YARP  2.3.68+228-20170410.2+git7d0b2e0
Yet Another Robot Platform
os/database.cpp

A toy "database" program for storing and fetching key-values, accessible from a port.

/*
* Copyright: (C) 2010 RobotCub Consortium
* Author: Paul Fitzpatrick
* CopyPolicy: Released under the terms of the LGPLv2.1 or later, see LGPL.TXT
*/
#include <stdio.h>
#include <yarp/os/all.h>
using namespace yarp::os;
#define VOCAB_SET VOCAB3('s','e','t')
#define VOCAB_GET VOCAB3('g','e','t')
#define VOCAB_NOT VOCAB3('n','o','t')
#define VOCAB_IS VOCAB2('i','s')
#define VOCAB_REMOVE VOCAB2('r','m')
int main(int argc, char *argv[]) {
if (argc<=1) {
printf("This is a very simple database\n");
printf("Call as: %s --name /database\n", argv[0]);
printf("Then you can test it by running:\n");
printf(" yarp rpc /database\n");
printf("And typing things like:\n");
printf(" set x 24\n");
printf(" get x\n");
printf(" get y\n");
printf(" rm x\n");
printf(" get x\n");
printf(" set \"my favorite numbers\" (5 10 16)\n");
printf(" get \"my favorite numbers\"\n");
}
Property option;
option.fromCommand(argc,argv);
Port port;
port.open(option.check("name",Value("/database")).asString());
while (true) {
Bottle cmd;
Bottle response;
port.read(cmd,true); // true -> will reply
Bottle tmp;
tmp.add(cmd.get(1));
ConstString key = tmp.toString();
switch (Vocab::encode(cmd.get(0).toString())) {
case VOCAB_SET:
state.put(key,cmd.get(2));
break;
case VOCAB_GET:
break;
case VOCAB_REMOVE:
state.unput(key);
break;
}
Value& v = state.find(key);
response.addVocab(v.isNull()?VOCAB_NOT:VOCAB_IS);
response.add(cmd.get(1));
if (!v.isNull()) {
response.add(v);
}
port.reply(response);
}
return 0;
}