lhotari commented on code in PR #4196:
URL: https://github.com/apache/bookkeeper/pull/4196#discussion_r1472960488
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bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/checksum/DigestManager.java:
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@@ -49,14 +49,89 @@ public abstract class DigestManager {
public static final int METADATA_LENGTH = 32;
public static final int LAC_METADATA_LENGTH = 16;
+ private static final int MAX_SUB_BUFFER_VISIT_RECURSION_DEPTH = 10;
final long ledgerId;
final boolean useV2Protocol;
private final ByteBufAllocator allocator;
abstract int getMacCodeLength();
- abstract int update(int digest, ByteBuf buffer, int offset, int len);
+ abstract int internalUpdate(int digest, ByteBuf buffer, int offset, int
len);
+
+ final int update(int digest, ByteBuf buffer, int offset, int len) {
+ return recursiveSubBufferVisitForDigestUpdate(digest, buffer, offset,
len, 0);
+ }
+
+ private int recursiveSubBufferVisitForDigestUpdate(int digest, ByteBuf
buffer, int offset, int len, int depth) {
+ if (len == 0) {
+ return digest;
+ }
+ if (depth < MAX_SUB_BUFFER_VISIT_RECURSION_DEPTH &&
!buffer.hasMemoryAddress() && !buffer.hasArray()) {
+ return visitWrappedBuffersAndCallInternalUpdateForEach(digest,
buffer, offset, len, depth);
+ }
+ return internalUpdate(digest, buffer, offset, len);
+ }
+
+ /**
+ * This method is used to visit the wrapped buffers and call
internalUpdate for each of them.
+ * CompositeByteBuf is one of the wrapped buffer types that will be
visited. It can contain multiple
+ * sub buffers. The sub buffers can be wrapped buffers as well.
+ *
+ * Netty doesn't provide an API to visit the wrapped buffers, so we have
to use the a hack here.
+ *
+ * @param digest current digest value
+ * @param buffer the buffer to visit
+ * @param offset the offset in the buffer
+ * @param len the length in the buffer
+ * @param depth the recursion depth of the wrapped buffer visit
+ * @return updated digest value
+ */
+ private int visitWrappedBuffersAndCallInternalUpdateForEach(int digest,
ByteBuf buffer, int offset, int len,
+ int depth) {
+ // hold the digest in a MutableInt so that it can be updated in the
wrapped buffer visit
+ MutableInt digestRef = new MutableInt(digest);
+ ByteBuf sliced = buffer.slice(offset, len);
+ // call getBytes to trigger the wrapped buffer visit
+ sliced.getBytes(0, new DuplicatedByteBuf(Unpooled.EMPTY_BUFFER) {
Review Comment:
@BewareMyPower I have address your review feedback and attempted to cover
your concerns by refactoring the ByteBuf visiting solution. It no longer uses
`DuplicatedByteBuf` as the base class. Instead a full custom `ByteBuf`
implementation is used with `throw new UnsupportedOperationException()` bodies
for all other methods than the ones that are part of the `getBytes`/`setBytes`
interface contract. This will ensure that things will break if something
unexpected is passed as input.
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