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.queue;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.camel.AsyncCallback;
  import org.apache.camel.Exchange;
  import org.apache.camel.Message;
  import org.apache.camel.component.ignite.IgniteConstants;
  import org.apache.camel.support.DefaultAsyncProducer;
  import org.apache.camel.support.MessageHelper;
  import org.apache.ignite.IgniteQueue;
  
  public class IgniteQueueProducer extends DefaultAsyncProducer {
  
      private IgniteQueueEndpoint endpoint;
      private IgniteQueue<Object> queue;
  
      public IgniteQueueProducer(IgniteQueueEndpoint endpoint, IgniteQueue<Object> queue) {
          super(endpoint);
          this.endpoint = endpoint;
          this.queue = queue;
      }
  
      @Override
      @SuppressWarnings("unchecked")
      public boolean process(Exchange exchange, AsyncCallback callback) {
          Message in = exchange.getIn();
          Message out = exchange.getOut();
          MessageHelper.copyHeaders(exchange.getIn(), out, true);
  
          Object body = in.getBody();
          Long millis;
  
          switch (queueOperationFor(exchange)) {
  
              case ADD:
                  if (Collection.class.isAssignableFrom(body.getClass()) && !endpoint.isTreatCollectionsAsCacheObjects()) {
                      out.setBody(queue.addAll((Collection<? extends Object>) body));
                  } else {
                      out.setBody(queue.add(body));
                  }
                  break;
  
              case CONTAINS:
                  if (Collection.class.isAssignableFrom(body.getClass()) && !endpoint.isTreatCollectionsAsCacheObjects()) {
                      out.setBody(queue.containsAll((Collection<? extends Object>) body));
                  } else {
                      out.setBody(queue.contains(body));
                  }
                  break;
  
              case SIZE:
                  out.setBody(queue.size());
                  break;
  
              case REMOVE:
                  if (Collection.class.isAssignableFrom(body.getClass()) && !endpoint.isTreatCollectionsAsCacheObjects()) {
                      out.setBody(queue.removeAll((Collection<? extends Object>) body));
                  } else {
                      out.setBody(queue.remove(body));
                  }
                  break;
  
              case CLEAR:
                  if (endpoint.isPropagateIncomingBodyIfNoReturnValue()) {
                      out.setBody(body);
                  }
                  queue.clear();
                  break;
  
              case ITERATOR:
                  Iterator<?> iterator = queue.iterator();
                  out.setBody(iterator);
                  break;
  
              case ARRAY:
                  out.setBody(queue.toArray());
                  break;
  
              case RETAIN_ALL:
                  if (Collection.class.isAssignableFrom(body.getClass())) {
                      out.setBody(queue.retainAll((Collection<? extends Object>) body));
                  } else {
                      out.setBody(queue.retainAll(Collections.singleton(body)));
                  }
                  break;
  
              case DRAIN:
                  Integer maxElements = in.getHeader(IgniteConstants.IGNITE_QUEUE_MAX_ELEMENTS, Integer.class);
  
                  Collection<Object> col = null;
                  if (body != null && Collection.class.isAssignableFrom(body.getClass())) {
                      col = (Collection<Object>) body;
                  } else {
                      col = maxElements != null ? new ArrayList<>(maxElements) : new ArrayList<>();
                  }
  
                  int transferred = -1;
                  if (maxElements == null) {
                      transferred = queue.drainTo(col);
                  } else {
                      transferred = queue.drainTo(col, maxElements);
                  }
                  out.setBody(col);
                  out.setHeader(IgniteConstants.IGNITE_QUEUE_TRANSFERRED_COUNT, transferred);
                  break;
  
              case ELEMENT:
                  out.setBody(queue.element());
                  break;
  
              case OFFER:
                  millis = in.getHeader(IgniteConstants.IGNITE_QUEUE_TIMEOUT_MILLIS, endpoint.getTimeoutMillis(), Long.class);
                  boolean result = millis == null ? queue.offer(body) : queue.offer(body, millis, TimeUnit.MILLISECONDS);
                  out.setBody(result);
                  break;
  
              case PEEK:
                  out.setBody(queue.peek());
                  break;
  
              case POLL:
                  millis = in.getHeader(IgniteConstants.IGNITE_QUEUE_TIMEOUT_MILLIS, endpoint.getTimeoutMillis(), Long.class);
                  out.setBody(millis == null ? queue.poll() : queue.poll(millis, TimeUnit.MILLISECONDS));
                  break;
  
              case PUT:
                  if (endpoint.isPropagateIncomingBodyIfNoReturnValue()) {
                      out.setBody(in.getBody());
                  }
                  queue.put(body);
                  break;
  
              case TAKE:
                  out.setBody(queue.take());
                  break;
  
              default:
                  exchange.setException(new UnsupportedOperationException("Operation not supported by Ignite Queue producer."));
                  break;
          }
  
          callback.done(false);
          return false;
      }
  
      private IgniteQueueOperation queueOperationFor(Exchange exchange) {
          return exchange.getIn().getHeader(IgniteConstants.IGNITE_QUEUE_OPERATION, endpoint.getOperation(),
                  IgniteQueueOperation.class);
      }
  
  }
  