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 $

        slowConsumer = val;
    }


    public boolean addRecoveredMessage(ConnectionContext context, MessageReference message) throws Exception {
        boolean result = false;
        MessageEvaluationContext msgContext = context.getMessageEvaluationContext();
        try {
            msgContext.setDestination(message.getRegionDestination().getActiveMQDestination());
            msgContext.setMessageReference(message);
            result = matches(message, msgContext);
            if (result) {
                doAddRecoveredMessage(message);
            }


        } finally {
            msgContext.clear();
        }
        return result;
    }

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                            }
                            for (Iterator<Entry<Long, MessageKeys>> iterator = sd.orderIndex.iterator(tx, moc); iterator
                                    .hasNext();) {
                                Entry<Long, MessageKeys> entry = iterator.next();
                                if (selectorExpression != null) {
                                    MessageEvaluationContext ctx = new MessageEvaluationContext();
                                    ctx.setMessageReference(loadMessage(entry.getValue().location));
                                    if (selectorExpression.matches(ctx)) {
                                        counter++;
                                    }
                                } else {
                                    counter++;

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    private final MessageEvaluationContext messageEvaluationContext;
    private boolean dontSendReponse;
    private boolean clientMaster = true;


    public ConnectionContext() {
      this.messageEvaluationContext = new MessageEvaluationContext();
    }

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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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                    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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        // AMQ-2586: Better to leave this stat at zero than to give the user
        // misleading metrics.
        // destinationStatistics.getMessages().increment();
        destinationStatistics.getEnqueues().increment();
        dispatchValve.increment();
        MessageEvaluationContext msgContext = null;
        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 {
            dispatchValve.decrement();
            if (msgContext != null) {
                msgContext.clear();
            }
        }
    }

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            this.store = store;
        }


        public boolean recoverMessageReference(MessageId ref) throws Exception {
            if (selectorExpression != null) {
                MessageEvaluationContext ctx = new MessageEvaluationContext();
                ctx.setMessageReference(store.getMessage(ref));
                if (selectorExpression.matches(ctx)) {
                    count++;
                }
            } else {
                count ++;

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            return true;
        }


        public boolean recoverMessage(Message message) throws Exception {
            if (selectorExpression != null) {
                MessageEvaluationContext ctx = new MessageEvaluationContext();
                ctx.setMessageReference(store.getMessage(message.getMessageId()));
                if (selectorExpression.matches(ctx)) {
                    count++;
                }
            } else {
                count++;

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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(OpenTypeSupport.convert(message));
                } else {
                    ctx.setMessageReference(message);
                    if (selectorExpression.matches(ctx)) {
                        answer.add(message);
                    }
                }

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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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