| /* |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (the |
| "License"); you may not use this file except in compliance |
| with the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, |
| software distributed under the License is distributed on an |
| "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| KIND, either express or implied. See the License for the |
| specific language governing permissions and limitations |
| under the License. |
| */ |
| package org.apache.plc4x.java.examples.helloplc4x; |
| |
| import org.apache.plc4x.java.PlcDriverManager; |
| import org.apache.plc4x.java.api.PlcConnection; |
| import org.apache.plc4x.java.api.exceptions.PlcRuntimeException; |
| import org.apache.plc4x.java.api.messages.PlcReadRequest; |
| import org.apache.plc4x.java.api.messages.PlcReadResponse; |
| import org.apache.plc4x.java.api.types.PlcResponseCode; |
| import org.apache.plc4x.java.api.value.PlcValue; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.concurrent.CompletionStage; |
| import java.util.concurrent.TimeUnit; |
| |
| public class HelloPlc4x { |
| |
| private static final Logger logger = LoggerFactory.getLogger(HelloPlc4x.class); |
| |
| /** |
| * Example code do demonstrate using PLC4X. |
| * |
| * @param args ignored. |
| */ |
| public static void main(String[] args) throws Exception { |
| CliOptions options = CliOptions.fromArgs(args); |
| if (options == null) { |
| CliOptions.printHelp(); |
| // Could not parse. |
| System.exit(1); |
| } |
| |
| // Establish a connection to the plc using the url provided as first argument |
| try (PlcConnection plcConnection = new PlcDriverManager().getConnection(options.getConnectionString())) { |
| |
| // Check if this connection support reading of data. |
| if (!plcConnection.getMetadata().canRead()) { |
| logger.error("This connection doesn't support reading."); |
| return; |
| } |
| |
| // Create a new read request: |
| // - Give the single item requested the alias name "value" |
| PlcReadRequest.Builder builder = plcConnection.readRequestBuilder(); |
| for (int i = 0; i < options.getFieldAddress().length; i++) { |
| builder.addItem("value-" + options.getFieldAddress()[i], options.getFieldAddress()[i]); |
| } |
| PlcReadRequest readRequest = builder.build(); |
| |
| ////////////////////////////////////////////////////////// |
| // Read synchronously ... |
| // NOTICE: the ".get()" immediately lets this thread pause until |
| // the response is processed and available. |
| logger.info("Synchronous request ..."); |
| PlcReadResponse syncResponse = readRequest.execute().get(); |
| // Simply iterating over the field names returned in the response. |
| printResponse(syncResponse); |
| |
| /*PlcValue asPlcValue = syncResponse.getAsPlcValue(); |
| System.out.println(asPlcValue.toString());*/ |
| |
| ////////////////////////////////////////////////////////// |
| // Read asynchronously ... |
| // Register a callback executed as soon as a response arrives. |
| /*logger.info("Asynchronous request ..."); |
| CompletionStage<? extends PlcReadResponse> asyncResponse = readRequest.execute(); |
| asyncResponse.whenComplete((readResponse, throwable) -> { |
| if (readResponse != null) { |
| printResponse(readResponse); |
| } else { |
| logger.error("An error occurred: " + throwable.getMessage(), throwable); |
| } |
| });*/ |
| |
| // Give the async request a little time... |
| TimeUnit.MILLISECONDS.sleep(1000); |
| plcConnection.close(); |
| System.exit(0); |
| } |
| } |
| |
| private static void printResponse(PlcReadResponse response) { |
| for (String fieldName : response.getFieldNames()) { |
| if (response.getResponseCode(fieldName) == PlcResponseCode.OK) { |
| int numValues = response.getNumberOfValues(fieldName); |
| // If it's just one element, output just one single line. |
| if (numValues == 1) { |
| logger.info("Value[{}]: {}", fieldName, response.getObject(fieldName)); |
| } |
| // If it's more than one element, output each in a single row. |
| else { |
| logger.info("Value[{}]:", fieldName); |
| for (int i = 0; i < numValues; i++) { |
| logger.info(" - {}", response.getObject(fieldName, i)); |
| } |
| } |
| } |
| // Something went wrong, to output an error message instead. |
| else { |
| logger.error("Error[{}]: {}", fieldName, response.getResponseCode(fieldName).name()); |
| } |
| } |
| } |
| |
| } |