Github user olegz commented on a diff in the pull request: https://github.com/apache/nifi/pull/1652#discussion_r110541217 --- Diff: nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/QueryFlowFile.java --- @@ -0,0 +1,550 @@ +/* + * 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.nifi.processors.standard; + +import java.io.Closeable; +import java.io.IOException; +import java.io.OutputStream; +import java.sql.Connection; +import java.sql.DriverManager; +import java.sql.PreparedStatement; +import java.sql.ResultSet; +import java.sql.SQLException; +import java.sql.Statement; +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Properties; +import java.util.Set; +import java.util.concurrent.BlockingQueue; +import java.util.concurrent.LinkedBlockingQueue; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicReference; +import java.util.function.Supplier; + +import org.apache.calcite.config.CalciteConnectionProperty; +import org.apache.calcite.config.Lex; +import org.apache.calcite.jdbc.CalciteConnection; +import org.apache.calcite.schema.SchemaPlus; +import org.apache.calcite.sql.parser.SqlParser; +import org.apache.nifi.annotation.behavior.DynamicProperty; +import org.apache.nifi.annotation.behavior.DynamicRelationship; +import org.apache.nifi.annotation.behavior.EventDriven; +import org.apache.nifi.annotation.behavior.InputRequirement; +import org.apache.nifi.annotation.behavior.InputRequirement.Requirement; +import org.apache.nifi.annotation.behavior.SideEffectFree; +import org.apache.nifi.annotation.behavior.SupportsBatching; +import org.apache.nifi.annotation.documentation.CapabilityDescription; +import org.apache.nifi.annotation.documentation.Tags; +import org.apache.nifi.annotation.lifecycle.OnScheduled; +import org.apache.nifi.annotation.lifecycle.OnStopped; +import org.apache.nifi.components.PropertyDescriptor; +import org.apache.nifi.components.ValidationContext; +import org.apache.nifi.components.ValidationResult; +import org.apache.nifi.components.Validator; +import org.apache.nifi.flowfile.FlowFile; +import org.apache.nifi.flowfile.attributes.CoreAttributes; +import org.apache.nifi.processor.AbstractProcessor; +import org.apache.nifi.processor.ProcessContext; +import org.apache.nifi.processor.ProcessSession; +import org.apache.nifi.processor.ProcessorInitializationContext; +import org.apache.nifi.processor.Relationship; +import org.apache.nifi.processor.exception.ProcessException; +import org.apache.nifi.processor.io.OutputStreamCallback; +import org.apache.nifi.queryflowfile.FlowFileTable; +import org.apache.nifi.serialization.RecordSetWriter; +import org.apache.nifi.serialization.RecordSetWriterFactory; +import org.apache.nifi.serialization.RowRecordReaderFactory; +import org.apache.nifi.serialization.WriteResult; +import org.apache.nifi.serialization.record.ResultSetRecordSet; +import org.apache.nifi.util.StopWatch; + +@EventDriven +@SideEffectFree +@SupportsBatching +@Tags({"sql", "query", "calcite", "route", "record", "transform", "select", "update", "modify", "etl", "filter", "record", "csv", "json", "logs", "text", "avro", "aggregate"}) +@InputRequirement(Requirement.INPUT_REQUIRED) +@CapabilityDescription("Evaluates one or more SQL queries against the contents of a FlowFile. The result of the " + + "SQL query then becomes the content of the output FlowFile. This can be used, for example, " + + "for field-specific filtering, transformation, and row-level filtering. " + + "Columns can be renamed, simple calculations and aggregations performed, etc. " + + "The Processor is configured with a Record Reader Controller Service and a Record Writer service so as to allow flexibility in incoming and outgoing data formats. " + + "The Processor must be configured with at least one user-defined property. The name of the Property " + + "is the Relationship to route data to, and the value of the Property is a SQL SELECT statement that is used to specify how input data should be transformed/filtered. " + + "The SQL statement must be valid ANSI SQL and is powered by Apache Calcite. " + + "If the transformation fails, the original FlowFile is routed to the 'failure' relationship. Otherwise, the data selected will be routed to the associated " + + "relationship. See the Processor Usage documentation for more information.") +@DynamicRelationship(name="<Property Name>", description="Each user-defined property defines a new Relationship for this Processor.") +@DynamicProperty(name = "The name of the relationship to route data to", value="A SQL SELECT statement that is used to determine what data should be routed to this " + + "relationship.", supportsExpressionLanguage=true, description="Each user-defined property specifies a SQL SELECT statement to run over the data, with the data " + + "that is selected being routed to the relationship whose name is the property name") +public class QueryFlowFile extends AbstractProcessor { + static final PropertyDescriptor RECORD_READER_FACTORY = new PropertyDescriptor.Builder() + .name("Record Reader") + .description("Specifies the Controller Service to use for parsing incoming data and determining the data's schema") + .identifiesControllerService(RowRecordReaderFactory.class) + .required(true) + .build(); + static final PropertyDescriptor RECORD_WRITER_FACTORY = new PropertyDescriptor.Builder() + .name("Record Writer") + .description("Specifies the Controller Service to use for writing results to a FlowFile") + .identifiesControllerService(RecordSetWriterFactory.class) + .required(true) + .build(); + static final PropertyDescriptor INCLUDE_ZERO_RECORD_FLOWFILES = new PropertyDescriptor.Builder() + .name("Include Zero Record FlowFiles") + .description("When running the SQL statement against an incoming FlowFile, if the result has no data, " + + "this property specifies whether or not a FlowFile will be sent to the corresponding relationship") + .expressionLanguageSupported(false) + .allowableValues("true", "false") + .defaultValue("true") + .required(true) + .build(); + static final PropertyDescriptor CACHE_SCHEMA = new PropertyDescriptor.Builder() + .name("Cache Schema") + .description("Parsing the SQL query and deriving the FlowFile's schema is relatively expensive. If this value is set to true, " + + "the Processor will cache these values so that the Processor is much more efficient and much faster. However, if this is done, " + + "then the schema that is derived for the first FlowFile processed must apply to all FlowFiles. If all FlowFiles will not have the exact " + + "same schema, or if the SQL SELECT statement uses the Expression Language, this value should be set to false.") + .expressionLanguageSupported(false) + .allowableValues("true", "false") + .defaultValue("true") + .required(true) + .build(); + + public static final Relationship REL_ORIGINAL = new Relationship.Builder() + .name("original") + .description("The original FlowFile is routed to this relationship") + .build(); + public static final Relationship REL_FAILURE = new Relationship.Builder() + .name("failure") + .description("If a FlowFile fails processing for any reason (for example, the SQL " + + "statement contains columns not present in input data), the original FlowFile it will " + + "be routed to this relationship") + .build(); + + private List<PropertyDescriptor> properties; + private final Set<Relationship> relationships = Collections.synchronizedSet(new HashSet<>()); + + private final Map<String, BlockingQueue<CachedStatement>> statementQueues = new HashMap<>(); + + @Override + protected void init(final ProcessorInitializationContext context) { + try { + DriverManager.registerDriver(new org.apache.calcite.jdbc.Driver()); + } catch (final SQLException e) { + throw new ProcessException("Failed to load Calcite JDBC Driver", e); + } + + final List<PropertyDescriptor> properties = new ArrayList<>(); + properties.add(RECORD_READER_FACTORY); + properties.add(RECORD_WRITER_FACTORY); + properties.add(INCLUDE_ZERO_RECORD_FLOWFILES); + properties.add(CACHE_SCHEMA); + this.properties = Collections.unmodifiableList(properties); + + relationships.add(REL_FAILURE); + relationships.add(REL_ORIGINAL); + } --- End diff -- Given that this code executes several times during the lifecycle of the processor, consider static initializer.
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