/*
* JBoss, Home of Professional Open Source
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* (C) 2005-2006,
* @author JBoss Inc.
*/
/*
* Copyright (C) 1998, 1999, 2000, 2001,
*
* Arjuna Solutions Limited,
* Newcastle upon Tyne,
* Tyne and Wear,
* UK.
*
* $Id: ThreadActionData.java 2342 2006-03-30 13:06:17Z $
*/
package org.jboss.narayana.blacktie.jatmibroker.core.tx;
import java.util.EmptyStackException;
import java.util.NoSuchElementException;
import java.util.Stack;
import org.jboss.narayana.blacktie.jatmibroker.jab.JABTransaction;
/**
* This class maintains a mapping between a thread and its notion of the current
* transaction. Essentially this is a stack of transactions.
*
* @author Mark Little (mark@arjuna.com)
* @version $Id: ThreadActionData.java 2342 2006-03-30 13:06:17Z $
* @since JTS 1.0.
*/
public class ThreadActionData {
public static JABTransaction currentAction() {
// XXX NOT USED ThreadActionData.setup();
Stack txs = (Stack) _threadList.get();
if (txs != null) {
try {
return (JABTransaction) txs.peek();
} catch (EmptyStackException e) {
}
}
return null;
}
public static void pushAction(JABTransaction a) {
pushAction(a, true);
}
/**
* By setting the register flag accordingly, information about the thread
* may not be propagated to the action, i.e., only the thread's notion of
* current changes.
*/
public static void pushAction(JABTransaction a, boolean register) {
Thread t = Thread.currentThread();
Stack txs = (Stack) _threadList.get();
if (txs == null) {
txs = new Stack();
txs.push(a);
_threadList.set(txs);
} else
txs.push(a);
if (register)
a.addChildThread(t);
}
/**
* Put back the entire hierarchy, removing whatever is already there.
*/
public static void restoreActions(JABTransaction act) {
purgeActions();
if (act != null) {
/*
* First get the hierarchy from the bottom up.
*/
java.util.Stack s = new java.util.Stack();
JABTransaction nextLevel = act.parent();
s.push(act);
while (nextLevel != null) {
s.push(nextLevel);
nextLevel = nextLevel.parent();
}
/*
* Now push the hierarchy onto the thread stack.
*/
try {
while (!s.empty()) {
pushAction((JABTransaction) s.pop());
}
} catch (Exception ex) {
}
}
}
public static JABTransaction popAction() throws EmptyStackException {
return popAction(ThreadUtil.getThreadId(), true);
}
public static JABTransaction popAction(boolean unregister)
throws EmptyStackException {
return popAction(ThreadUtil.getThreadId(), unregister);
}
public static JABTransaction popAction(String threadId)
throws EmptyStackException {
return popAction(threadId, true);
}
/**
* By setting the unregister flag accordingly, information about the thread
* is not removed from the action.
*/
public static JABTransaction popAction(String threadId, boolean unregister)
throws EmptyStackException {
Stack txs = (Stack) _threadList.get();
if (txs != null) {
JABTransaction a = (JABTransaction) txs.pop();
if ((a != null) && (unregister)) {
a.removeChildThread(threadId);
}
if (txs.size() == 0) {
_threadList.set(null);
}
return a;
}
return null;
}
public static void purgeAction(JABTransaction act)
throws NoSuchElementException {
ThreadActionData.purgeAction(act, Thread.currentThread(), true);
}
public static void purgeAction(JABTransaction act, Thread t)
throws NoSuchElementException {
ThreadActionData.purgeAction(act, t, true);
}
public static void purgeAction(JABTransaction act, Thread t,
boolean unregister) throws NoSuchElementException {
if ((act != null) && (unregister)) {
act.removeChildThread(ThreadUtil.getThreadId(t));
}
Stack txs = (Stack) _threadList.get();
if (txs != null) {
txs.removeElement(act);
if (txs.size() == 0) {
_threadList.set(null);
}
}
}
public static void purgeActions() {
purgeActions(Thread.currentThread(), true);
}
public static void purgeActions(Thread t) {
purgeActions(t, true);
}
public static void purgeActions(Thread t, boolean unregister) {
Stack txs = (Stack) _threadList.get();
_threadList.set(null);
if (txs != null) {
if (unregister) {
while (!txs.empty()) {
JABTransaction act = (JABTransaction) txs.pop();
if (act != null) {
act.removeChildThread(ThreadUtil.getThreadId(t));
}
}
}
}
}
/**
* Add a per thread setup object to the global list. This should only happen
* before the transaction service really begins, or you risk having some
* threads see one view of the list that is different to other threads.
*
* @param s
* the setup to add.
*/
/*
* XXX NOT USED public static void addSetup (ThreadSetup s) { synchronized
* (_threadSetups) { _threadSetups.add(s); } }
*/
/**
* Remove a per thread setup object to the global list. This should only
* happen after the transaction service really ends, or you risk having some
* threads see one view of the list that is different to other threads.
*
* @param s
* the setup to add.
*/
/*
* XXX NOT USED public static boolean removeSetup (ThreadSetup s) {
* synchronized (_threadSetups) { return _threadSetups.remove(s); } }
*
* private static void setup () { for (int i = 0; i < _threadSetups.size();
* i++) { ThreadSetup s = (ThreadSetup) _threadSetups.get(i);
*
* if (s != null) s.setup(); } }
*
* private static ArrayList _threadSetups = new ArrayList();
*/
private static ThreadLocal _threadList = new ThreadLocal();
}