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Add clear_resolved_cache implementation#893

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Merged
deanberris merged 3 commits intocpp-netlib:masterfromgns333:master
Jan 27, 2021
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10 changes: 8 additions & 2 deletionsboost/network/protocol/http/policies/async_resolver.hpp
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Original file line numberDiff line numberDiff line change
Expand Up@@ -36,18 +36,21 @@ struct async_resolver : std::enable_shared_from_this<async_resolver<Tag> > {
typedef std::function<void(resolver_type &, string_type, std::uint16_t,
resolve_completion_function)> resolve_function;

void clear_resolved_cache() { clear_cache_.store(true); }

protected:
bool cache_resolved_;
std::atomic<bool> clear_cache_;
endpoint_cache endpoint_cache_;
std::shared_ptr<boost::asio::io_service> service_;
std::shared_ptr<boost::asio::io_service::strand> resolver_strand_;

explicit async_resolver(bool cache_resolved)
: cache_resolved_(cache_resolved), endpoint_cache_() {}
: cache_resolved_(cache_resolved),clear_cache_(false),endpoint_cache_() {}

void resolve(resolver_type &resolver_, string_type const &host,
std::uint16_t port, resolve_completion_function once_resolved) {
if (cache_resolved_) {
if (cache_resolved_ && !clear_cache_.load()) {
typename endpoint_cache::iterator iter =
endpoint_cache_.find(boost::to_lower_copy(host));
if (iter != endpoint_cache_.end()) {
Expand All@@ -74,6 +77,9 @@ struct async_resolver : std::enable_shared_from_this<async_resolver<Tag> > {
typename endpoint_cache::iterator iter;
bool inserted = false;
if (!ec && cache_resolved_) {
if (clear_cache_.exchange(false)) {
endpoint_cache_.clear();
}
std::tie(iter, inserted) = endpoint_cache_.insert(std::make_pair(
host, std::make_pair(endpoint_iterator, resolver_iterator())));
once_resolved(ec, iter->second);
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9 changes: 8 additions & 1 deletionboost/network/protocol/http/policies/sync_resolver.hpp
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Original file line numberDiff line numberDiff line change
Expand Up@@ -27,19 +27,26 @@ struct sync_resolver {
typedef std::pair<resolver_iterator, resolver_iterator>
resolver_iterator_pair;

void clear_resolved_cache() { clear_cache_.store(true); }

protected:
typedef typename string<Tag>::type string_type;
typedef std::unordered_map<string_type, resolver_iterator_pair>
resolved_cache;
resolved_cache endpoint_cache_;
bool cache_resolved_;
std::atomic<bool> clear_cache_;

explicit sync_resolver(bool cache_resolved) : cache_resolved_(cache_resolved) {}
explicit sync_resolver(bool cache_resolved)
: cache_resolved_(cache_resolved), clear_cache_(false) {}

resolver_iterator_pair resolve(resolver_type& resolver_,
string_type /*unused*/const& hostname,
string_type const& port) {
if (cache_resolved_) {
if (clear_cache_.exchange(false)) {
endpoint_cache_.clear();
}
typename resolved_cache::iterator cached_iterator =
endpoint_cache_.find(hostname);
if (cached_iterator == endpoint_cache_.end()) {
Expand Down
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