01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17:
18: package java.lang;
19:
20: /**
21: * An InheritableThreadLocal is very similar to a ThreadLocal, with the added
22: * functionality that a child Thread inherits all InheritableThreadLocal from
23: * its parent Thread upon Thread creation time.
24: *
25: * @see java.lang.Thread
26: * @see java.lang.ThreadLocal
27: */
28:
29: public class InheritableThreadLocal<T> extends ThreadLocal<T> {
30: /**
31: * Constructs a new InheritableThreadLocal object
32: */
33: public InheritableThreadLocal() {
34: super ();
35: }
36:
37: /**
38: * Computes the created Thread's initial value for this
39: * InheritableThreadLocal based on the current value of the same local on
40: * the creator Thread.
41: */
42: protected T childValue(T parentValue) {
43: return parentValue;
44: }
45: }
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