/**
 * 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.region;

import javax.jms.Connection;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import java.util.ArrayList;
import java.util.List;

import org.apache.activemq.EmbeddedBrokerTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.policy.ConstantPendingMessageLimitStrategy;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.apache.activemq.broker.region.policy.UniquePropertyMessageEvictionStrategy;

public class UniquePropertyMessageEvictionStrategyTest extends EmbeddedBrokerTestSupport {

   @Override
   protected BrokerService createBroker() throws Exception {
      BrokerService broker = super.createBroker();
      final List<PolicyEntry> policyEntries = new ArrayList<>();
      final PolicyEntry entry = new PolicyEntry();
      entry.setTopic(">");

      entry.setAdvisoryForDiscardingMessages(true);
      entry.setTopicPrefetch(1);

      ConstantPendingMessageLimitStrategy pendingMessageLimitStrategy = new ConstantPendingMessageLimitStrategy();
      pendingMessageLimitStrategy.setLimit(10);
      entry.setPendingMessageLimitStrategy(pendingMessageLimitStrategy);

      UniquePropertyMessageEvictionStrategy messageEvictionStrategy = new UniquePropertyMessageEvictionStrategy();
      messageEvictionStrategy.setPropertyName("sequenceI");
      entry.setMessageEvictionStrategy(messageEvictionStrategy);

      // let evicted messages disappear
      entry.setDeadLetterStrategy(null);
      policyEntries.add(entry);

      final PolicyMap policyMap = new PolicyMap();
      policyMap.setPolicyEntries(policyEntries);
      broker.setDestinationPolicy(policyMap);

      return broker;
   }

   public void testEviction() throws Exception {
      Connection conn = connectionFactory.createConnection();
      conn.start();
      Session session = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
      javax.jms.Topic destination = session.createTopic("TEST");

      MessageProducer producer = session.createProducer(destination);
      MessageConsumer consumer = session.createConsumer(destination);

      for (int i = 0; i < 10; i++) {
         for (int j = 0; j < 10; j++) {
            TextMessage msg = session.createTextMessage("message " + i + j);
            msg.setIntProperty("sequenceI", i);
            msg.setIntProperty("sequenceJ", j);
            producer.send(msg);
            Thread.sleep(100);
         }
      }

      for (int i = 0; i < 11; i++) {
         javax.jms.Message msg = consumer.receive(1000);
         assertNotNull(msg);
         int seqI = msg.getIntProperty("sequenceI");
         int seqJ = msg.getIntProperty("sequenceJ");
         if (i == 0) {
            assertEquals(0, seqI);
            assertEquals(0, seqJ);
         } else {
            assertEquals(9, seqJ);
            assertEquals(i - 1, seqI);
         }
         //System.out.println(msg.getIntProperty("sequenceI") + " " + msg.getIntProperty("sequenceJ"));
      }

      javax.jms.Message msg = consumer.receive(1000);
      assertNull(msg);

   }

}
