johnzon-jaxrs/src/main/java/org/apache/johnzon/jaxrs/ConfigurableJohnzonProvider.java [58:108]:
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    private MapperBuilder builder = new MapperBuilder();
    private List<String> ignores;

    // runtime
    private AtomicReference<JohnzonProvider<T>> delegate = new AtomicReference<JohnzonProvider<T>>();

    private JohnzonProvider<T> instance() {
        JohnzonProvider<T> instance;
        do {
            instance = delegate.get();
            if (builder != null && delegate.compareAndSet(null, new JohnzonProvider<T>(builder.build(), ignores))) {
                // reset build instances
                builder = null;
                ignores = null;
            }
        } while (instance == null);
        return instance;
    }

    @Override
    public boolean isReadable(final Class<?> rawType, final Type genericType,
                              final Annotation[] annotations, final MediaType mediaType) {
        return instance().isReadable(rawType, genericType, annotations, mediaType);
    }

    @Override
    public T readFrom(final Class<T> rawType, final Type genericType,
                      final Annotation[] annotations, final MediaType mediaType,
                      final MultivaluedMap<String, String> httpHeaders,
                      final InputStream entityStream) throws IOException {
        return instance().readFrom(rawType, genericType, annotations, mediaType, httpHeaders, entityStream);
    }

    @Override
    public long getSize(final T t, final Class<?> rawType, final Type genericType,
                        final Annotation[] annotations, final MediaType mediaType) {
        return instance().getSize(t, rawType, genericType, annotations, mediaType);
    }

    @Override
    public boolean isWriteable(final Class<?> rawType, final Type genericType,
                               final Annotation[] annotations, final MediaType mediaType) {
        return instance().isWriteable(rawType, genericType, annotations, mediaType);
    }

    @Override
    public void writeTo(final T t, final Class<?> rawType, final Type genericType,
                        final Annotation[] annotations, final MediaType mediaType,
                        final MultivaluedMap<String, Object> httpHeaders,
                        final OutputStream entityStream) throws IOException {
        instance().writeTo(t, rawType, genericType, annotations, mediaType, httpHeaders, entityStream);
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johnzon-jaxrs/src/main/java/org/apache/johnzon/jaxrs/WildcardConfigurableJohnzonProvider.java [59:109]:
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    private MapperBuilder builder = new MapperBuilder();
    private List<String> ignores;

    // runtime
    private AtomicReference<JohnzonProvider<T>> delegate = new AtomicReference<JohnzonProvider<T>>();

    private JohnzonProvider<T> instance() {
        JohnzonProvider<T> instance;
        do {
            instance = delegate.get();
            if (builder != null && delegate.compareAndSet(null, new JohnzonProvider<T>(builder.build(), ignores))) {
                // reset build instances
                builder = null;
                ignores = null;
            }
        } while (instance == null);
        return instance;
    }

    @Override
    public boolean isReadable(final Class<?> rawType, final Type genericType,
                              final Annotation[] annotations, final MediaType mediaType) {
        return instance().isReadable(rawType, genericType, annotations, mediaType);
    }

    @Override
    public T readFrom(final Class<T> rawType, final Type genericType,
                      final Annotation[] annotations, final MediaType mediaType,
                      final MultivaluedMap<String, String> httpHeaders,
                      final InputStream entityStream) throws IOException {
        return instance().readFrom(rawType, genericType, annotations, mediaType, httpHeaders, entityStream);
    }

    @Override
    public long getSize(final T t, final Class<?> rawType, final Type genericType,
                        final Annotation[] annotations, final MediaType mediaType) {
        return instance().getSize(t, rawType, genericType, annotations, mediaType);
    }

    @Override
    public boolean isWriteable(final Class<?> rawType, final Type genericType,
                               final Annotation[] annotations, final MediaType mediaType) {
        return instance().isWriteable(rawType, genericType, annotations, mediaType);
    }

    @Override
    public void writeTo(final T t, final Class<?> rawType, final Type genericType,
                        final Annotation[] annotations, final MediaType mediaType,
                        final MultivaluedMap<String, Object> httpHeaders,
                        final OutputStream entityStream) throws IOException {
        instance().writeTo(t, rawType, genericType, annotations, mediaType, httpHeaders, entityStream);
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