github
/
jgit
mirror of https://gitee.com/github-mirror-repo/jgit.git
1
0
Fork 0
Code Issues Releases Wiki Activity
Browse Source

Merge "Strongly reference indices in DfsPackFile"

stable-5.4
Jonathan Nieder 6 years ago committed by Gerrit Code Review @ Eclipse.org
parent
98df7ec801 01f084f5d9
commit
2fe1f0d638
1 changed files with 113 additions and 128 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Unified View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 241
      org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java

241
org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java
Unescape View File

@ -98,13 +98,13 @@ public final class DfsPackFile extends BlockBasedFile {
private final Object initLock = new Object(); private final Object initLock = new Object();
/** Index mapping {@link ObjectId} to position within the pack stream. */ /** Index mapping {@link ObjectId} to position within the pack stream. */
private volatile DfsBlockCache.Ref<PackIndex> index; private volatile PackIndex index;
/** Reverse version of {@link #index} mapping position to {@link ObjectId}. */ /** Reverse version of {@link #index} mapping position to {@link ObjectId}. */
private volatile DfsBlockCache.Ref<PackReverseIndex> reverseIndex; private volatile PackReverseIndex reverseIndex;
/** Index of compressed bitmap mapping entire object graph. */ /** Index of compressed bitmap mapping entire object graph. */
private volatile DfsBlockCache.Ref<PackBitmapIndex> bitmapIndex; private volatile PackBitmapIndex bitmapIndex;
/** /**
* Objects we have tried to read, and discovered to be corrupt. * Objects we have tried to read, and discovered to be corrupt.
@ -150,15 +150,15 @@ public final class DfsPackFile extends BlockBasedFile {
* @return whether the pack index file is loaded and cached in memory. * @return whether the pack index file is loaded and cached in memory.
*/ */
public boolean isIndexLoaded() { public boolean isIndexLoaded() {
DfsBlockCache.Ref<PackIndex> idxref = index; return index != null;
return idxref != null && idxref.has();
} }
void setPackIndex(PackIndex idx) { void setPackIndex(PackIndex idx) {
long objCnt = idx.getObjectCount(); long objCnt = idx.getObjectCount();
int recSize = Constants.OBJECT_ID_LENGTH + 8; int recSize = Constants.OBJECT_ID_LENGTH + 8;
long sz = objCnt * recSize; long sz = objCnt * recSize;
index = cache.putRef(desc.getStreamKey(INDEX), sz, idx); cache.putRef(desc.getStreamKey(INDEX), sz, idx);
index = idx;
} }
/** /**
@ -176,12 +176,8 @@ public final class DfsPackFile extends BlockBasedFile {
} }
private PackIndex idx(DfsReader ctx) throws IOException { private PackIndex idx(DfsReader ctx) throws IOException {
DfsBlockCache.Ref<PackIndex> idxref = index; if (index != null) {
if (idxref != null) { return index;
PackIndex idx = idxref.get();
if (idx != null) {
return idx;
}
} }
if (invalid) { if (invalid) {
@ -192,59 +188,60 @@ public final class DfsPackFile extends BlockBasedFile {
.dispatch(new BeforeDfsPackIndexLoadedEvent(this)); .dispatch(new BeforeDfsPackIndexLoadedEvent(this));
synchronized (initLock) { synchronized (initLock) {
idxref = index; if (index != null) {
if (idxref != null) { return index;
PackIndex idx = idxref.get();
if (idx != null) {
return idx;
}
} }
DfsStreamKey idxKey = desc.getStreamKey(INDEX);
try { try {
idxref = cache.getOrLoadRef(idxKey, () -> { DfsStreamKey idxKey = desc.getStreamKey(INDEX);
try { DfsBlockCache.Ref<PackIndex> idxref = cache.getOrLoadRef(idxKey,
ctx.stats.readIdx++; () -> {
long start = System.nanoTime(); try {
try (ReadableChannel rc = ctx.db.openFile(desc, ctx.stats.readIdx++;
INDEX)) { long start = System.nanoTime();
InputStream in = Channels.newInputStream(rc); try (ReadableChannel rc = ctx.db.openFile(desc,
int wantSize = 8192; INDEX)) {
int bs = rc.blockSize(); InputStream in = Channels
if (0 < bs && bs < wantSize) { .newInputStream(rc);
bs = (wantSize / bs) * bs; int wantSize = 8192;
} else if (bs <= 0) { int bs = rc.blockSize();
bs = wantSize; if (0 < bs && bs < wantSize) {
bs = (wantSize / bs) * bs;
} else if (bs <= 0) {
bs = wantSize;
}
PackIndex idx = PackIndex.read(
new BufferedInputStream(in, bs));
int sz = (int) Math.min(
idx.getObjectCount() * REC_SIZE,
Integer.MAX_VALUE);
ctx.stats.readIdxBytes += rc.position();
index = idx;
return new DfsBlockCache.Ref<>(idxKey, 0,
sz, idx);
} finally {
ctx.stats.readIdxMicros += elapsedMicros(
start);
}
} catch (EOFException e) {
throw new IOException(MessageFormat.format(
DfsText.get().shortReadOfIndex,
desc.getFileName(INDEX)), e);
} catch (IOException e) {
throw new IOException(MessageFormat.format(
DfsText.get().cannotReadIndex,
desc.getFileName(INDEX)), e);
} }
PackIndex idx = PackIndex });
.read(new BufferedInputStream(in, bs)); PackIndex idx = idxref.get();
int sz = (int) Math.min( if (index == null && idx != null) {
idx.getObjectCount() * REC_SIZE, index = idx;
Integer.MAX_VALUE); }
ctx.stats.readIdxBytes += rc.position(); return index;
return new DfsBlockCache.Ref<>(idxKey, 0, sz, idx);
} finally {
ctx.stats.readIdxMicros += elapsedMicros(start);
}
} catch (EOFException e) {
throw new IOException(MessageFormat.format(
DfsText.get().shortReadOfIndex,
desc.getFileName(INDEX)), e);
} catch (IOException e) {
throw new IOException(MessageFormat.format(
DfsText.get().cannotReadIndex,
desc.getFileName(INDEX)), e);
}
});
} catch (IOException e) { } catch (IOException e) {
invalid = true; invalid = true;
throw e; throw e;
} }
PackIndex idx = idxref.get();
if (idx != null) {
index = idxref;
}
return idx;
} }
} }
@ -257,102 +254,90 @@ public final class DfsPackFile extends BlockBasedFile {
return null; return null;
} }
DfsBlockCache.Ref<PackBitmapIndex> idxref = bitmapIndex; if (bitmapIndex != null) {
if (idxref != null) { return bitmapIndex;
PackBitmapIndex bmidx = idxref.get();
if (bmidx != null) {
return bmidx;
}
} }
synchronized (initLock) { synchronized (initLock) {
idxref = bitmapIndex; if (bitmapIndex != null) {
if (idxref != null) { return bitmapIndex;
PackBitmapIndex bmidx = idxref.get();
if (bmidx != null) {
return bmidx;
}
} }
PackIndex idx = idx(ctx); PackIndex idx = idx(ctx);
PackReverseIndex revidx = getReverseIdx(ctx); PackReverseIndex revidx = getReverseIdx(ctx);
DfsStreamKey bitmapKey = desc.getStreamKey(BITMAP_INDEX); DfsStreamKey bitmapKey = desc.getStreamKey(BITMAP_INDEX);
idxref = cache.getOrLoadRef(bitmapKey, () -> { DfsBlockCache.Ref<PackBitmapIndex> idxref = cache
ctx.stats.readBitmap++; .getOrLoadRef(bitmapKey, () -> {
long start = System.nanoTime(); ctx.stats.readBitmap++;
try (ReadableChannel rc = ctx.db.openFile(desc, BITMAP_INDEX)) { long start = System.nanoTime();
long size; try (ReadableChannel rc = ctx.db.openFile(desc,
PackBitmapIndex bmidx; BITMAP_INDEX)) {
try { long size;
InputStream in = Channels.newInputStream(rc); PackBitmapIndex bmidx;
int wantSize = 8192; try {
int bs = rc.blockSize(); InputStream in = Channels.newInputStream(rc);
if (0 < bs && bs < wantSize) { int wantSize = 8192;
bs = (wantSize / bs) * bs; int bs = rc.blockSize();
} else if (bs <= 0) { if (0 < bs && bs < wantSize) {
bs = wantSize; bs = (wantSize / bs) * bs;
} else if (bs <= 0) {
bs = wantSize;
}
in = new BufferedInputStream(in, bs);
bmidx = PackBitmapIndex.read(in, idx, revidx);
} finally {
size = rc.position();
ctx.stats.readIdxBytes += size;
ctx.stats.readIdxMicros += elapsedMicros(start);
}
int sz = (int) Math.min(size, Integer.MAX_VALUE);
bitmapIndex = bmidx;
return new DfsBlockCache.Ref<>(bitmapKey, 0, sz,
bmidx);
} catch (EOFException e) {
throw new IOException(MessageFormat.format(
DfsText.get().shortReadOfIndex,
desc.getFileName(BITMAP_INDEX)), e);
} catch (IOException e) {
throw new IOException(MessageFormat.format(
DfsText.get().cannotReadIndex,
desc.getFileName(BITMAP_INDEX)), e);
} }
in = new BufferedInputStream(in, bs); });
bmidx = PackBitmapIndex.read(in, idx, revidx);
} finally {
size = rc.position();
ctx.stats.readIdxBytes += size;
ctx.stats.readIdxMicros += elapsedMicros(start);
}
int sz = (int) Math.min(size, Integer.MAX_VALUE);
return new DfsBlockCache.Ref<>(bitmapKey, 0, sz, bmidx);
} catch (EOFException e) {
throw new IOException(
MessageFormat.format(DfsText.get().shortReadOfIndex,
desc.getFileName(BITMAP_INDEX)),
e);
} catch (IOException e) {
throw new IOException(
MessageFormat.format(DfsText.get().cannotReadIndex,
desc.getFileName(BITMAP_INDEX)),
e);
}
});
PackBitmapIndex bmidx = idxref.get(); PackBitmapIndex bmidx = idxref.get();
if (bmidx != null) { if (bitmapIndex == null && bmidx != null) {
bitmapIndex = idxref; bitmapIndex = bmidx;
} }
return bmidx; return bitmapIndex;
} }
} }
PackReverseIndex getReverseIdx(DfsReader ctx) throws IOException { PackReverseIndex getReverseIdx(DfsReader ctx) throws IOException {
DfsBlockCache.Ref<PackReverseIndex> revref = reverseIndex; if (reverseIndex != null) {
if (revref != null) { return reverseIndex;
PackReverseIndex revidx = revref.get();
if (revidx != null) {
return revidx;
}
} }
synchronized (initLock) { synchronized (initLock) {
revref = reverseIndex; if (reverseIndex != null) {
if (revref != null) { return reverseIndex;
PackReverseIndex revidx = revref.get();
if (revidx != null) {
return revidx;
}
} }
PackIndex idx = idx(ctx); PackIndex idx = idx(ctx);
DfsStreamKey revKey = new DfsStreamKey.ForReverseIndex( DfsStreamKey revKey = new DfsStreamKey.ForReverseIndex(
desc.getStreamKey(INDEX)); desc.getStreamKey(INDEX));
revref = cache.getOrLoadRef(revKey, () -> { DfsBlockCache.Ref<PackReverseIndex> revref = cache
PackReverseIndex revidx = new PackReverseIndex(idx); .getOrLoadRef(revKey, () -> {
int sz = (int) Math.min(idx.getObjectCount() * 8, PackReverseIndex revidx = new PackReverseIndex(idx);
Integer.MAX_VALUE); int sz = (int) Math.min(idx.getObjectCount() * 8,
return new DfsBlockCache.Ref<>(revKey, 0, sz, revidx); Integer.MAX_VALUE);
}); reverseIndex = revidx;
return new DfsBlockCache.Ref<>(revKey, 0, sz, revidx);
});
PackReverseIndex revidx = revref.get(); PackReverseIndex revidx = revref.get();
if (revidx != null) { if (reverseIndex == null && revidx != null) {
reverseIndex = revref; reverseIndex = revidx;
} }
return revidx; return reverseIndex;
} }
} }

Write Preview
Loading…
Cancel
Save