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/*
 * Copyright 2018 the original author or authors.
 *
 * 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.
 */
package org.glowroot.agent.impl;

import org.glowroot.agent.shaded.org.checkerframework.checker.nullness.qual.Nullable;

public class GlowrootServiceHolder {

    private static volatile @Nullable GlowrootServiceImpl service;
    private static volatile @Nullable Exception retrievedTooEarlyLocation;

    private GlowrootServiceHolder() {}

    public static @Nullable GlowrootServiceImpl get() {
        if (service == null) {
            retrievedTooEarlyLocation = new Exception();
            return null;
        } else {
            return service;
        }
    }

    public static void set(GlowrootServiceImpl service) {
        GlowrootServiceHolder.service = service;
    }

    public static @Nullable Exception getRetrievedTooEarlyLocation() {
        return retrievedTooEarlyLocation;
    }
}