fsfw/ipc/MessageQueueIF.h

#ifndef FSFW_IPC_MESSAGEQUEUEIF_H_
#define FSFW_IPC_MESSAGEQUEUEIF_H_

#include "messageQueueDefinitions.h"
#include "MessageQueueMessageIF.h"
#include "../returnvalues/HasReturnvaluesIF.h"

#include <cstdint>


// COULDDO: We could support blocking calls
// semaphores are being implemented, which makes this idea even more iteresting.

/**
 * @defgroup message_queue Message Queue
 * @brief Message Queue related software components
 */
class MessageQueueIF {
public:
	static const MessageQueueId_t NO_QUEUE = 0;

	static const uint8_t INTERFACE_ID = CLASS_ID::MESSAGE_QUEUE_IF;
	//! No new messages on the queue
	static const ReturnValue_t EMPTY = MAKE_RETURN_CODE(1);
	//! No space left for more messages
	static const ReturnValue_t FULL = MAKE_RETURN_CODE(2);
	//! Returned if a reply method was called without partner
	static const ReturnValue_t NO_REPLY_PARTNER = MAKE_RETURN_CODE(3);
	//! Returned if the target destination is invalid.
	static constexpr ReturnValue_t DESTINATION_INVALID = MAKE_RETURN_CODE(4);

	virtual ~MessageQueueIF() {}
	/**
	 * @brief	This operation sends a message to the last communication partner.
	 * @details
	 * This operation simplifies answering an incoming message by using the
	 * stored lastParnter 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.
	 * @return
	 * -@c RETURN_OK if ok
	 * -@c NO_REPLY_PARTNER Should return NO_REPLY_PARTNER if partner was found.
	 */
	virtual ReturnValue_t reply(MessageQueueMessageIF* message) = 0;

	/**
	 * @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.
	 */
	virtual ReturnValue_t receiveMessage(MessageQueueMessageIF* message,
			MessageQueueId_t *receivedFrom) = 0;

	/**
	 * @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 theblastPartner 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.
	 * @return -@c RETURN_OK on success
	 *         -@c MessageQueueIF::EMPTY if queue is empty
	 */
	virtual ReturnValue_t receiveMessage(MessageQueueMessageIF* message) = 0;
	/**
	 * Deletes all pending messages in the queue.
	 * @param count The number of flushed messages.
	 * @return RETURN_OK on success.
	 */
	virtual ReturnValue_t flush(uint32_t* count) = 0;
	/**
	 * @brief	This method returns the message queue
	 *          id of the last communication partner.
	 */
	virtual MessageQueueId_t getLastPartner() const = 0;
	/**
	 * @brief	This method returns the message queue
	 *          id of this class's message queue.
	 */
	virtual MessageQueueId_t getId() const = 0;

	/**
	 * @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 returnvalue 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 (if implemented).
	 * @return -@c RETURN_OK on success
	 *         -@c MessageQueueIF::FULL if queue is full
	 */
	virtual ReturnValue_t sendMessageFrom( MessageQueueId_t sendTo,
			MessageQueueMessageIF* message, MessageQueueId_t sentFrom,
			bool ignoreFault = false ) = 0;

	/**
	 * @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.
	 */
	virtual ReturnValue_t sendMessage( MessageQueueId_t sendTo,
			MessageQueueMessageIF* message, bool ignoreFault = false ) = 0;

	/**
	 * @brief	The sendToDefaultFrom 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.
	 * @return -@c RETURN_OK on success
	 *         -@c MessageQueueIF::FULL if queue is full
	 */
	virtual ReturnValue_t sendToDefaultFrom( MessageQueueMessageIF* message,
			MessageQueueId_t sentFrom, bool ignoreFault = false ) = 0;
	/**
	 * @brief	This operation sends a message to the default destination.
	 * @details
	 * As in the sendMessage method, this function uses the sendToDefault
	 * call of the Implementation class and adds its queue id as
	 * "sentFrom" information.
	 * @param message	A pointer to a previously created message, which is sent.
	 * @return -@c RETURN_OK on success
	 *         -@c MessageQueueIF::FULL if queue is full
	 */
	virtual ReturnValue_t sendToDefault( MessageQueueMessageIF* message )  = 0;
	/**
	 * @brief	This method is a simple setter for the default destination.
	 */
	virtual void setDefaultDestination(MessageQueueId_t defaultDestination) = 0;
	/**
	 * @brief	This method is a simple getter for the default destination.
	 */
	virtual MessageQueueId_t getDefaultDestination() const = 0;

	virtual bool isDefaultDestinationSet() const = 0;
};



#endif /* FSFW_IPC_MESSAGEQUEUEIF_H_ */