| Interface | Description | 
|---|---|
| AsyncHandler<REQUEST extends AmazonWebServiceRequest,RESULT> | Callback interface for notification on web service requests executed with the
 asynchronous clients in the AWS SDK for Java. | 
| IRequestHandler2 | Interface for  RequestHandler2. | 
| RequestHandler | Deprecated by  RequestHandler2. | 
| Class | Description | 
|---|---|
| AbstractRequestHandler | Deprecated by  RequestHandler2. | 
| CredentialsRequestHandler | Deprecated Use of this class to retrieve the credentials is unsafe in
 multithreading scenarios. | 
| HandlerAfterAttemptContext | Contextual data for the RequestHandler2 afterAttempt callback
 Under certain conditions (redirects), both response and exception may be null | 
| HandlerAfterAttemptContext.HandlerAfterAttemptContextBuilder | Builder class for HandlerAfterAttemptContext | 
| HandlerBeforeAttemptContext | Contextual data for the RequestHandler2 beforeAttempt callback | 
| HandlerBeforeAttemptContext.HandlerBeforeAttemptContextBuilder | Builder class for HandlerBeforeAttemptContext | 
| HandlerChainFactory | Factory for creating request/response handler chains. | 
| HandlerContextKey<T> | A type safe key used for setting and retrieving context in a  Requestobject. | 
| RequestHandler2 | Interface for addition request handling in clients. | 
| RequestHandler2AdaptorTest | |
| StackedRequestHandler | Composite  RequestHandler2to execute a chain ofRequestHandler2implementations
 in stack order. | 
| StackedRequestHandlerTest | |
| StackedRequestHandlerTest.MultipleRequestHandlers | Tests a  StackedRequestHandlerwith multipleRequestHandler2added. | 
| StackedRequestHandlerTest.NoRequestHandlers | Tests a  StackedRequestHandlerwith noRequestHandler2's added. | 
| StackedRequestHandlerTest.SingleRequestHandler | Tests a  StackedRequestHandlerwith a singleRequestHandler2added. | 
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