org.glowroot.agent.api.internal.GlowrootServiceHolder Maven / Gradle / Ivy
/*
* 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.api.internal;
import org.checkerframework.checker.nullness.qual.Nullable;
public class GlowrootServiceHolder {
private static volatile @Nullable GlowrootService service;
private static volatile @Nullable Exception retrievedTooEarlyLocation;
private GlowrootServiceHolder() {}
public static GlowrootService get() {
if (service == null) {
retrievedTooEarlyLocation = new Exception();
return NopGlowrootService.INSTANCE;
} else {
return service;
}
}
public static void set(GlowrootService service) {
GlowrootServiceHolder.service = service;
}
public static @Nullable Exception getRetrievedTooEarlyLocation() {
return retrievedTooEarlyLocation;
}
}