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Stripe Java Bindings
There is a newer version: 28.2.0
// Generated by delombok at Fri May 01 10:51:46 PDT 2020
package com.stripe.net;

import com.google.gson.Gson;
import com.google.gson.annotations.SerializedName;
import com.stripe.Stripe;
import java.time.Duration;
import java.util.Optional;
import java.util.concurrent.ConcurrentLinkedQueue;

/**
 * Helper class used by {@link LiveStripeResponseGetter} to manage request telemetry.
 */
class RequestTelemetry {
  /**
   * The name of the header used to send request telemetry in requests.
   */
  public static final String HEADER_NAME = "X-Stripe-Client-Telemetry";
  private static final int MAX_REQUEST_METRICS_QUEUE_SIZE = 100;
  private static final Gson gson = new Gson();
  private static ConcurrentLinkedQueue prevRequestMetrics = new ConcurrentLinkedQueue();

  /**
   * Returns an {@link Optional} containing the value of the {@code X-Stripe-Telemetry} header to
   * add to the request. If the header is already present in the request, or if there is available
   * metrics, or if telemetry is disabled, then the returned {@code Optional} is empty.
   *
   * @param headers the request headers
   */
  public Optional getHeaderValue(HttpHeaders headers) {
    if (headers.firstValue(HEADER_NAME).isPresent()) {
      return Optional.empty();
    }
    RequestMetrics requestMetrics = prevRequestMetrics.poll();
    if (requestMetrics == null) {
      return Optional.empty();
    }
    if (!Stripe.enableTelemetry) {
      return Optional.empty();
    }
    ClientTelemetryPayload payload = new ClientTelemetryPayload(requestMetrics);
    return Optional.of(gson.toJson(payload));
  }

  /**
   * If telemetry is enabled and the queue is not full, then enqueue a new metrics item; otherwise,
   * do nothing.
   *
   * @param response the Stripe response
   * @param duration the request duration
   */
  public void maybeEnqueueMetrics(StripeResponse response, Duration duration) {
    if (!Stripe.enableTelemetry) {
      return;
    }
    if (response.requestId() == null) {
      return;
    }
    if (prevRequestMetrics.size() >= MAX_REQUEST_METRICS_QUEUE_SIZE) {
      return;
    }
    RequestMetrics metrics = new RequestMetrics(response.requestId(), duration.toMillis());
    prevRequestMetrics.add(metrics);
  }


  private static class ClientTelemetryPayload {
    @SerializedName("last_request_metrics")
    private final RequestMetrics lastRequestMetrics;

    @java.lang.SuppressWarnings("all")
    @lombok.Generated
    public ClientTelemetryPayload(final RequestMetrics lastRequestMetrics) {
      this.lastRequestMetrics = lastRequestMetrics;
    }

    @java.lang.SuppressWarnings("all")
    @lombok.Generated
    public RequestMetrics getLastRequestMetrics() {
      return this.lastRequestMetrics;
    }

    @java.lang.Override
    @java.lang.SuppressWarnings("all")
    @lombok.Generated
    public boolean equals(final java.lang.Object o) {
      if (o == this) return true;
      if (!(o instanceof RequestTelemetry.ClientTelemetryPayload)) return false;
      final RequestTelemetry.ClientTelemetryPayload other = (RequestTelemetry.ClientTelemetryPayload) o;
      if (!other.canEqual((java.lang.Object) this)) return false;
      final java.lang.Object this$lastRequestMetrics = this.getLastRequestMetrics();
      final java.lang.Object other$lastRequestMetrics = other.getLastRequestMetrics();
      if (this$lastRequestMetrics == null ? other$lastRequestMetrics != null : !this$lastRequestMetrics.equals(other$lastRequestMetrics)) return false;
      return true;
    }

    @java.lang.SuppressWarnings("all")
    @lombok.Generated
    protected boolean canEqual(final java.lang.Object other) {
      return other instanceof RequestTelemetry.ClientTelemetryPayload;
    }

    @java.lang.Override
    @java.lang.SuppressWarnings("all")
    @lombok.Generated
    public int hashCode() {
      final int PRIME = 59;
      int result = 1;
      final java.lang.Object $lastRequestMetrics = this.getLastRequestMetrics();
      result = result * PRIME + ($lastRequestMetrics == null ? 43 : $lastRequestMetrics.hashCode());
      return result;
    }

    @java.lang.Override
    @java.lang.SuppressWarnings("all")
    @lombok.Generated
    public java.lang.String toString() {
      return "RequestTelemetry.ClientTelemetryPayload(lastRequestMetrics=" + this.getLastRequestMetrics() + ")";
    }
  }


  private static class RequestMetrics {
    @SerializedName("request_id")
    private final String requestId;
    @SerializedName("request_duration_ms")
    private final long requestDurationMs;

    @java.lang.SuppressWarnings("all")
    @lombok.Generated
    public RequestMetrics(final String requestId, final long requestDurationMs) {
      this.requestId = requestId;
      this.requestDurationMs = requestDurationMs;
    }

    @java.lang.SuppressWarnings("all")
    @lombok.Generated
    public String getRequestId() {
      return this.requestId;
    }

    @java.lang.SuppressWarnings("all")
    @lombok.Generated
    public long getRequestDurationMs() {
      return this.requestDurationMs;
    }

    @java.lang.Override
    @java.lang.SuppressWarnings("all")
    @lombok.Generated
    public boolean equals(final java.lang.Object o) {
      if (o == this) return true;
      if (!(o instanceof RequestTelemetry.RequestMetrics)) return false;
      final RequestTelemetry.RequestMetrics other = (RequestTelemetry.RequestMetrics) o;
      if (!other.canEqual((java.lang.Object) this)) return false;
      final java.lang.Object this$requestId = this.getRequestId();
      final java.lang.Object other$requestId = other.getRequestId();
      if (this$requestId == null ? other$requestId != null : !this$requestId.equals(other$requestId)) return false;
      if (this.getRequestDurationMs() != other.getRequestDurationMs()) return false;
      return true;
    }

    @java.lang.SuppressWarnings("all")
    @lombok.Generated
    protected boolean canEqual(final java.lang.Object other) {
      return other instanceof RequestTelemetry.RequestMetrics;
    }

    @java.lang.Override
    @java.lang.SuppressWarnings("all")
    @lombok.Generated
    public int hashCode() {
      final int PRIME = 59;
      int result = 1;
      final java.lang.Object $requestId = this.getRequestId();
      result = result * PRIME + ($requestId == null ? 43 : $requestId.hashCode());
      final long $requestDurationMs = this.getRequestDurationMs();
      result = result * PRIME + (int) ($requestDurationMs >>> 32 ^ $requestDurationMs);
      return result;
    }

    @java.lang.Override
    @java.lang.SuppressWarnings("all")
    @lombok.Generated
    public java.lang.String toString() {
      return "RequestTelemetry.RequestMetrics(requestId=" + this.getRequestId() + ", requestDurationMs=" + this.getRequestDurationMs() + ")";
    }
  }
}