allocate() — netty Function Reference

Architecture documentation for the allocate() function in PoolSubpage.java from the netty codebase.

Function java Buffer Search calls 3

Entity Profile

Buffer→ Search→ allocate() — netty Function Reference

Dependency Diagram

graph TD
  a871ec93_3c33_5694_cdf3_d9e756a2556c["allocate()"]
  a6a571ea_fcf9_6eda_c073_f8d61fa999a3["PoolSubpage"]
  a871ec93_3c33_5694_cdf3_d9e756a2556c -->|defined in| a6a571ea_fcf9_6eda_c073_f8d61fa999a3
  c43f611b_3492_7c52_e24a_c4a5fff99a83["getNextAvail()"]
  a871ec93_3c33_5694_cdf3_d9e756a2556c -->|calls| c43f611b_3492_7c52_e24a_c4a5fff99a83
  ece8cfac_ec12_b1cc_40c7_2768a79012a6["removeFromPool()"]
  a871ec93_3c33_5694_cdf3_d9e756a2556c -->|calls| ece8cfac_ec12_b1cc_40c7_2768a79012a6
  d5c6d0c4_a94d_8d37_d027_53b9442f2238["toHandle()"]
  a871ec93_3c33_5694_cdf3_d9e756a2556c -->|calls| d5c6d0c4_a94d_8d37_d027_53b9442f2238
  style a871ec93_3c33_5694_cdf3_d9e756a2556c fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

buffer/src/main/java/io/netty/buffer/PoolSubpage.java lines 90–112

    long allocate() {
        if (numAvail == 0 || !doNotDestroy) {
            return -1;
        }

        final int bitmapIdx = getNextAvail();
        if (bitmapIdx < 0) {
            removeFromPool(); // Subpage appear to be in an invalid state. Remove to prevent repeated errors.
            throw new AssertionError("No next available bitmap index found (bitmapIdx = " + bitmapIdx + "), " +
                    "even though there are supposed to be (numAvail = " + numAvail + ") " +
                    "out of (maxNumElems = " + maxNumElems + ") available indexes.");
        }
        int q = bitmapIdx >>> 6;
        int r = bitmapIdx & 63;
        assert (bitmap[q] >>> r & 1) == 0;
        bitmap[q] |= 1L << r;

        if (-- numAvail == 0) {
            removeFromPool();
        }

        return toHandle(bitmapIdx);
    }