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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "roundrobinpolicy.h"
#include <vespa/documentapi/messagebus/documentprotocol.h>
#include <vespa/messagebus/emptyreply.h>
#include <vespa/messagebus/error.h>
namespace documentapi {
RoundRobinPolicy::CacheEntry::CacheEntry() :
_offset(0),
_generation(),
_recipients()
{}
RoundRobinPolicy::RoundRobinPolicy(const string &) :
_lock(),
_cache()
{}
RoundRobinPolicy::~RoundRobinPolicy() = default;
void
RoundRobinPolicy::select(mbus::RoutingContext &ctx)
{
mbus::Hop hop = getRecipient(ctx);
if (hop.hasDirectives()) {
mbus::Route route = ctx.getRoute();
route.setHop(0, hop);
ctx.addChild(route);
} else {
mbus::EmptyReply::UP reply(new mbus::EmptyReply());
reply->addError(mbus::Error(mbus::ErrorCode::NO_ADDRESS_FOR_SERVICE,
"None of the configured recipients are currently available."));
ctx.setReply(std::move(reply));
}
}
void
RoundRobinPolicy::merge(mbus::RoutingContext &context)
{
DocumentProtocol::merge(context);
}
string
RoundRobinPolicy::getCacheKey(const mbus::RoutingContext &ctx) const
{
string ret;
for (uint32_t i = 0; i < ctx.getNumRecipients(); ++i) {
ret.append(ctx.getRecipient(i).getHop(0).toString());
ret.append(" ");
}
return ret;
}
mbus::Hop
RoundRobinPolicy::getRecipient(mbus::RoutingContext &ctx)
{
std::lock_guard guard(_lock);
CacheEntry &entry = update(ctx);
if (entry._recipients.empty()) {
return mbus::Hop();
}
if (++entry._offset >= entry._recipients.size()) {
entry._offset = 0;
}
return entry._recipients[entry._offset];
}
RoundRobinPolicy::CacheEntry &
RoundRobinPolicy::update(mbus::RoutingContext &ctx)
{
uint32_t upd = ctx.getMirror().updates();
CacheEntry &entry = _cache.insert(std::map<string, CacheEntry>::value_type(getCacheKey(ctx), CacheEntry())).first->second;
if (entry._generation != upd) {
entry._generation = upd;
entry._recipients.clear();
for (uint32_t i = 0; i < ctx.getNumRecipients(); ++i)
{
slobrok::api::IMirrorAPI::SpecList entries = ctx.getMirror().lookup(ctx.getRecipient(i).getHop(0).toString());
for (slobrok::api::IMirrorAPI::SpecList::iterator it = entries.begin();
it != entries.end(); ++it)
{
entry._recipients.push_back(mbus::Hop::parse(it->first));
}
}
}
return entry;
}
}
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