// if there aren't enough replicas of this chunk,
// pick new hosts and start downloads
//
int CHUNK::assign() {
if (!present_on_server) return 0;
VDA_FILE_AUX* fp = parent->dfile;
while ((int)(hosts.size()) < fp->policy.replication) {
#if 0
if (parent->dfile->unused_hosts.size() == 0) {
die("no more hosts!\n");
}
set<SIM_HOST*>::iterator i = fp->unused_hosts.begin();
SIM_HOST* h = *i;
fp->unused_hosts.erase(i);
#else
SIM_HOST* h = new SIM_HOST;
sim.insert(h);
#endif
CHUNK_ON_HOST *c = new CHUNK_ON_HOST();
sprintf(c->physical_file_name, "chunk %s on host %d", name, h->id);
#ifdef EVENT_DEBUG
printf("%s: assigning chunk %s to host %d\n", now_str(), name, h->id);
#endif
c->host = h;
c->chunk = this;
h->chunks.insert(c);
hosts.insert(c);
c->start_download();
}
return 0;
}
// if there aren't enough replicas of this chunk,
// pick new hosts and start downloads
//
void CHUNK::assign() {
if (!present_on_server) return;
while ((int)(hosts.size()) < p.replication) {
#if 0
if (parent->dfile->unused_hosts.size() == 0) {
die("no more hosts!\n");
}
set<HOST*>::iterator i = parent->dfile->unused_hosts.begin();
HOST* h = *i;
parent->dfile->unused_hosts.erase(i);
#else
HOST* h = new HOST;
sim.insert(h);
#endif
CHUNK_ON_HOST *c = new CHUNK_ON_HOST();
sprintf(c->name, "chunk %s on host %d", name, h->id);
#ifdef EVENT_DEBUG
printf("%s: assigning chunk %s to host %d\n", now_str(), name, h->id);
#endif
c->host = h;
c->chunk = this;
h->chunks.insert(c);
hosts.insert(c);
c->start_download();
}
}
bool CHUNK::download_in_progress() {
set<CHUNK_ON_HOST*>::iterator i;
for (i=hosts.begin(); i!=hosts.end(); i++) {
CHUNK_ON_HOST* c = *i;
if (c->download_in_progress()) return true;
}
return false;
}
void CHUNK::start_upload() {
// if no upload of this chunk is in progress, start one.
// NOTE: all instances are inherently present_on_host,
// since this is only called if chunk is not present on server
//
CHUNK_ON_HOST* c;
set<CHUNK_ON_HOST*>::iterator i;
for (i=hosts.begin(); i!=hosts.end(); i++) {
c = *i;
if (c->transfer_in_progress) return;
}
c = *(hosts.begin());
c->start_upload();
}
// the host has failed
//
void SIM_HOST::handle() {
set<SIM_HOST*>::iterator i = hosts.find(this);
hosts.erase(i);
#ifdef EVENT_DEBUG
printf("%s: host %d failed\n", now_str(), id);
#endif
set<CHUNK_ON_HOST*>::iterator p;
for (p = chunks.begin(); p != chunks.end(); p++) {
CHUNK_ON_HOST* c = *p;
c->chunk->host_failed(c);
c->remove();
delete c;
}
}