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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
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package org.apache.qpid.server.subscription;

import org.apache.qpid.AMQException;
import org.apache.qpid.framing.AMQShortString;
import org.apache.qpid.server.protocol.InternalTestProtocolSession;
import org.apache.qpid.server.util.InternalBrokerBaseCase;

import java.util.List;

public class QueueBrowserUsesNoAckTest extends InternalBrokerBaseCase
{

    public void testQueueBrowserUsesNoAck() throws AMQException
    {
        int sendMessageCount = 2;
        int prefetch = 1;

        //Check store is empty
        checkStoreContents(0);

        //Send required messsages to the queue
        publishMessages(getSession(), getChannel(), sendMessageCount);

        //Ensure they are stored
        checkStoreContents(sendMessageCount);

        //Check that there are no unacked messages
        assertEquals("Channel should have no unacked msgs ", 0,
                     getChannel().getUnacknowledgedMessageMap().size());

        //Set the prefetch on the session to be less than the sent messages
        getChannel().setCredit(0, prefetch);

        //browse the queue
        AMQShortString browser = browse(getChannel(), getQueue());

        getQueue().deliverAsync();

        //Wait for messages to fill the prefetch
        getSession().awaitDelivery(prefetch);

        //Get those messages
        List<InternalTestProtocolSession.DeliveryPair> messages =
                getSession().getDelivers(getChannel().getChannelId(), browser,
                                     prefetch);

        //Ensure we recevied the prefetched messages
        assertEquals(prefetch, messages.size());

        //Check the process didn't suspend the subscription as this would
        // indicate we are using the prefetch credit. i.e. using acks not No-Ack
        assertTrue("The subscription has been suspended",
                   !getChannel().getSubscription(browser).getState()
                           .equals(Subscription.State.SUSPENDED));       
    }

}