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foundationdb/fdbserver/LogSystemPeekCursor.actor.cpp

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/*
* LogSystemPeekCursor.actor.cpp
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "LogSystem.h"
#include "fdbrpc/FailureMonitor.h"
#include "Knobs.h"
ILogSystem::ServerPeekCursor::ServerPeekCursor( Reference<AsyncVar<OptionalInterface<TLogInterface>>> const& interf, Tag tag, Version begin, Version end, bool returnIfBlocked, bool parallelGetMore )
: interf(interf), tag(tag), messageVersion(begin), end(end), hasMsg(false), rd(results.arena, results.messages, Unversioned()), randomID(g_random->randomUniqueID()), poppedVersion(0), returnIfBlocked(returnIfBlocked), sequence(0), parallelGetMore(parallelGetMore) {
this->results.maxKnownVersion = 0;
//TraceEvent("SPC_starting", randomID).detail("tag", printable(tag)).detail("begin", begin).detail("end", end);
}
ILogSystem::ServerPeekCursor::ServerPeekCursor( TLogPeekReply const& results, LogMessageVersion const& messageVersion, LogMessageVersion const& end, int32_t messageLength, bool hasMsg, Version poppedVersion )
: results(results), rd(results.arena, results.messages, Unversioned()), messageVersion(messageVersion), end(end), messageLength(messageLength), hasMsg(hasMsg), randomID(g_random->randomUniqueID()), poppedVersion(poppedVersion), returnIfBlocked(false), sequence(0), parallelGetMore(false)
{
//TraceEvent("SPC_clone", randomID);
this->results.maxKnownVersion = 0;
if(hasMsg)
nextMessage();
advanceTo(messageVersion);
}
Reference<ILogSystem::IPeekCursor> ILogSystem::ServerPeekCursor::cloneNoMore() {
return Reference<ILogSystem::ServerPeekCursor>( new ILogSystem::ServerPeekCursor( results, messageVersion, end, messageLength, hasMsg, poppedVersion ) );
}
void ILogSystem::ServerPeekCursor::setProtocolVersion( uint64_t version ) {
rd.setProtocolVersion(version);
}
Arena& ILogSystem::ServerPeekCursor::arena() { return results.arena; }
ArenaReader* ILogSystem::ServerPeekCursor::reader() {
return &rd;
}
bool ILogSystem::ServerPeekCursor::hasMessage() {
//TraceEvent("SPC_hasMessage", randomID).detail("hasMsg", hasMsg);
return hasMsg;
}
void ILogSystem::ServerPeekCursor::nextMessage() {
//TraceEvent("SPC_nextMessage", randomID).detail("messageVersion", messageVersion.toString());
ASSERT(hasMsg);
if (rd.empty()) {
messageVersion.reset(std::min(results.end, end.version));
hasMsg = false;
return;
}
if (*(int32_t*)rd.peekBytes(4) == -1) {
// A version
int32_t dummy;
Version ver;
rd >> dummy >> ver;
//TraceEvent("SPC_process_Seq", randomID).detail("messageVersion", messageVersion.toString()).detail("ver", ver);
//ASSERT( ver >= messageVersion.version );
messageVersion.reset(ver);
if( messageVersion >= end ) {
messageVersion = end;
hasMsg = false;
return;
}
ASSERT(!rd.empty());
}
uint16_t tagCount;
rd >> messageLength >> messageVersion.sub >> tagCount;
tags.resize(tagCount);
for(int i = 0; i < tagCount; i++) {
rd >> tags[i];
}
messageLength -= (sizeof(messageVersion.sub) + sizeof(tagCount) +tagCount*sizeof(Tag));
hasMsg = true;
//TraceEvent("SPC_nextMessageB", randomID).detail("messageVersion", messageVersion.toString());
}
StringRef ILogSystem::ServerPeekCursor::getMessage() {
//TraceEvent("SPC_getMessage", randomID);
return StringRef( (uint8_t const*)rd.readBytes(messageLength), messageLength);
}
std::vector<Tag> ILogSystem::ServerPeekCursor::getTags() {
return tags;
}
void ILogSystem::ServerPeekCursor::advanceTo(LogMessageVersion n) {
//TraceEvent("SPC_advanceTo", randomID).detail("n", n.toString());
while( messageVersion < n && hasMessage() ) {
getMessage();
nextMessage();
}
if( hasMessage() )
return;
//if( more.isValid() && !more.isReady() ) more.cancel();
if( messageVersion < n ) {
messageVersion = n;
}
}
ACTOR Future<Void> serverPeekParallelGetMore( ILogSystem::ServerPeekCursor* self ) {
if( !self->interf || self->messageVersion >= self->end ) {
Void _ = wait( Future<Void>(Never()));
throw internal_error();
}
loop {
try {
while(self->futureResults.size() < SERVER_KNOBS->PARALLEL_GET_MORE_REQUESTS && self->interf->get().present()) {
self->futureResults.push_back( brokenPromiseToNever( self->interf->get().interf().peekMessages.getReply(TLogPeekRequest(self->messageVersion.version,self->tag,self->returnIfBlocked, std::make_pair(self->randomID, self->sequence++)), TaskTLogPeekReply) ) );
}
choose {
when( TLogPeekReply res = wait( self->interf->get().present() ? self->futureResults.front() : Never() ) ) {
self->futureResults.pop_front();
self->results = res;
if(res.popped.present())
self->poppedVersion = std::min( std::max(self->poppedVersion, res.popped.get()), self->end.version );
self->rd = ArenaReader( self->results.arena, self->results.messages, Unversioned() );
LogMessageVersion skipSeq = self->messageVersion;
self->hasMsg = true;
self->nextMessage();
self->advanceTo(skipSeq);
//TraceEvent("SPC_getMoreB", self->randomID).detail("has", self->hasMessage()).detail("end", res.end).detail("popped", res.popped.present() ? res.popped.get() : 0);
return Void();
}
when( Void _ = wait( self->interf->onChange() ) ) {
self->sequence = 0;
self->futureResults.clear();
}
}
} catch( Error &e ) {
if(e.code() == error_code_end_of_stream) {
self->end.reset( self->messageVersion.version );
return Void();
} else if(e.code() == error_code_timed_out) {
TraceEvent("PeekCursorTimedOut", self->randomID);
self->randomID = g_random->randomUniqueID();
self->sequence = 0;
self->futureResults.clear();
} else {
throw e;
}
}
}
}
ACTOR Future<Void> serverPeekGetMore( ILogSystem::ServerPeekCursor* self ) {
if( !self->interf || self->messageVersion >= self->end ) {
Void _ = wait( Future<Void>(Never()));
throw internal_error();
}
try {
loop {
choose {
when( TLogPeekReply res = wait( self->interf->get().present() ?
brokenPromiseToNever( self->interf->get().interf().peekMessages.getReply(TLogPeekRequest(self->messageVersion.version,self->tag,self->returnIfBlocked), TaskTLogPeekReply) ) : Never() ) ) {
self->results = res;
if(res.popped.present())
self->poppedVersion = std::min( std::max(self->poppedVersion, res.popped.get()), self->end.version );
self->rd = ArenaReader( self->results.arena, self->results.messages, Unversioned() );
LogMessageVersion skipSeq = self->messageVersion;
self->hasMsg = true;
self->nextMessage();
self->advanceTo(skipSeq);
//TraceEvent("SPC_getMoreB", self->randomID).detail("has", self->hasMessage()).detail("end", res.end).detail("popped", res.popped.present() ? res.popped.get() : 0);
return Void();
}
when( Void _ = wait( self->interf->onChange() ) ) {}
}
}
} catch( Error &e ) {
if(e.code() == error_code_end_of_stream) {
self->end.reset( self->messageVersion.version );
return Void();
}
throw e;
}
}
Future<Void> ILogSystem::ServerPeekCursor::getMore() {
//TraceEvent("SPC_getMore", randomID).detail("hasMessage", hasMessage()).detail("more", !more.isValid() || more.isReady()).detail("messageVersion", messageVersion.toString()).detail("end", end.toString());
if( hasMessage() )
return Void();
if( !more.isValid() || more.isReady() ) {
more = parallelGetMore ? serverPeekParallelGetMore(this) : serverPeekGetMore(this);
}
return more;
}
ACTOR Future<Void> serverPeekOnFailed( ILogSystem::ServerPeekCursor* self ) {
loop {
choose {
when( Void _ = wait( self->interf->get().present() ? IFailureMonitor::failureMonitor().onDisconnectOrFailure( self->interf->get().interf().peekMessages.getEndpoint() ) : Never() ) ) { return Void(); }
when( Void _ = wait( self->interf->onChange() ) ) {}
}
}
}
Future<Void> ILogSystem::ServerPeekCursor::onFailed() {
return serverPeekOnFailed(this);
}
bool ILogSystem::ServerPeekCursor::isActive() {
if( !interf->get().present() )
return false;
if( messageVersion >= end )
return false;
return IFailureMonitor::failureMonitor().getState( interf->get().interf().peekMessages.getEndpoint() ).isAvailable();
}
LogMessageVersion ILogSystem::ServerPeekCursor::version() { return messageVersion; } // Call only after nextMessage(). The sequence of the current message, or results.end if nextMessage() has returned false.
Version ILogSystem::ServerPeekCursor::popped() { return poppedVersion; }
ILogSystem::MergedPeekCursor::MergedPeekCursor( std::vector<Reference<AsyncVar<OptionalInterface<TLogInterface>>>> const& logServers, int bestServer, int readQuorum, Tag tag, Version begin, Version end, bool parallelGetMore )
: bestServer(bestServer), readQuorum(readQuorum), tag(tag), currentCursor(0), hasNextMessage(false), messageVersion(begin), randomID(g_random->randomUniqueID()) {
for( int i = 0; i < logServers.size(); i++ ) {
Reference<ILogSystem::ServerPeekCursor> cursor( new ILogSystem::ServerPeekCursor( logServers[i], tag, begin, end, bestServer >= 0, parallelGetMore ) );
//TraceEvent("MPC_starting", randomID).detail("cursor", cursor->randomID).detail("end", end);
serverCursors.push_back( cursor );
}
}
ILogSystem::MergedPeekCursor::MergedPeekCursor( vector< Reference<ILogSystem::IPeekCursor> > const& serverCursors, LogMessageVersion const& messageVersion, int bestServer, int readQuorum, Optional<LogMessageVersion> nextVersion )
: serverCursors(serverCursors), bestServer(bestServer), readQuorum(readQuorum), currentCursor(0), hasNextMessage(false), messageVersion(messageVersion), nextVersion(nextVersion), randomID(g_random->randomUniqueID()) {
calcHasMessage();
}
Reference<ILogSystem::IPeekCursor> ILogSystem::MergedPeekCursor::cloneNoMore() {
vector< Reference<ILogSystem::IPeekCursor> > cursors;
for( auto it : serverCursors ) {
cursors.push_back(it->cloneNoMore());
}
return Reference<ILogSystem::MergedPeekCursor>( new ILogSystem::MergedPeekCursor( cursors, messageVersion, bestServer, readQuorum, nextVersion ) );
}
void ILogSystem::MergedPeekCursor::setProtocolVersion( uint64_t version ) {
for( auto it : serverCursors )
if( it->hasMessage() )
it->setProtocolVersion( version );
}
Arena& ILogSystem::MergedPeekCursor::arena() { return serverCursors[currentCursor]->arena(); }
ArenaReader* ILogSystem::MergedPeekCursor::reader() { return serverCursors[currentCursor]->reader(); }
void ILogSystem::MergedPeekCursor::calcHasMessage() {
if(bestServer >= 0) {
if(nextVersion.present()) serverCursors[bestServer]->advanceTo( nextVersion.get() );
if( serverCursors[bestServer]->hasMessage() ) {
messageVersion = serverCursors[bestServer]->version();
currentCursor = bestServer;
hasNextMessage = true;
for (auto& c : serverCursors)
c->advanceTo(messageVersion);
return;
}
auto bestVersion = serverCursors[bestServer]->version();
for (auto& c : serverCursors)
c->advanceTo(bestVersion);
}
hasNextMessage = false;
updateMessage();
}
void ILogSystem::MergedPeekCursor::updateMessage() {
loop {
bool advancedPast = false;
sortedVersions.clear();
for(int i = 0; i < serverCursors.size(); i++) {
auto& serverCursor = serverCursors[i];
if (nextVersion.present()) serverCursor->advanceTo(nextVersion.get());
sortedVersions.push_back(std::pair<LogMessageVersion, int>(serverCursor->version(), i));
}
std::nth_element(sortedVersions.begin(), sortedVersions.end()-readQuorum, sortedVersions.end());
messageVersion = sortedVersions[sortedVersions.size()-readQuorum].first;
for(int i = 0; i < serverCursors.size(); i++) {
auto& c = serverCursors[i];
auto start = c->version();
c->advanceTo(messageVersion);
if( start < messageVersion && messageVersion < c->version() ) {
advancedPast = true;
TEST(true); //Merge peek cursor advanced past desired sequence
}
}
if(!advancedPast)
break;
}
for(int i = 0; i < serverCursors.size(); i++) {
auto& c = serverCursors[i];
ASSERT_WE_THINK( !c->hasMessage() || c->version() >= messageVersion ); // Seems like the loop above makes this unconditionally true
if (c->version() == messageVersion && c->hasMessage()) {
hasNextMessage = true;
currentCursor = i;
break;
}
}
}
bool ILogSystem::MergedPeekCursor::hasMessage() {
return hasNextMessage;
}
void ILogSystem::MergedPeekCursor::nextMessage() {
nextVersion = version();
nextVersion.get().sub++;
serverCursors[currentCursor]->nextMessage();
calcHasMessage();
ASSERT(hasMessage() || !version().sub);
}
StringRef ILogSystem::MergedPeekCursor::getMessage() { return serverCursors[currentCursor]->getMessage(); }
std::vector<Tag> ILogSystem::MergedPeekCursor::getTags() {
return serverCursors[currentCursor]->getTags();
}
void ILogSystem::MergedPeekCursor::advanceTo(LogMessageVersion n) {
for (auto& c : serverCursors)
c->advanceTo(n);
calcHasMessage();
}
ACTOR Future<Void> mergedPeekGetMore(ILogSystem::MergedPeekCursor* self, LogMessageVersion startVersion) {
loop {
//TraceEvent("MPC_getMoreA", self->randomID).detail("start", startVersion.toString());
if(self->bestServer >= 0 && self->serverCursors[self->bestServer]->isActive()) {
ASSERT(!self->serverCursors[self->bestServer]->hasMessage());
Void _ = wait( self->serverCursors[self->bestServer]->getMore() || self->serverCursors[self->bestServer]->onFailed() );
} else {
vector<Future<Void>> q;
for (auto& c : self->serverCursors)
if (!c->hasMessage())
q.push_back(c->getMore());
Void _ = wait(quorum(q, 1));
}
self->calcHasMessage();
//TraceEvent("MPC_getMoreB", self->randomID).detail("hasMessage", self->hasMessage()).detail("start", startVersion.toString()).detail("seq", self->version().toString());
if (self->hasMessage() || self->version() > startVersion)
return Void();
}
}
Future<Void> ILogSystem::MergedPeekCursor::getMore() {
if(!serverCursors.size())
return Never();
auto startVersion = version();
calcHasMessage();
if( hasMessage() )
return Void();
if (nextVersion.present())
advanceTo(nextVersion.get());
ASSERT(!hasMessage());
if (version() > startVersion)
return Void();
return mergedPeekGetMore(this, startVersion);
}
Future<Void> ILogSystem::MergedPeekCursor::onFailed() {
ASSERT(false);
return Never();
}
bool ILogSystem::MergedPeekCursor::isActive() {
ASSERT(false);
return false;
}
LogMessageVersion ILogSystem::MergedPeekCursor::version() { return messageVersion; }
Version ILogSystem::MergedPeekCursor::popped() {
Version poppedVersion = 0;
for (auto& c : serverCursors)
poppedVersion = std::max(poppedVersion, c->popped());
return poppedVersion;
}
ILogSystem::SetPeekCursor::SetPeekCursor( std::vector<Reference<LogSet>> const& logSets, int bestSet, int bestServer, Tag tag, Version begin, Version end, bool parallelGetMore )
: logSets(logSets), bestSet(bestSet), bestServer(bestServer), tag(tag), currentCursor(0), currentSet(bestSet), hasNextMessage(false), messageVersion(begin), useBestSet(true), randomID(g_random->randomUniqueID()) {
serverCursors.resize(logSets.size());
int maxServers = 0;
for( int i = 0; i < logSets.size(); i++ ) {
for( int j = 0; j < logSets[i]->logServers.size(); j++) {
Reference<ILogSystem::ServerPeekCursor> cursor( new ILogSystem::ServerPeekCursor( logSets[i]->logServers[j], tag, begin, end, true, parallelGetMore ) );
serverCursors[i].push_back( cursor );
}
maxServers = std::max<int>(maxServers, serverCursors[i].size());
}
sortedVersions.resize(maxServers);
}
Reference<ILogSystem::IPeekCursor> ILogSystem::SetPeekCursor::cloneNoMore() {
ASSERT(false); //not implemented
throw internal_error();
}
void ILogSystem::SetPeekCursor::setProtocolVersion( uint64_t version ) {
for( auto& cursors : serverCursors ) {
for( auto& it : cursors ) {
if( it->hasMessage() ) {
it->setProtocolVersion( version );
}
}
}
}
Arena& ILogSystem::SetPeekCursor::arena() { return serverCursors[currentSet][currentCursor]->arena(); }
ArenaReader* ILogSystem::SetPeekCursor::reader() { return serverCursors[currentSet][currentCursor]->reader(); }
void ILogSystem::SetPeekCursor::calcHasMessage() {
if(nextVersion.present()) serverCursors[bestSet][bestServer]->advanceTo( nextVersion.get() );
if( serverCursors[bestSet][bestServer]->hasMessage() ) {
messageVersion = serverCursors[bestSet][bestServer]->version();
currentSet = bestSet;
currentCursor = bestServer;
hasNextMessage = true;
for (auto& cursors : serverCursors) {
for(auto& c : cursors) {
c->advanceTo(messageVersion);
}
}
return;
}
auto bestVersion = serverCursors[bestSet][bestServer]->version();
for (auto& cursors : serverCursors) {
for (auto& c : cursors) {
c->advanceTo(bestVersion);
}
}
if(useBestSet) {
hasNextMessage = false;
updateMessage(bestSet, false); // Use Quorum logic
if(!hasNextMessage) {
updateMessage(bestSet, true);
}
} else {
for(int i = 0; i < logSets.size() && !hasNextMessage; i++) {
if(i != bestSet) {
updateMessage(i, false); // Use Quorum logic
}
}
for(int i = 0; i < logSets.size() && !hasNextMessage; i++) {
if(i != bestSet) {
updateMessage(i, true);
}
}
}
}
void ILogSystem::SetPeekCursor::updateMessage(int logIdx, bool usePolicy) {
loop {
bool advancedPast = false;
sortedVersions.clear();
for(int i = 0; i < serverCursors[logIdx].size(); i++) {
auto& serverCursor = serverCursors[logIdx][i];
if (nextVersion.present()) serverCursor->advanceTo(nextVersion.get());
sortedVersions.push_back(std::pair<LogMessageVersion, int>(serverCursor->version(), i));
}
if(usePolicy) {
localityGroup.clear();
std::sort(sortedVersions.begin(), sortedVersions.end());
for(auto sortedVersion : sortedVersions) {
auto& locality = logSets[logIdx]->tLogLocalities[sortedVersion.second];
localityGroup.add(locality);
if( localityGroup.size() >= logSets[logIdx]->tLogReplicationFactor && localityGroup.validate(logSets[logIdx]->tLogPolicy) ) {
messageVersion = sortedVersion.first;
break;
}
}
} else {
//(int)oldLogData[i].logServers.size() + 1 - oldLogData[i].tLogReplicationFactor
std::nth_element(sortedVersions.begin(), sortedVersions.end()-(logSets[logIdx]->logServers.size()+1-logSets[logIdx]->tLogReplicationFactor), sortedVersions.end());
messageVersion = sortedVersions[sortedVersions.size()-(logSets[logIdx]->logServers.size()+1-logSets[logIdx]->tLogReplicationFactor)].first;
}
for(int i = 0; i < serverCursors[logIdx].size(); i++) {
auto& c = serverCursors[logIdx][i];
auto start = c->version();
c->advanceTo(messageVersion);
if( start < messageVersion && messageVersion < c->version() ) {
advancedPast = true;
TEST(true); //Merge peek cursor advanced past desired sequence
}
}
if(!advancedPast)
break;
}
for(int i = 0; i < serverCursors[logIdx].size(); i++) {
auto& c = serverCursors[logIdx][i];
ASSERT_WE_THINK( !c->hasMessage() || c->version() >= messageVersion ); // Seems like the loop above makes this unconditionally true
if (c->version() == messageVersion && c->hasMessage()) {
hasNextMessage = true;
currentSet = logIdx;
currentCursor = i;
break;
}
}
}
bool ILogSystem::SetPeekCursor::hasMessage() {
return hasNextMessage;
}
void ILogSystem::SetPeekCursor::nextMessage() {
nextVersion = version();
nextVersion.get().sub++;
serverCursors[currentSet][currentCursor]->nextMessage();
calcHasMessage();
ASSERT(hasMessage() || !version().sub);
}
StringRef ILogSystem::SetPeekCursor::getMessage() { return serverCursors[currentSet][currentCursor]->getMessage(); }
std::vector<Tag> ILogSystem::SetPeekCursor::getTags() {
return serverCursors[currentSet][currentCursor]->getTags();
}
void ILogSystem::SetPeekCursor::advanceTo(LogMessageVersion n) {
for( auto& cursors : serverCursors ) {
for (auto& c : cursors) {
c->advanceTo(n);
}
}
calcHasMessage();
}
ACTOR Future<Void> setPeekGetMore(ILogSystem::SetPeekCursor* self, LogMessageVersion startVersion) {
loop {
//TraceEvent("LPC_getMoreA", self->randomID).detail("start", startVersion.toString());
if(self->bestServer >= 0 && self->bestSet >= 0 && self->serverCursors[self->bestSet][self->bestServer]->isActive()) {
ASSERT(!self->serverCursors[self->bestSet][self->bestServer]->hasMessage());
Void _ = wait( self->serverCursors[self->bestSet][self->bestServer]->getMore() || self->serverCursors[self->bestSet][self->bestServer]->onFailed() );
self->useBestSet = true;
} else {
bool bestSetValid = self->bestSet >= 0;
if(bestSetValid) {
self->localityGroup.clear();
for( int i = 0; i < self->serverCursors[self->bestSet].size(); i++) {
if(!self->serverCursors[self->bestSet][i]->isActive()) {
self->localityGroup.add(self->logSets[self->bestSet]->tLogLocalities[i]);
}
}
bestSetValid = self->localityGroup.size() < self->logSets[self->bestSet]->tLogReplicationFactor || !self->localityGroup.validate(self->logSets[self->bestSet]->tLogPolicy);
}
if(bestSetValid) {
vector<Future<Void>> q;
for (auto& c : self->serverCursors[self->bestSet]) {
if (!c->hasMessage()) {
q.push_back(c->getMore());
}
}
Void _ = wait(quorum(q, 1));
self->useBestSet = true;
} else {
//FIXME: this will peeking way too many cursors when satellites exist, and does not need to peek bestSet cursors since we cannot get anymore data from them
vector<Future<Void>> q;
for(auto& cursors : self->serverCursors) {
for (auto& c :cursors) {
if (!c->hasMessage()) {
q.push_back(c->getMore());
}
}
}
Void _ = wait(quorum(q, 1));
self->useBestSet = false;
}
}
self->calcHasMessage();
//TraceEvent("LPC_getMoreB", self->randomID).detail("hasMessage", self->hasMessage()).detail("start", startVersion.toString()).detail("seq", self->version().toString());
if (self->hasMessage() || self->version() > startVersion)
return Void();
}
}
Future<Void> ILogSystem::SetPeekCursor::getMore() {
auto startVersion = version();
calcHasMessage();
if( hasMessage() )
return Void();
if (nextVersion.present())
advanceTo(nextVersion.get());
ASSERT(!hasMessage());
if (version() > startVersion)
return Void();
return setPeekGetMore(this, startVersion);
}
Future<Void> ILogSystem::SetPeekCursor::onFailed() {
ASSERT(false);
return Never();
}
bool ILogSystem::SetPeekCursor::isActive() {
ASSERT(false);
return false;
}
LogMessageVersion ILogSystem::SetPeekCursor::version() { return messageVersion; }
Version ILogSystem::SetPeekCursor::popped() {
Version poppedVersion = 0;
for (auto& cursors : serverCursors) {
for(auto& c : cursors) {
poppedVersion = std::max(poppedVersion, c->popped());
}
}
return poppedVersion;
}
ILogSystem::MultiCursor::MultiCursor( std::vector<Reference<IPeekCursor>> cursors, std::vector<LogMessageVersion> epochEnds ) : cursors(cursors), epochEnds(epochEnds), poppedVersion(0) {}
Reference<ILogSystem::IPeekCursor> ILogSystem::MultiCursor::cloneNoMore() {
return cursors.back()->cloneNoMore();
}
void ILogSystem::MultiCursor::setProtocolVersion( uint64_t version ) {
cursors.back()->setProtocolVersion(version);
}
Arena& ILogSystem::MultiCursor::arena() {
return cursors.back()->arena();
}
ArenaReader* ILogSystem::MultiCursor::reader() {
return cursors.back()->reader();
}
bool ILogSystem::MultiCursor::hasMessage() {
return cursors.back()->hasMessage();
}
void ILogSystem::MultiCursor::nextMessage() {
cursors.back()->nextMessage();
}
StringRef ILogSystem::MultiCursor::getMessage() {
return cursors.back()->getMessage();
}
std::vector<Tag> ILogSystem::MultiCursor::getTags() {
return cursors.back()->getTags();
}
void ILogSystem::MultiCursor::advanceTo(LogMessageVersion n) {
while( cursors.size() > 1 && n >= epochEnds.back() ) {
poppedVersion = std::max(poppedVersion, cursors.back()->popped());
cursors.pop_back();
epochEnds.pop_back();
}
cursors.back()->advanceTo(n);
}
Future<Void> ILogSystem::MultiCursor::getMore() {
while( cursors.size() > 1 && cursors.back()->version() >= epochEnds.back() ) {
poppedVersion = std::max(poppedVersion, cursors.back()->popped());
cursors.pop_back();
epochEnds.pop_back();
}
return cursors.back()->getMore();
}
Future<Void> ILogSystem::MultiCursor::onFailed() {
return cursors.back()->onFailed();
}
bool ILogSystem::MultiCursor::isActive() {
return cursors.back()->isActive();
}
LogMessageVersion ILogSystem::MultiCursor::version() {
return cursors.back()->version();
}
Version ILogSystem::MultiCursor::popped() {
return std::max(poppedVersion, cursors.back()->popped());
}
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