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https://issues.apache.org/jira/browse/PORTLETBRIDGE-58?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Freedman updated PORTLETBRIDGE-58:
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Status: Patch Available (was: Open)
> Race condition BridgeImpl in multi-threaded environment
> -------------------------------------------------------
>
> Key: PORTLETBRIDGE-58
> URL: https://issues.apache.org/jira/browse/PORTLETBRIDGE-58
> Project: MyFaces Portlet Bridge
> Issue Type: Bug
> Components: Impl
> Affects Versions: 1.0.0-alpha-3, 1.0.0-beta
> Environment: Pluto 1.1.5
> JSF 1.2 / RI
> Reporter: Stephan Voigt
> Priority: Critical
>
> The implementation in BridgeImpl delegates the calls to the JSF Phases to a
> initially created LifeCycle instance (member of BrideImpl).
> In order to implement the LifeCycle acc. JSR-301 all JSF-Phases except
> RENDER_RESPONSE are suppressed using a PhaseListener which calls
> renderResponse on the current FacesContext, so that the further phase
> processing stops.
> The PhaseListener is registered and unregistered in doFacesRender() during a
> render request.
> The problem: when executed in multiple threads, calls to doFacesRequest
> (ActionRequests) use the same LifeCycle instance, which causes a race
> condition. The processing of the portlet action will canceled for that
> request.
> We reproduced that behavior in our environment (JSF-RI, Pluto 1.1.5,
> PortletBridge 1.0.0-alpha-3, beta1) using loadtests with 3 or more parallel
> threads.
> The problematic code-passage in BridgeImpl (see addPhaseListener and
> removePhaseListener calls):
> ...
> private void doFacesRender(RenderRequest request, RenderResponse response,
> FacesContext context, Lifecycle lifecycle, String scopeId,
> List <String> preExistingAttributes)
> throws BridgeException, BridgeUninitializedException, NullPointerException
> {
> ...
> if (context.getViewRoot() == null)
> {
> // add self as PhaseListener to prevent action phases from
> // executing
> lifecycle.addPhaseListener(this);
> try
> {
> lifecycle.execute(context);
> }
> catch (Exception e)
> {
> ....
> }
> finally
> {
> lifecycle.removePhaseListener(this);
> }
> ....
> In order to solve the problem, we patched the BridgeImpl class in that way it
> uses a static configuration for the LifeCycle instance with one enabled
> Phase-Listener. The decision when the request processing should be stopped
> (via calling renderResponse() on the FacesContext) is handled using a
> ThreadLocal flag indicating the mode (Action/Render) of the current
> BridgeRequest.
> Please let me know, if I should provide a corresponding patch set (based on
> the beta-1 code line) or if the problem will be solved in a different manner.
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