3e1b181a67
* java/lang/AbstractMethodError.java: Re-merged with Classpath. * java/lang/ArithmeticException.java: Likewise. * java/lang/ArrayIndexOutOfBoundsException.java: Likewise. * java/lang/ArrayStoreException.java: Likewise. * java/lang/Byte.java: Likewise. * java/lang/CharSequence.java: Likewise. * java/lang/ClassCastException.java: Likewise. * java/lang/ClassCircularityError.java: Likewise. * java/lang/ClassFormatError.java: Likewise. * java/lang/CloneNotSupportedException.java: Likewise. * java/lang/Cloneable.java: Likewise. * java/lang/Comparable.java: Likewise. * java/lang/Compiler.java: Likewise. * java/lang/Error.java: Likewise. * java/lang/ExceptionInInitializerError.java: Likewise. * java/lang/IllegalAccessError.java: Likewise. * java/lang/IllegalAccessException.java: Likewise. * java/lang/IllegalArgumentException.java: Likewise. * java/lang/IllegalMonitorStateException.java: Likewise. * java/lang/IllegalStateException.java: Likewise. * java/lang/IllegalThreadStateException.java: Likewise. * java/lang/IncompatibleClassChangeError.java: Likewise. * java/lang/IndexOutOfBoundsException.java: Likewise. * java/lang/InheritableThreadLocal.java: Likewise. * java/lang/InstantiationError.java: Likewise. * java/lang/InstantiationException.java: Likewise. * java/lang/InternalError.java: Likewise. * java/lang/InterruptedException.java: Likewise. * java/lang/LinkageError.java: Likewise. * java/lang/NegativeArraySizeException.java: Likewise. * java/lang/NoClassDefFoundError.java: Likewise. * java/lang/NoSuchFieldError.java: Likewise. * java/lang/NoSuchFieldException.java: Likewise. * java/lang/NoSuchMethodError.java: Likewise. * java/lang/NoSuchMethodException.java: Likewise. * java/lang/NullPointerException.java: Likewise. * java/lang/NumberFormatException.java: Likewise. * java/lang/OutOfMemoryError.java: Likewise. * java/lang/Process.java: Likewise. * java/lang/Runnable.java: Likewise. * java/lang/RuntimePermission.java: Likewise. * java/lang/SecurityException.java: Likewise. * java/lang/Short.java: Likewise. * java/lang/StackOverflowError.java: Likewise. * java/lang/StringIndexOutOfBoundsException.java: Likewise. * java/lang/ThreadDeath.java: Likewise. * java/lang/ThreadLocal.java: Likewise. * java/lang/UnknownError.java: Likewise. * java/lang/UnsatisfiedLinkError.java: Likewise. * java/lang/UnsupportedClassVersionError.java: Likewise. * java/lang/UnsupportedOperationException.java: Likewise. * java/lang/VerifyError.java: Likewise. * java/lang/VirtualMachineError.java: Likewise. * java/lang/reflect/InvocationTargetException.java: Likewise. * java/net/BindException.java: Likewise. * java/net/ConnectException.java: Likewise. * java/net/MalformedURLException.java: Likewise. * java/net/NoRouteToHostException.java: Likewise. * java/net/ProtocolException.java: Likewise. * java/net/SocketException.java: Likewise. * java/net/UnknownHostException.java: Likewise. * java/net/UnknownServiceException.java: Likewise. From-SVN: r54656
140 lines
5.3 KiB
Java
140 lines
5.3 KiB
Java
/* InheritableThreadLocal -- a ThreadLocal which inherits values across threads
|
|
Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
package java.lang;
|
|
|
|
import java.util.Iterator;
|
|
import java.util.List;
|
|
import java.util.ArrayList;
|
|
import java.util.WeakHashMap;
|
|
|
|
/**
|
|
* A ThreadLocal whose value is inherited by child Threads. The value of the
|
|
* InheritableThreadLocal associated with the (parent) Thread is copied to
|
|
* the new (child) Thread at the moment of creation.
|
|
*
|
|
* <p>It is possible to make the value associated with the child Thread a
|
|
* function of the value that is associated with the parent Thread by
|
|
* overriding the <code>childValue()</code> method. The utility of this class
|
|
* is in transferring items like User ID or Transaction ID across threads
|
|
* automatically.
|
|
*
|
|
* @author Mark Wielaard <mark@klomp.org>
|
|
* @author Eric Blake <ebb9@email.byu.edu>
|
|
* @see ThreadLocal
|
|
* @since 1.2
|
|
* @status updated to 1.4
|
|
*/
|
|
public class InheritableThreadLocal extends ThreadLocal
|
|
{
|
|
/**
|
|
* Maps Threads to a List of InheritableThreadLocals (the heritage of that
|
|
* Thread). Uses a WeakHashMap so if the Thread is garbage collected the
|
|
* List can be collected, too. Maps to a list in case the user overrides
|
|
* equals.
|
|
*/
|
|
private static final WeakHashMap threadMap = new WeakHashMap();
|
|
|
|
/**
|
|
* Creates a new InheritableThreadLocal that has no values associated
|
|
* with it yet.
|
|
*/
|
|
public InheritableThreadLocal()
|
|
{
|
|
Thread currentThread = Thread.currentThread();
|
|
// Note that we don't have to synchronize, as only this thread will
|
|
// ever modify the returned heritage.
|
|
List heritage = (List) threadMap.get(currentThread);
|
|
if (heritage == null)
|
|
{
|
|
heritage = new ArrayList();
|
|
threadMap.put(currentThread, heritage);
|
|
}
|
|
heritage.add(this);
|
|
}
|
|
|
|
/**
|
|
* Determines the value associated with a newly created child Thread as a
|
|
* function of the value associated with the currently executing (parent)
|
|
* Thread. The default implementation just returns the parentValue.
|
|
*
|
|
* @param parentValue the value of this object in the parent thread at
|
|
* the moment of creation of the child
|
|
* @return the initial value for the child thread
|
|
*/
|
|
protected Object childValue(Object parentValue)
|
|
{
|
|
return parentValue;
|
|
}
|
|
|
|
/**
|
|
* Generates the childValues of all <code>InheritableThreadLocal</code>s
|
|
* that are in the heritage of the current Thread for the newly created
|
|
* childThread. Should be called from the contructor Thread.
|
|
*
|
|
* @param childThread the newly created thread, to inherit from this thread
|
|
* @see Thread#Thread(ThreadGroup, Runnable, String)
|
|
*/
|
|
static void newChildThread(Thread childThread)
|
|
{
|
|
// The currentThread is the parent of the new thread.
|
|
Thread parentThread = Thread.currentThread();
|
|
// Note that we don't have to synchronize, as only this thread will
|
|
// ever modify the returned heritage.
|
|
ArrayList heritage = (ArrayList) threadMap.get(parentThread);
|
|
if (heritage != null)
|
|
{
|
|
threadMap.put(childThread, heritage.clone());
|
|
// Perform the inheritance.
|
|
Iterator it = heritage.iterator();
|
|
int i = heritage.size();
|
|
while (--i >= 0)
|
|
{
|
|
InheritableThreadLocal local = (InheritableThreadLocal) it.next();
|
|
Object parentValue = local.valueMap.get(parentThread);
|
|
if (parentValue != null)
|
|
{
|
|
Object childValue = local.childValue(parentValue == NULL
|
|
? null : parentValue);
|
|
local.valueMap.put(childThread, (childValue == null
|
|
? NULL : parentValue));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|