newSizeClass() — netty Function Reference

Architecture documentation for the newSizeClass() function in SizeClasses.java from the netty codebase.

Function java Buffer Search calls 1 called by 1

Entity Profile

Buffer→ Search→ newSizeClass() — netty Function Reference

Dependency Diagram

graph TD
  90408e2f_689e_0ba6_ef35_9b594fa267a8["newSizeClass()"]
  d1cbce7b_bd0a_5553_8e62_6deeb38137ff["SizeClasses"]
  90408e2f_689e_0ba6_ef35_9b594fa267a8 -->|defined in| d1cbce7b_bd0a_5553_8e62_6deeb38137ff
  9682c31b_1e8c_cdd5_584a_e9f43b2c752a["SizeClasses()"]
  9682c31b_1e8c_cdd5_584a_e9f43b2c752a -->|calls| 90408e2f_689e_0ba6_ef35_9b594fa267a8
  0fff0007_5d31_e6c3_579f_00f722ad4360["calculateSize()"]
  90408e2f_689e_0ba6_ef35_9b594fa267a8 -->|calls| 0fff0007_5d31_e6c3_579f_00f722ad4360
  style 90408e2f_689e_0ba6_ef35_9b594fa267a8 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

buffer/src/main/java/io/netty/buffer/SizeClasses.java lines 189–219

    private static short[] newSizeClass(int index, int log2Group, int log2Delta, int nDelta, int pageShifts) {
        short isMultiPageSize;
        if (log2Delta >= pageShifts) {
            isMultiPageSize = yes;
        } else {
            int pageSize = 1 << pageShifts;
            int size = calculateSize(log2Group, nDelta, log2Delta);

            isMultiPageSize = size == size / pageSize * pageSize? yes : no;
        }

        int log2Ndelta = nDelta == 0? 0 : log2(nDelta);

        byte remove = 1 << log2Ndelta < nDelta? yes : no;

        int log2Size = log2Delta + log2Ndelta == log2Group? log2Group + 1 : log2Group;
        if (log2Size == log2Group) {
            remove = yes;
        }

        short isSubpage = log2Size < pageShifts + LOG2_SIZE_CLASS_GROUP? yes : no;

        int log2DeltaLookup = log2Size < LOG2_MAX_LOOKUP_SIZE ||
                              log2Size == LOG2_MAX_LOOKUP_SIZE && remove == no
                ? log2Delta : no;

        return new short[] {
                (short) index, (short) log2Group, (short) log2Delta,
                (short) nDelta, isMultiPageSize, isSubpage, (short) log2DeltaLookup
        };
    }