DSFileStream *DSFileStream::makeFromPath(const Common::String &path, bool writeMode) {
FILE *handle = std_fopen(path.c_str(), writeMode ? "wb" : "rb");
if (handle)
return new DSFileStream(handle);
return 0;
}
void
xml_topology_generate(const char *filename,
int nnodes,
float min_band,
float max_band,
int seed
){
float band;
char hostname[20];
int c = 0;
int event;
int node_added = 0;
long_vector_t elemstack = long_vector_create(1);
FILE *fp = std_fopen(filename, "w");
srand(seed);
push_element(fp, XML_TOPOLOGY_TAG_CLUSTER, elemstack, -2.0, NULL);
push_element(fp, XML_TOPOLOGY_TAG_SWITCH, elemstack, -2.0, NULL);
while(long_vector_size(elemstack)){
event = rand() % 3; /* kinda ad-hoc */
switch(event){
case 0: /* new host */
if(c == nnodes) continue;
sprintf(hostname, "NODE:%d", c ++);
band = (float)rand() / RAND_MAX * (max_band - min_band) + min_band;
push_element(fp, XML_TOPOLOGY_TAG_NODE, elemstack, band, hostname);
node_added = 1;
break;
case 1: /* new switch */
if(c == nnodes) continue;
band = (float)rand() / RAND_MAX * (max_band - min_band) + min_band;
push_element(fp, XML_TOPOLOGY_TAG_SWITCH, elemstack, band, "SWITCH");
node_added = 0;
break;
case 2: /* close switch */
if(node_added == 0) continue;
if(long_vector_size(elemstack) <= 2 && c < nnodes) continue;
pop_element(fp, elemstack);
break;
}
}
long_vector_destroy(elemstack);
}
