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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "replymerger.h"
#include "documentprotocol.h"
#include <vespa/documentapi/messagebus/messages/removedocumentreply.h>
#include <vespa/documentapi/messagebus/messages/updatedocumentreply.h>
#include <vespa/documentapi/messagebus/messages/getdocumentreply.h>
#include <vespa/messagebus/emptyreply.h>
#include <cassert>
namespace documentapi {
ReplyMerger::ReplyMerger()
: _error(),
_ignored(),
_successReply(nullptr),
_successIndex(0)
{
}
ReplyMerger::~ReplyMerger() = default;
ReplyMerger::Result::Result(uint32_t successIdx, std::unique_ptr<mbus::Reply> generatedReply)
: _generatedReply(std::move(generatedReply)),
_successIdx(successIdx)
{
}
bool
ReplyMerger::Result::hasGeneratedReply() const
{
return (bool)_generatedReply;
}
bool
ReplyMerger::Result::isSuccessful() const
{
return !hasGeneratedReply();
}
std::unique_ptr<mbus::Reply>
ReplyMerger::Result::releaseGeneratedReply()
{
assert(hasGeneratedReply());
return std::move(_generatedReply);
}
uint32_t
ReplyMerger::Result::getSuccessfulReplyIndex() const
{
assert(!hasGeneratedReply());
return _successIdx;
}
void
ReplyMerger::merge(uint32_t idx, const mbus::Reply& r)
{
if (r.hasErrors()) {
mergeAllReplyErrors(r);
} else {
updateStateWithSuccessfulReply(idx, r);
}
}
bool
ReplyMerger::resourceWasFound(const mbus::Reply& r)
{
switch (r.getType()) {
case DocumentProtocol::REPLY_REMOVEDOCUMENT:
return static_cast<const RemoveDocumentReply&>(r).wasFound();
case DocumentProtocol::REPLY_UPDATEDOCUMENT:
return static_cast<const UpdateDocumentReply&>(r).wasFound();
case DocumentProtocol::REPLY_GETDOCUMENT:
return static_cast<const GetDocumentReply&>(r).getLastModified() != 0;
default:
return false;
}
}
// Precondition: _successReply != 0
bool
ReplyMerger::replyIsBetterThanCurrent(const mbus::Reply& r) const
{
return resourceWasFound(r) && !resourceWasFound(*_successReply);
}
void
ReplyMerger::setCurrentBestReply(uint32_t idx, const mbus::Reply& r)
{
_successIndex = idx;
_successReply = &r;
}
void
ReplyMerger::updateStateWithSuccessfulReply(uint32_t idx, const mbus::Reply& r)
{
if (!_successReply || replyIsBetterThanCurrent(r)) {
setCurrentBestReply(idx, r);
}
}
void
ReplyMerger::mergeAllReplyErrors(const mbus::Reply& r)
{
if (handleReplyWithOnlyIgnoredErrors(r)) {
return;
}
if ( ! _error ) {
_error = std::make_unique<mbus::EmptyReply>();
}
for (uint32_t i = 0; i < r.getNumErrors(); ++i) {
_error->addError(r.getError(i));
}
}
bool
ReplyMerger::handleReplyWithOnlyIgnoredErrors(const mbus::Reply& r)
{
if (DocumentProtocol::hasOnlyErrorsOfType(r, DocumentProtocol::ERROR_MESSAGE_IGNORED)) {
if ( ! _ignored) {
_ignored = std::make_unique<mbus::EmptyReply>();
}
_ignored->addError(r.getError(0));
return true;
}
return false;
}
bool
ReplyMerger::shouldReturnErrorReply() const
{
if (_error) {
return true;
}
return (_ignored.get() && !_successReply);
}
std::unique_ptr<mbus::Reply>
ReplyMerger::releaseGeneratedErrorReply()
{
if (_error) {
return std::move(_error);
} else {
assert(_ignored.get());
return std::move(_ignored);
}
}
bool
ReplyMerger::successfullyMergedAtLeastOneReply() const
{
return (_successReply != nullptr);
}
ReplyMerger::Result
ReplyMerger::createEmptyReplyResult()
{
return Result(0u, std::make_unique<mbus::EmptyReply>());
}
ReplyMerger::Result
ReplyMerger::mergedReply()
{
std::unique_ptr<mbus::Reply> generated;
if (shouldReturnErrorReply()) {
generated = releaseGeneratedErrorReply();
} else if (!successfullyMergedAtLeastOneReply()) {
return createEmptyReplyResult();
}
return Result(_successIndex, std::move(generated));
}
} // documentapi
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