/** * Builds a new {@link EventSchema} from builder values. * * @return new EventSchema */ public EventSchema build() { return new EventSchema(this); } }
@Override public PreparedStatement createDomainEventTable(Connection connection, EventSchema schema) throws SQLException { String sql = "CREATE TABLE IF NOT EXISTS " + schema.domainEventTable() + " (\n" + schema.globalIndexColumn() + " " + idColumnType() + " NOT NULL,\n" + schema.aggregateIdentifierColumn() + " VARCHAR(255) NOT NULL,\n" + schema.sequenceNumberColumn() + " BIGINT NOT NULL,\n" + schema.typeColumn() + " VARCHAR(255),\n" + schema.eventIdentifierColumn() + " VARCHAR(255) NOT NULL,\n" + schema.metaDataColumn() + " " + payloadType() + ",\n" + schema.payloadColumn() + " " + payloadType() + " NOT NULL,\n" + schema.payloadRevisionColumn() + " VARCHAR(255),\n" + schema.payloadTypeColumn() + " VARCHAR(255) NOT NULL,\n" + schema.timestampColumn() + " VARCHAR(255) NOT NULL,\n" + "PRIMARY KEY (" + schema.globalIndexColumn() + "),\n" + "UNIQUE (" + schema.aggregateIdentifierColumn() + ", " + schema.sequenceNumberColumn() + "),\n" + "UNIQUE (" + schema.eventIdentifierColumn() + ")\n" + ")"; return connection.prepareStatement(sql); }
/** * Creates a statement to delete all snapshots of the aggregate with given {@code aggregateIdentifier}. * * @param connection The connection to the database. * @param aggregateIdentifier The identifier of the aggregate whose snapshots to delete. * @return A {@link PreparedStatement} that deletes all the aggregate's snapshots when executed. * * @throws SQLException when an exception occurs while creating the prepared statement. */ protected PreparedStatement deleteSnapshots(Connection connection, String aggregateIdentifier, long sequenceNumber) throws SQLException { PreparedStatement preparedStatement = connection.prepareStatement( "DELETE FROM " + schema.snapshotTable() + " WHERE " + schema.aggregateIdentifierColumn() + " = ? " + "AND " + schema.sequenceNumberColumn() + " < ?" ); preparedStatement.setString(1, aggregateIdentifier); preparedStatement.setLong(2, sequenceNumber); return preparedStatement; }
/** * Returns a comma separated list of domain event column names to select from an event or snapshot entry. * * @return comma separated domain event column names. */ protected String domainEventFields() { return String.join(", ", schema.eventIdentifierColumn(), schema.timestampColumn(), schema.payloadTypeColumn(), schema.payloadRevisionColumn(), schema.payloadColumn(), schema.metaDataColumn(), schema.typeColumn(), schema.aggregateIdentifierColumn(), schema.sequenceNumberColumn()); }
/** * Creates a statement to read domain event entries for an aggregate with given identifier starting with the first * entry having a sequence number that is equal or larger than the given {@code firstSequenceNumber}. * * @param connection The connection to the database. * @param identifier The identifier of the aggregate. * @param firstSequenceNumber The expected sequence number of the first returned entry. * @param batchSize The number of items to include in the batch * @return A {@link PreparedStatement} that returns event entries for the given query when executed. * * @throws SQLException when an exception occurs while creating the prepared statement. */ protected PreparedStatement readEventData(Connection connection, String identifier, long firstSequenceNumber, int batchSize) throws SQLException { Transaction tx = transactionManager.startTransaction(); try { final String sql = "SELECT " + trackedEventFields() + " FROM " + schema.domainEventTable() + " WHERE " + schema.aggregateIdentifierColumn() + " = ? AND " + schema.sequenceNumberColumn() + " >= ? AND " + schema.sequenceNumberColumn() + " < ? ORDER BY " + schema.sequenceNumberColumn() + " ASC"; PreparedStatement preparedStatement = connection.prepareStatement(sql); preparedStatement.setString(1, identifier); preparedStatement.setLong(2, firstSequenceNumber); preparedStatement.setLong(3, firstSequenceNumber + batchSize); return preparedStatement; } finally { tx.commit(); } }
@Override public TrackingToken createTailToken() { String sql = "SELECT min(" + schema.globalIndexColumn() + ") - 1 FROM " + schema.domainEventTable(); Long index = transactionManager.fetchInTransaction( () -> executeQuery(getConnection(), connection -> connection.prepareStatement(sql), resultSet -> nextAndExtract(resultSet, 1, Long.class), e -> new EventStoreException("Failed to get tail token", e))); return Optional.ofNullable(index) .map(seq -> GapAwareTrackingToken.newInstance(seq, Collections.emptySet())) .orElse(null); }
PreparedStatement statement = conn.prepareStatement(format("SELECT %s, %s FROM %s WHERE %s >= ? AND %s <= ?", schema.globalIndexColumn(), schema.timestampColumn(), schema.domainEventTable(), schema.globalIndexColumn(), schema.globalIndexColumn())); statement.setLong(1, gaps.first()); statement.setLong(2, gaps.last() + 1L); while (resultSet.next()) { try { long sequenceNumber = resultSet.getLong(schema.globalIndexColumn()); Instant timestamp = DateTimeUtils.parseInstant(readTimeStamp(resultSet, schema.timestampColumn()).toString()); if (gaps.contains(sequenceNumber) || timestamp.isAfter(gapTimeoutFrame())) {
@Test public void testCreateDomainEventTable() throws Exception { // test passes if no exception is thrown testSubject.createDomainEventTable(connection, eventSchema) .execute(); connection.prepareStatement("SELECT * FROM " + eventSchema.domainEventTable()) .execute(); connection.prepareStatement("DROP TABLE " + eventSchema.domainEventTable()) .execute(); connection.prepareStatement("DROP SEQUENCE " + eventSchema.domainEventTable() + "_seq") .execute(); }
@Test public void testCreateSnapshotEventTable() throws Exception { // test passes if no exception is thrown testSubject.createSnapshotEventTable(connection, eventSchema) .execute(); connection.prepareStatement("SELECT * FROM " + eventSchema.snapshotTable()) .execute(); connection.prepareStatement("DROP TABLE " + eventSchema.snapshotTable()) .execute(); } }
/** * Returns a comma separated list of tracked domain event column names to select from an event entry. * * @return comma separated tracked domain event column names. */ protected String trackedEventFields() { return schema.globalIndexColumn() + ", " + domainEventFields(); }
/** * Initializes the default Event Schema */ public EventSchema() { this(builder()); }
@Override public TrackingToken createHeadToken() { String sql = "SELECT max(" + schema.globalIndexColumn() + ") FROM " + schema.domainEventTable(); Long index = transactionManager.fetchInTransaction( () -> executeQuery(getConnection(), connection -> connection.prepareStatement(sql), resultSet -> nextAndExtract(resultSet, 1, Long.class), e -> new EventStoreException("Failed to get head token", e))); return Optional.ofNullable(index) .map(seq -> GapAwareTrackingToken.newInstance(seq, Collections.emptySet())) .orElse(null); }
@Override public Optional<Long> lastSequenceNumberFor(String aggregateIdentifier) { String sql = "SELECT max(" + schema.sequenceNumberColumn() + ") FROM " + schema.domainEventTable() + " WHERE " + schema.aggregateIdentifierColumn() + " = ?"; return Optional.ofNullable(transactionManager.fetchInTransaction( () -> executeQuery(getConnection(), connection -> { PreparedStatement stmt = connection.prepareStatement(sql); stmt.setString(1, aggregateIdentifier); return stmt; }, resultSet -> nextAndExtract(resultSet, 1, Long.class), e -> new EventStoreException( format("Failed to read events for aggregate [%s]", aggregateIdentifier), e ) ))); }
@Override public TrackingToken createTokenAt(Instant dateTime) { String sql = "SELECT min(" + schema.globalIndexColumn() + ") - 1 FROM " + schema.domainEventTable() + " WHERE " + schema.timestampColumn() + " >= ?"; Long index = transactionManager.fetchInTransaction( () -> executeQuery(getConnection(), connection -> { PreparedStatement stmt = connection.prepareStatement(sql); stmt.setString(1, formatInstant(dateTime)); return stmt; }, resultSet -> nextAndExtract(resultSet, 1, Long.class), e -> new EventStoreException(format("Failed to get token at [%s]", dateTime), e))); if (index == null) { return null; } return GapAwareTrackingToken.newInstance(index, Collections.emptySet()); }
/** * Returns a comma separated list of tracked domain event column names to select from an event entry. * * @return comma separated tracked domain event column names. */ protected String trackedEventFields() { return schema.globalIndexColumn() + ", " + domainEventFields(); }
/** * Initializes the default Event Schema */ public EventSchema() { this(builder()); }
@Override public PreparedStatement createSnapshotEventTable(Connection connection, EventSchema schema) throws SQLException { String sql = "CREATE TABLE " + schema.snapshotTable() + " (\n" + schema.aggregateIdentifierColumn() + " VARCHAR(255) NOT NULL,\n" + schema.sequenceNumberColumn() + " NUMBER(19) NOT NULL,\n" + schema.typeColumn() + " VARCHAR(255) NOT NULL,\n" + schema.eventIdentifierColumn() + " VARCHAR(255) NOT NULL,\n" + schema.metaDataColumn() + " " + payloadType() + ",\n" + schema.payloadColumn() + " " + payloadType() + " NOT NULL,\n" + schema.payloadRevisionColumn() + " VARCHAR(255),\n" + schema.payloadTypeColumn() + " VARCHAR(255) NOT NULL,\n" + schema.timestampColumn() + " VARCHAR(255) NOT NULL,\n" + "PRIMARY KEY (" + schema.aggregateIdentifierColumn() + ", " + schema.sequenceNumberColumn() + "),\n" + "UNIQUE (" + schema.eventIdentifierColumn() + ")\n" + ")"; return connection.prepareStatement(sql); }
() -> format("Token [%s] is of the wrong type", lastToken)); GapAwareTrackingToken previousToken = (GapAwareTrackingToken) lastToken; String sql = "SELECT " + trackedEventFields() + " FROM " + schema.domainEventTable() + " WHERE (" + schema.globalIndexColumn() + " > ? AND " + schema.globalIndexColumn() + " <= ?) "; List<Long> gaps; if (previousToken != null) { gaps = new ArrayList<>(previousToken.getGaps()); if (!gaps.isEmpty()) { sql += " OR " + schema.globalIndexColumn() + " IN (" + String.join(",", Collections.nCopies(gaps.size(), "?")) + ") "; gaps = Collections.emptyList(); sql += "ORDER BY " + schema.globalIndexColumn() + " ASC"; PreparedStatement preparedStatement = connection.prepareStatement(sql); long globalIndex = previousToken == null ? -1 : previousToken.getIndex();
/** * Creates a statement to read the snapshot entry of an aggregate with given identifier. * * @param connection The connection to the database. * @param identifier The aggregate identifier. * @return A {@link PreparedStatement} that returns the last snapshot entry of the aggregate (if any) when executed. * * @throws SQLException when an exception occurs while creating the prepared statement. */ protected PreparedStatement readSnapshotData(Connection connection, String identifier) throws SQLException { final String s = "SELECT " + domainEventFields() + " FROM " + schema.snapshotTable() + " WHERE " + schema.aggregateIdentifierColumn() + " = ? ORDER BY " + schema.sequenceNumberColumn() + " DESC"; PreparedStatement statement = connection.prepareStatement(s); statement.setString(1, identifier); return statement; }
/** * Creates a statement to read domain event entries for an aggregate with given identifier starting with the first * entry having a sequence number that is equal or larger than the given {@code firstSequenceNumber}. * * @param connection The connection to the database. * @param identifier The identifier of the aggregate. * @param firstSequenceNumber The expected sequence number of the first returned entry. * @param batchSize The number of items to include in the batch * @return A {@link PreparedStatement} that returns event entries for the given query when executed. * @throws SQLException when an exception occurs while creating the prepared statement. */ protected PreparedStatement readEventData(Connection connection, String identifier, long firstSequenceNumber, int batchSize) throws SQLException { Transaction tx = transactionManager.startTransaction(); try { final String sql = "SELECT " + trackedEventFields() + " FROM " + schema.domainEventTable() + " WHERE " + schema.aggregateIdentifierColumn() + " = ? AND " + schema.sequenceNumberColumn() + " >= ? AND " + schema.sequenceNumberColumn() + " < ? ORDER BY " + schema.sequenceNumberColumn() + " ASC"; PreparedStatement preparedStatement = connection.prepareStatement(sql); preparedStatement.setString(1, identifier); preparedStatement.setLong(2, firstSequenceNumber); preparedStatement.setLong(3, firstSequenceNumber + batchSize); return preparedStatement; } finally { tx.commit(); } }