samples: exit early if no messages are returned #989
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product-auto-label bot added api: pubsub 
anguillanneuf changed the title 
anguillanneuf changed the title anguillanneuf changed the title 
kurtisvg suggested changes Feb 3, 2022
| // Exit the program if the pull response is empty. | ||
| if (pullResponse.getReceivedMessagesList().isEmpty()) { | ||
| System.out.println("No message was pulled. Exiting."); | ||
| System.exit(0); |
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System.exit probably isn't what you want here (it may crash the tests) - don't you just want to return?
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You're right. Updated to return.
| // Exit the program if the pull response is empty. | ||
| if (pullResponse.getReceivedMessagesList().isEmpty()) { | ||
| System.out.println("No message was pulled. Exiting."); | ||
| System.exit(0); |
| // Use pullCallable().futureCall to asynchronously perform this operation. | ||
| PullResponse pullResponse = subscriber.pullCallable().call(pullRequest); | ||
| | ||
| // Exit the program if the pull response is empty. |
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This comment tells me what you are doing (but so does the code). Can we update it to tell me why we are doing?
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That's a good point. Updated.
kurtisvg approved these changes Feb 3, 2022
rajanya-google pushed a commit to rajanya-google/java-pubsub that referenced this pull request Feb 16, 2022
* samples: exit early if no messages are pulled * address kurtis's comments * update comment
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Fixes #189
The current samples will fail with
io.grpc.StatusRuntimeException: INVALID_ARGUMENT: You have not specified an ack ID in the requestif no messages are returned. Updating them to handle this case.This does not affect the existing tests for the samples.
I also noticed something that should not have been published with one of the samples in the first place - my project and topic ID. Apologies.