protected void convertChunk()

in oap-server/server-library/library-async-profiler-jfr-parser/src/main/java/org/apache/skywalking/oap/server/library/jfr/parser/JFRToFrameTree.java [56:114]
55 lines of code
16 McCabe index (conditional complexity)

    protected void convertChunk() throws IOException {
        Map<JFREventType, EventAggregator> event2aggMap = collectMultiEvents();
        for (Map.Entry<JFREventType, EventAggregator> entry : event2aggMap.entrySet()) {
            JFREventType event = entry.getKey();
            EventAggregator agg = entry.getValue();
            FrameTreeBuilder frameTreeBuilder = event2builderMap.computeIfAbsent(event, eventType -> new FrameTreeBuilder());

            agg.forEach(new EventAggregator.Visitor() {
                final CallStack stack = new CallStack();
                final double ticksToNanos = 1e9 / jfr.ticksPerSec;
                final boolean scale = JFREventType.isLockSample(event) && ticksToNanos != 1.0;

                @Override
                public void visit(Event event, long value) {
                    StackTrace stackTrace = jfr.stackTraces.get(event.stackTraceId);
                    if (stackTrace != null) {
                        long[] methods = stackTrace.methods;
                        byte[] types = stackTrace.types;
                        int[] locations = stackTrace.locations;

                        if (args.isThreads()) {
                            stack.push(getThreadName(event.tid), TYPE_NATIVE);
                        }
                        if (args.isClassify()) {
                            Classifier.Category category = getCategory(stackTrace);
                            stack.push(category.getTitle(), category.getType());
                        }
                        for (int i = methods.length; --i >= 0; ) {
                            String methodName = getMethodName(methods[i], types[i]);
                            int location;
                            if ((location = locations[i] >>> 16) != 0) {
                                methodName += ":" + location;
                            }
                            stack.push(methodName, types[i]);
                        }
                        if (event instanceof AllocationSample) {
                            AllocationSample allocationSample = (AllocationSample) event;
                            if (allocationSample.classId != 0) {
                                stack.push(getClassName(allocationSample.classId), ((AllocationSample) event).tlabSize == 0 ? TYPE_KERNEL : TYPE_INLINED);
                            }
                        } else if (event instanceof LiveObject) {
                            LiveObject liveObject = (LiveObject) event;
                            if (liveObject.classId != 0) {
                                stack.push(getClassName(liveObject.classId), TYPE_INLINED);
                            }
                        } else if (event instanceof ContendedLock) {
                            ContendedLock contendedLock = (ContendedLock) event;
                            if (contendedLock.classId != 0) {
                                stack.push(getClassName(contendedLock.classId), TYPE_INLINED);
                            }
                        }

                        frameTreeBuilder.addSample(stack, scale ? (long) (value * ticksToNanos) : value);
                        stack.clear();
                    }
                }
            });
        }
    }