[GitHub] [shardingsphere] tristaZero commented on a change in pull request #5327: create RANGE sharding algorithm

[GitBox <gi...@apache.org>]

tristaZero commented on a change in pull request #5327:
URL: https://github.com/apache/shardingsphere/pull/5327#discussion_r415533641



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File path: sharding-core/sharding-core-common/src/main/java/org/apache/shardingsphere/core/strategy/algorithm/sharding/RangeShardingAlgorithm.java
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@@ -0,0 +1,128 @@
+/*
+ * 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.core.strategy.algorithm.sharding;
+
+import com.google.common.base.Preconditions;
+import com.google.common.base.Splitter;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Range;
+import com.google.common.primitives.Longs;
+import org.apache.commons.collections4.CollectionUtils;
+import org.apache.shardingsphere.api.sharding.standard.PreciseShardingValue;
+import org.apache.shardingsphere.api.sharding.standard.RangeShardingValue;
+import org.apache.shardingsphere.api.sharding.standard.StandardShardingAlgorithm;
+
+import java.util.Collection;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Properties;
+import java.util.stream.Collectors;
+
+/**
+ * Range sharding algorithm.
+ * <p>
+ * Range sharding algorithm is similar to the rule of partition table.
+ * User can specify the range by setting the `range.partition.split.value` parameter.
+ * The `range.partition.split.value` parameter is an ordered list of numbers, separated by commas.
+ * </p>
+ * <p>
+ * For example: If the `range.partition.split.value` parameter is set to `1,5,10`,
+ * the parameter will split all values into four intervals——(-∞, 1), [1,5), [5,10), [10, +∞),
+ * which corresponding to partition_0, partition_1, partition_2, partition_3.
+ * The sharding values will be divided into different partition by its value.
+ * </p>
+ */
+public final class RangeShardingAlgorithm implements StandardShardingAlgorithm<Long> {
+
+    private static final String RANGE_PARTITION_SPLIT_VALUE = "range.partition.split.value";
+
+    private Properties properties = new Properties();
+
+    @Override
+    public String doSharding(final Collection<String> availableTargetNames, final PreciseShardingValue<Long> shardingValue) {
+        Preconditions.checkNotNull(properties.get(RANGE_PARTITION_SPLIT_VALUE), "Range sharding algorithm range partition split value cannot be null.");
+        Map<Integer, Range<Long>> partitionRangeMap = getPartitionRangeMap();
+        for (String each : availableTargetNames) {
+            if (each.endsWith(getPartition(partitionRangeMap, shardingValue.getValue()))) {
+                return each;
+            }
+        }
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Collection<String> doSharding(final Collection<String> availableTargetNames, final RangeShardingValue<Long> shardingValue) {
+        Preconditions.checkNotNull(properties.get(RANGE_PARTITION_SPLIT_VALUE), "Range sharding algorithm range partition split value cannot be null.");
+        Map<Integer, Range<Long>> partitionRangeMap = getPartitionRangeMap();

Review comment:
       @SanmuWangZJU Thanks. :)




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