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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "simpleprotocol.h"
#include "simplemessage.h"
#include "simplereply.h"
#include <vespa/messagebus/emptyreply.h>
#include <vespa/messagebus/routing/routingcontext.h>
namespace mbus {
const string SimpleProtocol::NAME("Simple");
const uint32_t SimpleProtocol::MESSAGE(1);
const uint32_t SimpleProtocol::REPLY(2);
class AllPolicy : public IRoutingPolicy {
public:
void select(RoutingContext &ctx) override {
std::vector<Route> recipients;
ctx.getMatchedRecipients(recipients);
ctx.addChildren(recipients);
}
void merge(RoutingContext &ctx) override {
SimpleProtocol::simpleMerge(ctx);
}
};
class AllPolicyFactory : public SimpleProtocol::IPolicyFactory {
public:
IRoutingPolicy::UP create(const string &) override {
return IRoutingPolicy::UP(new AllPolicy());
}
};
class HashPolicy : public IRoutingPolicy {
public:
void select(RoutingContext &ctx) override {
std::vector<Route> recipients;
ctx.getMatchedRecipients(recipients);
if (!recipients.empty()) {
int i = static_cast<const SimpleMessage&>(ctx.getMessage()).getHash();
ctx.addChild(recipients[std::abs(i) % recipients.size()]);
}
}
void merge(RoutingContext &ctx) override {
SimpleProtocol::simpleMerge(ctx);
}
};
class HashPolicyFactory : public SimpleProtocol::IPolicyFactory {
public:
IRoutingPolicy::UP create(const string &) override {
return IRoutingPolicy::UP(new HashPolicy());
}
};
SimpleProtocol::SimpleProtocol() :
_policies()
{
addPolicyFactory("All", IPolicyFactory::SP(new AllPolicyFactory));
addPolicyFactory("Hash", IPolicyFactory::SP(new HashPolicyFactory));
}
SimpleProtocol::~SimpleProtocol()
{
// empty
}
void
SimpleProtocol::addPolicyFactory(const string &name,
IPolicyFactory::SP factory)
{
_policies.insert(FactoryMap::value_type(name, factory));
}
const string &
SimpleProtocol::getName() const
{
return NAME;
}
IRoutingPolicy::UP
SimpleProtocol::createPolicy(const string &name,
const string ¶m) const
{
FactoryMap::const_iterator it = _policies.find(name);
if (it != _policies.end()) {
return it->second->create(param);
}
return IRoutingPolicy::UP();
}
Blob
SimpleProtocol::encode(const vespalib::Version &version, const Routable &routable) const
{
(void)version;
if (routable.getType() == MESSAGE) {
string str = "M";
str.append(static_cast<const SimpleMessage&>(routable).getValue());
Blob ret(str.size());
memcpy(ret.data(), str.data(), str.size());
return ret;
} else if (routable.getType() == REPLY) {
string str = "R";
str.append(static_cast<const SimpleReply&>(routable).getValue());
Blob ret(str.size());
memcpy(ret.data(), str.data(), str.size());
return ret;
} else {
return Blob(0);
}
}
Routable::UP
SimpleProtocol::decode(const vespalib::Version &version, BlobRef data) const
{
(void)version;
const char *d = data.data();
uint32_t s = data.size();
if (s < 1) {
return Routable::UP(); // too short
}
string str(d + 1, s - 1);
if (*d == 'M') {
return Routable::UP(new SimpleMessage(str));
} else if (*d == 'R') {
return Routable::UP(new SimpleReply(str));
} else {
return Routable::UP(); // unknown type
}
}
void
SimpleProtocol::simpleMerge(RoutingContext &ctx)
{
Reply::UP ret(new EmptyReply());
for (RoutingNodeIterator it = ctx.getChildIterator();
it.isValid(); it.next())
{
const Reply &reply = it.getReplyRef();
for (uint32_t i = 0; i < reply.getNumErrors(); ++i) {
ret->addError(reply.getError(i));
}
}
ctx.setReply(std::move(ret));
}
} // namespace mbus
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