aweisberg commented on code in PR #2339: URL: https://github.com/apache/cassandra/pull/2339#discussion_r1205895861
########## src/java/org/apache/cassandra/service/accord/CommandsForRanges.java: ########## @@ -0,0 +1,505 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.cassandra.service.accord; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.HashSet; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.Set; +import java.util.TreeMap; +import java.util.function.BiFunction; +import java.util.function.Function; +import javax.annotation.Nullable; + +import com.google.common.collect.AbstractIterator; +import com.google.common.collect.ImmutableSet; +import com.google.common.collect.ImmutableSortedMap; + +import accord.api.Key; +import accord.api.RoutingKey; +import accord.impl.CommandTimeseries; +import accord.impl.CommandTimeseriesHolder; +import accord.local.Command; +import accord.local.PreLoadContext; +import accord.local.SafeCommand; +import accord.local.SafeCommandStore; +import accord.local.SaveStatus; +import accord.primitives.AbstractKeys; +import accord.primitives.PartialDeps; +import accord.primitives.Range; +import accord.primitives.Ranges; +import accord.primitives.Routable; +import accord.primitives.RoutableKey; +import accord.primitives.Seekable; +import accord.primitives.Seekables; +import accord.primitives.Timestamp; +import accord.primitives.TxnId; +import accord.utils.Invariants; +import org.apache.cassandra.service.accord.api.AccordRoutingKey; +import org.apache.cassandra.service.accord.api.AccordRoutingKey.TokenKey; +import org.apache.cassandra.service.accord.api.PartitionKey; +import org.apache.cassandra.utils.Interval; +import org.apache.cassandra.utils.IntervalTree; + +public class CommandsForRanges +{ + public enum TxnType + { + UNKNOWN, LOCAL, REMOTE; + + private boolean isSafeToMix(TxnType other) + { + if (this == UNKNOWN || other == UNKNOWN) return true; + return this == other; + } + } + + public static final class RangeCommandSummary + { + public final TxnId txnId; + public final Ranges ranges; + public final SaveStatus status; + public final @Nullable Timestamp executeAt; + public final List<TxnId> deps; + + RangeCommandSummary(TxnId txnId, Ranges ranges, SaveStatus status, @Nullable Timestamp executeAt, List<TxnId> deps) + { + this.txnId = txnId; + this.ranges = ranges; + this.status = status; + this.executeAt = executeAt; + this.deps = deps; + } + + public boolean equalsDeep(RangeCommandSummary other) + { + return Objects.equals(txnId, other.txnId) + && Objects.equals(ranges, other.ranges) + && Objects.equals(status, other.status) + && Objects.equals(executeAt, other.executeAt) + && Objects.equals(deps, other.deps); + } + + @Override + public boolean equals(Object o) + { + if (this == o) return true; + if (o == null || getClass() != o.getClass()) return false; + RangeCommandSummary that = (RangeCommandSummary) o; + return txnId.equals(that.txnId); + } + + @Override + public int hashCode() + { + return Objects.hash(txnId); + } + + @Override + public String toString() + { + return "RangeCommandSummary{" + + "txnId=" + txnId + + ", status=" + status + + ", ranges=" + ranges + + '}'; + } + + public RangeCommandSummary withRanges(Ranges ranges, BiFunction<? super Ranges, ? super Ranges, ? extends Ranges> remappingFunction) + { + return new RangeCommandSummary(txnId, remappingFunction.apply(this.ranges, ranges), status, executeAt, deps); + } + } + + private enum RangeCommandSummaryLoader implements CommandTimeseries.CommandLoader<RangeCommandSummary> + { + INSTANCE; + + @Override + public RangeCommandSummary saveForCFK(Command command) + { + //TODO split write from read? + throw new UnsupportedOperationException(); + } + + @Override + public TxnId txnId(RangeCommandSummary data) + { + return data.txnId; + } + + @Override + public Timestamp executeAt(RangeCommandSummary data) + { + return data.executeAt; + } + + @Override + public SaveStatus saveStatus(RangeCommandSummary data) + { + return data.status; + } + + @Override + public List<TxnId> depsIds(RangeCommandSummary data) + { + return data.deps; + } + } + + public static abstract class AbstractBuilder<T extends AbstractBuilder<T>> + { + protected final Set<TxnId> localTxns = new HashSet<>(); + protected final TreeMap<TxnId, RangeCommandSummary> txnToRange = new TreeMap<>(); + protected final IntervalTree.Builder<RoutableKey, RangeCommandSummary, Interval<RoutableKey, RangeCommandSummary>> rangeToTxn = new IntervalTree.Builder<>(); + + public TxnType type(TxnId txnId) + { + if (!txnToRange.containsKey(txnId)) return TxnType.UNKNOWN; + return localTxns.contains(txnId) ? TxnType.LOCAL : TxnType.REMOTE; + } + + public T put(TxnId txnId, Ranges ranges, SaveStatus status, Timestamp execteAt, List<TxnId> dependsOn) + { + remove(txnId); + RangeCommandSummary summary = new RangeCommandSummary(txnId, ranges, status, execteAt, dependsOn); + localTxns.add(txnId); + txnToRange.put(txnId, summary); + addRanges(summary); + return (T) this; + } + + private void addRanges(RangeCommandSummary summary) + { + for (Range range : summary.ranges) + { + rangeToTxn.add(Interval.create(normalize(range.start(), range.startInclusive(), true), + normalize(range.end(), range.endInclusive(), false), + summary)); + } + } + + public T putAll(CommandsForRanges other) + { + for (TxnId id : other.localCommands) + { + TxnType thisType = type(id); + TxnType otherType = other.type(id); + Invariants.checkArgument(thisType.isSafeToMix(otherType), "Attempted to add %s; expected %s but was %s", id, thisType, otherType); + } + localTxns.addAll(other.localCommands); + txnToRange.putAll(other.commandsToRanges); + // If "put" was called before for a txn present in "other", to respect the "put" semantics that update must + // be removed from "rangeToTxn" (as it got removed from "txnToRange"). + // The expected common case is that this method is called on an empty builder, so the removeIf is off an + // empty list (aka no-op) + rangeToTxn.removeIf(data -> other.commandsToRanges.containsKey(data.txnId)); + rangeToTxn.addAll(other.rangesToCommands); + return (T) this; + } + + public T mergeRemote(TxnId txnId, Ranges ranges, BiFunction<? super Ranges, ? super Ranges, ? extends Ranges> remappingFunction) + { + Invariants.checkArgument(!localTxns.contains(txnId), "Attempted to merge remote txn %s, but this is a local txn", txnId); + // accord.impl.CommandTimeseries.mapReduce does the check on status and deps type, and NotWitnessed should match the semantics hard coded in InMemorySafeStore... + // in that store, the remote history is only ever included when minStauts == null and deps == ANY... but mapReduce sees accord.local.Status.KnownDeps.hasProposedOrDecidedDeps == false + // as a mis-match, so will be excluded... since NotWitnessed will return false it will only be included IFF deps = ANY. + // When it comes to the minStatus check, the current usage is "null", "Committed", "Accepted"... so NotWitnessed will only be included in the null case; + // the only subtle difference is if minStatus = NotWitnessed, this API will include these but InMemoryStore won't + RangeCommandSummary oldValue = txnToRange.get(txnId); + RangeCommandSummary newValue = oldValue == null ? + new RangeCommandSummary(txnId, ranges, SaveStatus.NotWitnessed, null, Collections.emptyList()) + : oldValue.withRanges(ranges, remappingFunction); + if (newValue == null) Review Comment: Can `newValue` actually be null here? `oldValue.withRanges` doesn't appear to return null. -- This is an automated message from the Apache Git Service. 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