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Make ConnectorBucketNodeMap a top level class
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78 changes: 78 additions & 0 deletions
78
presto-spi/src/main/java/com/facebook/presto/spi/connector/ConnectorBucketNodeMap.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| /* | ||
| * Licensed 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 com.facebook.presto.spi.connector; | ||
|
|
||
| import com.facebook.presto.spi.Node; | ||
|
|
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| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.Optional; | ||
|
|
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| import static java.lang.String.format; | ||
| import static java.util.Collections.unmodifiableMap; | ||
| import static java.util.Objects.requireNonNull; | ||
|
|
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| public final class ConnectorBucketNodeMap | ||
| { | ||
| private final int bucketCount; | ||
| private final Optional<Map<Integer, Node>> bucketToNode; | ||
|
|
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| public static ConnectorBucketNodeMap createBucketNodeMap(int bucketCount) | ||
| { | ||
| return new ConnectorBucketNodeMap(bucketCount, Optional.empty()); | ||
| } | ||
|
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| public static ConnectorBucketNodeMap createBucketNodeMap(Map<Integer, Node> bucketToNode) | ||
| { | ||
| requireNonNull(bucketToNode, "bucketToNode is null"); | ||
| int maxBucket = bucketToNode.keySet().stream() | ||
| .mapToInt(Integer::intValue) | ||
| .peek(bucket -> { | ||
| if (bucket < 0) { | ||
| throw new IllegalArgumentException("Bucket number must be positive: " + bucket); | ||
| } | ||
| }) | ||
| .max() | ||
| .orElseThrow(() -> new IllegalArgumentException("bucketToNode is empty")); | ||
| return new ConnectorBucketNodeMap(maxBucket + 1, Optional.of(bucketToNode)); | ||
| } | ||
|
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| private ConnectorBucketNodeMap(int bucketCount, Optional<Map<Integer, Node>> bucketToNode) | ||
| { | ||
| if (bucketCount <= 0) { | ||
| throw new IllegalArgumentException("bucketCount must be positive"); | ||
| } | ||
| if (bucketToNode.isPresent() && bucketToNode.get().size() != bucketCount) { | ||
| throw new IllegalArgumentException(format("Mismatched bucket count in bucketToNode (%s) and bucketCount (%s)", bucketToNode.get().size(), bucketCount)); | ||
| } | ||
| this.bucketCount = bucketCount; | ||
| this.bucketToNode = requireNonNull(bucketToNode, "bucketToNode is null") | ||
| .map(mapping -> unmodifiableMap(new HashMap<>(mapping))); | ||
| } | ||
|
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| public int getBucketCount() | ||
| { | ||
| return bucketCount; | ||
| } | ||
|
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| public boolean hasFixedMapping() | ||
| { | ||
| return bucketToNode.isPresent(); | ||
| } | ||
|
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| public Map<Integer, Node> getFixedMapping() | ||
| { | ||
| return bucketToNode.orElseThrow(() -> new IllegalArgumentException("No fixed bucket to node mapping")); | ||
| } | ||
| } |
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