fsfw/osal/host/MessageQueue.h

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2020-08-18 13:09:15 +02:00
#ifndef FRAMEWORK_OSAL_HOST_MESSAGEQUEUE_H_
#define FRAMEWORK_OSAL_HOST_MESSAGEQUEUE_H_
#include "../../internalError/InternalErrorReporterIF.h"
#include "../../ipc/MessageQueueIF.h"
#include "../../ipc/MessageQueueMessage.h"
#include "../../ipc/MutexIF.h"
#include "../../timemanager/Clock.h"
#include <queue>
#include <memory>
/**
* @brief This class manages sending and receiving of
* message queue messages.
* @details
* Message queues are used to pass asynchronous messages between processes.
* They work like post boxes, where all incoming messages are stored in FIFO
* order. This class creates a new receiving queue and provides methods to fetch
* received messages. Being a child of MessageQueueSender, this class also
* provides methods to send a message to a user-defined or a default destination.
* In addition it also provides a reply method to answer to the queue it
* received its last message from.
*
* The MessageQueue should be used as "post box" for a single owning object.
* So all message queue communication is "n-to-one".
* For creating the queue, as well as sending and receiving messages, the class
* makes use of the operating system calls provided.
*
* Please keep in mind that FreeRTOS offers different calls for message queue
* operations if called from an ISR.
* For now, the system context needs to be switched manually.
* @ingroup osal
* @ingroup message_queue
*/
class MessageQueue : public MessageQueueIF {
friend class MessageQueueSenderIF;
public:
/**
* @brief The constructor initializes and configures the message queue.
* @details
* By making use of the according operating system call, a message queue is
* created and initialized. The message depth - the maximum number of
* messages to be buffered - may be set with the help of a parameter,
* whereas the message size is automatically set to the maximum message
* queue message size. The operating system sets the message queue id, or
* in case of failure, it is set to zero.
* @param message_depth
* The number of messages to be buffered before passing an error to the
* sender. Default is three.
* @param max_message_size
* With this parameter, the maximum message size can be adjusted.
* This should be left default.
*/
MessageQueue(size_t messageDepth = 3,
size_t maxMessageSize = MessageQueueMessage::MAX_MESSAGE_SIZE);
/** Copying message queues forbidden */
MessageQueue(const MessageQueue&) = delete;
MessageQueue& operator=(const MessageQueue&) = delete;
/**
* @brief The destructor deletes the formerly created message queue.
* @details This is accomplished by using the delete call provided
* by the operating system.
*/
virtual ~MessageQueue();
/**
* @brief This operation sends a message to the given destination.
* @details It directly uses the sendMessage call of the MessageQueueSender
* parent, but passes its queue id as "sentFrom" parameter.
* @param sendTo This parameter specifies the message queue id of the
* destination message queue.
* @param message A pointer to a previously created message, which is sent.
* @param ignoreFault If set to true, the internal software fault counter
* is not incremented if queue is full.
*/
ReturnValue_t sendMessage(MessageQueueId_t sendTo,
MessageQueueMessageIF* message, bool ignoreFault = false) override;
/**
* @brief This operation sends a message to the default destination.
* @details As in the sendMessage method, this function uses the
* sendToDefault call of the MessageQueueSender parent class and adds its
* queue id as "sentFrom" information.
* @param message A pointer to a previously created message, which is sent.
*/
ReturnValue_t sendToDefault(MessageQueueMessageIF* message) override;
/**
* @brief This operation sends a message to the last communication partner.
* @details This operation simplifies answering an incoming message by using
* the stored lastPartner information as destination. If there was no
* message received yet (i.e. lastPartner is zero), an error code is returned.
* @param message A pointer to a previously created message, which is sent.
*/
ReturnValue_t reply(MessageQueueMessageIF* message) override;
/**
* @brief With the sendMessage call, a queue message is sent to a
* receiving queue.
* @details
* This method takes the message provided, adds the sentFrom information and
* passes it on to the destination provided with an operating system call.
* The OS's return value is returned.
* @param sendTo This parameter specifies the message queue id to send
* the message to.
* @param message This is a pointer to a previously created message,
* which is sent.
* @param sentFrom The sentFrom information can be set to inject the
* sender's queue id into the message. This variable is set to zero by
* default.
* @param ignoreFault If set to true, the internal software fault counter
* is not incremented if queue is full.
*/
virtual ReturnValue_t sendMessageFrom( MessageQueueId_t sendTo,
MessageQueueMessageIF* message, MessageQueueId_t sentFrom = NO_QUEUE,
bool ignoreFault = false) override;
/**
* @brief The sendToDefault method sends a queue message to the default
* destination.
* @details
* In all other aspects, it works identical to the sendMessage method.
* @param message This is a pointer to a previously created message,
* which is sent.
* @param sentFrom The sentFrom information can be set to inject the
* sender's queue id into the message. This variable is set to zero by
* default.
*/
virtual ReturnValue_t sendToDefaultFrom( MessageQueueMessageIF* message,
MessageQueueId_t sentFrom = NO_QUEUE,
bool ignoreFault = false) override;
/**
* @brief This function reads available messages from the message queue
* and returns the sender.
* @details
* It works identically to the other receiveMessage call, but in addition
* returns the sender's queue id.
* @param message A pointer to a message in which the received data is stored.
* @param receivedFrom A pointer to a queue id in which the sender's id is stored.
*/
ReturnValue_t receiveMessage(MessageQueueMessageIF* message,
MessageQueueId_t *receivedFrom) override;
/**
* @brief This function reads available messages from the message queue.
* @details
* If data is available it is stored in the passed message pointer.
* The message's original content is overwritten and the sendFrom
* information is stored in the lastPartner attribute. Else, the lastPartner
* information remains untouched, the message's content is cleared and the
* function returns immediately.
* @param message A pointer to a message in which the received data is stored.
*/
ReturnValue_t receiveMessage(MessageQueueMessageIF* message) override;
/**
* Deletes all pending messages in the queue.
* @param count The number of flushed messages.
* @return RETURN_OK on success.
*/
ReturnValue_t flush(uint32_t* count) override;
/**
* @brief This method returns the message queue id of the last
* communication partner.
*/
MessageQueueId_t getLastPartner() const override;
/**
* @brief This method returns the message queue id of this class's
* message queue.
*/
MessageQueueId_t getId() const override;
/**
* @brief This method is a simple setter for the default destination.
*/
void setDefaultDestination(MessageQueueId_t defaultDestination) override;
/**
* @brief This method is a simple getter for the default destination.
*/
MessageQueueId_t getDefaultDestination() const override;
bool isDefaultDestinationSet() const override;
ReturnValue_t lockQueue(dur_millis_t lockTimeout);
ReturnValue_t unlockQueue();
protected:
/**
* @brief Implementation to be called from any send Call within
* MessageQueue and MessageQueueSenderIF.
* @details
* This method takes the message provided, adds the sentFrom information and
* passes it on to the destination provided with an operating system call.
* The OS's return value is returned.
* @param sendTo
* This parameter specifies the message queue id to send the message to.
* @param message
* This is a pointer to a previously created message, which is sent.
* @param sentFrom
* The sentFrom information can be set to inject the sender's queue id into
* the message. This variable is set to zero by default.
* @param ignoreFault
* If set to true, the internal software fault counter is not incremented
* if queue is full.
* @param context Specify whether call is made from task or from an ISR.
*/
static ReturnValue_t sendMessageFromMessageQueue(MessageQueueId_t sendTo,
MessageQueueMessageIF* message, MessageQueueId_t sentFrom = NO_QUEUE,
bool ignoreFault=false);
//static ReturnValue_t handleSendResult(BaseType_t result, bool ignoreFault);
private:
std::queue<MessageQueueMessage> messageQueue;
/**
* @brief The class stores the queue id it got assigned.
* If initialization fails, the queue id is set to zero.
*/
MessageQueueId_t mqId = 0;
size_t messageSize = 0;
size_t messageDepth = 0;
MutexIF* queueLock;
bool defaultDestinationSet = false;
MessageQueueId_t defaultDestination = 0;
MessageQueueId_t lastPartner = 0;
};
#endif /* FRAMEWORK_OSAL_HOST_MESSAGEQUEUE_H_ */