com.evanlennick.retry4j.CallExecutor Java Examples

@Override
public void sendBatch(TransportBuffer buffer) throws TransportException {

  Buffer internalBuffer = ((TcpTransportBuffer) buffer).getInternalBuffer();

  Callable<Boolean> write = () -> {
    try {
      sink.write(internalBuffer, internalBuffer.size());
      return true;
    } catch (IOException ex) {
      throw new TransportException("Error while sending in tcp transport", ex);
    }
  };

  try {
    new CallExecutor(retryConfig).execute(write);
  } catch (RetriesExhaustedException | UnexpectedException ue) {
    throw new TransportException(ue);
  }

}
 

protected final <T> T retry(Callable<T> callable) {
    final Callable<T> wrapper = () -> {
        try {
            return callable.call();
        } catch (final Exception e) {
            System.out.println("retry[] exception: " + e.getMessage());
            e.printStackTrace();
            throw e;
        }
    };
    final RetryConfig config = new RetryConfigBuilder()
            .retryOnAnyException()
            .withMaxNumberOfTries(30)
            .withDelayBetweenTries(10, ChronoUnit.SECONDS)
            .withFixedBackoff()
            .build();
    final CallResults<Object> results = new CallExecutor(config).execute(wrapper);
    return (T) results.getResult();
}
 

protected final <T> T retry(Callable<T> callable) {
    final Callable<T> wrapper = () -> {
        try {
            return callable.call();
        } catch (final Exception e) {
            System.out.println("retry[] exception: " + e.getMessage());
            e.printStackTrace();
            throw e;
        }
    };
    final RetryConfig config = new RetryConfigBuilder()
            .retryOnAnyException()
            .withMaxNumberOfTries(30)
            .withDelayBetweenTries(10, ChronoUnit.SECONDS)
            .withFixedBackoff()
            .build();
    final CallResults<Object> results = new CallExecutor(config).execute(wrapper);
    return (T) results.getResult();
}
 

protected final <T> T retry(Callable<T> callable) {
    final Callable<T> wrapper = () -> {
        try {
            return callable.call();
        } catch (final Exception e) {
            System.out.println("retry[] exception: " + e.getMessage());
            e.printStackTrace();
            throw e;
        }
    };
    final RetryConfig config = new RetryConfigBuilder()
            .retryOnAnyException()
            .withMaxNumberOfTries(30)
            .withDelayBetweenTries(10, ChronoUnit.SECONDS)
            .withFixedBackoff()
            .build();
    final CallResults<Object> results = new CallExecutor(config).execute(wrapper);
    return (T) results.getResult();
}
 

@Override
public InternalEvent next() {
  updateCursor();

  /*
   * Wrap reading next row in retry logic. This is because there is intermittent socket timeouts
   * when reading from S3 that cause the function to hang/fail.
   */
  Callable<String> callable = () -> {
    return this.lineIterator.next();
  };

  String nextRow;
  try {
    CallResults<Object> results = new CallExecutor(this.config).execute(callable);
    nextRow = (String) results.getResult();
  } catch (RetriesExhaustedException ree) {
    throw new RuntimeException(ree.getCallResults().getLastExceptionThatCausedRetry());
  } catch (UnexpectedException ue) {
    throw ue;
  }

  /*
   * Construct the internal event
   */
  return new S3InternalEvent(nextRow, this.context, this.arrivalTime,
      currentS3Entity.getObject().getKey(), currentS3Entity.getBucket().getName(),
      currentS3Entity.getObject().getVersionId());
}
 

@Test
public void verifySimpleExponentialProfile() {
    Callable<Boolean> callable = () -> true;

    RetryConfig retryConfig = retryConfigBuilder
            .exponentialBackoff5Tries5Sec()
            .build();

    CallExecutor callExecutor = new CallExecutorBuilder().config(retryConfig).build();
    Status results = callExecutor.execute(callable);
    assertThat(results.wasSuccessful());
}
 

@Test
public void verifySimpleFibonacciProfile() {
    Callable<Boolean> callable = () -> true;

    RetryConfig retryConfig = retryConfigBuilder
            .fiboBackoff7Tries5Sec()
            .build();

    CallExecutor callExecutor = new CallExecutorBuilder().config(retryConfig).build();
    Status results = callExecutor.execute(callable);
    assertThat(results.wasSuccessful());
}
 

@Test
public void verifySimpleRandomExponentialProfile() {
    Callable<Boolean> callable = () -> true;

    RetryConfig retryConfig = retryConfigBuilder
            .randomExpBackoff10Tries60Sec()
            .build();

    CallExecutor callExecutor = new CallExecutorBuilder().config(retryConfig).build();
    Status results = callExecutor.execute(callable);
    assertThat(results.wasSuccessful());
}
 

@Test
public void verifySimpleFixedProfile() {
    Callable<Boolean> callable = () -> true;

    RetryConfig retryConfig = retryConfigBuilder
            .fixedBackoff5Tries10Sec()
            .build();

    CallExecutor callExecutor = new CallExecutorBuilder().config(retryConfig).build();
    Status results = callExecutor.execute(callable);
    assertThat(results.wasSuccessful());
}
 

public void sendBatch(byte[] raw) throws TransportException {
  /*
   * Wrap the call with retry logic to avoid intermittent ES issues.
   */
  Callable<HttpResponse> callable = () -> {
    HttpResponse resp;
    String responseString = null;
    HttpPost httpPost = new HttpPost(this.url);

    /*
     * Do the call, read response, release connection so it is available for use again, and
     * finally check the response.
     */
    try {
      if (this.useGzip) {
        resp = sendBatchCompressed(httpPost, raw);
      } else {
        resp = sendBatchUncompressed(httpPost, raw);
      }

      try {
        responseString = EntityUtils.toString(resp.getEntity());
      } catch (ParseException | IOException e) {
        throw new TransportException(
            "http transport call failed because " + resp.getStatusLine().getReasonPhrase());
      }
    } finally {
      /*
       * Always release connection otherwise it blocks future requests.
       */
      httpPost.releaseConnection();
    }

    checkResponse(resp, responseString);
    return resp;
  };

  RetryConfig config = new RetryConfigBuilder()
      .retryOnSpecificExceptions(TransportException.class).withMaxNumberOfTries(this.retries + 1)
      .withDelayBetweenTries(this.retryDelayMs, ChronoUnit.MILLIS).withExponentialBackoff()
      .build();

  try {
    new CallExecutor(config).execute(callable);
  } catch (RetriesExhaustedException ree) {
    logger.warn("transport failed after " + ree.getCallResults().getTotalTries() + " tries.");
    throw new TransportException(ree.getCallResults().getLastExceptionThatCausedRetry());
  } catch (UnexpectedException ue) {
    throw new TransportException(ue);
  }
}