lang/c++/examples/datafile.cc

/**
 * 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
 *
 *     https://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.
 */

#include <fstream>

#include "cpx.hh"
#include "avro/Encoder.hh"
#include "avro/Decoder.hh"
#include "avro/ValidSchema.hh"
#include "avro/Compiler.hh"
#include "avro/DataFile.hh"


avro::ValidSchema loadSchema(const char* filename)
{
    std::ifstream ifs(filename);
    avro::ValidSchema result;
    avro::compileJsonSchema(ifs, result);
    return result;
}

int
main()
{
    avro::ValidSchema cpxSchema = loadSchema("cpx.json");

    {
        avro::DataFileWriter<c::cpx> dfw("test.bin", cpxSchema);
        c::cpx c1;
        for (int i = 0; i < 100; i++) {
            c1.re = i * 100;
            c1.im = i + 100;
            dfw.write(c1);
        }
        dfw.close();
    }

    {
        avro::DataFileReader<c::cpx> dfr("test.bin", cpxSchema);
        c::cpx c2;
        while (dfr.read(c2)) {
            std::cout << '(' << c2.re << ", " << c2.im << ')' << std::endl;
        }
    }
    return 0;
}