org.apache.flink.table.planner.codegen.CollectorCodeGenerator.scala Maven / Gradle / Ivy
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This module bridges Table/SQL API and runtime. It contains
all resources that are required during pre-flight and runtime
phase. The content of this module is work-in-progress. It will
replace flink-table-planner once it is stable. See FLINK-11439
and FLIP-32 for more details.
/*
* 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.flink.table.planner.codegen
import org.apache.flink.configuration.Configuration
import org.apache.flink.table.planner.codegen.CodeGenUtils._
import org.apache.flink.table.planner.codegen.Indenter.toISC
import org.apache.flink.table.runtime.collector.{TableFunctionCollector, WrappingCollector}
import org.apache.flink.table.runtime.generated.GeneratedCollector
import org.apache.flink.table.types.logical.LogicalType
import org.apache.flink.util.Collector
/**
* A code generator for generating [[Collector]]s.
*/
object CollectorCodeGenerator {
/**
* Generates a [[TableFunctionCollector]] that can be passed to Java compiler.
*
* @param ctx The context of the code generator
* @param name Class name of the table function collector. Must not be unique but has to be a
* valid Java class identifier.
* @param bodyCode body code for the collector method
* @param inputType The type of the element being collected
* @param collectedType The type of the element collected by the collector
* @param inputTerm The term of the input element
* @param collectedTerm The term of the collected element
* @return instance of GeneratedCollector
*/
def generateTableFunctionCollector(
ctx: CodeGeneratorContext,
name: String,
bodyCode: String,
inputType: LogicalType,
collectedType: LogicalType,
inputTerm: String = CodeGenUtils.DEFAULT_INPUT1_TERM,
collectedTerm: String = CodeGenUtils.DEFAULT_INPUT2_TERM)
: GeneratedCollector[TableFunctionCollector[_]] = {
val funcName = newName(name)
val input1TypeClass = boxedTypeTermForType(inputType)
val input2TypeClass = boxedTypeTermForType(collectedType)
val funcCode =
j"""
public class $funcName extends ${classOf[TableFunctionCollector[_]].getCanonicalName} {
${ctx.reuseMemberCode()}
public $funcName() throws Exception {
${ctx.reuseInitCode()}
}
@Override
public void open(${className[Configuration]} parameters) throws Exception {
${ctx.reuseOpenCode()}
}
@Override
public void collect(Object record) throws Exception {
$input1TypeClass $inputTerm = ($input1TypeClass) getInput();
$input2TypeClass $collectedTerm = ($input2TypeClass) record;
${ctx.reuseLocalVariableCode()}
${ctx.reuseInputUnboxingCode()}
${ctx.reusePerRecordCode()}
$bodyCode
}
@Override
public void close() {
try {
${ctx.reuseCloseCode()}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
""".stripMargin
new GeneratedCollector(funcName, funcCode, ctx.references.toArray)
}
/**
* Generates a [[Collector]] that wraps another [[Collector]].
*
* @param ctx The context of the code generator
* @param name Class name of the collector. Must not be unique but has to be a
* valid Java class identifier.
* @param inputType The type of the element being collected
* @param inputTerm The term of the input element
* @param inputConversion The term for converting the input
* @param bodyCode body code for the collector method
* @return instance of GeneratedCollector
*/
def generateWrappingCollector(
ctx: CodeGeneratorContext,
name: String,
inputType: LogicalType,
inputTerm: String,
inputConversion: (String) => String,
bodyCode: String)
: GeneratedCollector[WrappingCollector[_]] = {
val funcName = newName(name)
val inputTypeTerm = boxedTypeTermForType(inputType)
val funcCode =
j"""
public class $funcName extends ${className[WrappingCollector[_]]} {
${ctx.reuseMemberCode()}
public $funcName() throws Exception {
${ctx.reuseInitCode()}
}
@Override
public void open(${className[Configuration]} parameters) throws Exception {
${ctx.reuseOpenCode()}
}
@Override
public void collect(Object record) throws Exception {
$inputTypeTerm $inputTerm = ($inputTypeTerm) ${inputConversion("record")};
${ctx.reuseLocalVariableCode()}
${ctx.reuseInputUnboxingCode()}
${ctx.reusePerRecordCode()}
$bodyCode
}
@Override
public void close() {
try {
${ctx.reuseCloseCode()}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
""".stripMargin
new GeneratedCollector(funcName, funcCode, ctx.references.toArray)
}
def addToContext(
ctx: CodeGeneratorContext,
collectorTerm: String,
generatedCollector: GeneratedCollector[_])
: Unit = {
ctx.addReusableMember(s"private ${generatedCollector.getClassName} $collectorTerm = null;")
ctx.addReusableInnerClass(generatedCollector.getClassName, generatedCollector.getCode)
val openCollector =
s"""
|$collectorTerm = new ${generatedCollector.getClassName}();
|$collectorTerm.setRuntimeContext(getRuntimeContext());
|$collectorTerm.open(new ${className[Configuration]}());
|""".stripMargin
ctx.addReusableOpenStatement(openCollector)
ctx.references ++= generatedCollector.getReferences
}
}