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/*
 * Copyright 2012-2015 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.weaving;

import org.glowroot.markers.UsedByGeneratedBytecode;

@UsedByGeneratedBytecode
public class AdviceFlowOuterHolder {

    // it is faster to use a mutable holder object and always perform ThreadLocal.get() and never
    // use ThreadLocal.set(), because the value is more likely to be found in the ThreadLocalMap
    // direct hash slot and avoid the slow path ThreadLocalMap.getEntryAfterMiss()
    @SuppressWarnings("nullness:type.argument.type.incompatible")
    private final ThreadLocal topHolder = new ThreadLocal() {
        @Override
        protected AdviceFlowHolder initialValue() {
            return new AdviceFlowHolder(true);
        }
    };

    @UsedByGeneratedBytecode
    public static AdviceFlowOuterHolder create() {
        return new AdviceFlowOuterHolder();
    }

    private AdviceFlowOuterHolder() {}

    @UsedByGeneratedBytecode
    public AdviceFlowHolder getInnerHolder() {
        return topHolder.get();
    }

    @UsedByGeneratedBytecode
    public static class AdviceFlowHolder {
        private boolean top;
        private AdviceFlowHolder(boolean top) {
            this.top = top;
        }
        @UsedByGeneratedBytecode
        public boolean isTop() {
            return top;
        }
        @UsedByGeneratedBytecode
        public void setTop(boolean top) {
            this.top = top;
        }
    }
}