Examples with PlcResponseCode org.apache.plc4x.java.api.types.PlcResponseCode used on opensource projects

Example 31 with PlcResponseCode

use of org.apache.plc4x.java.api.types.PlcResponseCode in project plc4x by apache.

the class ModbusProtocolLogic method read.

@Override
public CompletableFuture<PlcReadResponse> read(PlcReadRequest readRequest) {
    CompletableFuture<PlcReadResponse> future = new CompletableFuture<>();
    DefaultPlcReadRequest request = (DefaultPlcReadRequest) readRequest;
    // Example for sending a request ...
    if (request.getFieldNames().size() == 1) {
        String fieldName = request.getFieldNames().iterator().next();
        ModbusField field = (ModbusField) request.getField(fieldName);
        final ModbusPDU requestPdu = getReadRequestPdu(field);
        int transactionIdentifier = transactionIdentifierGenerator.getAndIncrement();
        // If we've reached the max value for a 16 bit transaction identifier, reset back to 1
        if (transactionIdentifierGenerator.get() == 0xFFFF) {
            transactionIdentifierGenerator.set(1);
        }
        ModbusTcpADU modbusTcpADU = new ModbusTcpADU(transactionIdentifier, unitIdentifier, requestPdu, false);
        RequestTransactionManager.RequestTransaction transaction = tm.startRequest();
        transaction.submit(() -> context.sendRequest(modbusTcpADU).expectResponse(ModbusTcpADU.class, requestTimeout).onTimeout(future::completeExceptionally).onError((p, e) -> future.completeExceptionally(e)).check(p -> ((p.getTransactionIdentifier() == transactionIdentifier) && (p.getUnitIdentifier() == unitIdentifier))).unwrap(ModbusTcpADU::getPdu).handle(responsePdu -> {
            // Try to decode the response data based on the corresponding request.
            PlcValue plcValue = null;
            PlcResponseCode responseCode;
            // Check if the response was an error response.
            if (responsePdu instanceof ModbusPDUError) {
                ModbusPDUError errorResponse = (ModbusPDUError) responsePdu;
                responseCode = getErrorCode(errorResponse);
            } else {
                try {
                    plcValue = toPlcValue(requestPdu, responsePdu, field.getDataType());
                    responseCode = PlcResponseCode.OK;
                } catch (ParseException e) {
                    // Add an error response code ...
                    responseCode = PlcResponseCode.INTERNAL_ERROR;
                }
            }
            // Prepare the response.
            PlcReadResponse response = new DefaultPlcReadResponse(request, Collections.singletonMap(fieldName, new ResponseItem<>(responseCode, plcValue)));
            // Pass the response back to the application.
            future.complete(response);
            // Finish the request-transaction.
            transaction.endRequest();
        }));
    } else {
        future.completeExceptionally(new PlcRuntimeException("Modbus only supports single filed requests"));
    }
    return future;
}