diff options
Diffstat (limited to 'jsf/plugins/org.eclipse.jst.jsf.core/src/org/eclipse/jst/jsf/designtime/context/ViewRootHolder.java')
| -rw-r--r-- | jsf/plugins/org.eclipse.jst.jsf.core/src/org/eclipse/jst/jsf/designtime/context/ViewRootHolder.java | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/jsf/plugins/org.eclipse.jst.jsf.core/src/org/eclipse/jst/jsf/designtime/context/ViewRootHolder.java b/jsf/plugins/org.eclipse.jst.jsf.core/src/org/eclipse/jst/jsf/designtime/context/ViewRootHolder.java deleted file mode 100644 index d33349622..000000000 --- a/jsf/plugins/org.eclipse.jst.jsf.core/src/org/eclipse/jst/jsf/designtime/context/ViewRootHolder.java +++ /dev/null @@ -1,192 +0,0 @@ -/******************************************************************************* - * Copyright (c) 2001, 2008 Oracle Corporation and others. - * All rights reserved. This program and the accompanying materials - * are made available under the terms of the Eclipse Public License v1.0 - * which accompanies this distribution, and is available at - * http://www.eclipse.org/legal/epl-v10.html - * - * Contributors: - * Oracle Corporation - initial API and implementation - *******************************************************************************/ -/** - * - */ -package org.eclipse.jst.jsf.designtime.context; - -import java.util.ArrayList; -import java.util.List; - -import org.eclipse.core.resources.IResource; -import org.eclipse.jst.jsf.core.internal.JSFCorePlugin; -import org.eclipse.jst.jsf.designtime.internal.view.DTUIViewRoot; -import org.eclipse.jst.jsf.designtime.internal.view.IDTViewHandler; -import org.eclipse.jst.jsf.designtime.internal.view.IViewRootHandle; -import org.eclipse.jst.jsf.designtime.internal.view.DTUIViewRoot.StalenessListener; -import org.eclipse.jst.jsf.designtime.internal.view.IDTViewHandler.ViewHandlerException; - -/* package */ final class ViewRootHolder implements IViewRootHandle, Cloneable -{ - private final Object _recalcViewRootExclusion; - private final DTFacesContext _facesContext; - private DTUIViewRoot _viewRoot; - private final List<StalenessListener> _waitingToAdd; - private final List<StalenessListener> _waitingToRemove; - - public ViewRootHolder(final DTFacesContext facesContext, final Object recalcViewRootExclusion) - { - _facesContext = facesContext; - _recalcViewRootExclusion = recalcViewRootExclusion; - _waitingToAdd = new ArrayList<StalenessListener>(); - _waitingToRemove = new ArrayList<StalenessListener>(); - } - - private ViewRootHolder(ViewRootHolder cloneFrom) - { - _recalcViewRootExclusion = cloneFrom._recalcViewRootExclusion; - _facesContext = cloneFrom._facesContext; - _viewRoot = cloneFrom.getCachedViewRoot(); - - // create brand new copies - _waitingToAdd = new ArrayList<StalenessListener>(); - _waitingToRemove = new ArrayList<StalenessListener>(); - } - - public synchronized DTUIViewRoot getCachedViewRoot() - { - return _viewRoot; - } - - public DTUIViewRoot updateViewRoot() - { - DTUIViewRoot viewRoot = null; - final IResource contextResource = _facesContext.adaptContextObject(); - - // we create this additional exclusion so that we avoid a - // situation - // where two threads enter and start recalculating the same view - // root in parallel. Only one thread may be working on creating - // a new view root for a particular view at any given time. Note - // that due to read/write lock on the value, there is nothing - // to stop readers from simultaneous getting the old value until - // the new value is ready and has been set. - synchronized (_recalcViewRootExclusion) - { - viewRoot = getCachedViewRoot(); - - if (viewRoot == null || viewRoot.isStale()) - { - // if the view root hasn't been created, then do so - // and populate it - final IDTViewHandler viewHandler = _facesContext - .getViewHandler(contextResource); - - if (viewHandler != null) - { - final String viewId = viewHandler.getViewId( - _facesContext, contextResource); - - try - { - viewRoot = viewHandler.createView(_facesContext, - viewId); - if (viewRoot != null) - { - setCachedViewRoot(viewRoot); - } - - // do adds first, let remove trump all - for (final StalenessListener addListener : _waitingToAdd) - { - viewRoot.addListener(addListener); - } - - for (final StalenessListener removeListener : _waitingToRemove) - { - viewRoot.removeListener(removeListener); - } - } - catch (final ViewHandlerException e) - { - JSFCorePlugin.log(e, - "While creating dt viewroot for viewId: " //$NON-NLS-1$ - + viewId); - } - } - } - } - // return the copy. NEVER return _viewRoot directly since we are not - // synchronized here. - return viewRoot; - } - - private synchronized void setCachedViewRoot( - final DTUIViewRoot newViewRoot) - { - if (!Thread.holdsLock(_recalcViewRootExclusion)) - { - throw new IllegalStateException( - "Must hold _recalcViewRootExclusion to modify view root"); //$NON-NLS-1$ - } - _viewRoot = newViewRoot; - } - - @Override - protected synchronized IViewRootHandle clone() - { - return new ViewRootHolder(this); - } - - public void addListener(StalenessListener listener) - { - if (_viewRoot != null) - { - synchronized(this) - { - _viewRoot.addListener(listener); - } - } - else - { - // ensure that if we calculating a new view root, then there isn't - // an issue. - synchronized(_recalcViewRootExclusion) - { - synchronized(this) - { - _waitingToAdd.add(listener); - } - } - } - } - - public void removeListener(StalenessListener listener) - { - DTUIViewRoot viewRoot = null; - - synchronized(this) - { - viewRoot = _viewRoot; - } - - if (viewRoot != null) - { - synchronized(this) - { - viewRoot.removeListener(listener); - } - } - else - { - // ensure that if we calculating a new view root, then there isn't - // an issue. - // always acquire the recalcViewRootExclusion first - synchronized(_recalcViewRootExclusion) - { - synchronized(this) - { - _waitingToAdd.add(listener); - } - } - } - } -}
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