Examples with Command org.apache.gobblin.source.extractor.extract.Command used on opensource projects

Example 1 with Command

use of org.apache.gobblin.source.extractor.extract.Command in project incubator-gobblin by apache.

the class RestApiExtractor method extractMetadata.

@Override
public void extractMetadata(String schema, String entity, WorkUnit workUnit) throws SchemaException {
    log.info("Extract Metadata using Rest Api");
    JsonArray columnArray = new JsonArray();
    String inputQuery = workUnitState.getProp(ConfigurationKeys.SOURCE_QUERYBASED_QUERY);
    List<String> columnListInQuery = null;
    JsonArray array = null;
    if (!Strings.isNullOrEmpty(inputQuery)) {
        columnListInQuery = Utils.getColumnListFromQuery(inputQuery);
    }
    String excludedColumns = workUnitState.getProp(ConfigurationKeys.SOURCE_QUERYBASED_EXCLUDED_COLUMNS);
    List<String> columnListExcluded = ImmutableList.<String>of();
    if (Strings.isNullOrEmpty(inputQuery) && !Strings.isNullOrEmpty(excludedColumns)) {
        Splitter splitter = Splitter.on(",").omitEmptyStrings().trimResults();
        columnListExcluded = splitter.splitToList(excludedColumns.toLowerCase());
    }
    try {
        boolean success = this.connector.connect();
        if (!success) {
            throw new SchemaException("Failed to connect.");
        }
        log.debug("Connected successfully.");
        List<Command> cmds = this.getSchemaMetadata(schema, entity);
        CommandOutput<?, ?> response = this.connector.getResponse(cmds);
        array = this.getSchema(response);
        for (JsonElement columnElement : array) {
            Schema obj = GSON.fromJson(columnElement, Schema.class);
            String columnName = obj.getColumnName();
            obj.setWaterMark(this.isWatermarkColumn(workUnitState.getProp("extract.delta.fields"), columnName));
            if (this.isWatermarkColumn(workUnitState.getProp("extract.delta.fields"), columnName)) {
                obj.setNullable(false);
            } else if (this.getPrimarykeyIndex(workUnitState.getProp("extract.primary.key.fields"), columnName) == 0) {
                // set all columns as nullable except primary key and watermark columns
                obj.setNullable(true);
            }
            obj.setPrimaryKey(this.getPrimarykeyIndex(workUnitState.getProp("extract.primary.key.fields"), columnName));
            String jsonStr = GSON.toJson(obj);
            JsonObject jsonObject = GSON.fromJson(jsonStr, JsonObject.class).getAsJsonObject();
            // Else, consider only the columns mentioned in the column list
            if (inputQuery == null || columnListInQuery == null || (columnListInQuery.size() == 1 && columnListInQuery.get(0).equals("*")) || (columnListInQuery.size() >= 1 && this.isMetadataColumn(columnName, columnListInQuery))) {
                if (!columnListExcluded.contains(columnName.trim().toLowerCase())) {
                    this.columnList.add(columnName);
                    columnArray.add(jsonObject);
                }
            }
        }
        this.updatedQuery = buildDataQuery(inputQuery, entity);
        log.info("Schema:" + columnArray);
        this.setOutputSchema(columnArray);
    } catch (RuntimeException | RestApiConnectionException | RestApiProcessingException | IOException | SchemaException e) {
        throw new SchemaException("Failed to get schema using rest api; error - " + e.getMessage(), e);
    }
}

Example 2 with Command

use of org.apache.gobblin.source.extractor.extract.Command in project incubator-gobblin by apache.

the class JdbcExtractor method getRecordSet.

@Override
public Iterator<JsonElement> getRecordSet(String schema, String entity, WorkUnit workUnit, List<Predicate> predicateList) throws DataRecordException, IOException {
    Iterator<JsonElement> rs = null;
    List<Command> cmds;
    try {
        if (isFirstPull()) {
            this.log.info("Get data recordset using JDBC");
            cmds = this.getDataMetadata(schema, entity, workUnit, predicateList);
            this.dataResponse = this.executePreparedSql(cmds);
            this.setFirstPull(false);
        }
        rs = this.getData(this.dataResponse);
        return rs;
    } catch (Exception e) {
        throw new DataRecordException("Failed to get record set using JDBC; error - " + e.getMessage(), e);
    }
}

Example 3 with Command

use of org.apache.gobblin.source.extractor.extract.Command in project incubator-gobblin by apache.

the class JdbcExtractor method executeSql.

/**
 * Execute query using JDBC simple Statement Set fetch size
 *
 * @param cmds commands - query, fetch size
 * @return JDBC ResultSet
 * @throws Exception
 */
private CommandOutput<?, ?> executeSql(List<Command> cmds) {
    String query = null;
    int fetchSize = 0;
    for (Command cmd : cmds) {
        if (cmd instanceof JdbcCommand) {
            JdbcCommandType type = (JdbcCommandType) cmd.getCommandType();
            switch(type) {
                case QUERY:
                    query = cmd.getParams().get(0);
                    break;
                case FETCHSIZE:
                    fetchSize = Integer.parseInt(cmd.getParams().get(0));
                    break;
                default:
                    this.log.error("Command " + type.toString() + " not recognized");
                    break;
            }
        }
    }
    this.log.info("Executing query:" + query);
    ResultSet resultSet = null;
    try {
        this.jdbcSource = createJdbcSource();
        this.dataConnection = this.jdbcSource.getConnection();
        Statement statement = this.dataConnection.createStatement();
        if (fetchSize != 0 && this.getExpectedRecordCount() > 2000) {
            statement.setFetchSize(fetchSize);
        }
        final boolean status = statement.execute(query);
        if (status == false) {
            this.log.error("Failed to execute sql:" + query);
        }
        resultSet = statement.getResultSet();
    } catch (Exception e) {
        this.log.error("Failed to execute sql:" + query + " ;error-" + e.getMessage(), e);
    }
    CommandOutput<JdbcCommand, ResultSet> output = new JdbcCommandOutput();
    output.put((JdbcCommand) cmds.get(0), resultSet);
    return output;
}

Example 4 with Command

use of org.apache.gobblin.source.extractor.extract.Command in project incubator-gobblin by apache.

the class JdbcExtractor method executePreparedSql.

/**
 * Execute query using JDBC PreparedStatement to pass query parameters Set
 * fetch size
 *
 * @param cmds commands - query, fetch size, query parameters
 * @return JDBC ResultSet
 * @throws Exception
 */
private CommandOutput<?, ?> executePreparedSql(List<Command> cmds) {
    String query = null;
    List<String> queryParameters = null;
    int fetchSize = 0;
    for (Command cmd : cmds) {
        if (cmd instanceof JdbcCommand) {
            JdbcCommandType type = (JdbcCommandType) cmd.getCommandType();
            switch(type) {
                case QUERY:
                    query = cmd.getParams().get(0);
                    break;
                case QUERYPARAMS:
                    queryParameters = cmd.getParams();
                    break;
                case FETCHSIZE:
                    fetchSize = Integer.parseInt(cmd.getParams().get(0));
                    break;
                default:
                    this.log.error("Command " + type.toString() + " not recognized");
                    break;
            }
        }
    }
    this.log.info("Executing query:" + query);
    ResultSet resultSet = null;
    try {
        this.jdbcSource = createJdbcSource();
        this.dataConnection = this.jdbcSource.getConnection();
        PreparedStatement statement = this.dataConnection.prepareStatement(query, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
        int parameterPosition = 1;
        if (queryParameters != null && queryParameters.size() > 0) {
            for (String parameter : queryParameters) {
                statement.setString(parameterPosition, parameter);
                parameterPosition++;
            }
        }
        if (fetchSize != 0) {
            statement.setFetchSize(fetchSize);
        }
        final boolean status = statement.execute();
        if (status == false) {
            this.log.error("Failed to execute sql:" + query);
        }
        resultSet = statement.getResultSet();
    } catch (Exception e) {
        this.log.error("Failed to execute sql:" + query + " ;error-" + e.getMessage(), e);
    }
    CommandOutput<JdbcCommand, ResultSet> output = new JdbcCommandOutput();
    output.put((JdbcCommand) cmds.get(0), resultSet);
    return output;
}

Example 5 with Command

use of org.apache.gobblin.source.extractor.extract.Command in project incubator-gobblin by apache.

the class JdbcExtractor method extractMetadata.

@Override
public void extractMetadata(String schema, String entity, WorkUnit workUnit) throws SchemaException, IOException {
    this.log.info("Extract metadata using JDBC");
    String inputQuery = workUnitState.getProp(ConfigurationKeys.SOURCE_QUERYBASED_QUERY);
    if (hasJoinOperation(inputQuery)) {
        throw new RuntimeException("Query across multiple tables not supported");
    }
    String watermarkColumn = workUnitState.getProp(ConfigurationKeys.EXTRACT_DELTA_FIELDS_KEY);
    this.enableDelimitedIdentifier = workUnitState.getPropAsBoolean(ConfigurationKeys.ENABLE_DELIMITED_IDENTIFIER, ConfigurationKeys.DEFAULT_ENABLE_DELIMITED_IDENTIFIER);
    JsonObject defaultWatermark = this.getDefaultWatermark();
    String derivedWatermarkColumnName = defaultWatermark.get("columnName").getAsString();
    this.setSampleRecordCount(this.exractSampleRecordCountFromQuery(inputQuery));
    inputQuery = this.removeSampleClauseFromQuery(inputQuery);
    JsonArray targetSchema = new JsonArray();
    List<String> headerColumns = new ArrayList<>();
    try {
        List<Command> cmds = this.getSchemaMetadata(schema, entity);
        CommandOutput<?, ?> response = this.executePreparedSql(cmds);
        JsonArray array = this.getSchema(response);
        this.buildMetadataColumnMap(array);
        this.parseInputQuery(inputQuery);
        List<String> sourceColumns = this.getMetadataColumnList();
        for (ColumnAttributes colMap : this.columnAliasMap) {
            String alias = colMap.getAliasName();
            String columnName = colMap.getColumnName();
            String sourceColumnName = colMap.getSourceColumnName();
            if (this.isMetadataColumn(columnName, sourceColumns)) {
                String targetColumnName = this.getTargetColumnName(columnName, alias);
                Schema obj = this.getUpdatedSchemaObject(columnName, alias, targetColumnName);
                String jsonStr = gson.toJson(obj);
                JsonObject jsonObject = gson.fromJson(jsonStr, JsonObject.class).getAsJsonObject();
                targetSchema.add(jsonObject);
                headerColumns.add(targetColumnName);
                sourceColumnName = getLeftDelimitedIdentifier() + sourceColumnName + getRightDelimitedIdentifier();
                this.columnList.add(sourceColumnName);
            }
        }
        if (this.hasMultipleWatermarkColumns(watermarkColumn)) {
            derivedWatermarkColumnName = getLeftDelimitedIdentifier() + derivedWatermarkColumnName + getRightDelimitedIdentifier();
            this.columnList.add(derivedWatermarkColumnName);
            headerColumns.add(derivedWatermarkColumnName);
            targetSchema.add(defaultWatermark);
            this.workUnitState.setProp(ConfigurationKeys.EXTRACT_DELTA_FIELDS_KEY, derivedWatermarkColumnName);
        }
        String outputColProjection = Joiner.on(",").useForNull("null").join(this.columnList);
        outputColProjection = outputColProjection.replace(derivedWatermarkColumnName, Utils.getCoalesceColumnNames(watermarkColumn) + " AS " + derivedWatermarkColumnName);
        this.setOutputColumnProjection(outputColProjection);
        String extractQuery = this.getExtractQuery(schema, entity, inputQuery);
        this.setHeaderRecord(headerColumns);
        this.setOutputSchema(targetSchema);
        this.setExtractSql(extractQuery);
        // this.workUnit.getProp(ConfigurationKeys.EXTRACT_TABLE_NAME_KEY,
        // this.escapeCharsInColumnName(this.workUnit.getProp(ConfigurationKeys.SOURCE_ENTITY),
        // ConfigurationKeys.ESCAPE_CHARS_IN_COLUMN_NAME, "_"));
        this.log.info("Schema:" + targetSchema);
        this.log.info("Extract query: " + this.getExtractSql());
    } catch (RuntimeException | IOException | SchemaException e) {
        throw new SchemaException("Failed to get metadata using JDBC; error - " + e.getMessage(), e);
    }
}