| // 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. |
| |
| #ifndef __COMMON_HEARTBEATER_HPP__ |
| #define __COMMON_HEARTBEATER_HPP__ |
| |
| #include <string> |
| |
| #include <process/delay.hpp> |
| #include <process/http.hpp> |
| #include <process/process.hpp> |
| #include <process/owned.hpp> |
| |
| #include <stout/duration.hpp> |
| #include <stout/lambda.hpp> |
| #include <stout/option.hpp> |
| |
| #include "common/http.hpp" |
| |
| namespace mesos { |
| namespace internal { |
| |
| // This process periodically sends heartbeats to a given HTTP streaming |
| // response. The optional delay parameter is used to specify the delay |
| // period before sending the first heartbeat. The optional callback parameter |
| // will be called each time a heartbeat is sent. |
| template<typename Message, typename Event> |
| class ResponseHeartbeaterProcess |
| : public process::Process<ResponseHeartbeaterProcess<Message, Event>> |
| { |
| public: |
| ResponseHeartbeaterProcess( |
| const std::string& _logMessage, |
| const Message& _heartbeatMessage, |
| const StreamingHttpConnection<Event>& _connection, |
| const Duration& _interval, |
| const Option<Duration>& _delay = None(), |
| const Option<lambda::function<void()>>& _callback = None()) |
| : process::ProcessBase(process::ID::generate("heartbeater")), |
| logMessage(_logMessage), |
| heartbeatMessage(_heartbeatMessage), |
| connection(_connection), |
| interval(_interval), |
| delay(_delay), |
| callback(_callback) {} |
| |
| protected: |
| void initialize() override |
| { |
| if (delay.isSome()) { |
| process::delay( |
| delay.get(), |
| this, |
| &ResponseHeartbeaterProcess::heartbeat); |
| } else { |
| heartbeat(); |
| } |
| } |
| |
| private: |
| void heartbeat() |
| { |
| // Only send a heartbeat if the connection is not closed. |
| if (connection.closed().isPending()) { |
| VLOG(2) << "Sending heartbeat to " << logMessage; |
| |
| if (callback.isSome()) { |
| callback.get()(); |
| } |
| |
| connection.send(heartbeatMessage); |
| } |
| |
| process::delay(interval, this, &ResponseHeartbeaterProcess::heartbeat); |
| } |
| |
| const std::string logMessage; |
| const Message heartbeatMessage; |
| StreamingHttpConnection<Event> connection; |
| const Duration interval; |
| const Option<Duration> delay; |
| const Option<lambda::function<void()>> callback; |
| }; |
| |
| |
| template<typename Message, typename Event> |
| class ResponseHeartbeater |
| { |
| public: |
| ResponseHeartbeater( |
| const std::string& _logMessage, |
| const Message& _heartbeatMessage, |
| const StreamingHttpConnection<Event>& _connection, |
| const Duration& _interval, |
| const Option<Duration>& _delay = None(), |
| const Option<lambda::function<void()>>& _callback = None()) |
| : process(new ResponseHeartbeaterProcess<Message, Event>( |
| _logMessage, |
| _heartbeatMessage, |
| _connection, |
| _interval, |
| _delay, |
| _callback)) |
| { |
| process::spawn(process.get()); |
| } |
| |
| ~ResponseHeartbeater() |
| { |
| process::terminate(process.get()); |
| process::wait(process.get()); |
| } |
| |
| // Not copyable, not assignable. |
| ResponseHeartbeater(const ResponseHeartbeater&) = delete; |
| ResponseHeartbeater& operator=(const ResponseHeartbeater&) = delete; |
| |
| private: |
| const process::Owned<ResponseHeartbeaterProcess<Message, Event>> process; |
| }; |
| |
| } // namespace internal { |
| } // namespace mesos { |
| |
| #endif // __COMMON_HEARTBEATER_HPP__ |