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}