PackBitmapIndex: Add AddToBitmapWithCacheFilter class
Add a new revwalk filter, AddToBitmapWithCachedFilter. This filter updates a client-provided {@code BitmapBuilder} as a side effect of a revwalk. Similar to {@code AddToBitmapFilter}, it short circuits the walk when it encounters a commit which is included in the provided bitmap's BitmapIndex. It also short circuits the walk if it encounters the client-provided cached commit. Change-Id: I62cb503016f4d3995d648d92b82baab7f93549a9 Signed-off-by: Yunjie Li <yunjieli@google.com>
This commit is contained in:
parent
b1d4b45708
commit
067d946090
|
@ -0,0 +1,91 @@
|
||||||
|
/*
|
||||||
|
* Copyright (c) 2020, Google LLC and others
|
||||||
|
*
|
||||||
|
* This program and the accompanying materials are made available under the
|
||||||
|
* terms of the Eclipse Distribution License v. 1.0 which is available at
|
||||||
|
* http://www.eclipse.org/org/documents/edl-v10.php.
|
||||||
|
*
|
||||||
|
* SPDX-License-Identifier: BSD-3-Clause
|
||||||
|
*/
|
||||||
|
package org.eclipse.jgit.internal.revwalk;
|
||||||
|
|
||||||
|
import org.eclipse.jgit.lib.BitmapIndex.Bitmap;
|
||||||
|
import org.eclipse.jgit.lib.BitmapIndex.BitmapBuilder;
|
||||||
|
import org.eclipse.jgit.lib.Constants;
|
||||||
|
import org.eclipse.jgit.lib.AnyObjectId;
|
||||||
|
import org.eclipse.jgit.revwalk.filter.RevFilter;
|
||||||
|
import org.eclipse.jgit.revwalk.RevWalk;
|
||||||
|
import org.eclipse.jgit.revwalk.RevCommit;
|
||||||
|
import org.eclipse.jgit.revwalk.RevFlag;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* A RevFilter that adds the visited commits to {@code bitmap} as a side effect.
|
||||||
|
* <p>
|
||||||
|
* When the walk hits a commit that is the same as {@code cachedCommit} or is
|
||||||
|
* part of {@code bitmap}'s BitmapIndex, that entire bitmap is ORed into
|
||||||
|
* {@code bitmap} and the commit and its parents are marked as SEEN so that the
|
||||||
|
* walk does not have to visit its ancestors. This ensures the walk is very
|
||||||
|
* short if there is good bitmap coverage.
|
||||||
|
*/
|
||||||
|
public class AddToBitmapWithCacheFilter extends RevFilter {
|
||||||
|
private final AnyObjectId cachedCommit;
|
||||||
|
|
||||||
|
private final Bitmap cachedBitmap;
|
||||||
|
|
||||||
|
private final BitmapBuilder bitmap;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Create a filter with a cached BitmapCommit that adds visited commits to
|
||||||
|
* the given bitmap.
|
||||||
|
*
|
||||||
|
* @param cachedCommit
|
||||||
|
* the cached commit
|
||||||
|
* @param cachedBitmap
|
||||||
|
* the bitmap corresponds to {@code cachedCommit}}
|
||||||
|
* @param bitmap
|
||||||
|
* bitmap to write visited commits to
|
||||||
|
*/
|
||||||
|
public AddToBitmapWithCacheFilter(AnyObjectId cachedCommit,
|
||||||
|
Bitmap cachedBitmap,
|
||||||
|
BitmapBuilder bitmap) {
|
||||||
|
this.cachedCommit = cachedCommit;
|
||||||
|
this.cachedBitmap = cachedBitmap;
|
||||||
|
this.bitmap = bitmap;
|
||||||
|
}
|
||||||
|
|
||||||
|
/** {@inheritDoc} */
|
||||||
|
@Override
|
||||||
|
public final boolean include(RevWalk rw, RevCommit c) {
|
||||||
|
Bitmap visitedBitmap;
|
||||||
|
|
||||||
|
if (bitmap.contains(c)) {
|
||||||
|
// already included
|
||||||
|
} else if ((visitedBitmap = bitmap.getBitmapIndex()
|
||||||
|
.getBitmap(c)) != null) {
|
||||||
|
bitmap.or(visitedBitmap);
|
||||||
|
} else if (cachedCommit.equals(c)) {
|
||||||
|
bitmap.or(cachedBitmap);
|
||||||
|
} else {
|
||||||
|
bitmap.addObject(c, Constants.OBJ_COMMIT);
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
|
||||||
|
for (RevCommit p : c.getParents()) {
|
||||||
|
p.add(RevFlag.SEEN);
|
||||||
|
}
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
/** {@inheritDoc} */
|
||||||
|
@Override
|
||||||
|
public final RevFilter clone() {
|
||||||
|
throw new UnsupportedOperationException();
|
||||||
|
}
|
||||||
|
|
||||||
|
/** {@inheritDoc} */
|
||||||
|
@Override
|
||||||
|
public final boolean requiresCommitBody() {
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
Loading…
Reference in New Issue