fsfw/ipc/MessageQueueIF.h

147 lines
6.3 KiB
C++

#ifndef FRAMEWORK_IPC_MESSAGEQUEUEIF_H_
#define FRAMEWORK_IPC_MESSAGEQUEUEIF_H_
// 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
*/
#include <framework/ipc/MessageQueueMessage.h>
#include <framework/ipc/MessageQueueSenderIF.h>
#include <framework/returnvalues/HasReturnvaluesIF.h>
class MessageQueueIF {
public:
static const MessageQueueId_t NO_QUEUE = MessageQueueMessageIF::NO_QUEUE; //!< Ugly hack.
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);
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 RETURN_OK if ok
* @return 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 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 (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 /* FRAMEWORK_IPC_MESSAGEQUEUEIF_H_ */