/*

 * 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

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package org.graalvm.compiler.hotspot;

import org.graalvm.compiler.serviceprovider.ServiceProvider;

import jdk.vm.ci.common.NativeImageReinitialize;

import jdk.vm.ci.hotspot.HotSpotVMEventListener;

import jdk.vm.ci.runtime.JVMCICompilerFactory;

import jdk.vm.ci.services.JVMCIServiceLocator;

@ServiceProvider(JVMCIServiceLocator.class)

public final class HotSpotGraalJVMCIServiceLocator extends JVMCIServiceLocator {

    /**

     * Holds the state shared between all {@link HotSpotGraalJVMCIServiceLocator} instances. This is

     * necessary as a service provider instance is created each time the service is loaded.

     */

    private static final class Shared {

        static final Shared SINGLETON = new Shared();

        <T> T getProvider(Class<T> service, HotSpotGraalJVMCIServiceLocator locator) {

            if (service == JVMCICompilerFactory.class) {

                return service.cast(new HotSpotGraalCompilerFactory(locator));

            } else if (service == HotSpotVMEventListener.class) {

                if (graalRuntime != null) {

                    return service.cast(new HotSpotGraalVMEventListener(graalRuntime));

                }

            }

            return null;

        }

        @NativeImageReinitialize private HotSpotGraalRuntime graalRuntime;

        /**

         * Notifies this object of the compiler created via {@link HotSpotGraalJVMCIServiceLocator}.

         */

        void onCompilerCreation(HotSpotGraalCompiler compiler) {

            assert this.graalRuntime == null : "only expect a single JVMCICompiler to be created";

            this.graalRuntime = (HotSpotGraalRuntime) compiler.getGraalRuntime();

        }

    }

    @Override

    public <T> T getProvider(Class<T> service) {

        return Shared.SINGLETON.getProvider(service, this);

    }

    /**

     * Notifies this object of the compiler created via {@link HotSpotGraalJVMCIServiceLocator}.

     */

    @SuppressWarnings("static-method")

    void onCompilerCreation(HotSpotGraalCompiler compiler) {

        Shared.SINGLETON.onCompilerCreation(compiler);

    }

}