string HTWorker::compare_swap_internal(const ZPack &zpack) {
string ret;
/*get Package stored by lookup*/
string lresult = lookup_shared(zpack);
ZPack lzpack;
lresult = erase_status_code(lresult);
lzpack.ParseFromString(lresult);
/*get seen_value passed in*/
string seen_value_passed_in = zpack.val();
/*get seen_value stored*/
string seen_value_stored = lzpack.val();
/* printf("{%s}:{%s,%s}\n", zpack.key().c_str(), zpack.val().c_str(),
zpack.newval().c_str());*/
/*they are equivalent, compare and swap*/
if (!seen_value_passed_in.compare(seen_value_stored)) {
lzpack.set_val(zpack.newval());
return insert_shared(lzpack);
} else {
return Const::ZSC_REC_SRVEXP;
}
}
string HTWorker::state_change_callback_internal(const ZPack &zpack) {
string result;
if (zpack.key().empty())
return Const::ZSC_REC_EMPTYKEY; //-1
string key = zpack.key();
string *ret = PMAP->get(key);
if (ret == NULL) {
printf("thread[%lu] DB Error: lookup found nothing\n", pthread_self());
fflush(stdout);
result = Const::ZSC_REC_NONEXISTKEY;
} else {
ZPack rltpack;
rltpack.ParseFromString(*ret);
if (zpack.val() == rltpack.val()) {
result = Const::ZSC_REC_SUCC; //0, succeed.
} else {
result = Const::ZSC_REC_SCCBPOLLTRY;
}
}
return result;
}
string ZHTClient::extract_value(const string &returnStr) {
string val;
StrTokenizer strtok(returnStr, ":");
/*
* hello,zht:hello,ZHT ==> zht:ZHT
* */
if (strtok.has_more_tokens()) {
while (strtok.has_more_tokens()) {
ZPack zpack;
zpack.ParseFromString(strtok.next_token());
if (zpack.valnull())
val.append("");
else
val.append(zpack.val());
val.append(":");
}
size_t found = val.find_last_of(":");
val = val.substr(0, found);
} else {
ZPack zpack;
zpack.ParseFromString(returnStr);
if (zpack.valnull())
val = "";
else
val = zpack.val();
}
return val;
}