feat: add lazy initializer #423
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Codecov Report
@@ Coverage Diff @@
## master #423 +/- ##
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Coverage 82.16% 82.17%
- Complexity 2455 2460 +5
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Files 136 138 +2
Lines 13589 13605 +16
Branches 1307 1309 +2
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+ Hits 11166 11180 +14
- Misses 1895 1896 +1
- Partials 528 529 +1
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| * Generic {@link AbstractLazyInitializer} for any heavy-weight object that might throw an exception | ||
| * during initialization. The underlying object is initialized at most once. | ||
| */ | ||
| public abstract class AbstractLazyInitializer<T> { |
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Could we use composition instead of inheritance (pass in the initialiser function instead of overriding it)?
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That would be possible, but as we have to support Java 7, that would mean that we would have to use com.google.cloud.base.Function in the public interface. I think that it is more idiomatic to use inheritance than composition for Java 7 (once we drop Java 7 support, I would agree that using composition would be a lot nicer in this case).
Adds a
LazyInitializerforSpannerinstances that can be used in environments where it is desirable to initialize one instance once, and reuse this for multiple purposes, such as for example Google Cloud Functions.This change would allow us to simplify the Google Cloud Functions Java sample.
Towards GoogleCloudPlatform/java-docs-samples#2862.