fsfw/osal/FreeRTOS/MessageQueue.h

#ifndef FSFW_OSAL_FREERTOS_MESSAGEQUEUE_H_
#define FSFW_OSAL_FREERTOS_MESSAGEQUEUE_H_

#include "TaskManagement.h"

#include "../../internalError/InternalErrorReporterIF.h"
#include "../../ipc/MessageQueueIF.h"
#include "../../ipc/MessageQueueMessageIF.h"
#include "../../ipc/MessageQueueMessage.h"

#include "FreeRTOS.h"
#include "queue.h"


/**
 * @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();

    /**
     * This function is used to switch the call context. This has to be called
     * if a message is sent or received from an ISR!
     * @param callContext
     */
    void switchSystemContext(CallContext callContext);

    /** MessageQueueIF implementation */
    ReturnValue_t sendMessage(MessageQueueId_t sendTo,
            MessageQueueMessageIF* message, bool ignoreFault = false) override;

    ReturnValue_t sendToDefault(MessageQueueMessageIF* message) override;

    ReturnValue_t reply(MessageQueueMessageIF* message) override;
    virtual ReturnValue_t sendMessageFrom(MessageQueueId_t sendTo,
            MessageQueueMessageIF* message,
            MessageQueueId_t sentFrom = NO_QUEUE,
            bool ignoreFault = false) override;

    virtual ReturnValue_t sendToDefaultFrom( MessageQueueMessageIF* message,
            MessageQueueId_t sentFrom = NO_QUEUE,
            bool ignoreFault = false) override;

    ReturnValue_t receiveMessage(MessageQueueMessageIF* message,
            MessageQueueId_t *receivedFrom) override;

    ReturnValue_t receiveMessage(MessageQueueMessageIF* message) override;

    ReturnValue_t flush(uint32_t* count) override;

    MessageQueueId_t getLastPartner() const override;

    MessageQueueId_t getId() const override;

    void setDefaultDestination(MessageQueueId_t defaultDestination) override;

    MessageQueueId_t getDefaultDestination() const override;

    bool isDefaultDestinationSet() const override;

    QueueHandle_t getNativeQueueHandle();

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, CallContext callContext = CallContext::TASK);

    static ReturnValue_t handleSendResult(BaseType_t result, bool ignoreFault);

private:
    bool defaultDestinationSet = false;
    QueueHandle_t handle;
    MessageQueueId_t queueId = MessageQueueIF::NO_QUEUE;

    MessageQueueId_t defaultDestination = MessageQueueIF::NO_QUEUE;
    MessageQueueId_t lastPartner = MessageQueueIF::NO_QUEUE;
    const size_t maxMessageSize;
    //! Stores the current system context
    CallContext callContext =  CallContext::TASK;
};

#endif /* FSFW_OSAL_FREERTOS_MESSAGEQUEUE_H_ */