C++ Transaction类代码示例

// Generate Transactions
//
void gen_rules(TransPar &par)
{
  StringSet *lits;
  StringSetIter *patterns;
  Transaction *trans;
  poisson_distribution<LINT> tlen(par.tlen - 1);

  ofstream data_fp;
  ofstream pat_fp;

  data_fp.open(data_file, ios::trunc);
  pat_fp.open(pat_file, ios::trunc);
  
  lits = new StringSet(par.nitems, par.lits);

  // Reset random seed generator before generating transactions
  if (par.seed < 0) generator.seed(par.seed);

  par.write(pat_fp);
  lits->display(pat_fp);

  patterns = new StringSetIter(*lits);
  for (LINT i = 0; i < par.ntrans; i ++)
    {
      trans = mk_tran(*patterns, tlen(generator) + 1);
      if (par.ascii) 
	trans->write_asc(data_fp);
      else 
	trans->write(data_fp);
      delete trans;
    }
  
  data_fp.close();
  pat_fp.close();
}

bool TransactionQueue::buildQueue(ifstream& transFile) {
    // temporary members to store input for processing
    char act;
    
    int a1, a1t, a2, a2t, amt, tmp;
    a1 = a1t = a2 = a2t = amt = tmp = 0;
    transFile >> act;
    //loop through file
    for (;;) {
        // get action indicator first to guide action
        
        //cout << act << "|";
        // test if valid action, otherwise abort for this line
        if (act == 'D' || act == 'W' || act == 'M' || act == 'H') {
            transFile >> tmp;
            //cout << tmp << "|";
            if (act == 'H') {           // for History, store acct#/type & done
                a1 = tmp;
            } else {                    // all others need at least a first
                a1 = tmp / 10;          // acct#, acct type, and amount
                a1t = tmp % 10;     
                transFile >> amt;
                if (act == 'M') {       // finally, if Move get second
                    transFile >> tmp;   // acct# and acct type                    
                    a2 = tmp / 10;
                    a2t = tmp % 10;
                }
            } 
            // build object and enqueue, then move on to next line
            Transaction* t = new Transaction;
            t->setData(act, a1, a1t, a2, a2t, amt);
            transQueue.push_back(t);
            a1 = a1t = a2 = a2t = amt = tmp = 0;
        } else {

void Bank::Transfer(const Transaction& tr)
{
	Account info;
	Account* from = NULL;
	Account* to = NULL;
	string acc = tr.GetAccount();
	string num = acc.substr(0, acc.length() - 1);
	info.SetNumber(num);

	if (!tree.Retrieve(info, from))
	{
		cerr << "ERROR: Account " << num
			<< " not found. Transferal refused." << endl;
		return;
	}

	string acc2 = tr.GetAccount2();
	string num2 = acc2.substr(0, acc2.length() - 1);
	info.SetNumber(num2);

	if (!tree.Retrieve(info, to))
	{
		cerr << "ERROR: Account " << num2
			<< " not found. Transferal refused." << endl;
		return;
	}

	if (from->Transfer(tr, true))
	{
		to->Transfer(tr, false);
	}
}

int s3fs_chown(const char *path, uid_t uid, gid_t gid) {
#ifdef DEBUG
    syslog(LOG_INFO, "chown[%s] uid[%d] gid[%d]", path, uid, gid);
#endif

    try {
        Transaction t;
        t.getExisting(path);

        // uid or gid < 0 indicates no change
        if ((int) uid >= 0 && t.file->info->uid != uid) {
            t.file->info->uid = uid;
            t.file->dirty_metadata = true;
        }
        if ((int) gid >= 0 && t.file->info->gid != gid) {
            t.file->info->gid = gid;
            t.file->dirty_metadata = true;
        }

        return 0;
    } catch (int e) {
        syslog(LOG_INFO, "chown[%s]: %s", path, strerror(e));
        return e;
    }
}

void Transact::on_debug_clicked()
{
//	Secret s = findSecret(value() + fee());
	Address from = fromAccount();
	auto b = ethereum()->balanceAt(from, PendingBlock);
	if (!from || b < value() + fee())
	{
		QMessageBox::critical(this, "Transaction Failed", "Couldn't make transaction: account doesn't contain at least the required amount.");
		return;
	}

	try
	{
		Block postState(ethereum()->postState());
		Transaction t = isCreation() ?
			Transaction(value(), gasPrice(), gas(), m_data, postState.transactionsFrom(from)) :
			Transaction(value(), gasPrice(), gas(), toAccount().first, m_data, postState.transactionsFrom(from));
		t.forceSender(from);
		Debugger dw(m_main, this);
		Executive e(postState, ethereum()->blockChain(), 0);
		dw.populate(e, t);
		dw.exec();
	}
	catch (dev::Exception const& _e)
	{
		QMessageBox::critical(this, "Transaction Failed", "Couldn't make transaction. Low-level error: " + QString::fromStdString(diagnostic_information(_e)));
		// this output is aimed at developers, reconsider using _e.what for more user friendly output.
	}
}

void MixClient::executeTransaction(Transaction const& _t, Block& _block, bool _call, bool _gasAuto, Secret const& _secret)
{
	Transaction t = _gasAuto ? replaceGas(_t, m_postMine.gasLimitRemaining()) : _t;

	// do debugging run first
	EnvInfo envInfo(bc().info(), bc().lastHashes());
	ExecutionResult d = debugTransaction(t, _block.state(), envInfo, _call);

	// execute on a state
	if (!_call)
	{
		t = _gasAuto ? replaceGas(_t, d.gasUsed, _secret) : _t;
		eth::ExecutionResult const& er = _block.execute(envInfo.lastHashes(), t);
		if (t.isCreation() && _block.state().code(d.contractAddress).empty())
			BOOST_THROW_EXCEPTION(OutOfGas() << errinfo_comment("Not enough gas for contract deployment"));
		d.gasUsed = er.gasUsed + er.gasRefunded + er.gasForDeposit + c_callStipend;
		LocalisedLogEntries logs;
		TransactionReceipt const& tr = _block.receipt(_block.pending().size() - 1);

		LogEntries le = tr.log();
		if (le.size())
			for (unsigned j = 0; j < le.size(); ++j)
				logs.insert(logs.begin(), LocalisedLogEntry(le[j]));
		d.logs =  logs;
	}
	WriteGuard l(x_executions);
	m_executions.emplace_back(std::move(d));
}

int s3fs_rmdir(const char *path) {
#ifdef DEBUG
    syslog(LOG_INFO, "rmdir[%s]", path);
#endif

    try {
        Transaction t;
        t.getExisting(path);

        // sync any deleted files inside this directory
        Filecache::sync();

        // make sure the directory is empty
        std::string marker;
        stringlist entries;
        S3request::get_directory(path, marker, entries, 1);
        if (entries.size() > 0)
            throw -ENOTEMPTY;

        t.file->deleted = true;

        return 0;
    } catch (int e) {
        syslog(LOG_INFO, "rmdir[%s]: %s", path, strerror(e));
        return e;
    }
}

// Generate a transaction
//
Transaction *mk_tran(StringSetIter &lits, // table of patterns
		LINT tlen, // transaction length
		LINT NPATS, Taxonomy *tax)
{
	Transaction *trans;
	StringP pat;

	if (tlen > Transaction::MAXNITEMS)
		tlen = Transaction::MAXNITEMS; //MJZ: can't exceed nitems
	trans = new Transaction(tlen);
	LINT patcnt = 0; //MJZ
	while (trans->size() < tlen && patcnt < NPATS)
	{
		patcnt++;
		//cout << trans->size() << " " << tlen << " HERE2\n";
		pat = lits.get_pat(); // get a pattern
		if (!trans->add(*pat))
		{
			// this pattern didn't fit in the transaction
			lits.unget_pat();
			break;
		}
	}
	return trans;
}

bool Manager::apply()
{
  Transaction *tx = m_reapack->setupTransaction();

  if(!tx)
    return false;

  if(m_autoInstall)
    m_config->install()->autoInstall = m_autoInstall.value();

  if(m_bleedingEdge)
    m_config->install()->bleedingEdge = m_bleedingEdge.value();

  for(const auto &pair : m_enableOverrides) {
    const Remote &remote = pair.first;
    const bool enable = pair.second;

    if(m_uninstall.find(remote) == m_uninstall.end())
      m_reapack->setRemoteEnabled(enable, remote);
  }

  for(const Remote &remote : m_uninstall)
    m_reapack->uninstall(remote);

  tx->runTasks();
  m_config->write();
  reset();

  return true;
}

TEST_F(TestStream, Simple)
{
    Connection c = Connection::create(m_engine);
    Transaction tx = Transaction::create(c);
    ib_stream_pump_t *pump;
    ASSERT_EQ(IB_OK,
              ib_stream_pump_create(&pump, m_reg, tx.ib())
             );
    ASSERT_EQ(IB_OK,
              ib_stream_pump_processor_add(pump, "inflate")
             );
    ASSERT_EQ(IB_OK,
              ib_stream_pump_processor_add(pump, "collector")
             );

    ASSERT_EQ(IB_OK,
              ib_stream_pump_flush(pump)
             );
    ASSERT_EQ(IB_OK,
              ib_stream_pump_process(pump, compressed_data, 3)
             );
    ASSERT_EQ(IB_OK,
              ib_stream_pump_process(pump,
                                     compressed_data + 3,
                                     compressed_data_len - 3)
             );
    ASSERT_EQ(IB_OK,
              ib_stream_pump_flush(pump)
             );
    ASSERT_EQ(0,
              m_collector.compare(0, std::string::npos,
                                  reinterpret_cast<const char*>(uncompressed_data),
                                  uncompressed_data_len));
}

	uid_t YChatDB::addUser(const string& username, const string& password) {
		Storage* uind_store = get_user_index_table();
		Storage* user_store = get_user_table();
		if (uind_store == NULL || user_store == NULL) return 0;
		Transaction txn;
		uid_t uid = 0;
		try {
			if (!inc_and_get_curr_max_uid(uind_store, txn, uid)) {
				txn.abort();
				return 0;
			}
			OctetsStream key, value; 
			key << username, value << password << uid;
			uind_store->insert(key, value, txn);
			
			User user(uid, username);
			OctetsStream key2, value2;
			key2 << uid, value2 << user.toString();
			user_store->insert(key2, value2, txn);
		} catch (...) {
			txn.abort();
			return 0;
		}

		return uid;
	}

void
process_commit() {
	/*
	Loop through all the maps and add to new map in each transaction.
	Once that is done, what we have is the new final transaction.
	Erase trans_stack and add this new final transaction as tid 0
	*/
	vector<Transaction*>::iterator t_stack_it;
	map<string, int> tr_start_varMap;
	map<int,int> tr_start_valMap;
	Transaction *t = new Transaction(0);
	Transaction* tr_start;
	for (t_stack_it = trans_stack.begin(); t_stack_it != trans_stack.end(); ++t_stack_it) {
		tr_start = *t_stack_it;

		// get all varMap and valMapentries from tr_start to t
		tr_start_varMap = tr_start->get_varMap();
		//tr_start_valMap = tr_start->get_valMap();
		t->populate_vmaps(tr_start_varMap);
		
		//clear the copy buffers
		tr_start_valMap.erase(tr_start_valMap.begin(), tr_start_valMap.end());
		tr_start_varMap.erase(tr_start_varMap.begin(), tr_start_varMap.end());

	}

	trans_stack.erase(trans_stack.begin(), trans_stack.end());
	trans_stack.push_back(t);
}

void TransactionHandler::work()
{
    //std::lock_guard<std::mutex> guard(m);
    //m.lock();
    int i = 0;
    while (!mQueue.empty())
    {
        //m.unlock();
        //m.lock();
        Transaction* t = mQueue.front();
        mQueue.pop();
        //m.unlock();
        
        t->call();
        
        //m1.lock();
        //std::cout << std::this_thread::get_id() << ": " << i << std::endl;
        //m1.unlock();
        
        i++;
    }
    //delete t;
    
    //m1.lock();
    //std::cout << "I am " <<  std::this_thread::get_id() << " and I did " << i << " transactions. " << std::endl;
    //m1.unlock();
}

void AspEventHandler::report_topsortedtx() {
	char buff[256];
	assert(ASP_ROOT != NULL);
	sprintf(buff, "%s/asp/analysis/work/%s/%s", ASP_ROOT, test_name_, TRACE_FILE);
	FILE* trace_file = fopen(buff, "w");
	if(!trace_file) {
		printf("Error in opening the trace file /tmp/trace.txt !");
		exit(-1);
	}

	for(TransactionPtrList::iterator itr = txlist_sorted_.begin(); itr != txlist_sorted_.end(); ++itr) {
		Transaction* tx = (*itr);
		fprintf(report_file_, "%s\n", TXID_ToString(tx->txid()).c_str());

		// write to Richard's trace file format
		AccessBasePtrList* accesses = tx->accesses();
		for(AccessBasePtrList::iterator iter = accesses->begin(); iter < accesses->end(); ++iter) {
			AccessBase* access = (*iter);
			if(access->is_array() && access->is_write()) {
				fprintf(trace_file, "_asp_log_write(%s, %d, %s, %.4f)\n",
						access->base_name(), access->offset(), "_my_in_img", access->double_value());
			}
		}
	}

	fclose(trace_file);
}

int s3fs_getattr(const char *path, struct stat *stbuf) {
#ifdef DEBUG
    syslog(LOG_INFO, "getattr[%s]", path);
#endif

    try {
        Transaction t;
        t.getExisting(path);

        if (t.file->deleted)
            throw -ENOENT;

        t.file->info->toStat(stbuf);

        return 0;
    } catch (int e) {
        if (e == -ENOENT) {
            // getattr is used to check if a file exists, so
            // getting a File Not Found error is nothing to worry about
#ifdef DEBUG
            syslog(LOG_INFO, "getattr[%s]: File not found", path);
#endif
        } else {
            syslog(LOG_INFO, "getattr[%s]: %s", path, strerror(e));
        }
        return e;
    }
}