Examples with Database org.apache.rocketmq.connect.cassandra.schema.Database used on opensource projects

Example 1 with Database

use of org.apache.rocketmq.connect.cassandra.schema.Database in project rocketmq-externals by apache.

the class Querier method poll.

public void poll() {
    try {
        LinkedList<Table> tableLinkedList = new LinkedList<>();
        for (Map.Entry<String, Database> entry : schema.getDbMap().entrySet()) {
            String dbName = entry.getKey();
            Iterator<Map.Entry<String, Table>> iterator = entry.getValue().getTableMap().entrySet().iterator();
            while (iterator.hasNext()) {
                Map.Entry<String, Table> tableEntry = iterator.next();
                String tableName = tableEntry.getKey();
                Table table = tableEntry.getValue();
                Map<String, String> tableFilterMap = table.getFilterMap();
                Select selectFrom = QueryBuilder.selectFrom(dbName, tableName).all();
                if (tableFilterMap != null && !tableFilterMap.keySet().contains("NO-FILTER")) {
                    for (String key : tableFilterMap.keySet()) {
                        String value = tableFilterMap.get(key);
                        selectFrom.whereColumn(key).isEqualTo(QueryBuilder.literal(value));
                    }
                }
                SimpleStatement stmt;
                boolean finishUpdate = false;
                log.info("trying to execute sql query,{}", selectFrom.asCql());
                ResultSet result = null;
                while (!cqlSession.isClosed() && !finishUpdate) {
                    stmt = selectFrom.build();
                    result = cqlSession.execute(stmt);
                    if (result.wasApplied()) {
                        log.info("query columns success, executed cql query {}", selectFrom.asCql());
                    }
                    finishUpdate = true;
                }
                List<String> colList = tableEntry.getValue().getColList();
                List<String> dataTypeList = tableEntry.getValue().getRawDataTypeList();
                List<ColumnParser> parserList = tableEntry.getValue().getParserList();
                for (Row row : result) {
                    Table tableWithData = new Table(dbName, tableName);
                    tableWithData.setColList(colList);
                    tableWithData.setRawDataTypeList(dataTypeList);
                    tableWithData.setParserList(parserList);
                    for (String col : colList) {
                        tableWithData.getDataList().add(row.getObject(col));
                    }
                    tableLinkedList.add(tableWithData);
                }
            }
        }
        list = tableLinkedList;
    } catch (Exception e) {
        log.error("fail to poll data, {}", e);
    }
}