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Re: Calls against multiple servers from a single client
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created by <a href="https://community.jboss.org/people/thammoud">Tarek Hammoud</a> in <i>JBoss AS 7 Development</i> - <a href="https://community.jboss.org/message/759427#759427">View the full discussion</a>
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<div class="jive-rendered-content"><p>Jaikiran,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I can not see how handing out the appropriate EJBClientContext solves this. I believe that EJBClientContext is the cause of this problem to the static usage in SELECTOR. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This is what we are currently doing using the JBOSS ejb client API to get around the multiple thread trashing SELECTOR in EJBClientContext.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>For each server target (Unique by credentials and host name/Port), we are creating a new ConfigBasedEJBClientContextSelector which in turn creates an EJBClientContext. When we invoke an ejb method, some invoker code in JBOSS will call requireCurrent on the EJBClientContext which will trash any SELECTOR currently set if being invoked from a separate thread. Our code is wrapping the proxy returned the InitialContext.lookup to globally lock before preceeding with an ejb call. This naturally will cause the server to become a client (Really, a very expensive server) to become single threaded. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: 'courier new', courier;">static class RemoteInvocationHandler implements InvocationHandler {</span></p><p><span style="font-family: 'courier new', courier;">        static  Object                            globalLock = new Object();</span></p><p><span style="font-family: 'courier new', courier;">        private ContextSelector<EJBClientContext> selector;</span></p><p><span style="font-family: 'courier new', courier;">        private Object                            delegate;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: 'courier new', courier;">        public RemoteInvocationHandler(ContextSelector<EJBClientContext> selector, Object delegate) {</span></p><p><span style="font-family: 'courier new', courier;">            this.selector = selector;</span></p><p><span style="font-family: 'courier new', courier;">            this.delegate = delegate;</span></p><p><span style="font-family: 'courier new', courier;">        }</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: 'courier new', courier;">        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {</span></p><p><strong style="font-family: 'courier new', courier;">            synchronized(globalLock) {  // EVIL Code</strong></p><p><span style="font-family: 'courier new', courier;">                EJBClientContext.setSelector(selector);</span></p><p><span style="font-family: 'courier new', courier;">                Object result = method.invoke(delegate, args);</span></p><p><span style="font-family: 'courier new', courier;">                return result;</span></p><p><span style="font-family: 'courier new', courier;">            }</span></p><p><span style="font-family: 'courier new', courier;">        }</span></p><p><span style="font-family: 'courier new', courier;">}</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: 'courier new', courier;">Thank you for your prompt reply.<br/></span></p></div>
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