| /* |
| * 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.seatunnel.connectors.seatunnel.jdbc.internal.split; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkState; |
| |
| import java.io.Serializable; |
| |
| /** |
| * This query parameters generator is an helper class to parameterize from/to queries on a numeric |
| * column. The generated array of from/to values will be equally sized to fetchSize (apart from the |
| * last one), ranging from minVal up to maxVal. |
| * |
| * <p>For example, if there's a table <CODE>BOOKS</CODE> with a numeric PK <CODE>id</CODE>, using a |
| * query like: |
| * |
| * <PRE> |
| * SELECT * FROM BOOKS WHERE id BETWEEN ? AND ? |
| * </PRE> |
| * |
| * <p>You can take advantage of this class to automatically generate the parameters of the BETWEEN |
| * clause, based on the passed constructor parameters. |
| */ |
| public class JdbcNumericBetweenParametersProvider implements JdbcParameterValuesProvider { |
| |
| private final long minVal; |
| private final long maxVal; |
| |
| private long batchSize; |
| private int batchNum; |
| |
| /** |
| * NumericBetweenParametersProviderJdbc constructor. |
| * |
| * @param minVal the lower bound of the produced "from" values |
| * @param maxVal the upper bound of the produced "to" values |
| */ |
| public JdbcNumericBetweenParametersProvider(long minVal, long maxVal) { |
| checkArgument(minVal <= maxVal, "minVal must not be larger than maxVal"); |
| this.minVal = minVal; |
| this.maxVal = maxVal; |
| } |
| |
| /** |
| * NumericBetweenParametersProviderJdbc constructor. |
| * |
| * @param fetchSize the max distance between the produced from/to pairs |
| * @param minVal the lower bound of the produced "from" values |
| * @param maxVal the upper bound of the produced "to" values |
| */ |
| public JdbcNumericBetweenParametersProvider(long fetchSize, long minVal, long maxVal) { |
| checkArgument(minVal <= maxVal, "minVal must not be larger than maxVal"); |
| this.minVal = minVal; |
| this.maxVal = maxVal; |
| ofBatchSize(fetchSize); |
| } |
| |
| public JdbcNumericBetweenParametersProvider ofBatchSize(long batchSize) { |
| checkArgument(batchSize > 0, "Batch size must be positive"); |
| |
| long maxElemCount = (maxVal - minVal) + 1; |
| if (batchSize > maxElemCount) { |
| batchSize = maxElemCount; |
| } |
| this.batchSize = batchSize; |
| this.batchNum = new Double(Math.ceil((double) maxElemCount / batchSize)).intValue(); |
| return this; |
| } |
| |
| public JdbcNumericBetweenParametersProvider ofBatchNum(int batchNum) { |
| checkArgument(batchNum > 0, "Batch number must be positive"); |
| |
| long maxElemCount = (maxVal - minVal) + 1; |
| if (batchNum > maxElemCount) { |
| batchNum = (int) maxElemCount; |
| } |
| this.batchNum = batchNum; |
| this.batchSize = new Double(Math.ceil((double) maxElemCount / batchNum)).longValue(); |
| return this; |
| } |
| |
| @Override |
| public Serializable[][] getParameterValues() { |
| checkState( |
| batchSize > 0, |
| "Batch size and batch number must be positive. Have you called `ofBatchSize` or `ofBatchNum`?"); |
| |
| long maxElemCount = (maxVal - minVal) + 1; |
| long bigBatchNum = maxElemCount - (batchSize - 1) * batchNum; |
| |
| Serializable[][] parameters = new Serializable[batchNum][2]; |
| long start = minVal; |
| for (int i = 0; i < batchNum; i++) { |
| long end = start + batchSize - 1 - (i >= bigBatchNum ? 1 : 0); |
| parameters[i] = new Long[] {start, end}; |
| start = end + 1; |
| } |
| return parameters; |
| } |
| } |