| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| #pragma once |
| |
| #include <pulsar/MessageBuilder.h> |
| |
| #include <functional> |
| |
| namespace pulsar { |
| |
| template <typename T> |
| class TypedMessageBuilder : public MessageBuilder { |
| public: |
| using Encoder = std::function<std::string(const T&)>; |
| using Validator = std::function<void(const char* data, size_t)>; |
| |
| TypedMessageBuilder( |
| Encoder encoder, Validator validator = [](const char*, std::size_t) {}) |
| : encoder_(encoder), validator_(validator) {} |
| |
| TypedMessageBuilder& setValue(const T& value) { |
| setContent(encoder_(value)); |
| if (validator_) { |
| validator_(data(), size()); |
| } |
| return *this; |
| } |
| |
| private: |
| const Encoder encoder_; |
| const Validator validator_; |
| }; |
| |
| template <> |
| class TypedMessageBuilder<std::string> : public MessageBuilder { |
| public: |
| // The validator should throw an exception to indicate the message is corrupted. |
| using Validator = std::function<void(const char* data, size_t)>; |
| |
| TypedMessageBuilder(Validator validator = nullptr) : validator_(validator) {} |
| |
| TypedMessageBuilder& setValue(const std::string& value) { |
| if (validator_) { |
| validator_(value.data(), value.size()); |
| } |
| setContent(value); |
| return *this; |
| } |
| |
| TypedMessageBuilder& setValue(std::string&& value) { |
| if (validator_) { |
| validator_(value.data(), value.size()); |
| } |
| setContent(std::move(value)); |
| return *this; |
| } |
| |
| private: |
| Validator validator_; |
| }; |
| using BytesMessageBuilder = TypedMessageBuilder<std::string>; |
| |
| } // namespace pulsar |