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A simple java rest client to interact with the Databricks Rest Service https://docs.databricks.com/api/latest/index.html

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/*
 * Copyright 2018 Edmunds.com, 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 com.edmunds.rest.databricks;

import java.util.HashSet;
import java.util.Set;
import org.apache.http.HttpResponse;
import org.apache.http.client.ServiceUnavailableRetryStrategy;
import org.apache.http.protocol.HttpContext;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * Retry Strategy when get HTTP response status code. ref> https://en.wikipedia.org/wiki/List_of_HTTP_status_codes
 */
public class HttpServiceUnavailableRetryStrategy implements ServiceUnavailableRetryStrategy {

  private static final Set retryStatusSet = new HashSet<>();
  private static Logger logger = LogManager
      .getLogger(HttpServiceUnavailableRetryStrategy.class.getName());

  static {
    retryStatusSet.add(408); // Request Timeout
    retryStatusSet.add(429); // Too Many Requests

    retryStatusSet.add(500); // Internal Server Error
    retryStatusSet.add(503); // Service Unavailable
    retryStatusSet.add(504); // Gateway Timeout
  }

  // milliseconds
  private long retryInterval;
  private int maxRetries;

  private int executeCount = 0;

  public HttpServiceUnavailableRetryStrategy() {
    this(3, 10000L);
  }

  public HttpServiceUnavailableRetryStrategy(int maxRetries, long retryInterval) {
    this.maxRetries = maxRetries;
    this.retryInterval = retryInterval;
  }

  @Override
  public boolean retryRequest(final HttpResponse response, final int executionCount,
      final HttpContext context) {
    this.executeCount = executionCount;

    boolean isRetry = executionCount <= this.maxRetries && retryStatusSet
        .contains(response.getStatusLine().getStatusCode());
    if (isRetry) {
      logger.warn(
          "Retry HttpRequest " + executionCount + "th. statusCode=" + response.getStatusLine()
              .getStatusCode());
    }

    return isRetry;
  }

  @Override
  public long getRetryInterval() {
    return retryInterval;
  }

  public int getExecuteCount() {
    return executeCount;
  }
}