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Support prioritization of DockerClientProviderStrategies #362

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merged 8 commits into from
Jun 21, 2017

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bsideup
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@bsideup bsideup commented Jun 10, 2017

To improve the start-up time, we can adjust the priorities of strategies based on the environment.

Please review "isApplicable" very carefully to avoid some breaking changes :)

@bsideup bsideup requested review from rnorth and kiview June 10, 2017 16:25
@bsideup bsideup added this to the 1.3.1 milestone Jun 10, 2017
return true;
}

protected int getPriority() {
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Maybe worth mentioning in a comment how the priority is used (i.e. highest to lowest) for avoidance of doubt.

throw new IllegalStateException("Could not find a valid Docker environment. Please see logs and check configuration");
return strategies.stream()
.filter(DockerClientProviderStrategy::isApplicable)
.sorted(Comparator.comparing(DockerClientProviderStrategy::getPriority).reversed())
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My only slight concern with determining the order at run time is that it means there's no one place you can look in the code to see the sequence. Now people will have to look at the implementations of all the strategies to figure out what order they'll run in.

Having said that, this does allow us to do dynamic prioritisation. So, e.g. as I mentioned on Slack, caching last known good config somewhere. Is that the kind of thing you had in mind too?

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Ignore that - the PR title gives it away 🤦‍♂️

👍 !

# Conflicts:
#	CHANGELOG.md
#	core/src/main/java/org/testcontainers/utility/TestcontainersConfiguration.java
@rnorth rnorth merged commit 81952c4 into master Jun 21, 2017
@rnorth rnorth deleted the strategy_priorities branch June 21, 2017 20:32
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2 participants