dcapwell commented on code in PR #6:
URL: https://github.com/apache/cassandra-accord/pull/6#discussion_r938262631
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accord-core/src/main/java/accord/primitives/Deps.java:
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@@ -0,0 +1,978 @@
+package accord.primitives;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.function.BiConsumer;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.function.Predicate;
+
+import com.google.common.base.Preconditions;
+
+import accord.api.Key;
+import accord.local.Command;
+import accord.local.CommandStore;
+import accord.utils.InlineHeap;
+import accord.utils.SortedArrays;
+
+import static accord.utils.SortedArrays.remap;
+import static accord.utils.SortedArrays.remapper;
+
+// TODO (now): switch to RoutingKey
+public class Deps implements Iterable<Map.Entry<Key, TxnId>>
+{
+ private static final TxnId[] NO_TXNIDS = new TxnId[0];
+ private static final int[] NO_INTS = new int[0];
+ public static final Deps NONE = new Deps(Keys.EMPTY, NO_TXNIDS, NO_INTS);
+
+ public static class Builder
+ {
+ final Keys keys;
+ final Map<TxnId, Integer> txnIdLookup = new HashMap<>(); // TODO:
primitive map
+ TxnId[] txnIds = new TxnId[4];
+ final int[][] keysToTxnId;
+ final int[] keysToTxnIdCounts;
+
+ public Builder(Keys keys)
+ {
+ this.keys = keys;
+ this.keysToTxnId = new int[keys.size()][4];
+ this.keysToTxnIdCounts = new int[keys.size()];
+ }
+
+ public boolean isEmpty()
+ {
+ return Arrays.stream(keysToTxnIdCounts).allMatch(i -> i == 0);
Review Comment:
maybe just `return txnIdLookup.isEmpty()`? I point out in a different
comment the code currently allows `!txnIdLookup.isEmpty()` but
`keysToTxnIdCounts` is empty, so guess if we want to keep that behavior then
this logic is more correct to me.
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