/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file 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, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.activemq.broker.jmx;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.EmbeddedBrokerTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.management.MBeanServer;
import javax.management.MBeanServerInvocationHandler;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import java.util.ArrayList;
import java.util.List;

/**
 * Purging with large message that hit the memory limit boundaries of a queue.
 */
public class PurgeLargeMessageTest extends EmbeddedBrokerTestSupport {
    private static final Logger LOG = LoggerFactory.getLogger(PurgeLargeMessageTest.class);

    protected MBeanServer mbeanServer;
    protected String domain = "org.apache.activemq";
    protected String clientID = "foo";

    protected Connection connection;
    protected boolean transacted;
    protected int authMode = Session.AUTO_ACKNOWLEDGE;


    public void testPurgeLargeMessage() throws Exception {

        final int messageCount = 600;

        // Send some messages
        connection = connectionFactory.createConnection();
        connection.setClientID(clientID);
        connection.start();
        Session session = connection.createSession(transacted, authMode);
        destination = createDestination();
        MessageProducer producer = session.createProducer(destination);
        Message message = createTextMessage(session, 5000);
        for (int i = 0; i < messageCount; i++) {
            producer.send(message);
        }

        // Now get the QueueViewMBean and purge
        String objectNameStr = broker.getBrokerObjectName().toString();
        objectNameStr += ",destinationType=Queue,destinationName="+getDestinationString();
        ObjectName queueViewMBeanName = assertRegisteredObjectName(objectNameStr);
        QueueViewMBean proxy = (QueueViewMBean)MBeanServerInvocationHandler.newProxyInstance(mbeanServer, queueViewMBeanName, QueueViewMBean.class, true);

        long count = proxy.getQueueSize();
        assertEquals("Queue size", count, messageCount);

        //force a page in to exceed the memory limit.
        proxy.browse();

        // try a purge, with message still to load from the store.
        proxy.purge();

        count = proxy.getQueueSize();
        assertEquals("Queue size", count, 0);
        assertEquals("Browse size", proxy.browseMessages().size(), 0);

        producer.close();
    }

    private TextMessage createTextMessage(Session session, long textSize) throws JMSException {

        StringBuilder stringBuilder = new StringBuilder();
        for(long i = 0; i<textSize;i++){
            stringBuilder.append('A');
        }
        return session.createTextMessage(stringBuilder.toString());
    }


    protected ObjectName assertRegisteredObjectName(String name) throws MalformedObjectNameException, NullPointerException {
        ObjectName objectName = new ObjectName(name);
        if (mbeanServer.isRegistered(objectName)) {
            echo("Bean Registered: " + objectName);
        } else {
            fail("Could not find MBean!: " + objectName);
        }
        return objectName;
    }

    protected void setUp() throws Exception {
        bindAddress = "tcp://localhost:0";
        useTopic = false;
        super.setUp();
        mbeanServer = broker.getManagementContext().getMBeanServer();
    }

    protected void tearDown() throws Exception {
        if (connection != null) {
            connection.close();
            connection = null;
        }
        super.tearDown();
    }

    protected BrokerService createBroker() throws Exception {
        BrokerService answer = new BrokerService();
        answer.setUseJmx(true);
        answer.setEnableStatistics(true);
        answer.addConnector(bindAddress);
        answer.deleteAllMessages();

        PolicyMap policyMap = new PolicyMap();
        List<PolicyEntry> entries = new ArrayList<PolicyEntry>();
        PolicyEntry pe = new PolicyEntry();

        //make the paging a little more deterministic
        // by turning off the cache and periodic expiry
        pe.setQueue(">");
        pe.setUseCache(false);
        pe.setMemoryLimit(1000000);
        pe.setExpireMessagesPeriod(0);


        entries.add(pe);

        policyMap.setPolicyEntries(entries);
        answer.setDestinationPolicy(policyMap);

        return answer;
    }

    @Override
    protected ConnectionFactory createConnectionFactory() throws Exception {
        return new ActiveMQConnectionFactory(broker.getTransportConnectors().get(0).getPublishableConnectString());
    }

    protected void echo(String text) {
        LOG.info(text);
    }

    /**
     * Returns the name of the destination used in this test case
     */
    protected String getDestinationString() {
        return getClass().getName() + "." + getName(true);
    }
}