PollCommand.java

/*
 * Copyright 2014-2016 CyberVision, Inc.
 *
 * Licensed 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.kaaproject.kaa.client.channel.impl.channels.polling;

import org.kaaproject.kaa.client.channel.ChannelDirection;
import org.kaaproject.kaa.client.channel.IpTransportInfo;
import org.kaaproject.kaa.client.transport.AbstractHttpClient;
import org.kaaproject.kaa.common.TransportType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.LinkedHashMap;
import java.util.Map;

public class PollCommand implements Command {

  public static final Logger LOG = LoggerFactory //NOSONAR
      .getLogger(PollCommand.class);

  private final AbstractHttpClient httpClient;
  private final RawDataProcessor processor;
  private final Map<TransportType, ChannelDirection> transportTypes;
  private final IpTransportInfo serverInfo;
  private volatile boolean canceled = false;

  /**
   * All-args constructor.
   */
  public PollCommand(AbstractHttpClient client, RawDataProcessor processor, Map<TransportType,
          ChannelDirection> transportTypes, IpTransportInfo serverInfo) {
    this.httpClient = client;
    this.serverInfo = serverInfo;
    this.processor = processor;
    this.transportTypes = transportTypes;
  }

  @Override
  public void execute() {
    try {
      if (httpClient != null) {
        LinkedHashMap<String, byte[]> request = processor.createRequest(transportTypes); //NOSONAR
        if (request != null && !canceled) {
          byte[] responseDataRaw = httpClient.executeHttpRequest("", request, false);
          processor.onResponse(responseDataRaw);
        }
      } else {
        LOG.warn("Unable to execute http request, http client is null.");
      }
    } catch (Exception ex) {
      if (!canceled) {
        LOG.error("Server failed {}", ex);
      } else {
        LOG.debug("PollCommand execution aborted");
      }
      processor.onServerError(serverInfo);
    }
  }

  @Override
  public void cancel() {
    canceled = true;
    if (httpClient != null && httpClient.canAbort()) {
      httpClient.abort();
    }
  }

}