nextLong() — netty Function Reference

Architecture documentation for the nextLong() function in ThreadLocalRandom.java from the netty codebase.

Function java CommonUtil Internal calls 2

Entity Profile

CommonUtil→ Internal→ nextLong() — netty Function Reference

Dependency Diagram

graph TD
  b776a5b2_2836_d36a_601c_20ffeadcb95d["nextLong()"]
  cad32658_3724_a99b_a2c9_78d6688e22b6["ThreadLocalRandom"]
  b776a5b2_2836_d36a_601c_20ffeadcb95d -->|defined in| cad32658_3724_a99b_a2c9_78d6688e22b6
  bbbaa728_e140_8728_d47e_e3846f949988["next()"]
  b776a5b2_2836_d36a_601c_20ffeadcb95d -->|calls| bbbaa728_e140_8728_d47e_e3846f949988
  50844849_8964_e3f4_f90b_e3092753567c["nextInt()"]
  b776a5b2_2836_d36a_601c_20ffeadcb95d -->|calls| 50844849_8964_e3f4_f90b_e3092753567c
  style b776a5b2_2836_d36a_601c_20ffeadcb95d fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

common/src/main/java/io/netty/util/internal/ThreadLocalRandom.java lines 317–336

    public long nextLong(long n) {
        checkPositive(n, "n");

        // Divide n by two until small enough for nextInt. On each
        // iteration (at most 31 of them but usually much less),
        // randomly choose both whether to include high bit in result
        // (offset) and whether to continue with the lower vs upper
        // half (which makes a difference only if odd).
        long offset = 0;
        while (n >= Integer.MAX_VALUE) {
            int bits = next(2);
            long half = n >>> 1;
            long nextn = ((bits & 2) == 0) ? half : n - half;
            if ((bits & 1) == 0) {
                offset += n - nextn;
            }
            n = nextn;
        }
        return offset + nextInt((int) n);
    }