Java 类com.amazonaws.retry.PredefinedRetryPolicies 实例源码

/**
 * The client execution timer uses interrupts to abort the client but if another thread
 * interrupts the current thread for another reason we don't want to squash the
 * {@link InterruptedException}. We should set the thread's interrupted status and throw the
 * exception back out (we can't throw the actual {@link InterruptedException} because it's
 * checked)
 */
@Test(timeout = TEST_TIMEOUT)
public void interruptCausedBySomethingOtherThanTimer_PropagatesInterruptToCaller() {
    final int socketTimeoutInMillis = 100;
    httpClient = new AmazonHttpClient(new ClientConfiguration().withSocketTimeout(socketTimeoutInMillis)
            .withClientExecutionTimeout(CLIENT_EXECUTION_TIMEOUT)
            .withRetryPolicy(new RetryPolicy(PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION,
                    new FixedTimeBackoffStrategy(CLIENT_EXECUTION_TIMEOUT), 1, false)));

    // We make sure the first connection has failed due to the socket timeout before
    // interrupting so we know that we are sleeping per the backoff strategy. Apache HTTP
    // client doesn't seem to honor interrupts reliably but Thread.sleep does
    interruptCurrentThreadAfterDelay(socketTimeoutInMillis * 2);

    try {
        httpClient.requestExecutionBuilder().request(newGetRequest()).execute();
        fail("Exception expected");
    } catch (AmazonClientException e) {
        assertTrue(Thread.currentThread().isInterrupted());
        assertThat(e.getCause(), instanceOf(InterruptedException.class));
    }
}

@Test(timeout = TEST_TIMEOUT)
public void clientExecutionTimeoutEnabled_WithShorterRequestTimeoutAndRetry_ThrowsClientExecutionTimeoutException()
        throws IOException {
    final int clientExecutionTimeout = 1500;
    final int requestTimeout = 1000;
    final int backoffTime = 300;
    httpClient = new AmazonHttpClient(new ClientConfiguration().withClientExecutionTimeout(clientExecutionTimeout)
            .withRequestTimeout(requestTimeout)
            .withRetryPolicy(new RetryPolicy(PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION,
                    new FixedTimeBackoffStrategy(backoffTime), Integer.MAX_VALUE, false)));

    try {
        httpClient.requestExecutionBuilder().request(newGetRequest()).execute();
        fail("Exception expected");
    } catch (AmazonClientException e) {
        assertThat(e, instanceOf(ClientExecutionTimeoutException.class));
        // Completed tasks means the client execution was aborted by the timer
        assertNumberOfTasksTriggered(httpClient.getClientExecutionTimer(), 1);
        assertNumberOfTasksTriggered(httpClient.getHttpRequestTimer(), 1);
    }
}

private boolean shouldRetryCompleteMultipartUpload(AmazonWebServiceRequest originalRequest,
                                                   AmazonS3Exception exception,
                                                   int retriesAttempted) {

    final RetryPolicy retryPolicy = clientConfiguration.getRetryPolicy();

    if (retryPolicy == null || retryPolicy.getRetryCondition() == null) {
        return false;
    }

    if (retryPolicy == PredefinedRetryPolicies.NO_RETRY_POLICY) {
        return false;
    }

    return completeMultipartUploadRetryCondition.shouldRetry
            (originalRequest, exception, retriesAttempted);
}

@Test
public void testProvide() {
    Env env = new Env().register("DYNAMODB_ENDPOINT", "fakeendpoint");
    ClientConfiguration config = new ClientConfiguration();
    config.setRetryPolicy(PredefinedRetryPolicies.NO_RETRY_POLICY);

    AWSCredentialsProvider credentialsProvider = new StaticCredentialsProvider(
            new BasicAWSCredentials("fake_access_key_id", "fake_secret_access_key"));

    AmazonDynamoDBFactory factory = new AmazonDynamoDBFactory(env, credentialsProvider, config);
    AmazonDynamoDB dynamoDB = factory.provide();

    String message = "";

    try {
        dynamoDB.listTables();  
    } catch (AmazonClientException e) {
        message = e.getMessage();
    }

    assertTrue(message.startsWith("Unable to execute HTTP request: fakeendpoint"));

    factory.dispose(dynamoDB);
}

@Bean
AmazonSNSAsyncClient amazonSNS(ListenerConfig config, AWSCredentialsProvider awsCredentialsProvider) {
  AmazonSNSAsyncClient client = new AmazonSNSAsyncClient(awsCredentialsProvider,
      new ClientConfiguration().withRetryPolicy(PredefinedRetryPolicies.getDefaultRetryPolicy()),
      Executors.newSingleThreadScheduledExecutor());
  client.setRegion(Region.getRegion(Regions.fromName(config.getRegion())));
  return client;
}

private static ClientConfiguration withRetryPolicy(ClientConfiguration config, String tableName, String indexName) {
    RetryPolicy.RetryCondition retryCondition = new PredefinedRetryPolicies.SDKDefaultRetryCondition() {
        @Override
        public boolean shouldRetry(AmazonWebServiceRequest originalRequest,
                                   AmazonClientException exception,
                                   int retriesAttempted)
        {
            if (exception instanceof AmazonServiceException) {
                AmazonServiceException ase = (AmazonServiceException)exception;
                if (RetryUtils.isThrottlingException(ase)) {
                    if ( null != indexName ) {
                        if(LOG.isWarnEnabled())
                            LOG.warn("throttling on table "+tableName+" index "+indexName);
                    } else {
                        if(LOG.isWarnEnabled())
                            LOG.warn("throttling on table "+tableName+" (main index)");
                    }
                }
            }
            return super.shouldRetry(originalRequest, exception, retriesAttempted);
        }
    };
    config.withRetryPolicy(new RetryPolicy(
                               retryCondition,
                               PredefinedRetryPolicies.DYNAMODB_DEFAULT_BACKOFF_STRATEGY,
                               PredefinedRetryPolicies.DYNAMODB_DEFAULT_MAX_ERROR_RETRY,
                               true));
    return config;
}

protected AmazonApiGateway getApiGatewayClient() {
    if (apiGatewayClient != null) {
        return apiGatewayClient;
    }

    RetryPolicy.RetryCondition retryCondition = new RetryPolicy.RetryCondition() {

        @Override
        public boolean shouldRetry(AmazonWebServiceRequest amazonWebServiceRequest, AmazonClientException amazonClientException, int i) {
            if (amazonClientException instanceof TooManyRequestsException) {
                return true;
            }
            return PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION.shouldRetry(amazonWebServiceRequest,
                    amazonClientException, i);
        }
    };

    RetryPolicy retryPolicy = new RetryPolicy(retryCondition,
            PredefinedRetryPolicies.DEFAULT_BACKOFF_STRATEGY,
            10, true);

    ClientConfiguration clientConfig = new ClientConfiguration()
            .withRetryPolicy(retryPolicy);

    apiGatewayClient = new AmazonApiGatewayClient(getAWSCredentialsProvideChain(), clientConfig).withRegion(Region.getRegion(Regions.fromName(deployment.getRegion())));
    return apiGatewayClient;
}

@Provides
protected ApiGateway provideAmazonApiGateway(AWSCredentialsProvider credsProvider,
                                             RetryPolicy.BackoffStrategy backoffStrategy,
                                             @Named("region") String region) {

    final RetryPolicy retrypolicy = new RetryPolicy(PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION, backoffStrategy, 5, true);

    final ClientConfiguration clientConfig = new ClientConfiguration().withUserAgent(USER_AGENT).withRetryPolicy(retrypolicy);

    return new AmazonApiGateway(getEndpoint(region)).with(credsProvider).with(clientConfig).getApiGateway();
}

/**
 * Asserts that the retry policy generated by the factory is configured with the correct values.
 */
@Test
public void assertResultRetryPolicyConfiguredCorrectly()
{
    int expectedMaxErrorRetry = 12345;

    when(configurationHelper.getProperty(any(), eq(Integer.class))).thenReturn(expectedMaxErrorRetry);

    RetryPolicy retryPolicy = retryPolicyFactory.getRetryPolicy();

    assertEquals(PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION, retryPolicy.getRetryCondition());
    assertEquals(backoffStrategy, retryPolicy.getBackoffStrategy());
    assertEquals(expectedMaxErrorRetry, retryPolicy.getMaxErrorRetry());
}

@Test
public void testDeleteDirectoryNoS3VersionsExist()
{
    // Create an S3 file transfer request parameters DTO to access S3 objects.
    S3FileTransferRequestParamsDto s3FileTransferRequestParamsDto = new S3FileTransferRequestParamsDto();
    s3FileTransferRequestParamsDto.setS3BucketName(S3_BUCKET_NAME);
    s3FileTransferRequestParamsDto.setS3KeyPrefix(S3_KEY_PREFIX);

    // Create a retry policy.
    RetryPolicy retryPolicy =
        new RetryPolicy(PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION, PredefinedRetryPolicies.DEFAULT_BACKOFF_STRATEGY, INTEGER_VALUE, true);

    // Create an empty version listing.
    VersionListing versionListing = new VersionListing();

    // Mock the external calls.
    when(retryPolicyFactory.getRetryPolicy()).thenReturn(retryPolicy);
    when(s3Operations.listVersions(any(ListVersionsRequest.class), any(AmazonS3Client.class))).thenReturn(versionListing);

    // Call the method under test.
    s3DaoImpl.deleteDirectory(s3FileTransferRequestParamsDto);

    // Verify the external calls.
    verify(retryPolicyFactory).getRetryPolicy();
    verify(s3Operations).listVersions(any(ListVersionsRequest.class), any(AmazonS3Client.class));
    verifyNoMoreInteractionsHelper();
}

@Provides
protected ApiGateway provideAmazonApiGateway(AWSCredentialsProvider credsProvider,
                                             RetryPolicy.BackoffStrategy backoffStrategy,
                                             @Named("region") String region) {

    final RetryPolicy retrypolicy = new RetryPolicy(PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION, backoffStrategy, 5, true);

    final ClientConfiguration clientConfig = new ClientConfiguration().withUserAgent(USER_AGENT).withRetryPolicy(retrypolicy);

    return new AmazonApiGateway(getEndpoint(region)).with(credsProvider).with(clientConfig).getApiGateway();
}

/**
 * Factory method for DynamoDB's default {@link ClientConfiguration}
 */
public static ClientConfiguration dynamoDefault() {
    return new ClientConfiguration().withRetryPolicy(PredefinedRetryPolicies.DYNAMODB_DEFAULT);
}

/**
 * Configures appender instance and makes it ready for use by the consumers.
 * It validates mandatory parameters and confirms if the configured stream is
 * ready for publishing data yet.
 * 
 * Error details are made available through the fallback handler for this
 * appender
 * 
 * @throws IllegalStateException if we encounter issues configuring this
 *           appender instance
 */
@Override
public void start() {
  if(layout == null) {
    initializationFailed = true;
    addError("Invalid configuration - No layout for appender: " + name);
    return;
  }

  if(streamName == null) {
    initializationFailed = true;
    addError("Invalid configuration - streamName cannot be null for appender: " + name);
    return;
  }

  ClientConfiguration clientConfiguration = new ClientConfiguration();
  clientConfiguration.setMaxErrorRetry(maxRetries);
  clientConfiguration
      .setRetryPolicy(new RetryPolicy(PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION,
                                      PredefinedRetryPolicies.DEFAULT_BACKOFF_STRATEGY, maxRetries, true));
  clientConfiguration.setUserAgent(AppenderConstants.USER_AGENT_STRING);

  BlockingQueue<Runnable> taskBuffer = new LinkedBlockingDeque<Runnable>(bufferSize);
  threadPoolExecutor = new ThreadPoolExecutor(threadCount, threadCount,
                                              AppenderConstants.DEFAULT_THREAD_KEEP_ALIVE_SEC, TimeUnit.SECONDS,
                                              taskBuffer, new BlockFastProducerPolicy());
  threadPoolExecutor.prestartAllCoreThreads();

  this.client = createClient(credentials, clientConfiguration, threadPoolExecutor);

  client.setRegion(findRegion());
  if(!Validator.isBlank(endpoint)) {
    if(!Validator.isBlank(region)) {
      addError("Received configuration for both region as well as Amazon Kinesis endpoint. (" + endpoint
               + ") will be used as endpoint instead of default endpoint for region (" + region + ")");
    }
    client.setEndpoint(endpoint);
  }

  validateStreamName(client, streamName);

  super.start();
}

@Test
public void testGetTemporarySecurityCredentials()
{
    // Create an AWS parameters DTO with proxy settings.
    AwsParamsDto awsParamsDto = new AwsParamsDto();
    awsParamsDto.setHttpProxyHost(HTTP_PROXY_HOST);
    awsParamsDto.setHttpProxyPort(HTTP_PROXY_PORT);

    // Specify the duration, in seconds, of the role session.
    int awsRoleDurationSeconds = INTEGER_VALUE;

    // Create an IAM policy.
    Policy policy = new Policy(STRING_VALUE);

    // Create a retry policy.
    RetryPolicy retryPolicy =
        new RetryPolicy(PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION, PredefinedRetryPolicies.DEFAULT_BACKOFF_STRATEGY, INTEGER_VALUE, true);

    // Create the expected assume role request.
    AssumeRoleRequest assumeRoleRequest = new AssumeRoleRequest().withRoleArn(AWS_ROLE_ARN).withRoleSessionName(SESSION_NAME).withPolicy(policy.toJson())
        .withDurationSeconds(awsRoleDurationSeconds);

    // Create AWS credentials for API authentication.
    Credentials credentials = new Credentials();
    credentials.setAccessKeyId(AWS_ASSUMED_ROLE_ACCESS_KEY);
    credentials.setSecretAccessKey(AWS_ASSUMED_ROLE_SECRET_KEY);
    credentials.setSessionToken(AWS_ASSUMED_ROLE_SESSION_TOKEN);

    // Create an assume role result.
    AssumeRoleResult assumeRoleResult = new AssumeRoleResult();
    assumeRoleResult.setCredentials(credentials);

    // Mock the external calls.
    when(retryPolicyFactory.getRetryPolicy()).thenReturn(retryPolicy);
    when(stsOperations.assumeRole(any(AWSSecurityTokenServiceClient.class), eq(assumeRoleRequest))).thenReturn(assumeRoleResult);

    // Call the method under test.
    Credentials result = stsDaoImpl.getTemporarySecurityCredentials(awsParamsDto, SESSION_NAME, AWS_ROLE_ARN, awsRoleDurationSeconds, policy);

    // Verify the external calls.
    verify(retryPolicyFactory).getRetryPolicy();
    verify(stsOperations).assumeRole(any(AWSSecurityTokenServiceClient.class), eq(assumeRoleRequest));
    verifyNoMoreInteractionsHelper();

    // Validate the returned object.
    assertEquals(credentials, result);
}

@Test
public void testGetTemporarySecurityCredentialsMissingOptionalParameters()
{
    // Create an AWS parameters DTO without proxy settings.
    AwsParamsDto awsParamsDto = new AwsParamsDto();

    // Specify the duration, in seconds, of the role session.
    int awsRoleDurationSeconds = INTEGER_VALUE;

    // Create a retry policy.
    RetryPolicy retryPolicy =
        new RetryPolicy(PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION, PredefinedRetryPolicies.DEFAULT_BACKOFF_STRATEGY, INTEGER_VALUE, true);

    // Create the expected assume role request.
    AssumeRoleRequest assumeRoleRequest =
        new AssumeRoleRequest().withRoleArn(AWS_ROLE_ARN).withRoleSessionName(SESSION_NAME).withDurationSeconds(awsRoleDurationSeconds);

    // Create AWS credentials for API authentication.
    Credentials credentials = new Credentials();
    credentials.setAccessKeyId(AWS_ASSUMED_ROLE_ACCESS_KEY);
    credentials.setSecretAccessKey(AWS_ASSUMED_ROLE_SECRET_KEY);
    credentials.setSessionToken(AWS_ASSUMED_ROLE_SESSION_TOKEN);

    // Create an assume role result.
    AssumeRoleResult assumeRoleResult = new AssumeRoleResult();
    assumeRoleResult.setCredentials(credentials);

    // Mock the external calls.
    when(retryPolicyFactory.getRetryPolicy()).thenReturn(retryPolicy);
    when(stsOperations.assumeRole(any(AWSSecurityTokenServiceClient.class), eq(assumeRoleRequest))).thenReturn(assumeRoleResult);

    // Call the method under test. Please note that we do not specify an IAM policy.
    Credentials result = stsDaoImpl.getTemporarySecurityCredentials(awsParamsDto, SESSION_NAME, AWS_ROLE_ARN, awsRoleDurationSeconds, null);

    // Verify the external calls.
    verify(retryPolicyFactory).getRetryPolicy();
    verify(stsOperations).assumeRole(any(AWSSecurityTokenServiceClient.class), eq(assumeRoleRequest));
    verifyNoMoreInteractionsHelper();

    // Validate the returned object.
    assertEquals(credentials, result);
}

@Test
public void testDeleteDirectoryMultiObjectDeleteException()
{
    // Create an S3 file transfer request parameters DTO to access S3 objects.
    S3FileTransferRequestParamsDto s3FileTransferRequestParamsDto = new S3FileTransferRequestParamsDto();
    s3FileTransferRequestParamsDto.setS3BucketName(S3_BUCKET_NAME);
    s3FileTransferRequestParamsDto.setS3KeyPrefix(S3_KEY_PREFIX);

    // Create a retry policy.
    RetryPolicy retryPolicy =
        new RetryPolicy(PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION, PredefinedRetryPolicies.DEFAULT_BACKOFF_STRATEGY, INTEGER_VALUE, true);

    // Create an S3 version summary.
    S3VersionSummary s3VersionSummary = new S3VersionSummary();
    s3VersionSummary.setKey(S3_KEY);
    s3VersionSummary.setVersionId(S3_VERSION_ID);

    // Create a version listing.
    VersionListing versionListing = new VersionListing();
    versionListing.setVersionSummaries(Arrays.asList(s3VersionSummary));

    // Create a delete error.
    MultiObjectDeleteException.DeleteError deleteError = new MultiObjectDeleteException.DeleteError();
    deleteError.setKey(S3_KEY);
    deleteError.setVersionId(S3_VERSION_ID);
    deleteError.setCode(ERROR_CODE);
    deleteError.setMessage(ERROR_MESSAGE);

    // Create a multi object delete exception.
    MultiObjectDeleteException multiObjectDeleteException = new MultiObjectDeleteException(Arrays.asList(deleteError), new ArrayList<>());

    // Mock the external calls.
    when(retryPolicyFactory.getRetryPolicy()).thenReturn(retryPolicy);
    when(s3Operations.listVersions(any(ListVersionsRequest.class), any(AmazonS3Client.class))).thenReturn(versionListing);
    when(s3Operations.deleteObjects(any(DeleteObjectsRequest.class), any(AmazonS3Client.class))).thenThrow(multiObjectDeleteException);

    // Try to call the method under test.
    try
    {
        s3DaoImpl.deleteDirectory(s3FileTransferRequestParamsDto);
    }
    catch (IllegalStateException e)
    {
        assertEquals(String.format("Failed to delete keys/key versions with prefix \"%s\" from bucket \"%s\". " +
                "Reason: One or more objects could not be deleted (Service: null; Status Code: 0; Error Code: null; Request ID: null; S3 Extended Request ID: null)",
            S3_KEY_PREFIX, S3_BUCKET_NAME), e.getMessage());
    }

    // Verify the external calls.
    verify(retryPolicyFactory, times(2)).getRetryPolicy();
    verify(s3Operations).listVersions(any(ListVersionsRequest.class), any(AmazonS3Client.class));
    verify(s3Operations).deleteObjects(any(DeleteObjectsRequest.class), any(AmazonS3Client.class));
    verifyNoMoreInteractionsHelper();
}

@Test
public void testTagObjects()
{
    // Create an S3 file transfer request parameters DTO to access S3 objects.
    S3FileTransferRequestParamsDto s3FileTransferRequestParamsDto = new S3FileTransferRequestParamsDto();
    s3FileTransferRequestParamsDto.setS3BucketName(S3_BUCKET_NAME);
    s3FileTransferRequestParamsDto.setFiles(Arrays.asList(new File(S3_KEY_PREFIX + "/" + LOCAL_FILE)));

    // Create an S3 file transfer request parameters DTO to tag S3 objects.
    S3FileTransferRequestParamsDto s3ObjectTaggerParamsDto = new S3FileTransferRequestParamsDto();
    s3ObjectTaggerParamsDto.setAwsAccessKeyId(AWS_ASSUMED_ROLE_ACCESS_KEY);
    s3ObjectTaggerParamsDto.setAwsSecretKey(AWS_ASSUMED_ROLE_SECRET_KEY);
    s3ObjectTaggerParamsDto.setSessionToken(AWS_ASSUMED_ROLE_SESSION_TOKEN);

    // Create an S3 object tag.
    Tag tag = new Tag(S3_OBJECT_TAG_KEY, S3_OBJECT_TAG_VALUE);

    // Create a retry policy.
    RetryPolicy retryPolicy =
        new RetryPolicy(PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION, PredefinedRetryPolicies.DEFAULT_BACKOFF_STRATEGY, INTEGER_VALUE, true);

    // Create a get object tagging result.
    GetObjectTaggingResult getObjectTaggingResult = new GetObjectTaggingResult(null);

    // Create a set object tagging result.
    SetObjectTaggingResult setObjectTaggingResult = new SetObjectTaggingResult();

    // Mock the external calls.
    when(retryPolicyFactory.getRetryPolicy()).thenReturn(retryPolicy);
    when(s3Operations.getObjectTagging(any(GetObjectTaggingRequest.class), any(AmazonS3Client.class))).thenReturn(getObjectTaggingResult);
    when(s3Operations.setObjectTagging(any(SetObjectTaggingRequest.class), any(AmazonS3Client.class))).thenReturn(setObjectTaggingResult);

    // Call the method under test.
    s3DaoImpl.tagObjects(s3FileTransferRequestParamsDto, s3ObjectTaggerParamsDto, tag);

    // Verify the external calls.
    verify(retryPolicyFactory, times(2)).getRetryPolicy();
    verify(s3Operations).getObjectTagging(any(GetObjectTaggingRequest.class), any(AmazonS3Client.class));
    verify(s3Operations).setObjectTagging(any(SetObjectTaggingRequest.class), any(AmazonS3Client.class));
    verifyNoMoreInteractionsHelper();
}

public InstrumentedRetryCondition(Registry registry) {
  this(registry, PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION);
}

public InstrumentedBackoffStrategy(Registry registry) {
  this(registry, PredefinedRetryPolicies.DEFAULT_BACKOFF_STRATEGY);
}

/**
  * Configures this appender instance and makes it ready for use by the
  * consumers. It validates mandatory parameters and confirms if the configured
  * stream is ready for publishing data yet.
  * 
  * Error details are made available through the fallback handler for this
  * appender
  * 
  * @throws IllegalStateException
  *           if we encounter issues configuring this appender instance
  */
 @Override
 public void activateOptions() {
   if (streamName == null) {
     initializationFailed = true;
     error("Invalid configuration - streamName cannot be null for appender: " + name);
   }

   if (layout == null) {
     initializationFailed = true;
     error("Invalid configuration - No layout for appender: " + name);
   }

   ClientConfiguration clientConfiguration = new ClientConfiguration();
   clientConfiguration = setProxySettingsFromSystemProperties(clientConfiguration);

   clientConfiguration.setMaxErrorRetry(maxRetries);
   clientConfiguration.setRetryPolicy(new RetryPolicy(PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION,
       PredefinedRetryPolicies.DEFAULT_BACKOFF_STRATEGY, maxRetries, true));
   clientConfiguration.setUserAgent(AppenderConstants.USER_AGENT_STRING);

   BlockingQueue<Runnable> taskBuffer = new LinkedBlockingDeque<Runnable>(bufferSize);
   ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(threadCount, threadCount,
       AppenderConstants.DEFAULT_THREAD_KEEP_ALIVE_SEC, TimeUnit.SECONDS, taskBuffer, new BlockFastProducerPolicy());
   threadPoolExecutor.prestartAllCoreThreads();
   kinesisClient = new AmazonKinesisAsyncClient(new CustomCredentialsProviderChain(), clientConfiguration,
       threadPoolExecutor);

   boolean regionProvided = !Validator.isBlank(region);
   if (!regionProvided) {
     region = AppenderConstants.DEFAULT_REGION;
   }
   if (!Validator.isBlank(endpoint)) {
     if (regionProvided) {
LOGGER
    .warn("Received configuration for both region as well as Amazon Kinesis endpoint. ("
    + endpoint
    + ") will be used as endpoint instead of default endpoint for region ("
    + region + ")");
     }
     kinesisClient.setEndpoint(endpoint,
  AppenderConstants.DEFAULT_SERVICE_NAME, region);
   } else {
     kinesisClient.setRegion(Region.getRegion(Regions.fromName(region)));
   }

   DescribeStreamResult describeResult = null;
   try {
     describeResult = kinesisClient.describeStream(streamName);
     String streamStatus = describeResult.getStreamDescription().getStreamStatus();
     if (!StreamStatus.ACTIVE.name().equals(streamStatus) && !StreamStatus.UPDATING.name().equals(streamStatus)) {
       initializationFailed = true;
       error("Stream " + streamName + " is not ready (in active/updating status) for appender: " + name);
     }
   } catch (ResourceNotFoundException rnfe) {
     initializationFailed = true;
     error("Stream " + streamName + " doesn't exist for appender: " + name, rnfe);
   }

   asyncCallHander = new AsyncPutCallStatsReporter(name);
 }

/**
 * Gets the application's default retry policy. The policy uses PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION, a SimpleExponentialBackoffStrategy, and the
 * maximum number of attempts is dynamically configurable through AWS_MAX_RETRY_ATTEMPT.
 * 
 * @return RetryPolicy
 */
public RetryPolicy getRetryPolicy()
{
    return new RetryPolicy(PredefinedRetryPolicies.DEFAULT_RETRY_CONDITION, backoffStrategy,
        configurationHelper.getProperty(ConfigurationValue.AWS_MAX_RETRY_ATTEMPT, Integer.class), true);
}