/**
 * 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.store.kahadb;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.BaseDestination;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.usage.StoreUsage;
import org.apache.activemq.util.IOHelper;
import org.apache.activemq.util.Wait;
import org.junit.After;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.jms.BytesMessage;
import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

import static org.junit.Assert.*;

public class MKahaDBStoreLimitTest {

    private static final Logger LOG = LoggerFactory.getLogger(MKahaDBStoreLimitTest.class);

    final ActiveMQQueue queueA = new ActiveMQQueue("Q.A");
    final ActiveMQQueue queueB = new ActiveMQQueue("Q.B");

    private BrokerService broker;

    @After
    public void stopBroker() throws Exception {
        if (broker != null) {
            broker.stop();
            broker.waitUntilStopped();
        }
    }

    private BrokerService createBroker(MultiKahaDBPersistenceAdapter persistenceAdapter) throws Exception {
        broker = new BrokerService();
        broker.setPersistenceAdapter(persistenceAdapter);
        broker.setUseJmx(false);
        broker.setAdvisorySupport(false);
        broker.setSchedulerSupport(false);
        broker.setPersistenceAdapter(persistenceAdapter);
        broker.setDeleteAllMessagesOnStartup(true);
        return broker;
    }

    @Test
    public void testPerDestUsage() throws Exception {

        // setup multi-kaha adapter
        MultiKahaDBPersistenceAdapter persistenceAdapter = new MultiKahaDBPersistenceAdapter();

        KahaDBPersistenceAdapter kahaStore = new KahaDBPersistenceAdapter();
        kahaStore.setJournalMaxFileLength(1024 * 5);
        kahaStore.setCleanupInterval(1000);

        // set up a store per destination
        FilteredKahaDBPersistenceAdapter filtered = new FilteredKahaDBPersistenceAdapter();
        StoreUsage storeUsage = new StoreUsage();
        storeUsage.setPercentLimit(10);
        storeUsage.setTotal(1024*1024*10);
        filtered.setUsage(storeUsage);
        filtered.setPersistenceAdapter(kahaStore);
        filtered.setPerDestination(true);
        List<FilteredKahaDBPersistenceAdapter> stores = new ArrayList<>();
        stores.add(filtered);

        persistenceAdapter.setFilteredPersistenceAdapters(stores);

        createBroker(persistenceAdapter).start();



        produceMessages(queueA, 20);
        produceMessages(queueB, 0);

        LOG.info("Store global u: " + broker.getSystemUsage().getStoreUsage().getUsage() + ", %:" + broker.getSystemUsage().getStoreUsage().getPercentUsage());

        assertTrue("some usage", broker.getSystemUsage().getStoreUsage().getUsage() > 0);

        BaseDestination baseDestinationA = (BaseDestination) broker.getRegionBroker().getDestinationMap().get(queueA);
        BaseDestination baseDestinationB = (BaseDestination) broker.getRegionBroker().getDestinationMap().get(queueB);

        LOG.info("Store A u: " + baseDestinationA.getSystemUsage().getStoreUsage().getUsage() + ", %: " + baseDestinationA.getSystemUsage().getStoreUsage().getPercentUsage());

        assertTrue(baseDestinationA.getSystemUsage().getStoreUsage().getUsage() > 0);

        produceMessages(queueB, 40);
        assertTrue(baseDestinationB.getSystemUsage().getStoreUsage().getUsage() > 0);
        assertTrue(baseDestinationB.getSystemUsage().getStoreUsage().getUsage() > baseDestinationA.getSystemUsage().getStoreUsage().getUsage());

        LOG.info("Store B u: " + baseDestinationB.getSystemUsage().getStoreUsage().getUsage() + ", %: " + baseDestinationB.getSystemUsage().getStoreUsage().getPercentUsage());
        LOG.info("Store global u: " + broker.getSystemUsage().getStoreUsage().getUsage() + ", %:" + broker.getSystemUsage().getStoreUsage().getPercentUsage());

        consume(queueA);

        consume(queueB);

        LOG.info("Store global u: " + broker.getSystemUsage().getStoreUsage().getUsage() + ", %:" + broker.getSystemUsage().getStoreUsage().getPercentUsage());
        LOG.info("Store A u: " + baseDestinationA.getSystemUsage().getStoreUsage().getUsage() + ", %: " + baseDestinationA.getSystemUsage().getStoreUsage().getPercentUsage());
        LOG.info("Store B u: " + baseDestinationB.getSystemUsage().getStoreUsage().getUsage() + ", %: " + baseDestinationB.getSystemUsage().getStoreUsage().getPercentUsage());

    }

    @Test
    public void testExplicitAdapter() throws Exception {
        MultiKahaDBPersistenceAdapter persistenceAdapter = new MultiKahaDBPersistenceAdapter();
        KahaDBPersistenceAdapter kahaStore = new KahaDBPersistenceAdapter();
        kahaStore.setJournalMaxFileLength(1024*25);

        FilteredKahaDBPersistenceAdapter filtered = new FilteredKahaDBPersistenceAdapter();
        StoreUsage storeUsage = new StoreUsage();
        storeUsage.setPercentLimit(50);
        storeUsage.setTotal(512*1024);

        filtered.setUsage(storeUsage);
        filtered.setDestination(queueA);
        filtered.setPersistenceAdapter(kahaStore);
        List<FilteredKahaDBPersistenceAdapter> stores = new ArrayList<>();
        stores.add(filtered);

        persistenceAdapter.setFilteredPersistenceAdapters(stores);

        BrokerService brokerService = createBroker(persistenceAdapter);
        brokerService.getSystemUsage().getStoreUsage().setTotal(1024*1024);
        brokerService.start();


        produceMessages(queueA, 20);

        LOG.info("Store global u: " + broker.getSystemUsage().getStoreUsage().getUsage() + ", %:" + broker.getSystemUsage().getStoreUsage().getPercentUsage());

        assertTrue("some usage", broker.getSystemUsage().getStoreUsage().getUsage() > 0);

        BaseDestination baseDestinationA = (BaseDestination) broker.getRegionBroker().getDestinationMap().get(queueA);
        LOG.info("Store A u: " + baseDestinationA.getSystemUsage().getStoreUsage().getUsage() + ", %: " + baseDestinationA.getSystemUsage().getStoreUsage().getPercentUsage());

        assertTrue("limited store has more % usage than parent", baseDestinationA.getSystemUsage().getStoreUsage().getPercentUsage() > broker.getSystemUsage().getStoreUsage().getPercentUsage());

    }

    @Test
    public void testExplicitAdapterBlockingProducer() throws Exception {
        MultiKahaDBPersistenceAdapter persistenceAdapter = new MultiKahaDBPersistenceAdapter();
        KahaDBPersistenceAdapter kahaStore = new KahaDBPersistenceAdapter();
        kahaStore.setJournalMaxFileLength(1024*8);
        kahaStore.setIndexDirectory(new File(IOHelper.getDefaultDataDirectory()));

        FilteredKahaDBPersistenceAdapter filtered = new FilteredKahaDBPersistenceAdapter();
        StoreUsage storeUsage = new StoreUsage();
        storeUsage.setLimit(44*1024);

        filtered.setUsage(storeUsage);
        filtered.setDestination(queueA);
        filtered.setPersistenceAdapter(kahaStore);
        List<FilteredKahaDBPersistenceAdapter> stores = new ArrayList<>();
        stores.add(filtered);

        persistenceAdapter.setFilteredPersistenceAdapters(stores);

        BrokerService brokerService = createBroker(persistenceAdapter);
        brokerService.start();

        final AtomicBoolean done = new AtomicBoolean();
        ExecutorService executor = Executors.newCachedThreadPool();
        executor.submit(new Runnable() {
            @Override
            public void run() {
                try {
                    produceMessages(queueA, 20);
                    done.set(true);
                } catch (Exception ignored) {
                }
            }
        });

        assertTrue("some messages got to dest", Wait.waitFor(new Wait.Condition() {
            @Override
            public boolean isSatisified() throws Exception {
                BaseDestination baseDestinationA = (BaseDestination) broker.getRegionBroker().getDestinationMap().get(queueA);
                return baseDestinationA != null && baseDestinationA.getDestinationStatistics().getMessages().getCount() > 4l;
            }
        }));

        BaseDestination baseDestinationA = (BaseDestination) broker.getRegionBroker().getDestinationMap().get(queueA);
        // loop till producer stalled
        long enqueues = 0l;
        do {
            enqueues = baseDestinationA.getDestinationStatistics().getEnqueues().getCount();
            LOG.info("Dest Enqueues: " + enqueues);
            TimeUnit.MILLISECONDS.sleep(500);
        } while (enqueues != baseDestinationA.getDestinationStatistics().getEnqueues().getCount());


        assertFalse("expect producer to block", done.get());

        LOG.info("Store global u: " + broker.getSystemUsage().getStoreUsage().getUsage() + ", %:" + broker.getSystemUsage().getStoreUsage().getPercentUsage());

        assertTrue("some usage", broker.getSystemUsage().getStoreUsage().getUsage() > 0);

        LOG.info("Store A u: " + baseDestinationA.getSystemUsage().getStoreUsage().getUsage() + ", %: " + baseDestinationA.getSystemUsage().getStoreUsage().getPercentUsage());

        assertTrue("limited store has more % usage than parent", baseDestinationA.getSystemUsage().getStoreUsage().getPercentUsage() > broker.getSystemUsage().getStoreUsage().getPercentUsage());

        executor.shutdownNow();
    }


    private void consume(Destination queue) throws Exception {
        ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory("vm://localhost?create=false");
        Connection connection = cf.createConnection();
        connection.start();
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        MessageConsumer consumer = session.createConsumer(queue);
        for (int i = 0; i < 5; ++i) {
            assertNotNull("message[" + i + "]", consumer.receive(4000));
        }
        connection.close();
    }

    private void produceMessages(Destination queue, int count) throws Exception {
        ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory("vm://localhost?create=false");
        Connection connection = cf.createConnection();
        connection.start();
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        MessageProducer producer = session.createProducer(queue);
        BytesMessage bytesMessage = session.createBytesMessage();
        bytesMessage.writeBytes(new byte[1*1024]);
        for (int i = 0; i < count; ++i) {
            producer.send(bytesMessage);
        }
        connection.close();
    }
}
