ReadAttributesExample.java

/*
 * Copyright (c) 2017 Kevin Herron
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v1.0 which accompany this distribution.
 *
 * The Eclipse Public License is available at
 *   http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 *   http://www.eclipse.org/org/documents/edl-v10.html.
 */

package org.eclipse.milo.examples.client;

import java.util.List;
import java.util.concurrent.CompletableFuture;

import org.eclipse.milo.opcua.sdk.client.OpcUaClient;
import org.eclipse.milo.opcua.stack.core.AttributeId;
import org.eclipse.milo.opcua.stack.core.Identifiers;
import org.eclipse.milo.opcua.stack.core.types.builtin.DataValue;
import org.eclipse.milo.opcua.stack.core.types.builtin.QualifiedName;
import org.eclipse.milo.opcua.stack.core.types.enumerated.TimestampsToReturn;
import org.eclipse.milo.opcua.stack.core.types.structured.ReadResponse;
import org.eclipse.milo.opcua.stack.core.types.structured.ReadValueId;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static com.google.common.collect.Lists.newArrayList;

public class ReadAttributeExample implements ClientExample {

    public static void main(String[] args) throws Exception {
        ReadAttributeExample example = new ReadAttributeExample();

        new ClientExampleRunner(example).run();
    }

    private final Logger logger = LoggerFactory.getLogger(getClass());

    @Override
    public void run(OpcUaClient client, CompletableFuture<OpcUaClient> future) throws Exception {
        // synchronous connect
        client.connect().get();

        // Read BrowseName and DisplayName attributes of CurrentTime node
        List<ReadValueId> readValueIds = newArrayList(
            new ReadValueId(
                Identifiers.Server_ServerStatus_CurrentTime,
                AttributeId.BrowseName.uid(),
                null,
                QualifiedName.NULL_VALUE),
            new ReadValueId(
                Identifiers.Server_ServerStatus_CurrentTime,
                AttributeId.DisplayName.uid(),
                null,
                QualifiedName.NULL_VALUE)
        );

        ReadResponse response = client.read(0.0, TimestampsToReturn.Server, readValueIds).get();

        DataValue[] results = response.getResults();
        assert results != null;

        logger.info("BrowseName={} DisplayName={}",
            results[0].getValue().getValue(),
            results[1].getValue().getValue()
        );
    }

}