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Elasticsearch subproject :libs:elasticsearch-native

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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the "Elastic License
 * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
 * Public License v 1"; you may not use this file except in compliance with, at
 * your election, the "Elastic License 2.0", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */

package org.elasticsearch.nativeaccess;

import org.elasticsearch.logging.LogManager;
import org.elasticsearch.logging.Logger;
import org.elasticsearch.nativeaccess.lib.NativeLibraryProvider;

class NativeAccessHolder {

    protected static final Logger logger = LogManager.getLogger(NativeAccess.class);

    static final NativeAccess INSTANCE;

    static {
        var libProvider = NativeLibraryProvider.instance();
        var os = System.getProperty("os.name");

        AbstractNativeAccess inst = null;
        try {
            if (os.startsWith("Linux")) {
                inst = new LinuxNativeAccess(libProvider);
            } else if (os.startsWith("Mac OS")) {
                inst = new MacNativeAccess(libProvider);
            } else if (os.startsWith("Windows")) {
                inst = new WindowsNativeAccess(libProvider);
            } else {
                logger.warn("Unsupported OS [" + os + "]. Native methods will be disabled.");
            }
        } catch (LinkageError e) {
            logger.warn("Unable to load native provider. Native methods will be disabled.", e);
        }
        if (inst == null) {
            INSTANCE = new NoopNativeAccess();
        } else {
            logger.info("Using [" + libProvider.getName() + "] native provider and native methods for [" + inst.getName() + "]");
            INSTANCE = inst;
        }
    }
}