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#include "XDiskQueue.h"
#ifndef SPDLOG_ACTIVE_LEVEL
#define SPDLOG_ACTIVE_LEVEL SPDLOG_LEVEL_TRACE
#endif
#include "spdlog/spdlog.h"
#include "leveldb/env.h"
using namespace std;
using namespace vagt::queue;
using namespace leveldb;
constexpr auto XDiskQueueCompactInterval = 1800;
class XDummyLogger : public leveldb::Logger
{
void Logv(const char* format, va_list ap) {}
};
vagt::queue::XDiskQueue::XDiskQueue(const std::string & path):db_(nullptr),it_(nullptr),keyId_(0)
{
compactTime_ = chrono::system_clock::now();
Options opt;
opt.create_if_missing = true;
opt.write_buffer_size = 4 * 1024 * 1024;
opt.max_open_files = 10;
opt.info_log = new XDummyLogger;
opt_.fill_cache = true;
Status status = DB::Open(opt, path, &db_);
if (status.ok() && db_ != nullptr)
{
SPDLOG_INFO("Disk queue is ready.");
return;
}
SPDLOG_INFO("Repairing disk queue.");
status = RepairDB(path, opt);
if (status.ok())
{
status = DB::Open(opt, path.c_str(), &db_);
if (status.ok() && db_ != nullptr)
{
SPDLOG_INFO("Disk queue is ready.");
return;
}
}
SPDLOG_ERROR("Fail to initialize disk queue:{}.", status.ToString());
}
vagt::queue::XDiskQueue::~XDiskQueue()
{
if (it_)
{
delete it_;
it_ = nullptr;
}
if (db_)
{
delete db_;
db_ = nullptr;
}
}
bool vagt::queue::XDiskQueue::empty()
{
if (!it_)
{
it_ = db_->NewIterator(opt_);
it_->SeekToFirst();
if (it_->Valid())
{
return false;
}
else
{
return true;
}
}
if (it_->Valid())
{
return false;
}
delete it_;
it_ = db_->NewIterator(opt_);
it_->SeekToFirst();
if (it_->Valid())
{
return false;
}
else
{
return true;
}
}
XErrorCode vagt::queue::XDiskQueue::push(const std::string & val)
{
auto key = createKey();
SPDLOG_DEBUG("Push {} to disk queue:{}.", val, key);
WriteOptions opt;
opt.sync = false;
auto status = db_->Put(opt, key, val);
if (!status.ok())
{
SPDLOG_ERROR("Fail to push {} to disk queue:{}.", key, status.ToString());
return XErrorNok;
}
return XErrorOk;
}
void vagt::queue::XDiskQueue::pop()
{
if (!it_ || !it_->Valid())
{
SPDLOG_ERROR("Iterator is not valid.");
return;
}
auto delKey = it_->key().ToString();
it_->Next();
WriteOptions wo;
wo.sync = false;
auto status = db_->Delete(wo, delKey);
if (status.ok())
{
SPDLOG_DEBUG("Pop {} from disk queue.", delKey);
tryCompact(delKey);
return;
}
else
{
SPDLOG_ERROR("Fail to pop {} from disk queue:{}.", delKey, status.ToString());
return;
}
}
std::string vagt::queue::XDiskQueue::front()
{
if (it_ && it_->Valid())
{
return it_->value().ToString();
}
SPDLOG_ERROR("Iterator is not valid.");
return "";
}
std::string vagt::queue::XDiskQueue::createKey()
{
auto now = chrono::system_clock::now().time_since_epoch().count();
snprintf(key, sizeof(key), "%020ld_%010ld", now, keyId_.fetch_add(1));
return key;
}
void vagt::queue::XDiskQueue::tryCompact(const std::string & key)
{
if (it_->Valid())
{
return;
}
delete it_;
it_ = nullptr;
auto now = chrono::system_clock::now();
auto duration = chrono::duration_cast<std::chrono::seconds>(now - compactTime_).count();
if (duration > XDiskQueueCompactInterval &&
db_ &&
!key.empty())
{
SPDLOG_INFO("Disk queue compaction starting...");
Slice end(key);
SPDLOG_INFO("Compact key older than {}.", end.ToString());
db_->CompactRange(NULL, &end);
SPDLOG_INFO("Disk queue compaction complete...");
compactTime_ = now;
}
}
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