content: /*
   * 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.camel.component.ignite.events;
  
  import java.lang.reflect.Field;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.camel.Category;
  import org.apache.camel.Consumer;
  import org.apache.camel.Processor;
  import org.apache.camel.Producer;
  import org.apache.camel.component.ignite.AbstractIgniteEndpoint;
  import org.apache.camel.component.ignite.ClusterGroupExpression;
  import org.apache.camel.spi.UriEndpoint;
  import org.apache.camel.spi.UriParam;
  import org.apache.camel.spi.UriPath;
  import org.apache.ignite.Ignite;
  import org.apache.ignite.IgniteEvents;
  import org.apache.ignite.cluster.ClusterGroup;
  import org.apache.ignite.events.EventType;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static org.apache.camel.component.ignite.IgniteConstants.SCHEME_EVENTS;
  
  /**
   * <a href="https://apacheignite.readme.io/docs/events">Receive events</a> from an Ignite cluster by creating a local
   * event listener.
   *
   * This endpoint only supports consumers. The Exchanges created by this consumer put the received Event object into the
   * body of the IN message.
   */
  @UriEndpoint(firstVersion = "2.17.0", scheme = SCHEME_EVENTS, title = "Ignite Events", syntax = "ignite-events:endpointId",
               category = { Category.MESSAGING, Category.CACHE, Category.CLUSTERING },
               consumerOnly = true)
  public class IgniteEventsEndpoint extends AbstractIgniteEndpoint {
  
      private static final Logger LOG = LoggerFactory.getLogger(IgniteEventsEndpoint.class);
  
      @UriPath
      private String endpointId;
  
      @UriParam(label = "consumer", defaultValue = "EVTS_ALL")
      private String events = "EVTS_ALL";
  
      @UriParam(label = "consumer")
      private ClusterGroupExpression clusterGroupExpression;
  
      public IgniteEventsEndpoint(String uri, String remaining, Map<String, Object> parameters,
                                  IgniteEventsComponent igniteComponent) {
          super(uri, igniteComponent);
      }
  
      @Override
      public Producer createProducer() throws Exception {
          throw new UnsupportedOperationException("The Ignite Events endpoint does not support producers.");
      }
  
      @Override
      public Consumer createConsumer(Processor processor) throws Exception {
          // Initialize the Consumer.
          IgniteEvents igniteEvents = createIgniteEvents();
          IgniteEventsConsumer consumer = new IgniteEventsConsumer(this, processor, igniteEvents);
          configureConsumer(consumer);
  
          LOG.info("Created Ignite Events consumer for event types: {}.", igniteEvents);
  
          return consumer;
      }
  
      private IgniteEvents createIgniteEvents() {
          Ignite ignite = ignite();
          IgniteEvents igniteEvents;
          if (clusterGroupExpression == null) {
              LOG.info("Ignite Events endpoint for event types {} using no Cluster Group.", this.events);
              igniteEvents = ignite.events();
          } else {
              ClusterGroup group = clusterGroupExpression.getClusterGroup(ignite);
              LOG.info("Ignite Events endpoint for event types {} using Cluster Group: {}.", this.events, group);
              igniteEvents = ignite.events(group);
          }
          return igniteEvents;
      }
  
      /**
       * Gets the endpoint ID (not used).
       */
      public String getEndpointId() {
          return endpointId;
      }
  
      /**
       * The endpoint ID (not used).
       */
      public void setEndpointId(String endpointId) {
          this.endpointId = endpointId;
      }
  
      /**
       * Gets the event types to subscribe to.
       */
      public String getEvents() {
          return events;
      }
  
      /**
       * The event types to subscribe to as a comma-separated string of event constants as defined in {@link EventType}.
       * For example: EVT_CACHE_ENTRY_CREATED,EVT_CACHE_OBJECT_REMOVED,EVT_IGFS_DIR_CREATED.
       */
      public void setEvents(String events) {
          this.events = events;
      }
  
      public List<Integer> getEventsAsIds() {
          List<Integer> answer = new ArrayList<>();
  
          if (events.equals("EVTS_ALL")) {
              for (Integer eventType : EventType.EVTS_ALL) {
                  answer.add(eventType);
              }
          } else {
              Set<String> requestedEvents = new HashSet<>(Arrays.asList(events.toUpperCase().split(",")));
              Field[] fields = EventType.class.getDeclaredFields();
              for (Field field : fields) {
                  if (!requestedEvents.contains(field.getName())) {
                      continue;
                  }
                  try {
                      answer.add(field.getInt(null));
                  } catch (Exception e) {
                      throw new IllegalArgumentException("Problem while resolving event type. See stacktrace.", e);
                  }
              }
          }
  
          return answer;
      }
  
      /**
       * Gets the cluster group expression.
       */
      public ClusterGroupExpression getClusterGroupExpression() {
          return clusterGroupExpression;
      }
  
      /**
       * The cluster group expression.
       */
      public void setClusterGroupExpression(ClusterGroupExpression clusterGroupExpression) {
          this.clusterGroupExpression = clusterGroupExpression;
      }
  
  }
  