/*
* 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.api.common.operators.base;
import org.apache.flink.annotation.Internal;
import org.apache.flink.annotation.Public;
import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.api.common.functions.CrossFunction;
import org.apache.flink.api.common.functions.RuntimeContext;
import org.apache.flink.api.common.functions.util.FunctionUtils;
import org.apache.flink.api.common.operators.BinaryOperatorInformation;
import org.apache.flink.api.common.operators.DualInputOperator;
import org.apache.flink.api.common.operators.util.UserCodeClassWrapper;
import org.apache.flink.api.common.operators.util.UserCodeObjectWrapper;
import org.apache.flink.api.common.operators.util.UserCodeWrapper;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import java.util.ArrayList;
import java.util.List;
/**
* @see org.apache.flink.api.common.functions.CrossFunction
*/
@Internal
public class CrossOperatorBase<IN1, IN2, OUT, FT extends CrossFunction<IN1, IN2, OUT>> extends DualInputOperator<IN1, IN2, OUT, FT> {
/**
* The cross hint tells the system which sizes to expect from the data sets
*/
@Public
public static enum CrossHint {
OPTIMIZER_CHOOSES,
FIRST_IS_SMALL,
SECOND_IS_SMALL
}
// --------------------------------------------------------------------------------------------
private CrossHint hint = CrossHint.OPTIMIZER_CHOOSES;
public CrossOperatorBase(UserCodeWrapper<FT> udf, BinaryOperatorInformation<IN1, IN2, OUT> operatorInfo, String name) {
super(udf, operatorInfo, name);
if (this instanceof CrossWithSmall) {
setCrossHint(CrossHint.SECOND_IS_SMALL);
}
else if (this instanceof CrossWithLarge) {
setCrossHint(CrossHint.FIRST_IS_SMALL);
}
}
public CrossOperatorBase(FT udf, BinaryOperatorInformation<IN1, IN2, OUT> operatorInfo, String name) {
this(new UserCodeObjectWrapper<FT>(udf), operatorInfo, name);
}
public CrossOperatorBase(Class<? extends FT> udf, BinaryOperatorInformation<IN1, IN2, OUT> operatorInfo, String name) {
this(new UserCodeClassWrapper<FT>(udf), operatorInfo, name);
}
public void setCrossHint(CrossHint hint) {
this.hint = hint == null ? CrossHint.OPTIMIZER_CHOOSES : hint;
}
public CrossHint getCrossHint() {
return hint;
}
// --------------------------------------------------------------------------------------------
@Override
protected List<OUT> executeOnCollections(List<IN1> inputData1, List<IN2> inputData2, RuntimeContext ctx, ExecutionConfig executionConfig) throws Exception {
CrossFunction<IN1, IN2, OUT> function = this.userFunction.getUserCodeObject();
FunctionUtils.setFunctionRuntimeContext(function, ctx);
FunctionUtils.openFunction(function, this.parameters);
ArrayList<OUT> result = new ArrayList<OUT>(inputData1.size() * inputData2.size());
TypeSerializer<IN1> inSerializer1 = getOperatorInfo().getFirstInputType().createSerializer(executionConfig);
TypeSerializer<IN2> inSerializer2 = getOperatorInfo().getSecondInputType().createSerializer(executionConfig);
TypeSerializer<OUT> outSerializer = getOperatorInfo().getOutputType().createSerializer(executionConfig);
for (IN1 element1 : inputData1) {
for (IN2 element2 : inputData2) {
IN1 copy1 = inSerializer1.copy(element1);
IN2 copy2 = inSerializer2.copy(element2);
OUT o = function.cross(copy1, copy2);
result.add(outSerializer.copy(o));
}
}
FunctionUtils.closeFunction(function);
return result;
}
// --------------------------------------------------------------------------------------------
/**
* Marker interface to declare the second input as the smaller one.
*/
public static interface CrossWithSmall {}
/**
* Marker interface to declare the second input as the larger one.
*/
public static interface CrossWithLarge {}
}