aweisberg commented on code in PR #26:
URL: https://github.com/apache/cassandra-accord/pull/26#discussion_r1093723225
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accord-core/src/main/java/accord/utils/ReducingRangeMap.java:
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@@ -0,0 +1,131 @@
+package accord.utils;
+
+import accord.api.RoutingKey;
+import accord.primitives.*;
+import com.google.common.annotations.VisibleForTesting;
+
+import java.util.function.BiFunction;
+import java.util.function.Predicate;
+
+import static accord.utils.SortedArrays.Search.FAST;
+
+public class ReducingRangeMap<V> extends ReducingIntervalMap<RoutingKey, V>
+{
+ final RoutingKeys endKeys;
+
+ public ReducingRangeMap(V value)
+ {
+ super(value);
+ this.endKeys = RoutingKeys.EMPTY;
+ }
+
+ ReducingRangeMap(boolean inclusiveEnds, RoutingKey[] ends, V[] values)
+ {
+ super(inclusiveEnds, ends, values);
+ this.endKeys = RoutingKeys.ofSortedUnique(ends);
+ }
+
+ public <V2> V2 foldl(Routables<?, ?> routables, BiFunction<V, V2, V2>
fold, V2 initialValue, Predicate<V2> terminate)
+ {
+ switch (routables.domain())
+ {
+ default: throw new AssertionError();
+ case Key: return foldl((AbstractKeys<?, ?>) routables, fold,
initialValue, terminate);
+ case Range: return Routables.foldl(endKeys, (AbstractRanges<?>)
routables, (f, vs, routingKey, v, index) -> f.apply(vs[index], v), fold,
values, initialValue, terminate);
+ }
+ }
+
+ public <V2> V2 foldl(AbstractKeys<?, ?> keys, BiFunction<V, V2, V2>
reduce, V2 accumulator, Predicate<V2> terminate)
+ {
+ int i = 0, j = 0;
+ while (j < keys.size())
+ {
+ i = endKeys.findNext(i, keys.get(j), FAST);
+ if (i < 0) i = -1 - i;
+ else if (inclusiveEnds) ++i;
+
+ accumulator = reduce.apply(values[i], accumulator);
+ if (i == endKeys.size() || terminate.test(accumulator))
+ return accumulator;
+
+ j = keys.findNext(j + 1, endKeys.get(i), FAST);
+ if (j < 0) j = -1 - j;
+ else if (inclusiveEnds) ++j;
+ }
+ return accumulator;
+ }
+
+ /**
+ * returns a copy of this LinearRangeMap limited to the ranges supplied,
with all other ranges reporting Ballot.none()
Review Comment:
It's not a ballot anymore
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