Java DescribeInstanceStatusResult.getNextToken方法代码示例

import com.amazonaws.services.ec2.model.DescribeInstanceStatusResult; //导入方法依赖的package包/类
private List<InstanceStatus> getInstancesStatusByZone(AvailabilityZone zone,
                                                      AmazonEC2Client client) {

  // Create this list to capture paginated async results from aws sdk
  List<InstanceStatus> statusList = new ArrayList<>();

  // Create an initial request object
  DescribeInstanceStatusRequest statusRequest = new DescribeInstanceStatusRequest()
      .withMaxResults(1000)
      .withFilters(new Filter("availability-zone", Arrays.asList(zone.getZoneName())))
      .withSdkClientExecutionTimeout(600 * 1000)
      .withSdkRequestTimeout(300 * 1000);

  // Make the request for instanceStatus
  DescribeInstanceStatusResult result = client.describeInstanceStatus(statusRequest);

  // Until more results are available we loop through this code
  while (result != null) {

    statusList.addAll(result.getInstanceStatuses());

    if (result.getNextToken() != null) {

      statusRequest.setNextToken(result.getNextToken());
      result = client.describeInstanceStatus(statusRequest);

    } else {
      result = null;
    }
  }

  // Return all statuses as a list of InstanceStatus objects
  return statusList;
}
 

import com.amazonaws.services.ec2.model.DescribeInstanceStatusResult; //导入方法依赖的package包/类
/**
 * Returns a map from virtual instance IDs to instance state for the specified batch of virtual
 * instance IDs.
 *
 * @param virtualInstanceIds batch of virtual instance IDs
 * @return the map from instance IDs to instance state for the specified batch of virtual
 * instance IDs
 */
private Map<String, InstanceState> getBatchInstanceState(Collection<String> virtualInstanceIds) {
  Map<String, InstanceState> instanceStateByVirtualInstanceId =
      Maps.newHashMapWithExpectedSize(virtualInstanceIds.size());

  BiMap<String, String> virtualInstanceIdsByEC2InstanceId =
      getEC2InstanceIdsByVirtualInstanceId(virtualInstanceIds).inverse();

  int page = 0;
  LOG.info(">> Fetching page {}", page);

  if (virtualInstanceIdsByEC2InstanceId.isEmpty()) {
    // No EC2 instances are found, which means these id's are already terminated and gone.
    // In practice, this is possible when no instances were provisioned to begin with.
    // For example, when a deployment fails due to tagging error.
    return instanceStateByVirtualInstanceId;
  }

  DescribeInstanceStatusResult result = client.describeInstanceStatus(
      new DescribeInstanceStatusRequest()
          // Note that sending in an empty set will result in fetching _all_ instance Ids.
          // It requires you to send one or more EC2 Ids
          .withInstanceIds(virtualInstanceIdsByEC2InstanceId.keySet())
          .withIncludeAllInstances(true)
  );
  LOG.info("<< Result: {}", result);

  while (!result.getInstanceStatuses().isEmpty()) {
    for (InstanceStatus status : result.getInstanceStatuses()) {

      InstanceStateName currentState =
          InstanceStateName.fromValue(status.getInstanceState().getName());
      String ec2InstanceId = status.getInstanceId();
      String virtualInstanceId = virtualInstanceIdsByEC2InstanceId.get(ec2InstanceId);
      InstanceState instanceState = EC2InstanceState.fromInstanceStateName(currentState);
      instanceStateByVirtualInstanceId.put(virtualInstanceId, instanceState);
    }

    String nextToken = result.getNextToken();
    if (nextToken != null) {
      page++;
      LOG.info(">> Fetching page {} using token {}", page, nextToken);
      result = client.describeInstanceStatus(new DescribeInstanceStatusRequest()
          .withNextToken(nextToken));
      LOG.info("<< Result: {}", result);
    } else {
      break;
    }
  }

  return instanceStateByVirtualInstanceId;
}