Examples of org.apache.qpid.qmf2.common.QmfQuery

org.apache.qpid.qmf2.common.QmfQuery
.apache.org/qpid/qmfv2-api-proposal.html>QMF2 API Proposal and the QMF2 protocol that is specified at QMF Map Message Protocol in particular the use of the underscore to specify key names e.g. "_what", "_where", "_object_id", "_schema_id".
This implementation trusts the protocol specification more than the API specification as the underscores are more consistent with the rest of the protocol and the underscored variants are what have been observed when querying the broker ManagementAgent.
A QmfQuery may be constructed as either an "ID" query (to query for a specific ObjectId or SchemaClassId) or a "PREDICATE" query (to query based upon an expression). Note that QMF considers string arguments in boolean expressions to be names of data values in the target object. When evaluating a predicate expression, QMF will fetch the value of the named data item from each candidate target object. The value is then used in the boolean expression. In other words, QMF considers string arguments to be variables in the expression. In order to indicate that a string should be treated as a literal instead, the string must be quoted using the "quote" expression.
Examples
Assume a QmfData type defines fields named "name", "address" and "town". The following predicate expression matches any instance with a name field set to "tross", or any instance where the name field is "jross", the address field is "1313 Spudboy Lane" and the town field is "Utopia":
```
 ["or" ["eq" "name" ["quote" "tross"]] ["and" ["eq" "name" ["quote" "jross"]] ["eq" "address" ["quote" "1313 Spudboy Lane"]] ["eq" ["quote" "Utopia"] "town"] ] ] 
```
Assume a QmfData type with fields "name" and "age". A predicate to find all instances with name matching the regular expression "?ross" with an optional age field that is greater than the value 29 or less than 12 would be:
```
 ["and" ["re_match" "name" ["quote" "?ross"]] ["and" ["exists" "age"] ["or" ["gt" "age" 27] ["lt" "age" 12]] ] ] 
```
The Expression structure is illustrated below in the context of its relationship with QmfQuery. @author Fraser Adams

     */
    private void createQueueSubscription()
    {
        try
        {   // This QmfQuery simply does an ID query for objects with the className "queue"
            QmfQuery query = new QmfQuery(QmfQueryTarget.OBJECT, new SchemaClassId("queue"));
            SubscribeParams params = _console.createSubscription(_broker, query, "queueStatsHandle");
            _subscriptionId = params.getSubscriptionId();
            _subscriptionDuration = params.getLifetime() - 10; // Subtract 10 as we want to refresh before it times out
            _startTime = System.currentTimeMillis();
        }

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            addObject(ostrich);




            System.out.println("total number of objects registered: " + _objectIndex.size());


            QmfQuery query;
            List<QmfConsoleData> results;


            System.out.println("looking up wasp object by ID");
            query = new QmfQuery(QmfQueryTarget.OBJECT, wasp.getObjectId());
            results = evaluateDataQuery(query);
            displayResults(results);


            System.out.println("\nlooking up mammal objects");
            query = new QmfQuery(QmfQueryTarget.OBJECT, new SchemaClassId("mammal"));
            results = evaluateDataQuery(query);
            displayResults(results);


            System.out.println("\nlooking up everything in package com.fadams.qmf2");
            query = new QmfQuery(QmfQueryTarget.OBJECT, new SchemaClassId("com.fadams.qmf2", null));
            results = evaluateDataQuery(query);
            displayResults(results);




            System.out.println("\nQuery for all mammals with more than two legs");
            String predicate = "['and', ['eq', '_package_name', ['quote', 'com.fadams.qmf2']], " +
                                       "['eq', '_class_name', ['quote', 'mammal']], " +
                                       "['gt', 'legs', 2]]";


            //predicate = "['eq', '_package_name', ['quote', 'com.fadams.qmf2']]";


            //predicate = "[]";


            query = new QmfQuery(QmfQueryTarget.OBJECT, predicate);
            System.out.println(query.getPredicate());


            results = evaluateDataQuery(query);
            displayResults(results);




            System.out.println("\nQuery for everything with less than four legs");
            predicate = "['lt', 'legs', 4]";


            query = new QmfQuery(QmfQueryTarget.OBJECT, predicate);
            System.out.println(query.getPredicate());


            results = evaluateDataQuery(query);
            displayResults(results);




            System.out.println("\nQuery for everything with between two and four legs");
            predicate = "['and', ['ge', 'legs', 2], " +
                                "['le', 'legs', 4]]";


            query = new QmfQuery(QmfQueryTarget.OBJECT, predicate);
            System.out.println(query.getPredicate());


            results = evaluateDataQuery(query);
            displayResults(results);




            System.out.println("\nQuery for all reptiles or birds");
            predicate = "['or', ['eq', '_class_name', ['quote', 'reptile']], " +
                               "['eq', '_class_name', ['quote', 'bird']]]";


            query = new QmfQuery(QmfQueryTarget.OBJECT, predicate);
            System.out.println(query.getPredicate());


            results = evaluateDataQuery(query);
            displayResults(results);




            System.out.println("\nQuery for everything whose name matches the regex ^h");
            predicate = "['re_match', 'name', ['quote', '^h']]";


            query = new QmfQuery(QmfQueryTarget.OBJECT, predicate);
            System.out.println(query.getPredicate());


            results = evaluateDataQuery(query);
            displayResults(results);

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            {
                if (AMQPMessage.isAMQPMap(message))
                {
                    try
                    {
                        QmfQuery query = new QmfQuery(AMQPMessage.getMap(message));
                        handleQueryRequest(handle, query);
                    }
                    catch (QmfException qmfe)
                    {
                        raiseException(handle, "Query Request failed, invalid Query: " + qmfe.getMessage());

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        _objectIndex.put(addr, object);


        // Does the new object match any Subscriptions? If so add a reference to the matching Subscription and publish.
        for (Subscription subscription : _subscriptions.values())
        {
            QmfQuery query = subscription.getQuery();
            if (query.getObjectId() != null)
            {
                if (query.getObjectId().equals(addr))
                {
                    object.addSubscription(subscription.getSubscriptionId(), subscription);
                    object.publish();
                }
            }
            else if (query.evaluate(object))
            {
                object.addSubscription(subscription.getSubscriptionId(), subscription);
                object.publish();
            }
        }

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        }


        if (wi.getType() == QUERY)
        {
            QueryWorkItem item = (QueryWorkItem)wi;
            QmfQuery query = item.getQmfQuery();


            System.out.println("Query User ID = " + item.getUserId());


            if (query.getObjectId() != null)
            {
                // Look up a QmfAgentData object by the ObjectId obtained from the query
                ObjectId objectId = query.getObjectId();
                QmfAgentData object = _objectIndex.get(objectId);
                if (object != null && !object.isDeleted())
                {
                    _agent.queryResponse(item.getHandle(), object);
                }
                _agent.queryComplete(item.getHandle(), 0);
            }
            else
            {
                // Look up QmfAgentData objects by the SchemaClassId obtained from the query
                // This is implemented by a linear search and allows searches with only the className specified.
                // Linear searches clearly don't scale brilliantly, but the number of QmfAgentData objects managed
                // by an Agent is generally fairly small, so it should be OK. Note that this is the same approach
                // taken by the C++ broker ManagementAgent, so if it's a problem here........
                for (QmfAgentData object : _objectIndex.values())
                {
                    if (!object.isDeleted() && query.evaluate(object))
                    {
                        _agent.queryResponse(item.getHandle(), object);
                    }
                }
                _agent.queryComplete(item.getHandle(), 0);

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        _objectIndex.put(addr, object);


        // Does the new object match any Subscriptions? If so add a reference to the matching Subscription and publish.
        for (Subscription subscription : _subscriptions.values())
        {
            QmfQuery query = subscription.getQuery();
            if (query.getObjectId() != null)
            {
                if (query.getObjectId().equals(addr))
                {
                    object.addSubscription(subscription.getSubscriptionId(), subscription);
                    object.publish();
                }
            }
            else if (query.evaluate(object))
            {
                object.addSubscription(subscription.getSubscriptionId(), subscription);
                object.publish();
            }
        }

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                    }
                    else if (_subscriptionEmulationEnabled && agentName.equals(_brokerAgentName))
                    { // If the data has come from is the broker Agent we emulate a Subscription on the Console
                        for (SubscriptionManager subscription : _subscriptionByHandle.values())
                        {
                            QmfQuery query = subscription.getQuery();
                            if (subscription.getAgent().getName().equals(_brokerAgentName) &&
                                query.getTarget() == QmfQueryTarget.OBJECT)
                            { // Only evaluate broker Agent subscriptions with QueryTarget == OBJECT on the Console.
                                long objectEpoch = 0;
                                consoleHandle = subscription.getConsoleHandle();
                                List<Map> list = AMQPMessage.getList(message);
                                List<QmfConsoleData> resultList = new ArrayList<QmfConsoleData>(list.size());
                                for (Map m : list)
                                { // Evaluate the QmfConsoleData object against the query
                                    QmfConsoleData object = new QmfConsoleData(m, agent);
                                    if (query.evaluate(object))
                                    {
                                        long epoch = object.getObjectId().getAgentEpoch();
                                        objectEpoch = (epoch > objectEpoch && !object.isDeleted()) ? epoch : objectEpoch;
                                        resultList.add(object);
                                    }

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            }


            System.out.println("Creating Query for objects whose name property has a value that starts with 'a'");


            SubscribeParams params;
            QmfQuery query = new QmfQuery(QmfQueryTarget.OBJECT, "['re_match', 'name', ['quote', '^a']]");


            // Create a subscription, response returned synchronously
            params = _console.createSubscription(_broker, query, "consoleHandle1", "{publishInterval:5}");
            System.out.println("duration = " + params.getLifetime());
            System.out.println("interval = " + params.getPublishInterval());
            System.out.println("subscriptionId = " + params.getSubscriptionId());
            System.out.println("consoleHandle = " + params.getConsoleHandle());


            // Sleep a while, getting query result as they become available
            try
            {
                Thread.sleep(20000);
            }
            catch (InterruptedException ie)
            {
            }


            // Refresh the subscription getting results asynchronously, just for variety
            System.out.println("Calling refreshSubscription on " + params.getSubscriptionId());
            _console.refreshSubscription(params.getSubscriptionId(), "{replyHandle:ignoredReplyHandle}");




            // Create a subscription for _class_name = queue
            System.out.println("Creating Query for all queue objects");
            query = new QmfQuery(QmfQueryTarget.OBJECT, "['eq', '_class_name', ['quote', 'queue']]");
            params = _console.createSubscription(_broker, query, "queues");


            while (_objectId == null)
            {
                System.out.println("Waiting for ObjectId to be set");
                try
                {
                    Thread.sleep(1000);
                }
                catch (InterruptedException ie)
                {
                }
            }


            // Cancel the query for all queue objects
            System.out.println("Cancelling Query for all queue objects");
            _console.cancelSubscription(params.getSubscriptionId());


            // Create a subscription for _object_id
            System.out.println("Creating Query for _object_id = " + _objectId);
            query = new QmfQuery(QmfQueryTarget.OBJECT, _objectId);
            params = _console.createSubscription(_broker, query, "queues");


        }
        catch (QmfException qmfe)
        {

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            }


            System.out.println("Creating Query for objects whose state property has a value that starts with 'OP'");


            SubscribeParams params;
            QmfQuery query = new QmfQuery(QmfQueryTarget.OBJECT, "['re_match', 'state', ['quote', '^OP']]");


            // Create a subscription, response returned synchronously
            params = _console.createSubscription(_gizmo, query, "consoleHandle1", "{publishInterval:5}");
            System.out.println("duration = " + params.getLifetime());
            System.out.println("interval = " + params.getPublishInterval());

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     */
    private void createQueueSubscription()
    {
        try
        {   // This QmfQuery simply does an ID query for objects with the className "queue"
            QmfQuery query = new QmfQuery(QmfQueryTarget.OBJECT, new SchemaClassId("queue"));
            SubscribeParams params = _console.createSubscription(_broker, query, "queueStatsHandle");
            _subscriptionId = params.getSubscriptionId();
            _subscriptionDuration = params.getLifetime() - 10; // Subtract 10 as we want to refresh before it times out
            _startTime = System.currentTimeMillis();
        }

View Full Code Here

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