Issue 871 in google-api-java-client: Support for App Engine asynchronous URL Fetch

[google-api-...@googlecode.com]

Status: New
Owner: wonder...@google.com
Labels: Type-Defect Priority-Medium

New issue 871 by jlo...@google.com: Support for App Engine asynchronous URL
Fetch
http://code.google.com/p/google-api-java-client/issues/detail?id=871

Java environment: App Engine

This is a feature request to provide support for App Engine's async URL
Fetch which is documented here:

https://developers.google.com/appengine/docs/java/javadoc/com/google/appengine/api/urlfetch/URLFetchService#fetchAsync(com.google.appengine.api.urlfetch.HTTPRequest)

Support needs to be added to the App Engine client to return a Future:

https://code.google.com/p/google-http-java-client/source/browse/google-http-client-appengine/src/main/java/com/google/api/client/extensions/appengine/http/UrlFetchRequest.java

In addition, the generated libraries need to support handling Future
objects.

For example, when using the BigQuery client library:

https://developers.google.com/api-client-library/java/apis/bigquery/v2

You would need to be able to do a streaming insert as documented here, in a
way which returned a Future:

https://developers.google.com/bigquery/streaming-data-into-bigquery

The benefit is that you may not have to pay additional frontend instance
hours while waiting for a streaming insert to return, if your App Engine
code could be doing other work.

Note that there is an HTTPRequest.executeAsync() method available in beta,
though it has not been added to the App Engine client:

https://code.google.com/p/google-http-java-client/source/browse/google-http-client/src/main/java/com/google/api/client/http/HttpRequest.java#1071







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Updates:
Status: WontFix
Labels: -Type-Defect -Priority-Medium Type-Enhancement Priority-Low

Comment #1 on issue 871 by wonder...@google.com: Support for App Engine
asynchronous URL Fetch
https://code.google.com/p/google-api-java-client/issues/detail?id=871

We don't have a plan for adding async support to this library at the
moment. I am intending to close this as a low priority feature request,
unless there's a strong need in the future.

HttpRequest.executeAsync() is a semi-async implementation, i.e., you have
to poll the status of the future, instead of being called back. In terms of
App Engine, there isn't a special App Engine client in any way. There's an
HttpTransport that's AppEngine specific, but the client you use on
AppEngine extends the same AbstractGoogleJsonClient, which has access to
HttpRequest.executeAsync(). A small trick is to call
AbstractGoogleClientRequest.buildHttpRequest().executeAsync().

[google-api-...@googlecode.com]

Comment #2 on issue 871 by al...@streak.com: Support for App Engine

asynchronous URL Fetch
https://code.google.com/p/google-api-java-client/issues/detail?id=871

#1 - will calling
AbstractGoogleClientRequest.buildHttpRequest().executeAsync() while using
the Appengine Transport use appengine's underlying urlfetch.getAsync() or
does AbstractGoogleClientRequest.buildHttpRequest().executeAsync() just
start a new thread?

[google-api-...@googlecode.com]

Comment #3 on issue 871 by wonder...@google.com: Support for App Engine

asynchronous URL Fetch
https://code.google.com/p/google-api-java-client/issues/detail?id=871

It just starts a new thread and returns a Future.

[google-api-...@googlecode.com]

Updates:
Status: Moved

Comment #4 on issue 871 by wonder...@google.com: Support for App Engine

asynchronous URL Fetch
https://code.google.com/p/google-api-java-client/issues/detail?id=871

Moved to: Issue google-http-java-client:276