Fix public API issues introduced in I1baeedcc6946.
Move ObjectCountCallback and WriteAbortedException to package
org.eclipse.jgit.transport, so that they'll become public API.
Change-Id: I95e3cfaa49f3f7371e794d5c253cf6981f87cae0
Signed-off-by: Yuxuan 'fishy' Wang <fishywang@google.com>
Added callback in PackWriter and BundleWriter for the caller to get the
count of objects to write, and a chance to abort the write operation.
Change-Id: I1baeedcc6946b1093652de4a707fe597a577e526
Signed-off-by: Yuxuan 'fishy' Wang <fishywang@google.com>
Disable CRC32 computation when no PackIndex will be created
If a server is streaming 3GiB worth of pack data to a client there
is no reason to compute the CRC32 checksum on the objects. The
CRC32 code computed by PackWriter is used only in the new index
created by writeIndex(), which is never invoked for the native Git
network protocols.
Object reuse may still compute its own CRC32 to verify the data
being copied from an existing pack has not been corrupted. This
check is done by the ObjectReader that implements ObjectReuseAsIs
and has no relationship to the CRC32 being skipped during output.
Change-Id: I05626f2e0d6ce19119b57d8a27193922636d60a7
JGit 3.0: move internal classes into an internal subpackage
This breaks all existing callers once. Applications are not supposed
to build against the internal storage API unless they can accept API
churn and make necessary updates as versions change.
Change-Id: I2ab1327c202ef2003565e1b0770a583970e432e9
PackWriter: Avoid CRC-32 validation when feeding IndexPack
There is no need to validate the object contents during
copyObjectAsIs if the result is going to be parsed by unpack-objects
or index-pack. Both programs will compute the SHA-1 of the object,
and also validate most of the pack structure. For git daemon
like servers, this work is already done on the client end of the
connection, so the server doesn't need to repeat that work itself.
Disable object validation for the 3 transport cases where we know
the remote side will handle object validation for us (push, bundle
creation, and upload pack). This improves performance on the server
side by reducing the work that must be done.
Change-Id: Iabb78eec45898e4a17f7aab3fb94c004d8d69af6
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Many source browsers and network related tools like UploadPack need
to find and parse the target of all branches and annotated tags
within the repository during their startup phase. Clustering these
together into the same part of the pack file will improve locality,
reducing thrashing when an application starts and needs to load
all of these into memory at once.
To prevent bottlenecking basic log viewing tools that are scannning
backwards from the tip of a current branch (and don't need tags)
we place this cluster of older targets after 4096 newer commits
have already been placed into the pack stream. 4096 was chosen as
a rough guess, but was based on a few factors:
- log viewers typically show 5-200 commits per page
- users only view the first page or two
- DHT can cram 2200-4000 commits per 1 MiB chunk
thus these will fall into the second commit chunk (roughly)
Unfortunately this placement hurts history tools that are scanning
backwards through the commit graph and completely ignored tags or
branch heads when they started.
An ancient tagged commit is no longer positioned behind its first
child (its now much earlier), resulting in a page fault for the
parser to reload this cluster of objects on demand. This may be
an acceptable loss. If a user is walking backwards and has already
scanned through more than 4096 commits of history, waiting for the
region to reload isn't really that bad compared to the amount of
time already spent.
If the repository is so small that there are less than 4096 commits,
this change has no impact on the placement of objects.
Change-Id: If3052e430d305e17878d94145c93754f56b74c61
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
CGit just learned to always use OFS_DELTA when writing out bundle
files. This makes sense because bundle came about well after
OFS_DELTA was established, so any version of CGit that can read a
bundle file can also read OFS_DELTA. Since OFS_DELTA is smaller,
always use it when writing bundles.
Change-Id: I44f9921494798ea0c99e16eab58b87bebeb9aff5
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
When we are creating a pack the higher level application should be able
to override the PackConfig used, allowing it to control the number of
threads used or how much memory is allocated per writer.
Change-Id: I47795987bb0d161d3642082acc2f617d7cb28d8c
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Move PackWriter progress monitors onto the operations
Rather than taking the ProgressMonitor objects in our constructor and
carrying them around as instance fields, take them as arguments to the
actual time consuming operations we need to run.
Change-Id: I2b230d07e277de029b1061c807e67de5428cc1c4
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Ensure ObjectReader used by PackWriter is released
The ObjectReader API demands that we release the reader when we are
done with it. PackWriter contains a reader, which it uses for the
entire packing session. Expose the release of the reader through
a release method on the writer.
This still doesn't address the RevWalk and TreeWalk users, who
don't correctly release their reader. But its a small step in the
right direction.
Change-Id: I5cb0b5c1b432434a799fceb21b86479e09b84a0a
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Similar to what we did with the file code, move the pack writer
into its own package so the related classes and their package
private methods are hidden from the rest of the library.
Change-Id: Ic1b5c7c8c8d266e90c910d8d68dfc8e93586854f
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
The strings are externalized into the root resource bundles.
The resource bundles are stored under the new "resources" source
folder to get proper maven build.
Strings from tests are, in general, not externalized. Only in
cases where it was necessary to make the test pass the strings
were externalized. This was typically necessary in cases where
e.getMessage() was used in assert and the exception message was
slightly changed due to reuse of the externalized strings.
Change-Id: Ic0f29c80b9a54fcec8320d8539a3e112852a1f7b
Signed-off-by: Sasa Zivkov <sasa.zivkov@sap.com>
Reduce multi-level buffered streams in transport code
Some transports actually provide stream buffering on their own,
without needing to be wrapped up inside of a BufferedInputStream in
order to smooth out system calls to read or write. A great example
of this is the JSch SSH client, or the Apache MINA SSHD server.
Both use custom buffering to packetize the streams into the encrypted
SSH channel, and wrapping them up inside of a BufferedInputStream
or BufferedOutputStream is relatively pointless.
Our SideBandOutputStream implementation also provides some fairly
large buffering, equal to one complete side-band packet on the main
data channel. Wrapping that inside of a BufferedOutputStream just to
smooth out small writes from PackWriter causes extra data copies, and
provides no advantage. We can save some memory and some CPU cycles
by letting PackWriter dump directly into the SideBandOutputStream's
internal buffer array.
Instead we push the buffering streams down to be as close to the
network socket (or operating system pipe) as possible. This allows
us to smooth out the smaller reads/writes from pkt-line messages
during advertisement and negotation, but avoid copying altogether
when the stream switches to larger writes over a side band channel.
Change-Id: I2f6f16caee64783c77d3dd1b2a41b3cc0c64c159
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Use Constants.OBJECT_ID_STRING_LENGTH instead of LEN * 2
A few locations were doing OBJECT_ID_LENGTH * 2 on their own, as
the old STR_LEN constant wasn't visible. Replace them with the
new public constant OBJECT_ID_STRING_LENGTH.
Change-Id: Id39bddb52de8c65bb097de042e9d4ed99598201f
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Per CQ 3448 this is the initial contribution of the JGit project
to eclipse.org. It is derived from the historical JGit repository
at commit 3a2dd9921c.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Yuxuan 'fishy' Wang
Matthias Sohn
Robin Stocker
Shawn Pearce
Robin Rosenberg
Sasa Zivkov
Git Development Community