HeaderEntry Class — netty Architecture

Source Code

codec-http3/src/main/java/io/netty/handler/codec/http3/QpackEncoderDynamicTable.java lines 442–489

    private static final class HeaderEntry extends QpackHeaderField {
        /**
         * Pointer to the next entry in insertion order with a different {@link #hash} than this entry.
         */
        HeaderEntry next;

        /**
         * Pointer to the next entry in insertion order with the same {@link #hash} as this entry, a.k.a hash collisions
         */
        HeaderEntry nextSibling;

        /**
         * Number of header blocks that refer to this entry as the value for its <a
         * href="https://www.rfc-editor.org/rfc/rfc9204.html#name-required-insert-count">
         * required insert count</a>
         */
        int refCount;

        /**
         * Hashcode for this entry.
         */
        final int hash;

        /**
         * Insertion index for this entry.
         */
        final int index;

        HeaderEntry(int hash, CharSequence name, CharSequence value, int index, @Nullable HeaderEntry nextSibling) {
            super(name, value);
            this.index = index;
            this.hash = hash;
            this.nextSibling = nextSibling;
        }

        void remove(HeaderEntry prev) {
            assert prev != this;
            prev.next = next;
            next = null; // null references to prevent nepotism in generational GC.
            nextSibling = null;
        }

        void addNextTo(HeaderEntry prev) {
            assert prev != this;
            this.next = prev.next;
            prev.next = this;
        }
    }