001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.camel.util.concurrent;
018
019import java.util.function.Supplier;
020
021/**
022 * A {@link ThreadLocal} with an assigned name that makes introspection and debugging easier.
023 */
024public final class NamedThreadLocal<T> extends ThreadLocal<T> {
025
026    private final String name;
027    private final Supplier<T> supplier;
028
029    public NamedThreadLocal(String name) {
030        this(name, null);
031    }
032
033    public NamedThreadLocal(String name, Supplier<T> supplier) {
034        this.name = name;
035        this.supplier = supplier;
036    }
037
038    @Override
039    protected T initialValue() {
040        return supplier != null ? supplier.get() : null;
041    }
042
043    @Override
044    public String toString() {
045        return name;
046    }
047
048}