/*
* 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.python.api.streaming.data;
import org.apache.flink.configuration.Configuration;
import java.io.IOException;
/**
* This class is a {@link PythonSender} for operations with one input stream.
*
* @param <IN> input type
*/
public class PythonSingleInputSender<IN> extends PythonSender {
private static final long serialVersionUID = 614115041181108878L;
private transient Serializer<IN> serializer;
protected PythonSingleInputSender(Configuration config) {
super(config);
}
/**
* Extracts records from an iterator and writes them to the memory-mapped file. This method assumes that all values
* in the iterator are of the same type. This method does NOT take care of synchronization. The caller must
* guarantee that the file may be written to before calling this method.
*
* @param input iterator containing records
* @return size of the written buffer
* @throws IOException
*/
public int sendBuffer(SingleElementPushBackIterator<IN> input) throws IOException {
if (serializer == null) {
IN value = input.next();
serializer = getSerializer(value);
input.pushBack(value);
}
return sendBuffer(input, serializer);
}
}