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// 
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// 
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// 
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// 
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
// 
package org.eclipse.jetty.util;

/**
 *  ProcessorUtils provides access to runtime info about processors, that may be
 *  overridden by system properties or environment variables.
 *  This can be useful in virtualized environments where the runtime may miss
 *  report the available resources.
 *
 * @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
 */
@Deprecated(since = "2021-05-27")
public class ProcessorUtils {

    public static final String AVAILABLE_PROCESSORS = "JETTY_AVAILABLE_PROCESSORS";

    private static int __availableProcessors = init();

    static int init() {
        String processors = System.getProperty(AVAILABLE_PROCESSORS, System.getenv(AVAILABLE_PROCESSORS));
        if (processors != null) {
            try {
                return Integer.parseInt(processors);
            } catch (NumberFormatException ignored) {
            }
        }
        return Runtime.getRuntime().availableProcessors();
    }

    /**
     * Returns the number of available processors, from System Property "JETTY_AVAILABLE_PROCESSORS",
     * or if not set then from environment variable "JETTY_AVAILABLE_PROCESSORS" or if not set then
     * from {@link Runtime#availableProcessors()}.
     *
     * @return the number of processors
     */
    public static int availableProcessors() {
        return __availableProcessors;
    }

    public static void setAvailableProcessors(int processors) {
        if (processors < 1)
            throw new IllegalArgumentException("Invalid number of processors: " + processors);
        __availableProcessors = processors;
    }
}