maksaska commented on code in PR #311: URL: https://github.com/apache/ignite-extensions/pull/311#discussion_r2247303016
########## modules/cdc-ext/src/main/java/org/apache/ignite/cdc/postgresql/IgniteToPostgreSqlCdcApplier.java: ########## @@ -0,0 +1,670 @@ +/* + * 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.ignite.cdc.postgresql; + +import java.math.BigDecimal; +import java.nio.ByteBuffer; +import java.nio.ByteOrder; +import java.sql.Connection; +import java.sql.PreparedStatement; +import java.sql.SQLException; +import java.sql.Statement; +import java.sql.Types; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Iterator; +import java.util.Map; +import java.util.Set; +import java.util.UUID; +import javax.sql.DataSource; +import org.apache.ignite.IgniteException; +import org.apache.ignite.IgniteLogger; +import org.apache.ignite.binary.BinaryObject; +import org.apache.ignite.cache.CacheEntryVersion; +import org.apache.ignite.cache.QueryEntity; +import org.apache.ignite.cdc.CdcCacheEvent; +import org.apache.ignite.cdc.CdcEvent; +import org.apache.ignite.internal.util.typedef.F; + +import static org.apache.ignite.internal.processors.cache.GridCacheUtils.UNDEFINED_CACHE_ID; + +/** */ +public class IgniteToPostgreSqlCdcApplier { + /** */ + public static final String DFLT_SQL_TYPE = "OTHER"; + + /** */ + public static final Map<String, String> JAVA_TO_SQL_TYPES; + + /** */ + public static final Set<String> SQL_TYPES_WITH_PRECISION_ONLY; + + /** */ + public static final Set<String> SQL_TYPES_WITH_PRECISION_AND_SCALE; + + static { + Map<String, String> javaToSqlTypes = new HashMap<>(); + + javaToSqlTypes.put("java.lang.String", "VARCHAR"); + javaToSqlTypes.put("java.lang.Integer", "INT"); + javaToSqlTypes.put("int", "INT"); + javaToSqlTypes.put("java.lang.Long", "BIGINT"); + javaToSqlTypes.put("long", "BIGINT"); + javaToSqlTypes.put("java.lang.Boolean", "BOOLEAN"); + javaToSqlTypes.put("boolean", "BOOLEAN"); + javaToSqlTypes.put("java.lang.Double", "DOUBLE PRECISION"); + javaToSqlTypes.put("double", "DOUBLE PRECISION"); + javaToSqlTypes.put("java.lang.Float", "REAL"); + javaToSqlTypes.put("float", "REAL"); + javaToSqlTypes.put("java.math.BigDecimal", "DECIMAL"); + javaToSqlTypes.put("java.lang.Short", "SMALLINT"); + javaToSqlTypes.put("short", "SMALLINT"); + javaToSqlTypes.put("java.lang.Byte", "SMALLINT"); + javaToSqlTypes.put("byte", "SMALLINT"); + javaToSqlTypes.put("java.util.UUID", "UUID"); + javaToSqlTypes.put("[B", "BYTEA"); + javaToSqlTypes.put("java.lang.Object", "OTHER"); + + JAVA_TO_SQL_TYPES = Collections.unmodifiableMap(javaToSqlTypes); + + Set<String> sqlTypesWithPrecisionOnly = new HashSet<>(); + + sqlTypesWithPrecisionOnly.add("VARCHAR"); + sqlTypesWithPrecisionOnly.add("DOUBLE PRECISION"); + + SQL_TYPES_WITH_PRECISION_ONLY = Collections.unmodifiableSet(sqlTypesWithPrecisionOnly); + + Set<String> sqlTypesWithPrecisionAndScale = new HashSet<>(); + + sqlTypesWithPrecisionAndScale.add("DECIMAL"); + sqlTypesWithPrecisionAndScale.add("REAL"); + + SQL_TYPES_WITH_PRECISION_AND_SCALE = Collections.unmodifiableSet(sqlTypesWithPrecisionAndScale); + } + + /** */ + private static final boolean DFLT_AUTO_COMMIT = false; + + /** */ + private final DataSource dataSrc; + + /** */ + private final long batchSize; + + /** */ + private final IgniteLogger log; + + /** */ + private final Map<Integer, String> cacheIdToUpsertQry = new HashMap<>(); + + /** */ + private final Map<Integer, String> cacheIdToDeleteQry = new HashMap<>(); + + /** */ + private final Map<Integer, Set<String>> cacheIdToPrimaryKeys = new HashMap<>(); + + /** */ + private final Map<Integer, Set<String>> cacheIdToFields = new HashMap<>(); + + /** */ + private final Set<Object> curKeys = new HashSet<>(); + + /** + * @param dataSrc {@link DataSource} - connection pool to PostgreSql + * @param batchSize the number of CDC events to include in a single batch + * @param log the {@link IgniteLogger} instance used for logging CDC processing events + */ + public IgniteToPostgreSqlCdcApplier( + DataSource dataSrc, + long batchSize, + IgniteLogger log + ) { + this.dataSrc = dataSrc; + this.batchSize = batchSize; + this.log = log; + } + + /** + * @param evts an {@link Iterator} of {@link CdcEvent} objects to be applied + * @return the total number of events successfully batched and executed + */ + public long applyEvents(Iterator<CdcEvent> evts) { + try (Connection conn = dataSrc.getConnection()) { + conn.setAutoCommit(DFLT_AUTO_COMMIT); + + long res = applyEvents(conn, evts); + + conn.commit(); + + return res; + } + catch (Throwable e) { + log.error(e.getMessage(), e); + + throw new IgniteException("CDC failure", e); + } + } + + /** + * @param conn connection to PostgreSql + * @param evts an {@link Iterator} of {@link CdcEvent} objects to be applied + * @return the total number of events successfully batched and executed + */ + private long applyEvents(Connection conn, Iterator<CdcEvent> evts) throws SQLException { + long evtsApplied = 0; + + int currCacheId = UNDEFINED_CACHE_ID; + boolean prevOpIsDelete = false; + + PreparedStatement curPrepStmt = null; + CdcEvent evt; + + while (evts.hasNext()) { + evt = evts.next(); + + if (log.isDebugEnabled()) + log.debug("Event received [evt=" + evt + ']'); + + if (currCacheId != evt.cacheId() || prevOpIsDelete ^ (evt.value() == null)) { + if (curPrepStmt != null) + evtsApplied += executeBatch(conn, curPrepStmt); + + currCacheId = evt.cacheId(); + prevOpIsDelete = evt.value() == null; + + curPrepStmt = prepareStatement(conn, evt); + } + + if (curKeys.size() >= batchSize || curKeys.contains(evt.key())) + evtsApplied += executeBatch(conn, curPrepStmt); + + addEvent(curPrepStmt, evt); + } + + if (!curKeys.isEmpty()) + evtsApplied += executeBatch(conn, curPrepStmt); + + return evtsApplied; + } + + /** + * @param conn connection to PostgreSql + * @param curPrepStmt {@link PreparedStatement} + * @return the total number of batches successfully executed. One CdcEvent - one batch. + */ + private int executeBatch(Connection conn, PreparedStatement curPrepStmt) { + try { + curKeys.clear(); + + if (log.isDebugEnabled()) + log.debug("Applying batch " + curPrepStmt.toString()); + + if (!curPrepStmt.isClosed()) { + int batchSize = curPrepStmt.executeBatch().length; + + // It's better to use autoCommit = false and call commit() manually for improved performance and + // clearer transaction boundaries + conn.commit(); + + return batchSize; + } + + throw new IgniteException("Tried to execute on closed prepared statement!"); + } + catch (SQLException e) { + log.error(e.getMessage(), e); + + throw new IgniteException(e); + } + } + + /** + * @param conn connection to PostgreSql + * @param evt {@link CdcEvent} + * @return relevant {@link PreparedStatement} + */ + private PreparedStatement prepareStatement(Connection conn, CdcEvent evt) { + String sqlQry; + + if (evt.value() == null) + sqlQry = cacheIdToDeleteQry.get(evt.cacheId()); + else + sqlQry = cacheIdToUpsertQry.get(evt.cacheId()); + + if (sqlQry == null) + throw new IgniteException("No SQL query is found for cacheId=" + evt.cacheId()); + + if (log.isDebugEnabled()) + log.debug("Statement updated [cacheId=" + evt.cacheId() + ", sqlQry=" + sqlQry + ']'); + + try { + return conn.prepareStatement(sqlQry); + } + catch (SQLException e) { + log.error(e.getMessage(), e); + + throw new IgniteException(e); + } + } + + /** + * @param curPrepStmt current {@link PreparedStatement} + * @param evt {@link CdcEvent} + */ + private void addEvent(PreparedStatement curPrepStmt, CdcEvent evt) { + try { + Iterator<String> itFields = evt.value() == null ? + cacheIdToPrimaryKeys.get(evt.cacheId()).iterator() : + cacheIdToFields.get(evt.cacheId()).iterator(); + + String field; + + BinaryObject keyObj = (evt.key() instanceof BinaryObject) ? (BinaryObject)evt.key() : null; + BinaryObject valObj = (evt.value() instanceof BinaryObject) ? (BinaryObject)evt.value() : null; + + int idx = 1; + Object obj; + + while (itFields.hasNext()) { + field = itFields.next(); + + if (cacheIdToPrimaryKeys.get(evt.cacheId()).contains(field)) + obj = keyObj != null ? keyObj.field(field) : evt.key(); + else + obj = valObj != null ? valObj.field(field) : evt.value(); + + addObject(curPrepStmt, idx, obj); + + idx++; + } + + if (evt.value() != null) + curPrepStmt.setBytes(idx, encodeVersion(evt.version())); + + curKeys.add(evt.key()); + + curPrepStmt.addBatch(); + } + catch (Throwable e) { + log.error(e.getMessage(), e); + + throw new IgniteException(e); + } + } + + /** + * Sets a value in the PreparedStatement at the given index using the appropriate setter + * based on the runtime type of the object. + * @param curPrepStmt {@link PreparedStatement} + * @param idx value index in {@link PreparedStatement} + * @param obj value + */ + private void addObject(PreparedStatement curPrepStmt, int idx, Object obj) throws SQLException { + if (obj == null) { + curPrepStmt.setObject(idx, null); + + return; + } + + if (obj instanceof String) + curPrepStmt.setString(idx, (String)obj); + else if (obj instanceof Integer) + curPrepStmt.setInt(idx, (Integer)obj); + else if (obj instanceof Long) + curPrepStmt.setLong(idx, (Long)obj); + else if (obj instanceof Short) + curPrepStmt.setShort(idx, (Short)obj); + else if (obj instanceof Byte) + curPrepStmt.setByte(idx, (Byte)obj); + else if (obj instanceof Boolean) + curPrepStmt.setBoolean(idx, (Boolean)obj); + else if (obj instanceof Float) + curPrepStmt.setFloat(idx, (Float)obj); + else if (obj instanceof Double) + curPrepStmt.setDouble(idx, (Double)obj); + else if (obj instanceof BigDecimal) + curPrepStmt.setBigDecimal(idx, (BigDecimal)obj); + else if (obj instanceof UUID) + curPrepStmt.setObject(idx, obj, Types.OTHER); // PostgreSQL expects UUID as OTHER + else if (obj instanceof byte[]) + curPrepStmt.setBytes(idx, (byte[])obj); + else + curPrepStmt.setObject(idx, obj); + } + + /** + * @param evts an {@link Iterator} of {@link CdcCacheEvent} objects to apply + * @param createTables tables creation flag. If true - attempt to create tables will be made. + * @return Number of applied events. + */ + public long applyCacheEvents(Iterator<CdcCacheEvent> evts, boolean createTables) { + CdcCacheEvent evt; + QueryEntity entity; + + long cnt = 0; + + while (evts.hasNext()) { + evt = evts.next(); + + if (evt.queryEntities().size() != 1) + throw new IgniteException("There should be exactly 1 QueryEntity for cacheId: " + evt.cacheId()); + + entity = evt.queryEntities().iterator().next(); + + if (createTables) + createTableIfNotExists(entity); + + cacheIdToUpsertQry.put(evt.cacheId(), getUpsertSqlQry(entity)); + + cacheIdToDeleteQry.put(evt.cacheId(), getDeleteSqlQry(entity)); + + cacheIdToPrimaryKeys.put(evt.cacheId(), getPrimaryKeys(entity)); + + cacheIdToFields.put(evt.cacheId(), entity.getFields().keySet()); + + if (log.isInfoEnabled()) + log.info("Cache table created [tableName=" + entity.getTableName() + Review Comment: Done! -- This is an automated message from the Apache Git Service. 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