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/*
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  See the NOTICE file distributed with this work for additional
 *  information regarding copyright ownership.
 */

package org.seaborne.delta.fuseki;

import org.apache.jena.sys.JenaSubsystemLifecycle;
import org.apache.jena.sys.JenaSystem;

public class InitDeltaFuseki implements JenaSubsystemLifecycle {

    private static volatile boolean initialized = false ;
    private static Object           initLock    = new Object() ;

    @Override
    public void start() {
        init() ;
    }

    @Override
    public void stop() {}

    @Override
    public int level() { return 1000; }

    public static void init() {
        if ( initialized )
            return ;
        synchronized (initLock) {
            if ( initialized ) {
                JenaSystem.logLifecycle("InitDeltaFuseki.init - skip") ;
                return ;
            }
            initialized = true ;
            JenaSystem.logLifecycle("InitDeltaFuseki.init - start") ;

            JenaSystem.logLifecycle("InitDeltaFuseki.init - finish") ;

        }
    }
}