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由 Arjen Poutsma 提交于
Added AsyncRestTemplate, the asynchronous counterpart to the RestTemplate that was introduced in Spring 3. All methods on the AsyncRestTemplate are similar to those found on the synchronous RestTemplatem, except that they return Future wrappers instead of concrete results. To enable this, this commit introduces the AsyncClientHttpRequest and AsyncClientHttpRequestFactory, similar to the ClientHttpRequest and ClientHttpRequestFactory, except that ClientHttpRequest returns a Future<ClientHttpResponse> for the execute method. Two implementations of these interfaces are provided, one based on the HttpURLConnection incombination with a Spring AsyncTaskExecutor and one based on Apache HttpComponents HttpAsyncClient. Issue: SPR-8804
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