public List describeInContext()

in aws-xray-recorder-sdk-core/src/main/java/com/amazonaws/xray/strategy/DefaultThrowableSerializationStrategy.java [119:182]
43 lines of code
8 McCabe index (conditional complexity)

    public List<ThrowableDescription> describeInContext(
        @Nullable Entity entity,
        Throwable throwable,
        List<Subsegment> subsegments
    ) {
        List<ThrowableDescription> result = new ArrayList<>();
        IdGenerator idGenerator;

        // We could fall back on ThreadLocalStorage#get if we were confident that no `SegmentContext` implementations
        // override the default get/setTraceEntity implementations, but we can't make that guarantee.
        if (entity != null) {
            idGenerator = entity.getCreator().getIdGenerator();
        } else if (!subsegments.isEmpty()) {
            idGenerator = subsegments.get(0).getCreator().getIdGenerator();
        } else {
            idGenerator = AWSXRay.getGlobalRecorder().getIdGenerator();
        }

        /*
         * Visit each node in the cause chain. For each node:
         *  Determine if it has already been described in one of the child subsegments' causes. If so, link there.
         *  Otherwise, describe it and add it to the result.
         */

        ThrowableDescription description = new ThrowableDescription();

        Optional<ThrowableDescription> exceptionReferenced = referenceInChildren(throwable, subsegments);

        if (exceptionReferenced.isPresent()) {
            //already described, we can link to this one by ID. Get the id from the child's Throwabledescription (if it has one).
            //Use the cause otherwise.

            ThrowableDescription exception = exceptionReferenced.get();
            description.setCause(exception.getId() != null ? exception.getId() : exception.getCause());
            description.setThrowable(throwable);
            result.add(description);
            return result;
        } else {
            description = describeThrowable(throwable, idGenerator.newEntityId());
            result.add(description);
        }

        Throwable nextNode = throwable.getCause();
        while (null != nextNode) {
            final Throwable currentNode = nextNode;
            exceptionReferenced = referenceInChildren(currentNode, subsegments);

            if (exceptionReferenced.isPresent()) {
                description.setCause(null == exceptionReferenced.get().getId() ?
                                     exceptionReferenced.get().getCause() : exceptionReferenced.get().getId());
            } else {
                //Link it, and start a new description
                String newId = idGenerator.newEntityId();
                description.setCause(newId);

                description = describeThrowable(currentNode, newId);
            }

            result.add(description);
            nextNode = nextNode.getCause();
        }

        return result;
    }