dfs: Take size as long instead of int

Practically we wouldn't have 2GB+ objects in the DfsBlockCache, but by
making it long, we can clean up some long-to-integer conversions.

Change-Id: I1217f5f273a1420d80e2307ac9ff4a52460237a2
Signed-off-by: Masaya Suzuki <masayasuzuki@google.com>

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsBlockCache.java

@@ -449,7 +449,7 @@ public final class DfsBlockCache {
 	}
 
 	@SuppressWarnings("unchecked")
-	private void reserveSpace(int reserve, DfsStreamKey key) {
+	private void reserveSpace(long reserve, DfsStreamKey key) {
 		clockLock.lock();
 		try {
 			long live = LongStream.of(getCurrentSize()).sum() + reserve;
@@ -486,7 +486,7 @@ public final class DfsBlockCache {
 		}
 	}
 
-	private void creditSpace(int credit, DfsStreamKey key) {
+	private void creditSpace(long credit, DfsStreamKey key) {
 		clockLock.lock();
 		try {
 			getStat(liveBytes, key).addAndGet(-credit);
@@ -496,7 +496,7 @@ public final class DfsBlockCache {
 	}
 
 	@SuppressWarnings("unchecked")
-	private void addToClock(Ref ref, int credit) {
+	private void addToClock(Ref ref, long credit) {
 		clockLock.lock();
 		try {
 			if (credit != 0) {
@@ -576,10 +576,10 @@ public final class DfsBlockCache {
 	}
 
 	<T> Ref<T> putRef(DfsStreamKey key, long size, T v) {
-		return put(key, 0, (int) Math.min(size, Integer.MAX_VALUE), v);
+		return put(key, 0, size, v);
 	}
 
-	<T> Ref<T> put(DfsStreamKey key, long pos, int size, T v) {
+	<T> Ref<T> put(DfsStreamKey key, long pos, long size, T v) {
 		int slot = slot(key, pos);
 		HashEntry e1 = table.get(slot);
 		Ref<T> ref = scanRef(e1, key, pos);
@@ -722,12 +722,12 @@ public final class DfsBlockCache {
 	static final class Ref<T> {
 		final DfsStreamKey key;
 		final long position;
-		final int size;
+		final long size;
 		volatile T value;
 		Ref next;
 		volatile boolean hot;
 
-		Ref(DfsStreamKey key, long position, int size, T v) {
+		Ref(DfsStreamKey key, long position, long size, T v) {
 			this.key = key;
 			this.position = position;
 			this.size = size;

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java

@@ -1035,12 +1035,13 @@ public final class DfsPackFile extends BlockBasedFile {
 					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, REF_POSITION, sz, idx);
+				return new DfsBlockCache.Ref<>(
+						idxKey,
+						REF_POSITION,
+						idx.getObjectCount() * REC_SIZE,
+						idx);
 			} finally {
 				ctx.stats.readIdxMicros += elapsedMicros(start);
 			}
@@ -1058,9 +1059,12 @@ public final class DfsPackFile extends BlockBasedFile {
 	private DfsBlockCache.Ref<PackReverseIndex> loadReverseIdx(
 			DfsReader ctx, DfsStreamKey revKey, PackIndex idx) {
 		PackReverseIndex revidx = new PackReverseIndex(idx);
-		int sz = (int) Math.min(idx.getObjectCount() * 8, Integer.MAX_VALUE);
 		reverseIndex = revidx;
-		return new DfsBlockCache.Ref<>(revKey, REF_POSITION, sz, revidx);
+		return new DfsBlockCache.Ref<>(
+				revKey,
+				REF_POSITION,
+				idx.getObjectCount() * 8,
+				revidx);
 	}
 
 	private DfsBlockCache.Ref<PackBitmapIndex> loadBitmapIndex(
@@ -1089,9 +1093,9 @@ public final class DfsPackFile extends BlockBasedFile {
 				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, REF_POSITION, sz, bmidx);
+			return new DfsBlockCache.Ref<>(
+					bitmapKey, REF_POSITION, size, bmidx);
 		} catch (EOFException e) {
 			throw new IOException(MessageFormat.format(
 					DfsText.get().shortReadOfIndex,