Function bufferResourceTiming

lib/internal/perf/observe.js:437–469

* Add the resource timing entry to the global buffer if the buffer size is not * exceeding the buffer limit, or dispatch a buffer full event on the global * performance object. * * See also https://www.w3.org/TR/resource-timing-2/#dfn-add-a-performanceresourcetiming-entry

(entry)

 * See also https://www.w3.org/TR/resource-timing-2/#dfn-add-a-performanceresourcetiming-entry
 */
function bufferResourceTiming(entry) {
  if (resourceTimingBuffer.length < resourceTimingBufferSizeLimit && !resourceTimingBufferFullPending) {
    ArrayPrototypePush(resourceTimingBuffer, entry);
    return;
  }

  if (!resourceTimingBufferFullPending) {
    resourceTimingBufferFullPending = true;
    setImmediate(() => {
      while (resourceTimingSecondaryBuffer.length > 0) {
        const excessNumberBefore = resourceTimingSecondaryBuffer.length;
        dispatchBufferFull('resourcetimingbufferfull');

        // Calculate the number of items to be pushed to the global buffer.
        const numbersToPreserve = MathMax(
          MathMin(resourceTimingBufferSizeLimit - resourceTimingBuffer.length, resourceTimingSecondaryBuffer.length),
          0,
        );
        const excessNumberAfter = resourceTimingSecondaryBuffer.length - numbersToPreserve;
        for (let idx = 0; idx < numbersToPreserve; idx++) {
          ArrayPrototypePush(resourceTimingBuffer, resourceTimingSecondaryBuffer[idx]);
        }

        if (excessNumberBefore <= excessNumberAfter) {
          resourceTimingSecondaryBuffer = [];
        }
      }
      resourceTimingBufferFullPending = false;
    });
  }

  ArrayPrototypePush(resourceTimingSecondaryBuffer, entry);
}

// https://w3c.github.io/resource-timing/#dom-performance-setresourcetimingbuffersize
function setResourceTimingBufferSize(maxSize) {