1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
/*
* 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.
*/
#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;
}
|
