/*
 * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.graal.api;


public class Graal {

    private static GraalRuntime runtime;
    private static volatile boolean initialized;

    private static native GraalRuntime initializeRuntime();

    public static GraalRuntime getRuntime() {
        ensureInitialized();
        return runtime;
    }

    public static boolean hasRuntime() {
        return getRuntime() != null;
    }

    private static void ensureInitialized() {
        boolean wasInitialized = initialized;
        if (!wasInitialized) {
            synchronized (Graal.class) {
                if (!initialized) {
                    try {
                        runtime = initializeRuntime();
                    } catch (UnsatisfiedLinkError e) {
                        runtime = null;
                    }
                    initialized = true;
                }
            }
        }
    }
}