| /* |
| * 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.shardingsphere.sharding.algorithm.sharding.range; |
| |
| import com.google.common.base.Splitter; |
| import com.google.common.collect.Range; |
| import org.apache.shardingsphere.infra.algorithm.core.exception.AlgorithmInitializationException; |
| import org.apache.shardingsphere.infra.exception.core.ShardingSpherePreconditions; |
| |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.Properties; |
| import java.util.stream.Collectors; |
| |
| /** |
| * Boundary based range sharding algorithm. |
| */ |
| public final class BoundaryBasedRangeShardingAlgorithm extends AbstractRangeShardingAlgorithm { |
| |
| private static final String SHARDING_RANGES_KEY = "sharding-ranges"; |
| |
| @Override |
| public Map<Integer, Range<Comparable<?>>> calculatePartitionRange(final Properties props) { |
| ShardingSpherePreconditions.checkContainsKey(props, SHARDING_RANGES_KEY, () -> new AlgorithmInitializationException(this, "Sharding ranges cannot be null.")); |
| List<Long> partitionRanges = Splitter.on(",").trimResults().splitToList(props.getProperty(SHARDING_RANGES_KEY)).stream() |
| .map(this::parseLong).filter(Objects::nonNull).sorted().collect(Collectors.toList()); |
| ShardingSpherePreconditions.checkNotEmpty(partitionRanges, () -> new AlgorithmInitializationException(this, "Sharding ranges can not be empty.")); |
| Map<Integer, Range<Comparable<?>>> result = new HashMap<>(partitionRanges.size() + 1, 1F); |
| for (int i = 0; i < partitionRanges.size(); i++) { |
| Long rangeValue = partitionRanges.get(i); |
| if (0 == i) { |
| result.put(0, Range.lessThan(rangeValue)); |
| } else { |
| Long previousRangeValue = partitionRanges.get(i - 1); |
| result.put(i, Range.closedOpen(previousRangeValue, rangeValue)); |
| } |
| if (i == partitionRanges.size() - 1) { |
| result.put(i + 1, Range.atLeast(rangeValue)); |
| } |
| } |
| return result; |
| } |
| |
| private Long parseLong(final String value) { |
| try { |
| return Long.parseLong(value); |
| } catch (final NumberFormatException ex) { |
| return null; |
| } |
| } |
| |
| @Override |
| public String getType() { |
| return "BOUNDARY_RANGE"; |
| } |
| } |