Package org.apache.plc4x.java.s7.readwrite.optimizer

Class DefaultS7MessageProcessor

java.lang.Object

org.apache.plc4x.java.s7.readwrite.optimizer.DefaultS7MessageProcessor

All Implemented Interfaces:

S7MessageProcessor

public class DefaultS7MessageProcessor
extends Object
implements S7MessageProcessor

While a SetupCommunication message is no problem, when reading or writing data, situations could arise that have to be handled. The following situations have to be handled: - The number of request items is so big, that the resulting PDU would exceed the agreed upon PDU size: The request has to be split up into multiple requests. - If large blocks of data are requested by request items the result of a request could exceed the PDU size: The requests has to be split up into multiple requests where each requests response doesn't exceed the PDU size.

The following optimizations should be implemented: - If blocks are read which are in near proximity to each other it could be better to replace multiple requests by one that includes multiple blocks. - Rearranging the order of request items could reduce the number of needed PDUs.

Field Summary

Fields

Modifier and Type	Field	Description
static int	EMPTY_READ_REQUEST_SIZE
static int	EMPTY_READ_RESPONSE_SIZE
static int	EMPTY_WRITE_REQUEST_SIZE
static int	EMPTY_WRITE_RESPONSE_SIZE

Constructor Summary

Constructors

Constructor	Description
DefaultS7MessageProcessor(AtomicInteger tpduGenerator)

Method Summary

Modifier and Type	Method	Description
Collection<S7MessageRequest>	processRequest(S7MessageRequest request, int pduSize)
S7MessageResponseData	processResponse(S7MessageRequest originalRequest, Map<S7MessageRequest,io.vavr.control.Either<S7MessageResponseData,Throwable>> result)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

EMPTY_READ_REQUEST_SIZE

public static final int EMPTY_READ_REQUEST_SIZE

EMPTY_READ_RESPONSE_SIZE

public static final int EMPTY_READ_RESPONSE_SIZE

EMPTY_WRITE_REQUEST_SIZE

public static final int EMPTY_WRITE_REQUEST_SIZE

EMPTY_WRITE_RESPONSE_SIZE

public static final int EMPTY_WRITE_RESPONSE_SIZE

Constructor Detail

DefaultS7MessageProcessor

public DefaultS7MessageProcessor(AtomicInteger tpduGenerator)

Method Detail

processRequest

public Collection<S7MessageRequest> processRequest(S7MessageRequest request,
                                                   int pduSize)
                                            throws PlcException

Specified by:

processRequest in interface S7MessageProcessor

Throws:

PlcException

processResponse

public S7MessageResponseData processResponse(S7MessageRequest originalRequest,
                                             Map<S7MessageRequest,io.vavr.control.Either<S7MessageResponseData,Throwable>> result)

Specified by:

processResponse in interface S7MessageProcessor