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/*
* 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 <stdio.h>
#include "avro.h"
#define NUM_RECORDS 10
const char PERSON_SCHEMA[] =
"{"
" \"type\":\"record\","
" \"name\":\"Person\","
" \"fields\": ["
" {\"name\": \"ID\", \"type\": \"long\"},"
" {\"name\": \"First\", \"type\": \"string\"},"
" {\"name\": \"Last\", \"type\": \"string\"},"
" {\"name\": \"Phone\", \"type\": \"string\"},"
" {\"name\": \"Age\", \"type\": \"int\"}"
" ]"
"}";
const char *file = "avro_file.dat";
void print_avro_value(avro_value_t *value) {
char *json;
if (!avro_value_to_json(value, 1, &json)) {
printf("%s\n", json);
free(json);
}
}
int read_data() {
int rval;
int records_read = 0;
avro_file_reader_t reader;
avro_value_iface_t *iface;
avro_value_t value;
avro_file_reader(file, &reader);
avro_schema_t schema = avro_file_reader_get_writer_schema(reader);
iface = avro_generic_class_from_schema(schema);
avro_generic_value_new(iface, &value);
printf("\nReading...\n");
while ((rval = avro_file_reader_read_value(reader, &value)) == 0) {
char *json;
if (avro_value_to_json(&value, 1, &json)) {
printf("Error converting value to JSON: %s\n",avro_strerror());
} else {
printf("%s\n", json);
free(json);
records_read++;
}
avro_value_reset(&value);
}
avro_value_decref(&value);
avro_value_iface_decref(iface);
avro_schema_decref(schema);
avro_file_reader_close(reader);
if (rval != EOF || records_read != NUM_RECORDS) {
fprintf(stderr, "Error: %s\n", avro_strerror());
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
int write_data() {
int i;
avro_schema_t schema;
avro_schema_error_t error;
avro_file_writer_t writer;
avro_value_iface_t *iface;
avro_value_t value;
if (avro_schema_from_json(PERSON_SCHEMA, 0, &schema, &error)) {
printf ("Unable to parse schema\n");
return EXIT_FAILURE;
}
iface = avro_generic_class_from_schema(schema);
avro_generic_value_new(iface, &value);
if (avro_file_writer_create(file, schema, &writer)) {
printf ("There was an error creating file: %s\n", avro_strerror());
return EXIT_FAILURE;
}
printf("\nWriting...\n");
for (i = 0; i < NUM_RECORDS; i++) {
avro_value_t field;
avro_value_get_by_name(&value, "ID", &field, NULL);
avro_value_set_long(&field, (int64_t) i);
avro_value_get_by_name(&value, "Age", &field, NULL);
avro_value_set_int(&field, i);
avro_value_get_by_name(&value, "First", &field, NULL);
avro_value_set_string(&field, "Firstname");
avro_value_get_by_name(&value, "Last", &field, NULL);
avro_value_set_string(&field, "Lastname");
avro_value_get_by_name(&value, "Phone", &field, NULL);
avro_value_set_string(&field, "1234567");
print_avro_value(&value);
avro_file_writer_append_value(writer, &value);
// Writing multiple blocks
avro_file_writer_close(writer);
avro_file_writer_open(file, &writer);
avro_value_reset(&value);
}
avro_file_writer_close(writer);
avro_value_iface_decref(iface);
avro_value_decref(&value);
avro_schema_decref(schema);
return EXIT_SUCCESS;
}
int main()
{
int read_data_result;
if (write_data()) {
return EXIT_FAILURE;
}
read_data_result = read_data();
remove(file);
return read_data_result;
}
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