vespaclient-java/src/main/java/com/yahoo/vespaget/Main.java


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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespaget;


import com.yahoo.documentapi.messagebus.loadtypes.LoadTypeSet;
import com.yahoo.vespaclient.ClusterList;

/**
 * The vespa-get tool retrieves documents from a Vespa Document Storage cluster, and prints them to stdout as XML.
 *
 * @author bjorncs
 */
public class Main {

    public static void main(String[] args) {
        try {
            CommandLineOptions options = new CommandLineOptions();
            ClientParameters params = options.parseCommandLineArguments(args);

            if (params.help) {
                options.printHelp();
            } else {
                DocumentRetriever documentRetriever = createDocumentRetriever(params);
                addShutdownHook(documentRetriever);
                documentRetriever.retrieveDocuments();
            }
        } catch (IllegalArgumentException e) {
            System.err.printf("Failed to parse command line arguments: %s.\n", e.getMessage());
        } catch (DocumentRetrieverException e) {
            System.err.printf("Failed to retrieve documents: %s\n", e.getMessage());
        }
    }

    private static void addShutdownHook(DocumentRetriever documentRetriever) {
        Runtime.getRuntime().addShutdownHook(new Thread(documentRetriever::shutdown));
    }

    private static DocumentRetriever createDocumentRetriever(ClientParameters params) {
        return new DocumentRetriever(
                new ClusterList("client"),
                new DocumentAccessFactory(),
                new LoadTypeSet(params.configId),
                params
        );
    }
}