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FeedHandlerJava.java
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FeedHandlerJava.java
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package example7.java;
import io.vavr.control.Try;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import static java.util.stream.Collectors.toList;
import static io.vavr.API.$;
import static io.vavr.API.Match;
import static io.vavr.API.*; // $, Case, Match
import static io.vavr.Predicates.*; // instanceOf
public class FeedHandlerJava {
private Repository repository;
public FeedHandlerJava(Repository repository) {
this.repository = repository;
}
List<Doc> handle(List<Doc> changes,
Function<Doc, Try<Resource>> creator) {
return changes.stream()
.filter(doc -> isImportant(doc))
.map(doc -> {
return creator.apply(doc)
.recover(x -> Match(x).of(
Case($(instanceOf(DuplicateResourceException.class)), t -> handleDuplicate(doc)),
Case($(instanceOf(SpecialException.class)), t -> handleSpecial(t))
)).map(resource -> {
return setToProcessed(doc, resource);
}).getOrElseGet(e -> {
return setToFailed(doc, e);
});
}).collect(toList());
}
private Resource handleDuplicate(Doc alreadyProcessed) {
// find earlier saved, existing resource and return that one
return repository.findById(alreadyProcessed.getApiId());
}
private static Resource handleSpecial(SpecialException e) {
// handle special situation
return new Resource();
}
private static boolean isImportant(Doc doc) {
return doc.getType().equals("important");
}
private static Doc setToProcessed(Doc doc, Resource resource) {
return Doc.copyWith(doc, resource, "processed");
}
private static Doc setToFailed(Doc doc, Throwable e) {
return Doc.copyWith(doc, "failed", e);
}
}