data
from Git.
Change-Id: If17ea598dc0ddbde63d69a6fcec0668106569125
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
An ObjectReader implementation may be very slow for a single object,
but yet support bulk queries efficiently by batching multiple small
requests into a single larger request. This easily happens when the
reader is built on top of a database that is stored on another host,
as the network round-trip time starts to dominate the operation cost.
RevWalk, ObjectWalk, UploadPack and PackWriter are the first major
users of this new bulk interface, with the goal being to support an
efficient way to pack a repository for a fetch/clone client when the
source repository is stored in a high-latency storage system.
Processing the want/have lists is now done in bulk, to remove
the high costs associated with common ancestor negotiation.
PackWriter already performs object reuse selection in bulk, but it
now can also do the object size lookup and object counting phases
with higher efficiency. Actual object reuse, deltification, and
final output are still doing sequential lookups, making them a bit
more expensive to perform.
Change-Id: I4c966f84917482598012074c370b9831451404ee
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
By giving the reader information about the roots of a revision
traversal, some readers may be able to prefetch information from
their backing store using background threads in order to reduce
data access latency. However this isn't typically necessary so
the default reader implementation doesn't react to the advice.
Change-Id: I72c6cbd05cff7d8506826015f50d9f57d5cda77e
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
ObjectReader implementations may wish to use multiple threads in
order to evaluate object reuse faster. Let the reader make that
decision by passing the iteration down into the reader.
Because the work is pushed into the reader, it may need to locate a
given ObjectToPack given its ObjectId. This can easily occur if the
reader has sent a list of ObjectIds to the object database and gets
back information keyed only by ObjectId, without the ObjectToPack
handle. Expose lookup using the PackWriter's own internal map,
so the reader doesn't need to build a redundant copy to track the
assocation of ObjectId back to ObjectToPack.
Change-Id: I0c536405a55034881fb5db92a2d2a99534faed34
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
When the output stream is deeply buffered (e.g. 1 MiB or more in
an HTTP servlet on some containers) trying to kick out the header
earlier will prevent the client from stalling hard while the first
1 MiB is received and it can process the pack header. Forcing a
flush here lets the client see the header and start its progress
monitor for "Receiving objects: (1/N)" so the user knows there
is still activity occurring, even though the buffering may cause
there to be some lag as the buffer fills up on the sending side.
Change-Id: I3edf39e8f703fe87a738dc236d426b194db85e3a
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Callers catching a MissingObjectException may need programmatic
access to the ObjectId that wasn't available in the repository.
Change-Id: I2be0380251ebe7e4921fa74e246724e48ad88b0e
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Storage implementations or application code using an ObjectReader
may want to access this constant without being inside of a subclass
of the reader.
Change-Id: I6c871a03d5846b9bb899de4d14a265e8b204d8e0
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Storage implementations may find this useful when implementing the
ObjectReuseAsIs interface on their ObjectReader. Expose it so we
don't force them to create a redundant copy of the information.
Change-Id: I802ec8113c00884fccde5d0e92b9849716316f62
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This permits formatting in hex into an existing byte array
supplied by the caller, and mirrors our copyRawTo method
with the same parameter signature.
Change-Id: Ia078d83e338b09b903bfd2d04284e5283f885a19
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Callers might have a canonical tag encoding on hand that they
wish to convert into a clean structure for presentation purposes,
and the object may not be available in a repository. (E.g. maybe
its a "draft" tag being written in an editor.)
Change-Id: I387a462afb70754aa7ee20891e6c0262438fdf32
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Callers might have a canonical commit encoding on hand that they
wish to convert into a clean structure for presentation purposes,
and the object may not be available in a repository. (E.g. maybe
its a "draft" commit being written in an editor.)
Change-Id: I21759cff337cbbb34dbdde91aec5aa4448a1ef37
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The Tag class now only supports the creation of an annotated tag
object. To read an annotated tag, applictions should use RevTag.
This permits us to have exactly one implementation, and RevTag's
is faster and more bug-free.
Change-Id: Ib573f7e15f36855112815269385c21dea532e2cf
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The Commit class now only supports the creation of a commit object.
To read a commit, applictions should use RevCommit. This permits
us to have exactly one implementation, and RevCommit's is faster
and more bug-free.
Change-Id: Ib573f7e15f36855112815269385c21dea532e2cf
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Git doesn't store millisecond accuracy in person identity lines,
so a line that we create in Java and round-trip through a Git object
wouldn't compare as being equal. Truncate to seconds when comparing
values to ensure the same identity is equal.
Change-Id: Ie4ebde64061f52c612714e89ad34de8ac2694b07
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
When we need the canonical form of a commit or a tag in order to
parse it into our RevCommit or RevTag fields, we really need it as a
single contiguous byte array. However the ObjectDatabase may choose
to give us a large loader. In general commits or tags are always
under the several MiB limit, so even if the loader calls it "large"
we should still be able to afford the JVM heap memory required to
get a single byte array. Coerce even large loaders into a single
byte array anyway.
Change-Id: I04efbaa7b31c5f4b0a68fc074821930b1132cfcf
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
ReadTreeTests relied on Repository.getIndex() which on
platforms which coarse FileSystemTimers failed to detect
index modifications. By explicitly reloading and writing
the index this problem is solved.
Change-Id: I0a98babfc2068a3b6b7d2257834988e1154f5b26
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Since equals() is now final and does not permit being overridden,
we should do the same thing with compareTo() to prevent different
subclasses from having different ordering behaviors. This could
lead to the same mess that we had with different equals() behaviors.
Change-Id: I35a849b6efccee5fe74cc5788a3566a1516004b7
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Since equals() is now final and does not permit being overridden,
we should do the same thing with hashCode() to prevent different
subclasses from having different hashing behaviors. This could
lead to the same mess that we had with different equals() behaviors.
Change-Id: I35a849b6efccee5fe74cc5788a3566a1516004b7
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
When RevObject overrode equals() to provide only reference equality
we used to need to convert a RevObject into an ObjectId by copy()
just to use standard Java tools like JUnit assertEquals(), or to
use contains() or get() on standard java.util collection types.
Now that we have removed this override and made ObjectId's equals()
final (preventing any of this mess in the future), some copy()
calls are unnecessary. Anytime the value is being used as an input
to a lookup routine, or to an equals, we can avoid the copy().
However we still want to use copy() anytime we are given an ObjectId
that may exist long-term, where we don't want the high cost of the
additional storage from a RevCommit extension. So we can't remove
all uses of copy(), just some of them.
Change-Id: Ief275dace435c0ddfa362ac8e5d93558bc7e9fc3
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Configuration change events were not being triggered, now they are
forwarded from the FileConfig up to the Repository's listeners.
Change-Id: Ida94a59f5a2b7fa8ae0126e33c13343275483ee5
Signed-off-by: Mathias Kinzler <mathias.kinzler@sap.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The MergeResult class is enhanced to report more data about a
three-way merge. Information about conflicts and the base, ours,
theirs commits can be retrived.
Change-Id: Iaaf41a1f4002b8fe3ddfa62dc73c787f363460c2
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
We should be more lenient when tagging without an
tagger or message. Currently, we will throw an NPE
which is incorrect behavior.
Change-Id: I04e30ce25a9432e4ca56c3f29658ecb24fb18d24
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
There was a duplicated getter and setter for tagger in Tag.
There's no needed to have two getters and setters that represent
the same things. The appropriate tests were updated also.
Change-Id: If46dc00c4c0f31ea4234c6d3bda3c03e6ebbafac
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
indexState() encodes the complete state of the index
into one readable String. This helps to write tests
against the index. indexState() is enhanced to optionally
also contain the content of the files in the index.
Change-Id: Ie988f93768d864f4cbd55809a786bd5759fc24a5
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Added a utility method to set the reset an index to match exactly
some content in the filesystem. This can be used by tests to prepare
commits in the working-tree and set the index in one shot.
[sp: Cleaned up formatting, added getEntryFile(), released inserter.]
Change-Id: If38b1f7cacaaf769f51b14541c5da0c1e24568a5
Signed-off-by: Christian Halstrick <christian.halstrick@sap.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Such events make no sense, it has never been visible to this
process so no client can have a stale value of the ref.
Change-Id: Iea3a5035b0a1410b80b09cf53387b22b78b18018
Signed-off-by: Robin Rosenberg <robin.rosenberg@dewire.com>
Add a convenience API in FileRepository to pass in a String that
points to the GIT_DIR location. This is converted to a File and
sent through the usual constructor.
Change-Id: I588388f37e89b8c690020f110a1bc59f46170c40
This patch fixes the problem that JGit tests run from Maven fail on
Mac OS X [1]. In Eclipse the tests succeed since we set Eclipse
workspace encoding to UTF-8 via "Preferences > General > Workspace
> Text file encoding", checked via JConsole that this setting changes
the JVM system property of the test run. This change copies this
setting to the Maven test environment so that we get consistent test
results on all platforms.
[1] http://kerneltrap.org/mailarchive/git/2009/2/6/4916414/thread
Change-Id: Ia657d4037c518411f7bc3c75626dbafb1f4706a2
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Exclude ignored files from IndexDiff tree walk.
This makes EGit commit much faster.
Change-Id: I398499510c22c37667b7612db32eac3b31d325f0
Signed-off-by: Jens Baumgart <jens.baumgart@sap.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
This can result in an infinitely hanging IDE.
Change-Id: I669bc8d220a07011a42edf79de31825305ff3763
Signed-off-by: Mathias Kinzler <mathias.kinzler@sap.com>
If the exact rename matrix for a particular ObjectId isn't square we
crashed with an ArrayIndexOutOfBoundsException because the matrix
entries were encoded backwards. The encode function accepts the
source (aka deleted) index first, not second. Add a unit test to
cover this non-square case to ensure we don't have this regression
in the future.
Change-Id: I5b005e5093e1f00de2e3ec104e27ab6820203566
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
* changes:
Enable configuration of non-standard pack settings
Pass PackConfig down to PackWriter when packing
Simplify UploadPack use of options during writing
Move PackWriter configuration to PackConfig
Allow PackWriter callers to manage the thread pool
It is useful to be able to replace an existing Change-Id
in the message, for example if the user decides not to
amend the previous commit.
Bug: 321188
Change-Id: I594e7f9efd0c57d794d2bd26d55ec45f4e6a47fd
Signed-off-by: Stefan Lay <stefan.lay@sap.com>
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>
TreeWalk calls this value "path", while "name" is the stuff after the
last slash. FileHeader should do the same thing to be consistent.
Rename getOldName to getOldPath and getNewName to getNewPath.
Bug: 318526
Change-Id: Ib2e372ad4426402d37939b48d8f233154cc637da
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Shawn O. Pearce
Christian Halstrick
Mathias Kinzler
Chris Aniszczyk
Robin Rosenberg
Ketan Padegaonkar
Matthias Sohn
Jens Baumgart
Stefan Lay