August 2019
Intermediate to advanced
256 pages
6h 43m
English
book
Hands-On Enterprise Java Microservices with Eclipse MicroProfile
by Cesar Saavedra, Heiko W. Rupp, Jeff Mesnil, Pavol Loffay, Antoine Sabot-Durand, Scott Stark
Content preview from Hands-On Enterprise Java Microservices with Eclipse MicroProfile
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The @Fallback policy
The @Fallback annotation can only be applied on a method; annotating a class will give an unexpected result:
@Retry(maxRetries = 2)@Fallback(StringFallbackHandler.class)public String shouldFallback() { ...}
The fallback method is called after the number of retries is reached. In the previous example, the method will be retried twice in case of an error, and then the fallback will be used to invoke another piece of code—in this case, the following StringFallbackHandler class:
import javax.enterprise.context.ApplicationScoped;import org.eclipse.microprofile.config.inject.ConfigProperty;import org.eclipse.microprofile.faulttolerance.ExecutionContext;import org.eclipse.microprofile.faulttolerance.FallbackHandler;@ApplicationScoped ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.