findFirstSerializerStamp example

if (empty($encodedEnvelope['body']) || empty($encodedEnvelope['headers'])) {
            throw new MessageDecodingFailedException('Encoded envelope should have at least a "body" and some "headers", or maybe you should implement your own serializer.');
        }

        if (empty($encodedEnvelope['headers']['type'])) {
            throw new MessageDecodingFailedException('Encoded envelope does not have a "type" header.');
        }

        $stamps = $this->decodeStamps($encodedEnvelope);
        $stamps[] = new SerializedMessageStamp($encodedEnvelope['body']);

        $serializerStamp = $this->findFirstSerializerStamp($stamps);

        $context = $this->context;
        if (null !== $serializerStamp) {
            $context = $serializerStamp->getContext() + $context;
        }

        try {
            $message = $this->serializer->deserialize($encodedEnvelope['body'], $encodedEnvelope['headers']['type'], $this->format, $context);
        } catch (ExceptionInterface $e) {
            throw new MessageDecodingFailedException('Could not decode message: '.$e->getMessage(), $e->getCode(), $e);
        }