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.ironmq;
  
  import java.util.LinkedList;
  import java.util.Queue;
  
  import io.iron.ironmq.EmptyQueueException;
  import io.iron.ironmq.Message;
  import io.iron.ironmq.Messages;
  import org.apache.camel.Endpoint;
  import org.apache.camel.Exchange;
  import org.apache.camel.ExchangePropertyKey;
  import org.apache.camel.Processor;
  import org.apache.camel.spi.ScheduledPollConsumerScheduler;
  import org.apache.camel.spi.Synchronization;
  import org.apache.camel.support.DefaultScheduledPollConsumerScheduler;
  import org.apache.camel.support.ExchangeHelper;
  import org.apache.camel.support.ScheduledBatchPollingConsumer;
  import org.apache.camel.util.CastUtils;
  import org.apache.camel.util.ObjectHelper;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * The IronMQ consumer.
   */
  public class IronMQConsumer extends ScheduledBatchPollingConsumer {
  
      private static final Logger LOG = LoggerFactory.getLogger(IronMQConsumer.class);
  
      private io.iron.ironmq.Queue ironQueue;
  
      public IronMQConsumer(Endpoint endpoint, Processor processor) {
          super(endpoint, processor);
      }
  
      @Override
      protected void afterConfigureScheduler(ScheduledPollConsumerScheduler scheduler, boolean newScheduler) {
          if (newScheduler && scheduler instanceof DefaultScheduledPollConsumerScheduler) {
              DefaultScheduledPollConsumerScheduler ds = (DefaultScheduledPollConsumerScheduler) scheduler;
              ds.setConcurrentConsumers(getEndpoint().getConfiguration().getConcurrentConsumers());
              // if using concurrent consumers then resize pool to be at least same size
              int ps = Math.max(ds.getPoolSize(), getEndpoint().getConfiguration().getConcurrentConsumers());
              ds.setPoolSize(ps);
          }
      }
  
      @Override
      protected void doStart() throws Exception {
          super.doStart();
          ironQueue = getEndpoint().getClient().queue(getEndpoint().getConfiguration().getQueueName());
      }
  
      @Override
      protected int poll() throws Exception {
          // must reset for each poll
          shutdownRunningTask = null;
          pendingExchanges = 0;
          try {
              Messages messages;
              LOG.trace("Receiving messages with request [messagePerPoll {}, timeout {}]...", getMaxMessagesPerPoll(),
                      getEndpoint().getConfiguration().getTimeout());
              messages = this.ironQueue.reserve(getMaxMessagesPerPoll(), getEndpoint().getConfiguration().getTimeout(),
                      getEndpoint().getConfiguration().getWait());
              LOG.trace("Received {} messages", messages.getSize());
  
              // okay we have some response from ironmq so lets mark the consumer as ready
              forceConsumerAsReady();
  
              Queue<Exchange> exchanges = createExchanges(messages.getMessages());
              int noProcessed = processBatch(CastUtils.cast(exchanges));
              // delete all processed messages in one batch;
              if (getEndpoint().getConfiguration().isBatchDelete()) {
                  LOG.trace("Batch deleting {} messages", messages.getSize());
                  this.ironQueue.deleteMessages(messages);
              }
              return noProcessed;
          } catch (EmptyQueueException e) {
              return 0;
          }
      }
  
      protected Queue<Exchange> createExchanges(Message[] messages) {
          LOG.trace("Received {} messages in this poll", messages.length);
  
          Queue<Exchange> answer = new LinkedList<>();
          for (Message message : messages) {
              Exchange exchange = createExchange(message);
              answer.add(exchange);
          }
          return answer;
      }
  
      @Override
      public int processBatch(Queue<Object> exchanges) throws Exception {
          int total = exchanges.size();
  
          for (int index = 0; index < total && isBatchAllowed(); index++) {
              // only loop if we are started (allowed to run)
              final Exchange exchange = ObjectHelper.cast(Exchange.class, exchanges.poll());
              // add current index and total as properties
              exchange.setProperty(ExchangePropertyKey.BATCH_INDEX, index);
              exchange.setProperty(ExchangePropertyKey.BATCH_SIZE, total);
              exchange.setProperty(ExchangePropertyKey.BATCH_COMPLETE, index == total - 1);
  
              // update pending number of exchanges
              pendingExchanges = total - index - 1;
  
              // add on completion to handle after work when the exchange is done
              // if batchDelete is not enabled
              if (!getEndpoint().getConfiguration().isBatchDelete()) {
                  exchange.getExchangeExtension().addOnCompletion(new Synchronization() {
                      final String reservationId
                              = ExchangeHelper.getMandatoryHeader(exchange, IronMQConstants.MESSAGE_RESERVATION_ID, String.class);
                      final String messageid
                              = ExchangeHelper.getMandatoryHeader(exchange, IronMQConstants.MESSAGE_ID, String.class);
  
                      public void onComplete(Exchange exchange) {
                          processCommit(exchange, messageid, reservationId);
                      }
  
                      public void onFailure(Exchange exchange) {
                          processRollback(exchange);
                      }
  
                      @Override
                      public String toString() {
                          return "IronMQConsumerOnCompletion";
                      }
                  });
              }
  
              LOG.trace("Processing exchange [{}]...", exchange);
  
              getProcessor().process(exchange);
          }
  
          return total;
      }
  
      /**
       * Strategy to delete the message after being processed.
       *
       * @param exchange the exchange
       */
      protected void processCommit(Exchange exchange, String messageid, String reservationId) {
          try {
              LOG.trace("Deleting message with messageId {} and reservationId {}...", messageid, reservationId);
              this.ironQueue.deleteMessage(messageid, reservationId);
              LOG.trace("Message deleted");
          } catch (Exception e) {
              getExceptionHandler().handleException("Error occurred during delete of message. This exception is ignored.",
                      exchange, e);
          }
      }
  
      /**
       * Strategy when processing the exchange failed.
       *
       * @param exchange the exchange
       */
      protected void processRollback(Exchange exchange) {
          Exception cause = exchange.getException();
          if (cause != null) {
              LOG.warn("Exchange failed, so rolling back message status: {}", exchange, cause);
          } else {
              LOG.warn("Exchange failed, so rolling back message status: {}", exchange);
          }
      }
  
      @Override
      public IronMQEndpoint getEndpoint() {
          return (IronMQEndpoint) super.getEndpoint();
      }
  
      private Exchange createExchange(io.iron.ironmq.Message msg) {
          Exchange exchange = createExchange(true);
          exchange.setPattern(getEndpoint().getExchangePattern());
          org.apache.camel.Message message = exchange.getIn();
          if (getEndpoint().getConfiguration().isPreserveHeaders()) {
              GsonUtil.copyFrom(msg, message);
          } else {
              message.setBody(msg.getBody());
          }
          message.setHeader(IronMQConstants.MESSAGE_ID, msg.getId());
          message.setHeader(IronMQConstants.MESSAGE_RESERVATION_ID, msg.getReservationId());
          message.setHeader(IronMQConstants.MESSAGE_RESERVED_COUNT, msg.getReservedCount());
          return exchange;
      }
  
  }
  