private void updateMetrics()

in spectator-ext-gc/src/main/java/com/netflix/spectator/gc/GcLogger.java [194:241]
36 lines of code
11 McCabe index (conditional complexity)

  private void updateMetrics(String name, GcInfo info) {
    final Map<String, MemoryUsage> before = info.getMemoryUsageBeforeGc();
    final Map<String, MemoryUsage> after = info.getMemoryUsageAfterGc();

    if (oldGenPoolName != null) {
      final long oldBefore = before.get(oldGenPoolName).getUsed();
      final long oldAfter = after.get(oldGenPoolName).getUsed();
      final long delta = oldAfter - oldBefore;
      if (delta > 0L) {
        PROMOTION_RATE.increment(delta);
      }

      // Shenandoah doesn't report accurate pool sizes for pauses, all numbers are 0. Ignore
      // those updates.
      //
      // Some GCs such as G1 can reduce the old gen size as part of a minor GC. To track the
      // live data size we record the value if we see a reduction in the old gen heap size or
      // after a major GC.
      if (oldAfter > 0L && (oldAfter < oldBefore || HelperFunctions.isOldGcType(name))) {
        LIVE_DATA_SIZE.set(oldAfter);
        final long oldMaxAfter = after.get(oldGenPoolName).getMax();
        MAX_DATA_SIZE.set(oldMaxAfter);
      }
    }

    if (survivorPoolName != null) {
      final long survivorBefore = before.get(survivorPoolName).getUsed();
      final long survivorAfter = after.get(survivorPoolName).getUsed();
      final long delta = survivorAfter - survivorBefore;
      if (delta > 0L) {
        SURVIVOR_RATE.increment(delta);
      }
    }

    if (youngGenPoolName != null) {
      final long youngBefore = before.get(youngGenPoolName).getUsed();
      final long youngAfter = after.get(youngGenPoolName).getUsed();
      // Shenandoah doesn't report accurate pool sizes for pauses, all numbers are 0. Ignore
      // those updates.
      if (youngBefore > 0L) {
        final long delta = youngBefore - youngGenSizeAfter;
        youngGenSizeAfter = youngAfter;
        if (delta > 0L) {
          ALLOCATION_RATE.increment(delta);
        }
      }
    }
  }