[AMQ-5280] Incorrect handling of unknown values in selectors

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 5.8.0
• Assignee: Unassigned
• Reporter: Grigroy Sobko
• Created: 18/Jul/14 10:01
• Updated: 18/Jul/14 10:29
• Resolved: 18/Jul/14 10:06

Description

Due to JmsMessage specification :
http://docs.oracle.com/javaee/1.4/api/javax/jms/Message.html
There are rules how unknown Values evaluates.
There how AND operator should handle unknown:
UNKNOWN AND FALSE => FALSE
FALSE AND UNKNOWN => FALSE
And that's how it is handled in ActiveMQ:
UNKNOWN AND FALSE => UNKNOWN (!!!)
FALSE AND UNKNOWN => FALSE

I've wrote test to reproduce this:

package org.activemq.test;

import org.apache.activemq.command.ActiveMQMessage;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.filter.BooleanExpression;
import org.apache.activemq.filter.MessageEvaluationContext;
import org.apache.activemq.selector.SelectorParser;
import org.junit.Before;
import org.junit.Test;

import javax.jms.JMSException;
import javax.jms.Message;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

public class SelectorUnknownHandlingTest {

    private Message message;

    @Before
    public void setUp() throws Exception {
        message = createMessage();
    }

    @Test
    public void testUnknown() throws Exception {
        // Some unset property with gt operator => unknown
        assertSelectorEvaluatesToUnknown(message, "(unknownProp > 0)");

    }

    @Test
    public void testUnknownAndFalse() throws Exception {
        // false and unknown => false
        assertSelectorEvaluatesToFalse(message, "(falseProp AND unknownProp > 0)");

        // THIS ASSERTION FAILS !! IT EVALUATES TO UNKNOWN INSTEAD
        // unknown and false => false
        assertSelectorEvaluatesToFalse(message, "(unknownProp > 0 AND falseProp)");

    }

    @Test
    public void testUnknownOrTrue() throws Exception {

        // unknown or true => true
        assertSelectorEvaluatesToTrue(message, "(unknownProp > 0 OR trueProp)");

        // true or unknown => true
        assertSelectorEvaluatesToTrue(message, "(trueProp OR unknownProp > 0)");

    }

    private void assertSelectorEvaluatesToUnknown(Message message, String selector) throws JMSException {
        assertSelector(message, selector, false);
        assertSelector(message, "not(" + selector + ")", false);
    }

    private void assertSelectorEvaluatesToFalse(Message message, String selector) throws JMSException {
        assertSelector(message, selector, false);
        assertSelector(message, "not(" + selector + ")", true);
    }

    private void assertSelectorEvaluatesToTrue(Message message, String selector) throws JMSException {
        assertSelector(message, selector, true);
        assertSelector(message, "not(" + selector + ")", false);
    }


    protected Message createMessage() throws JMSException {
        Message message = createMessage("FOO.BAR");
        message.setJMSType("selector-test");
        message.setJMSMessageID("connection:1:1:1:1");
        message.setBooleanProperty("trueProp", true);
        message.setBooleanProperty("falseProp", false);
        return message;
    }

    protected void assertSelector(Message message, String text, boolean expected) throws JMSException {
        BooleanExpression selector = SelectorParser.parse(text);
        assertTrue("Created a valid selector", selector != null);
        MessageEvaluationContext context = new MessageEvaluationContext();
        context.setMessageReference((org.apache.activemq.command.Message)message);
        boolean value = selector.matches(context);
        assertEquals("Selector for: " + text, expected, value);
    }

    protected Message createMessage(String subject) throws JMSException {
        ActiveMQMessage message = new ActiveMQMessage();
        message.setJMSDestination(new ActiveMQTopic(subject));
        return message;
    }
}

Issue Links

• is duplicated by: AMQ-5281 Incorrect handling of unknown values in selectors