Examples of org.apache.activemq.filter.MessageEvaluationContext

org.apache.activemq.filter.MessageEvaluationContext
MessageEvaluationContext is used to cache selection results. A message usually has multiple selectors applied against it. Some selector have a high cost of evaluating against the message. Those selectors may whish to cache evaluation results associated with the message in the MessageEvaluationContext. @version $Revision: 1.4 $

                    consumers.add(subscription);
                    topicStore.addSubsciption(info, subscription.getConsumerInfo().isRetroactive());
                }
            }


            final MessageEvaluationContext msgContext = new NonCachedMessageEvaluationContext();
            msgContext.setDestination(destination);
            if (subscription.isRecoveryRequired()) {
                topicStore.recoverSubscription(clientId, subscriptionName, new MessageRecoveryListener() {
                    public boolean recoverMessage(Message message) throws Exception {
                        message.setRegionDestination(Topic.this);
                        try {
                            msgContext.setMessageReference(message);
                            if (subscription.matches(message, msgContext)) {
                                subscription.add(message);
                            }
                        } catch (IOException e) {
                            LOG.error("Failed to recover this message " + message);

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    protected void dispatch(final ConnectionContext context, Message message) throws Exception {
        // AMQ-2586: Better to leave this stat at zero than to give the user
        // misleading metrics.
        // destinationStatistics.getMessages().increment();
        destinationStatistics.getEnqueues().increment();
        MessageEvaluationContext msgContext = null;


        dispatchLock.readLock().lock();
        try {
            if (!subscriptionRecoveryPolicy.add(context, message)) {
                return;
            }
            synchronized (consumers) {
                if (consumers.isEmpty()) {
                    onMessageWithNoConsumers(context, message);
                    return;
                }
            }
            msgContext = context.getMessageEvaluationContext();
            msgContext.setDestination(destination);
            msgContext.setMessageReference(message);
            if (!dispatchPolicy.dispatch(message, msgContext, consumers)) {
                onMessageWithNoConsumers(context, message);
            }


        } finally {
            dispatchLock.readLock().unlock();
            if (msgContext != null) {
                msgContext.clear();
            }
        }
    }

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    private boolean suppressMessageDispatch(MessageDispatch md, DemandSubscription sub) throws Exception {
        boolean suppress = false;
        // for durable subs, suppression via filter leaves dangling acks so we need to
        // check here and allow the ack irrespective
        if (sub.getLocalInfo().isDurable()) {
            MessageEvaluationContext messageEvalContext = new MessageEvaluationContext();
            messageEvalContext.setMessageReference(md.getMessage());
            messageEvalContext.setDestination(md.getDestination());
            suppress = !sub.getNetworkBridgeFilter().matches(messageEvalContext);
        }
        return suppress;
    }

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                    LOG.debug("dispatch to browser: " + pendingBrowserDispatch.getBrowser()
                            + ", already dispatched/paged count: " + alreadyDispatchedMessages.size());
                }
                do {
                    try {
                        MessageEvaluationContext msgContext = new NonCachedMessageEvaluationContext();
                        msgContext.setDestination(destination);


                        QueueBrowserSubscription browser = pendingBrowserDispatch.getBrowser();
                        for (QueueMessageReference node : alreadyDispatchedMessages) {
                            if (!node.isAcked()) {
                                msgContext.setMessageReference(node);
                                if (browser.matches(node, msgContext)) {
                                    browser.add(node);
                                }
                            }
                        }

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        final BooleanExpression selectorExpression = SelectorParser.parse(selector);


        return new MessageReferenceFilter() {
            public boolean evaluate(ConnectionContext context, MessageReference r) throws JMSException {
                MessageEvaluationContext messageEvaluationContext = context.getMessageEvaluationContext();


                messageEvaluationContext.setMessageReference(r);
                if (messageEvaluationContext.getDestination() == null) {
                    messageEvaluationContext.setDestination(getActiveMQDestination());
                }


                return selectorExpression.matches(messageEvaluationContext);
            }
        };

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    public CompositeData[] browse(String selector) throws OpenDataException, InvalidSelectorException {
        Message[] messages = destination.browse();
        ArrayList<CompositeData> c = new ArrayList<CompositeData>();


        MessageEvaluationContext ctx = new MessageEvaluationContext();
        ctx.setDestination(destination.getActiveMQDestination());
        BooleanExpression selectorExpression = selector == null ? null : SelectorParser.parse(selector);


        for (int i = 0; i < messages.length; i++) {
            try {


                if (selectorExpression == null) {
                    c.add(OpenTypeSupport.convert(messages[i]));
                } else {
                    ctx.setMessageReference(messages[i]);
                    if (selectorExpression.matches(ctx)) {
                        c.add(OpenTypeSupport.convert(messages[i]));
                    }
                }

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     */
    public List<Object> browseMessages(String selector) throws InvalidSelectorException {
        Message[] messages = destination.browse();
        ArrayList<Object> answer = new ArrayList<Object>();


        MessageEvaluationContext ctx = new MessageEvaluationContext();
        ctx.setDestination(destination.getActiveMQDestination());
        BooleanExpression selectorExpression = selector == null ? null : SelectorParser.parse(selector);


        for (int i = 0; i < messages.length; i++) {
            try {
                Message message = messages[i];
                if (selectorExpression == null) {
                    answer.add(message);
                } else {
                    ctx.setMessageReference(message);
                    if (selectorExpression.matches(ctx)) {
                        answer.add(message);
                    }
                }

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        Message[] messages = destination.browse();
        CompositeType ct = factory.getCompositeType();
        TabularType tt = new TabularType("MessageList", "MessageList", ct, new String[] { "JMSMessageID" });
        TabularDataSupport rc = new TabularDataSupport(tt);


        MessageEvaluationContext ctx = new MessageEvaluationContext();
        ctx.setDestination(destination.getActiveMQDestination());
        BooleanExpression selectorExpression = selector == null ? null : SelectorParser.parse(selector);


        for (int i = 0; i < messages.length; i++) {
            try {
                if (selectorExpression == null) {
                    rc.put(new CompositeDataSupport(ct, factory.getFields(messages[i])));
                } else {
                    ctx.setMessageReference(messages[i]);
                    if (selectorExpression.matches(ctx)) {
                        rc.put(new CompositeDataSupport(ct, factory.getFields(messages[i])));
                    }
                }
            } catch (Throwable e) {

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        }
        
        // for durable subs, suppression via filter leaves dangling acks so we need to 
        // check here and allow the ack irrespective
        if (!suppress && sub.getLocalInfo().isDurable()) {
            MessageEvaluationContext messageEvalContext = new MessageEvaluationContext();
            messageEvalContext.setMessageReference(md.getMessage());
            suppress = !createNetworkBridgeFilter(null).matches(messageEvalContext);
        }  
        return suppress;
    }

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    public synchronized boolean recoverMessage(Message message, boolean cached) throws Exception {
        if (LOG.isTraceEnabled()) {
            LOG.trace("recover: " + message.getMessageId() + ", priority: " + message.getPriority());
        }
        boolean recovered = false;
        MessageEvaluationContext messageEvaluationContext = new NonCachedMessageEvaluationContext();
        messageEvaluationContext.setMessageReference(message);
        if (this.subscription.matches(message, messageEvaluationContext)) {
            recovered = super.recoverMessage(message, cached);
            if (recovered && !cached) {
                lastRecoveredPriority = message.getPriority();
            }

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Related Classes of org.apache.activemq.filter.MessageEvaluationContext

org.apache.activemq.broker.ConnectionContext

org.apache.activemq.broker.jmx.DestinationView

org.apache.activemq.broker.region.AbstractSubscription

org.apache.activemq.broker.region.cursors.TopicStorePrefetch

org.apache.activemq.broker.region.policy.FixedCountSubscriptionRecoveryPolicy

org.apache.activemq.broker.region.policy.FixedSizedSubscriptionRecoveryPolicy

org.apache.activemq.broker.region.policy.LastImageSubscriptionRecoveryPolicy

org.apache.activemq.broker.region.policy.QueryBasedSubscriptionRecoveryPolicy

org.apache.activemq.broker.region.policy.SimpleDispatchSelector

org.apache.activemq.broker.region.policy.TimedSubscriptionRecoveryPolicy

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