com.amazonaws.handlers

Interface IRequestHandler2

All Known Implementing Classes:

AcceptJsonRequestHandler, CopyDBClusterSnapshotPresignHandler, CopyDBSnapshotPresignHandler, CreateDBClusterPresignHandler, CreateDBInstanceReadReplicaPresignHandler, CredentialsRequestHandler, PredictEndpointHandler, RandomIdHandler, RequestHandler2, StackedRequestHandler, SwitchToPostHandler

public interface IRequestHandler2

Interface for RequestHandler2. Do not use this outside the core SDK. We can and will add methods to this interface in the future. Extend RequestHandler2 to implement a custom request handler.

Method Summary

Modifier and Type	Method and Description
void	afterAttempt(HandlerAfterAttemptContext context) Runs any additional processing logic on a request after each individual attempt.
void	afterError(Request<?> request, Response<?> response, Exception e) Runs any additional processing logic on a request after it has failed.
void	afterResponse(Request<?> request, Response<?> response) Runs any additional processing logic on the specified request (after is has been executed by the client runtime).
void	beforeAttempt(HandlerBeforeAttemptContext context) Runs any additional processing logic on a request before each individual attempt is made.
AmazonWebServiceRequest	beforeExecution(AmazonWebServiceRequest request) Runs any additional processing logic on the specified request object as soon as the request is provided to the service client.
AmazonWebServiceRequest	beforeMarshalling(AmazonWebServiceRequest request) Runs any additional processing logic on the specified request object before it is marshaled into an HTTP request.
void	beforeRequest(Request<?> request) Runs any additional processing logic on the specified request (before it is executed by the client runtime).
HttpResponse	beforeUnmarshalling(Request<?> request, HttpResponse httpResponse) Runs any additional processing logic on the specified response before it's unmarshalled.

Method Detail

beforeExecution

AmazonWebServiceRequest beforeExecution(AmazonWebServiceRequest request)

Runs any additional processing logic on the specified request object as soon as the request is provided to the service client.

This request handler is excluded from the client execution time metrics and is run on the application's thread, even for asynchronous requests.

Warning: Modifications to this message will leak out to the user, who might reuse the request object without realizing that it was modified as part of sending it the first time. For this reason, we recommend that you only modify the request in the beforeRequest(Request) method. If you require data that is not available in that method, you should create a AmazonWebServiceRequest.clone() of the request (which performs a deep copy of the handler context map), add any context data you require in the beforeRequest(Request) method using AmazonWebServiceRequest.addHandlerContext(HandlerContextKey, Object), and return your cloned message from this method. You can then extract that data for use in the request using HandlerContextAware.getHandlerContext(HandlerContextKey).

Parameters:

request - the request passed in by the user

Returns:

the (possibly different) request to execute

beforeMarshalling

AmazonWebServiceRequest beforeMarshalling(AmazonWebServiceRequest request)

Runs any additional processing logic on the specified request object before it is marshaled into an HTTP request.

Warning: Modifications to this message will leak out to the user, who might reuse the request object without realizing that it was modified as part of sending it the first time. For this reason, we recommend that you only modify the request in the beforeRequest(Request) method. If you require data that is not available in that method, you should create a AmazonWebServiceRequest.clone() of the request (which performs a deep copy of the handler context map), add any context data you require in the beforeRequest(Request) method using AmazonWebServiceRequest.addHandlerContext(HandlerContextKey, Object), and return your cloned message from this method. You can then extract that data for use in the request using HandlerContextAware.getHandlerContext(HandlerContextKey).

Parameters:

request - the request passed in by the user

Returns:

the (possibly different) request to marshal

beforeRequest

void beforeRequest(Request<?> request)

Runs any additional processing logic on the specified request (before it is executed by the client runtime).

Parameters:

request - The low level request being processed.

beforeAttempt

void beforeAttempt(HandlerBeforeAttemptContext context)

Runs any additional processing logic on a request before each individual attempt is made.

Parameters:

context - container for callback-related data; includes the request

beforeUnmarshalling

HttpResponse beforeUnmarshalling(Request<?> request,
                                 HttpResponse httpResponse)

Runs any additional processing logic on the specified response before it's unmarshalled. This callback is only invoked on successful responses that will be unmarshalled into an appropriate modeled class and not for unsuccessful responses that will be unmarshalled into a subclass of AmazonServiceException

Parameters:

request - The low level request being processed.

httpResponse - The Raw HTTP response before being unmarshalled

Returns:

HttpResponse to replace the actual response. May be a mutated version of the original or a completely new HttpResponse object

afterAttempt

void afterAttempt(HandlerAfterAttemptContext context)

Runs any additional processing logic on a request after each individual attempt. Callback is invoked whether or not the attempt resulted in a successful response or an error. This callback is invoked within a finally block and so any exceptions it generates will "replace" the current exception, if one is outstanding.

Parameters:

context - container for the request as well as all possible results of the attempt

afterResponse

void afterResponse(Request<?> request,
                   Response<?> response)

Runs any additional processing logic on the specified request (after is has been executed by the client runtime).

Parameters:

request - The low level request being processed.

response - The response generated from the specified request.

afterError

void afterError(Request<?> request,
                Response<?> response,
                Exception e)

Runs any additional processing logic on a request after it has failed. This callback is invoked from a catch block. If it generates an exception, the original AmazonClientException will be lost.

Parameters:

request - The request that generated an error.

response - the response or null if the failure occurred before the response is made available

e - The error that resulted from executing the request.