asyncresttemplate | 易学教程

How can we make asynchronous REST api call in Java?

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问题 I am using Spring RestTemplate and want to make a call to another service that doesn't return any response body. So, I don't want to wait for the response. So, it's just fire and forget, and continue with the remaining code. I am thinking of creating a new Thread to do this but really not sure what's the correct approach. 回答1: The correct approach is to execute the async with a callback (using DeferredResult, like this (assuming we have a class someClass that we want to retrieve from the API:

How can we make asynchronous REST api call in Java?

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How to use Spring WebClient to make multiple calls simultaneously?

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问题 I want to execute 3 calls simultaneously and process the results once they're all done. I know this can be achieved using AsyncRestTemplate as it is mentioned here How to use AsyncRestTemplate to make multiple calls simultaneously? However, AsyncRestTemplate is deprecated in favor of WebClient. I have to use Spring MVC in the project but interested if I can use a WebClient just to execute simultaneous calls. Can someone advise how this should be done properly with WebClient? 回答1: Assuming a

How to use Apache CachingHttpAsyncClient with Spring AsyncRestTemplate?

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问题 Is it possible to use CachingHttpAsyncClient with AsyncRestTemplate ? HttpComponentsAsyncClientHttpRequestFactory expects a CloseableHttpAsyncClient but CachingHttpAsyncClient does not extend it. 回答1: This is known as issue SPR-15664 for versions up to 4.3.9 and 5.0.RC2 - fixed in 4.3.10 and 5.0.RC3. The only way around is is creating a custom AsyncClientHttpRequestFactory implementation that is based on the existing HttpComponentsAsyncClientHttpRequestFactory : // package required for

How to increase timeout AsyncRestTemplate class?

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问题 I have developed some async web services with spring framework and REST, I have consumed it from a client created with spring class AsyncRestTemplate . Class return an object ListenableFuture<ResponseEntity<T>> (with the method getForEntity ), which brings the value returned by the web service (with the method .get():<T> ) . It works fine, however when the web service takes a lot time the method isDone() of ListenableFuture class return a value true , even when the web service has not

Calling Async REST api from spring batch processor

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I wrote a spring batch job that processes List of Lists. Reader returns List of List. Processor works on each ListItem and returns processed List. Writer writes stuff to DB and sftp from List of List. I have a use case where I call Async REST api from spring batch processor. On ListenableFuture response I implemented LitenableFutureCallback to handle success and failure, which works as expected, but before the async call returns something, ItemProcessor dosen't wait for call backs from async api and returns object(List) to writer. I am not sure how to implement and handle async calls from

Calling Async REST api from spring batch processor

阅读更多关于 Calling Async REST api from spring batch processor

问题 I wrote a spring batch job that processes List of Lists. Reader returns List of List. Processor works on each ListItem and returns processed List. Writer writes stuff to DB and sftp from List of List. I have a use case where I call Async REST api from spring batch processor. On ListenableFuture response I implemented LitenableFutureCallback to handle success and failure, which works as expected, but before the async call returns something, ItemProcessor dosen't wait for call backs from async