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token_metadata: Make get_endpoint_for_host_id return optional

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This commit is contained in:
Asias He
2015-08-04 10:17:54 +08:00
parent 66f5cfaf39
commit 9dc155a8ef
2 changed files with 7 additions and 4 deletions
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9
locator/token_metadata.cc
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@@ -182,14 +182,17 @@ utils::UUID token_metadata::get_host_id(inet_address endpoint) {
return _endpoint_to_host_id_map.at(endpoint);
}
gms::inet_address token_metadata::get_endpoint_for_host_id(UUID host_id) {
std::experimental::optional<inet_address> token_metadata::get_endpoint_for_host_id(UUID host_id) {
auto beg = _endpoint_to_host_id_map.cbegin();
auto end = _endpoint_to_host_id_map.cend();
auto it = std::find_if(beg, end, [host_id] (auto x) {
return x.second == host_id;
});
assert(it != end);
return (*it).first;
if (it == end) {
return {};
} else {
return (*it).first;
}
}
const std::unordered_map<inet_address, utils::UUID>& token_metadata::get_endpoint_to_host_id_map_for_reading() const{

2
locator/token_metadata.hh
View File

@@ -420,7 +420,7 @@ public:
UUID get_host_id(inet_address endpoint);
/** Return the end-point for a unique host ID */
inet_address get_endpoint_for_host_id(UUID host_id);
std::experimental::optional<inet_address> get_endpoint_for_host_id(UUID host_id);
/** @return a copy of the endpoint-to-id map for read-only operations */
const std::unordered_map<inet_address, utils::UUID>& get_endpoint_to_host_id_map_for_reading() const;