C++ LogEntry::UnRef方法代码示例

bool LogManager::Truncate(uint64_t index,uint64_t term){
	abb::Mutex::Locker l(mtx_);
	LOG(TRACE) << "log.truncate: " <<  index;
	if(index < this->commit_index_){
		LOG(DEBUG) << "log.truncate.before";
		return false;
	}
	if(index > (log_entry_arr_.size() + start_index_)){
		LOG(DEBUG) << "log.truncate.after" << index << ":"<< log_entry_arr_.size() << "+" << start_index_ << "commit_index:" << commit_index_;
		return false;
	}
	if(index == this->start_index_){
		lseek(fd_,0, SEEK_SET);
		ftruncate(fd_,0);
		for(unsigned st=0;st < this->log_entry_arr_.size() ;st++){
			LogEntry* entry = log_entry_arr_[st];
			if(entry->ev_){
				if(entry->ev_){
					entry->ev_->Notify(NULL,"command failed to be committed due to node failure");
					entry->ev_->UnRef();
					entry->ev_ = NULL;
				}
				entry->UnRef();
			}
		}
		this->log_entry_arr_.clear();
	}else{
		if(index < (this->start_index_+this->log_entry_arr_.size()) ){
			int st = index - this->start_index_ -1;
			LogEntry* entry = this->log_entry_arr_[st];
			if (this->log_entry_arr_.size()> 0 && entry->term_ != term ){
				LOG(DEBUG) << "log.truncate.termMismatch";
				return false;
			}else{
				int start = index - this->start_index_;
				LogEntry* entry = this->log_entry_arr_[start];
				ftruncate(fd_,entry->position);
				lseek(fd_,entry->position, SEEK_SET);
				for(int i=start;i < (int)this->log_entry_arr_.size();i++){
					LogEntry* inentry = this->log_entry_arr_[i];
					if(inentry){
						if(inentry->ev_){
							inentry->ev_->Notify(NULL,"command failed to be committed due to node failure");
							inentry->ev_->UnRef();
							inentry->ev_ = NULL;
						}
						inentry->UnRef();
					}
				}
				this->log_entry_arr_.erase(this->log_entry_arr_.begin()+start,this->log_entry_arr_.end());
				LOG(DEBUG) << "log.truncate.success" << this->start_index_  << "/" << this->log_entry_arr_.size();
			}
		}
	}
	return true;
}

bool LogManager::Open(const std::string& path){
	path_ = path;
	abb::Mutex::Locker l(mtx_);
	fd_ = open(path.c_str(),O_RDWR,0600);
	if(fd_ < 0){
		LOG(WARN)<< "raft.open.file.failed:"<<path<< " err:" <<errno<<" errstr:" << strerror(errno);
		fd_ = open(path.c_str(),O_RDWR|O_CREAT,0600);
		if(fd_ < 0){
			LOG(WARN)<< "raft.create.file.failed:"<<path<< " err:" <<errno<<" errstr:" << strerror(errno);
			return false;
		}
		LOG(DEBUG)<< "log.open.create " << path;
		return true;
	}
	fcntl(fd_, F_SETFD, FD_CLOEXEC);
	LOG(DEBUG)<< "log.open.exist " << path;
	lseek(fd_,0,SEEK_SET);
	abb::Buffer buf;
	while( buf.WriteFromeReader(StaticReader,this) > 0){
		;
	}
	int position = 0;
	int size = buf.ReadSize();
	while(size > 0){
		LogEntry* entry = new LogEntry();
		if( ! entry->Decode(buf) ) {
			entry->UnRef();
			return false;
		}

		entry->position = position;
		if(entry->index_ > this->start_index_){
			entry->Ref();
			this->log_entry_arr_.push_back(entry);
			if(entry->index_ <= this->commit_index_){
				entry->cmd_->Apply(this->svr_,NULL,NULL);
			}
		}
		position += size - buf.ReadSize();
		entry->UnRef();
		size = buf.ReadSize();
	}
	if(this->log_entry_arr_.size() > 0){
		LOG(DEBUG) << "open.log.append log index " << this->log_entry_arr_.front()->index_ << ":" <<this->log_entry_arr_.back()->index_ << "  " << this->commit_index_;
	}
	
	return true;
}

bool LogManager::CommitToIndex(uint64_t index){
	LogEntryArray arr;
	{
		LOG(TRACE) << "CommitToIndex" << index;
		abb::Mutex::Locker l(mtx_);
		if(index > (log_entry_arr_.size() + start_index_)){
			LOG(DEBUG) << "raft.Log: Commit index" << index << "set back to " << ( log_entry_arr_.size() + start_index_);
			index = log_entry_arr_.size() + start_index_;
		}
		if (index < commit_index_) {
			LOG(DEBUG) << "raft.Log: Commit index earily :" << index << "commit_index_:" << commit_index_;
			return true;
		}
		for(unsigned i= this->commit_index_+1;i<=index;i++){
			int e_index = i - 1 - this->start_index_;
			LogEntry* entry = log_entry_arr_[e_index];
			this->commit_index_ = entry->index_;
			entry->Ref();
			arr.push_back(entry);
		}
	}
	for(unsigned i = 0;i< arr.size();i++){
		LogEntry* entry = arr[i];
		if(entry->ev_){
			IMessage* msg = NULL;
			std::string error ;
			entry->cmd_->Apply(this->svr_,&error,&msg);
			entry->ev_->Notify(msg,error);
			entry->ev_->UnRef();
			entry->ev_ = NULL;
		}else{
			entry->cmd_->Apply(this->svr_,NULL,NULL);
		}
		entry->UnRef();
	}
	return true;
}