content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.common;
  
  import alluxio.HealthCheckClient;
  import alluxio.conf.AlluxioConfiguration;
  import alluxio.exception.status.AlluxioStatusException;
  import alluxio.exception.status.NotFoundException;
  import alluxio.exception.status.UnavailableException;
  import alluxio.grpc.ServiceType;
  import alluxio.retry.RetryPolicy;
  import alluxio.security.user.UserState;
  import alluxio.util.network.NetworkAddressUtils;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.net.InetSocketAddress;
  import java.util.function.Supplier;
  
  /**
   * RpcPortHealthCheckClient check if worker is serving RPC.
   */
  public class RpcPortHealthCheckClient implements HealthCheckClient {
    private static final Logger LOG = LoggerFactory.getLogger(RpcPortHealthCheckClient.class);
  
    private final InetSocketAddress mNodeAddress;
    private final ServiceType mServiceType;
    private final Supplier<RetryPolicy> mRetryPolicySupplier;
    private final AlluxioConfiguration mConf;
    private final UserState mUserState;
  
    /**
     * Creates a worker health check client.
     *
     * @param nodeAddress The potential node address
     * @param serviceType The type of service
     * @param retryPolicySupplier the retry policy supplier
     * @param alluxioConf Alluxio configuration
     */
    public RpcPortHealthCheckClient(InetSocketAddress nodeAddress,
        ServiceType serviceType,
        Supplier<RetryPolicy> retryPolicySupplier,
        AlluxioConfiguration alluxioConf) {
      mNodeAddress = nodeAddress;
      mServiceType = serviceType;
      mRetryPolicySupplier = retryPolicySupplier;
      mConf = alluxioConf;
      mUserState = UserState.Factory.create(mConf);
    }
  
    @Override
    public boolean isServing() {
      RetryPolicy retry = mRetryPolicySupplier.get();
      while (retry.attempt()) {
        try {
          LOG.debug("Checking whether {} is listening for RPCs", mNodeAddress);
          NetworkAddressUtils.pingService(mNodeAddress, mServiceType, mConf, mUserState);
          LOG.debug("Successfully connected to {}", mNodeAddress);
          return true;
        } catch (UnavailableException | NotFoundException e) {
          LOG.debug("Failed to connect to {} on attempt #{}", mNodeAddress,
              retry.getAttemptCount());
        } catch (AlluxioStatusException e) {
          throw new RuntimeException(e);
        }
      }
      return false;
    }
  }
  